Merge pull request #198 from propeller-heads/audit/dc/one-transfer-from-only

feat: Restrict transferFrom

Cargo.lock

@@ -4445,9 +4445,9 @@ checksum = "e421abadd41a4225275504ea4d6566923418b7f05506fbc9c0fe86ba7396114b"
 
 [[package]]
 name = "tycho-common"
-version = "0.66.4"
+version = "0.70.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5131fdb21cbd754822b0947fc6c763494531837ba8bb34123f6c7f4f89cb69f7"
+checksum = "5237d0e4ab6979a1ca9cdb749a2a97240ca6dc716c0da6f42543960d3141255a"
 dependencies = [
  "anyhow",
  "async-trait",

Cargo.toml

@@ -32,7 +32,7 @@ clap = { version = "4.5.3", features = ["derive"] }
 alloy = { version = "0.9.2", features = ["providers", "rpc-types-eth", "eip712", "signer-local"], optional = true }
 alloy-sol-types = { version = "0.8.14", optional = true }
 alloy-primitives = { version = "0.8.9", optional = true }
-tycho-common = "^0.66.4"
+tycho-common = ">0.66.4"
 once_cell = "1.20.2"
 
 [dev-dependencies]

foundry/src/Dispatcher.sol

@@ -10,7 +10,6 @@ error Dispatcher__InvalidDataLength();
 
 /**
  * @title Dispatcher - Dispatch execution to external contracts
- * @author PropellerHeads Devs
  * @dev Provides the ability to delegate execution of swaps to external
  *  contracts. This allows dynamically adding new supported protocols
  *  without needing to upgrade any contracts. External contracts will

foundry/src/RestrictTransferFrom.sol

@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: BUSL-1.1
+pragma solidity ^0.8.26;
+
+import "@interfaces/IExecutor.sol";
+import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import "@permit2/src/interfaces/IAllowanceTransfer.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
+
+error RestrictTransferFrom__AddressZero();
+error RestrictTransferFrom__ExceededTransferFromAllowance(
+    uint256 allowedAmount, uint256 amountAttempted
+);
+error RestrictTransferFrom__UnknownTransferType();
+
+/**
+ * @title RestrictTransferFrom - Restrict transferFrom upto allowed amount of token
+ * @dev Restricts to one `transferFrom` (using `permit2` or regular `transferFrom`)
+ * per swap, while ensuring that the `transferFrom` is only performed on the input
+ * token upto input amount, from the msg.sender's wallet that calls the main swap
+ * method. Reverts if `transferFrom`s are attempted above this allowed amount.
+ */
+contract RestrictTransferFrom {
+    using SafeERC20 for IERC20;
+
+    IAllowanceTransfer public immutable permit2;
+    // keccak256("Dispatcher#TOKEN_IN_SLOT")
+    uint256 private constant _TOKEN_IN_SLOT =
+        0x66f353cfe8e3cbe0d03292348fbf0fca32e6e07fa0c2a52b4aac22193ac3b894;
+    // keccak256("Dispatcher#AMOUNT_ALLOWED_SLOT")
+    uint256 private constant _AMOUNT_ALLOWED_SLOT =
+        0xc76591aca92830b1554f3dcc7893e7519ec7c57bd4e64fec0c546d9078033291;
+    // keccak256("Dispatcher#IS_PERMIT2_SLOT")
+    uint256 private constant _IS_PERMIT2_SLOT =
+        0x3162c9d1175ca0ca7441f87984fdac41bbfdb13246f42c8bb4414d345da39e2a;
+    // keccak256("Dispatcher#SENDER_SLOT")
+    uint256 private constant _SENDER_SLOT =
+        0x5dcc7974be5cb30f183f878073999aaa6620995b9e052ab5a713071ff60ae9b5;
+    // keccak256("Dispatcher#AMOUNT_SPENT_SLOT")
+    uint256 private constant _AMOUNT_SPENT_SLOT =
+        0x56044a5eb3aa5bd3ad908b7f15d1e8cb830836bb4ad178a0bf08955c94c40d30;
+
+    constructor(address _permit2) {
+        if (_permit2 == address(0)) {
+            revert RestrictTransferFrom__AddressZero();
+        }
+        permit2 = IAllowanceTransfer(_permit2);
+    }
+
+    enum TransferType {
+        TransferFrom,
+        Transfer,
+        None
+    }
+
+    /**
+     * @dev This function is used to store the transfer information in the
+     * contract's storage. This is done as the first step in the swap process in TychoRouter.
+     */
+    // slither-disable-next-line assembly
+    function _tstoreTransferFromInfo(
+        address tokenIn,
+        uint256 amountIn,
+        bool isPermit2,
+        bool transferFromNeeded
+    ) internal {
+        uint256 amountAllowed = amountIn;
+        if (!transferFromNeeded) {
+            amountAllowed = 0;
+        }
+        assembly {
+            tstore(_TOKEN_IN_SLOT, tokenIn)
+            tstore(_AMOUNT_ALLOWED_SLOT, amountAllowed)
+            tstore(_IS_PERMIT2_SLOT, isPermit2)
+            tstore(_SENDER_SLOT, caller())
+            tstore(_AMOUNT_SPENT_SLOT, 0)
+        }
+    }
+
+    /**
+     * @dev This function is used to transfer the tokens from the sender to the receiver.
+     * This function is called within the Executor contracts.
+     * If the TransferType is TransferFrom, it will check if the amount is within the allowed amount and transfer those funds from the user.
+     * If the TransferType is Transfer, it will transfer the funds from the TychoRouter to the receiver.
+     * If the TransferType is None, it will do nothing.
+     */
+    // slither-disable-next-line assembly
+    function _transfer(
+        address receiver,
+        TransferType transferType,
+        address tokenIn,
+        uint256 amount
+    ) internal {
+        if (transferType == TransferType.TransferFrom) {
+            bool isPermit2;
+            address sender;
+            uint256 amountSpent;
+            uint256 amountAllowed;
+            assembly {
+                tokenIn := tload(_TOKEN_IN_SLOT)
+                amountAllowed := tload(_AMOUNT_ALLOWED_SLOT)
+                isPermit2 := tload(_IS_PERMIT2_SLOT)
+                sender := tload(_SENDER_SLOT)
+                amountSpent := tload(_AMOUNT_SPENT_SLOT)
+            }
+            uint256 amountAttempted = amountSpent + amount;
+            if (amountAttempted > amountAllowed) {
+                revert RestrictTransferFrom__ExceededTransferFromAllowance(
+                    amountAllowed, amountAttempted
+                );
+            }
+            assembly {
+                tstore(_AMOUNT_SPENT_SLOT, amountAttempted)
+            }
+            if (isPermit2) {
+                // Permit2.permit is already called from the TychoRouter
+                permit2.transferFrom(sender, receiver, uint160(amount), tokenIn);
+            } else {
+                // slither-disable-next-line arbitrary-send-erc20
+                IERC20(tokenIn).safeTransferFrom(sender, receiver, amount);
+            }
+        } else if (transferType == TransferType.Transfer) {
+            if (tokenIn == address(0)) {
+                Address.sendValue(payable(receiver), amount);
+            } else {
+                IERC20(tokenIn).safeTransfer(receiver, amount);
+            }
+        } else if (transferType == TransferType.None) {
+            return;
+        } else {
+            revert RestrictTransferFrom__UnknownTransferType();
+        }
+    }
+}

foundry/src/TychoRouter.sol

@@ -14,6 +14,7 @@ import "@permit2/src/interfaces/IAllowanceTransfer.sol";
 import "./Dispatcher.sol";
 import {LibSwap} from "../lib/LibSwap.sol";
 import {IPoolManager} from "@uniswap/v4-core/src/interfaces/IPoolManager.sol";
+import {RestrictTransferFrom} from "./RestrictTransferFrom.sol";
 
 //                                         ✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷
 //                                   ✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷✷
@@ -65,8 +66,13 @@ error TychoRouter__MessageValueMismatch(uint256 value, uint256 amount);
 error TychoRouter__InvalidDataLength();
 error TychoRouter__UndefinedMinAmountOut();
 
-contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
+contract TychoRouter is
-    IAllowanceTransfer public immutable permit2;
+    AccessControl,
+    Dispatcher,
+    Pausable,
+    ReentrancyGuard,
+    RestrictTransferFrom
+{
     IWETH private immutable _weth;
 
     using SafeERC20 for IERC20;
@@ -87,7 +93,9 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         address indexed token, uint256 amount, address indexed receiver
     );
 
-    constructor(address _permit2, address weth) {
+    constructor(address _permit2, address weth)
+        RestrictTransferFrom(_permit2)
+    {
         if (_permit2 == address(0) || weth == address(0)) {
             revert TychoRouter__AddressZero();
         }
@@ -115,6 +123,7 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
      * @param unwrapEth If true, unwraps the resulting WETH into native ETH and sends it to the receiver.
      * @param nTokens The total number of tokens involved in the swap graph (used to initialize arrays for internal calculations).
      * @param receiver The address to receive the output tokens.
+     * @param transferFromNeeded If false, the contract will assume that the input token is already transferred to the contract and don't allow any transferFroms
      * @param swaps Encoded swap graph data containing details of each swap.
      *
      * @return amountOut The total amount of the output token received by the receiver.
@@ -128,13 +137,18 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         bool unwrapEth,
         uint256 nTokens,
         address receiver,
+        bool transferFromNeeded,
         bytes calldata swaps
     ) public payable whenNotPaused nonReentrant returns (uint256 amountOut) {
+        uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
+        _tstoreTransferFromInfo(tokenIn, amountIn, false, transferFromNeeded);
+
         return _splitSwapChecked(
             amountIn,
             tokenIn,
             tokenOut,
             minAmountOut,
+            initialBalanceTokenOut,
             wrapEth,
             unwrapEth,
             nTokens,
@@ -182,16 +196,19 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         bytes calldata signature,
         bytes calldata swaps
     ) external payable whenNotPaused nonReentrant returns (uint256 amountOut) {
+        uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
         // For native ETH, assume funds already in our router. Else, handle approval.
         if (tokenIn != address(0)) {
             permit2.permit(msg.sender, permitSingle, signature);
         }
+        _tstoreTransferFromInfo(tokenIn, amountIn, true, true);
 
         return _splitSwapChecked(
             amountIn,
             tokenIn,
             tokenOut,
             minAmountOut,
+            initialBalanceTokenOut,
             wrapEth,
             unwrapEth,
             nTokens,
@@ -218,6 +235,7 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
      * @param wrapEth If true, wraps the input token (native ETH) into WETH.
      * @param unwrapEth If true, unwraps the resulting WETH into native ETH and sends it to the receiver.
      * @param receiver The address to receive the output tokens.
+     * @param transferFromNeeded If false, the contract will assume that the input token is already transferred to the contract and don't allow any transferFroms
      * @param swaps Encoded swap graph data containing details of each swap.
      *
      * @return amountOut The total amount of the output token received by the receiver.
@@ -230,13 +248,18 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         bool wrapEth,
         bool unwrapEth,
         address receiver,
+        bool transferFromNeeded,
         bytes calldata swaps
     ) public payable whenNotPaused nonReentrant returns (uint256 amountOut) {
+        uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
+        _tstoreTransferFromInfo(tokenIn, amountIn, false, transferFromNeeded);
+
         return _sequentialSwapChecked(
             amountIn,
             tokenIn,
             tokenOut,
             minAmountOut,
+            initialBalanceTokenOut,
             wrapEth,
             unwrapEth,
             receiver,
@@ -280,16 +303,20 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         bytes calldata signature,
         bytes calldata swaps
     ) external payable whenNotPaused nonReentrant returns (uint256 amountOut) {
+        uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
         // For native ETH, assume funds already in our router. Else, handle approval.
         if (tokenIn != address(0)) {
             permit2.permit(msg.sender, permitSingle, signature);
         }
 
+        _tstoreTransferFromInfo(tokenIn, amountIn, true, true);
+
         return _sequentialSwapChecked(
             amountIn,
             tokenIn,
             tokenOut,
             minAmountOut,
+            initialBalanceTokenOut,
             wrapEth,
             unwrapEth,
             receiver,
@@ -313,6 +340,7 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
      * @param wrapEth If true, wraps the input token (native ETH) into WETH.
      * @param unwrapEth If true, unwraps the resulting WETH into native ETH and sends it to the receiver.
      * @param receiver The address to receive the output tokens.
+     * @param transferFromNeeded If false, the contract will assume that the input token is already transferred to the contract and don't allow any transferFroms
      * @param swapData Encoded swap details.
      *
      * @return amountOut The total amount of the output token received by the receiver.
@@ -325,13 +353,18 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         bool wrapEth,
         bool unwrapEth,
         address receiver,
+        bool transferFromNeeded,
         bytes calldata swapData
     ) public payable whenNotPaused nonReentrant returns (uint256 amountOut) {
+        uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
+        _tstoreTransferFromInfo(tokenIn, amountIn, false, transferFromNeeded);
+
         return _singleSwap(
             amountIn,
             tokenIn,
             tokenOut,
             minAmountOut,
+            initialBalanceTokenOut,
             wrapEth,
             unwrapEth,
             receiver,
@@ -375,16 +408,19 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         bytes calldata signature,
         bytes calldata swapData
     ) external payable whenNotPaused nonReentrant returns (uint256 amountOut) {
+        uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
         // For native ETH, assume funds already in our router. Else, handle approval.
         if (tokenIn != address(0)) {
             permit2.permit(msg.sender, permitSingle, signature);
         }
+        _tstoreTransferFromInfo(tokenIn, amountIn, true, true);
 
         return _singleSwap(
             amountIn,
             tokenIn,
             tokenOut,
             minAmountOut,
+            initialBalanceTokenOut,
             wrapEth,
             unwrapEth,
             receiver,
@@ -405,6 +441,7 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         address tokenIn,
         address tokenOut,
         uint256 minAmountOut,
+        uint256 initialBalanceTokenOut,
         bool wrapEth,
         bool unwrapEth,
         uint256 nTokens,
@@ -424,7 +461,6 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
             tokenIn = address(_weth);
         }
 
-        uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
         amountOut = _splitSwap(amountIn, nTokens, swaps);
 
         if (amountOut < minAmountOut) {
@@ -459,6 +495,7 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         address tokenIn,
         address tokenOut,
         uint256 minAmountOut,
+        uint256 initialBalanceTokenOut,
         bool wrapEth,
         bool unwrapEth,
         address receiver,
@@ -480,7 +517,6 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         (address executor, bytes calldata protocolData) =
             swap_.decodeSingleSwap();
 
-        uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
         amountOut = _callSwapOnExecutor(executor, amountIn, protocolData);
 
         if (amountOut < minAmountOut) {
@@ -515,6 +551,7 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
         address tokenIn,
         address tokenOut,
         uint256 minAmountOut,
+        uint256 initialBalanceTokenOut,
         bool wrapEth,
         bool unwrapEth,
         address receiver,
@@ -533,7 +570,6 @@ contract TychoRouter is AccessControl, Dispatcher, Pausable, ReentrancyGuard {
             tokenIn = address(_weth);
         }
 
-        uint256 initialBalanceTokenOut = _balanceOf(tokenOut, receiver);
         amountOut = _sequentialSwap(amountIn, swaps);
 
         if (amountOut < minAmountOut) {

foundry/src/executors/BalancerV2Executor.sol

@@ -10,16 +10,16 @@ import {
 import {IAsset} from "@balancer-labs/v2-interfaces/contracts/vault/IAsset.sol";
 // slither-disable-next-line solc-version
 import {IVault} from "@balancer-labs/v2-interfaces/contracts/vault/IVault.sol";
-import {TokenTransfer} from "./TokenTransfer.sol";
+import {RestrictTransferFrom} from "../RestrictTransferFrom.sol";
 
 error BalancerV2Executor__InvalidDataLength();
 
-contract BalancerV2Executor is IExecutor, TokenTransfer {
+contract BalancerV2Executor is IExecutor, RestrictTransferFrom {
     using SafeERC20 for IERC20;
 
     address private constant VAULT = 0xBA12222222228d8Ba445958a75a0704d566BF2C8;
 
-    constructor(address _permit2) TokenTransfer(_permit2) {}
+    constructor(address _permit2) RestrictTransferFrom(_permit2) {}
 
     // slither-disable-next-line locked-ether
     function swap(uint256 givenAmount, bytes calldata data)
@@ -32,21 +32,13 @@ contract BalancerV2Executor is IExecutor, TokenTransfer {
             IERC20 tokenOut,
             bytes32 poolId,
             address receiver,
-            bool needsApproval,
+            bool approvalNeeded,
             TransferType transferType
         ) = _decodeData(data);
 
-        _transfer(
+        _transfer(address(this), transferType, address(tokenIn), givenAmount);
-            address(tokenIn),
-            msg.sender,
-            // Receiver can never be the pool, since the pool expects funds in the router contract
-            // Thus, this call will only ever be used to transfer funds from the user into the router.
-            address(this),
-            givenAmount,
-            transferType
-        );
 
-        if (needsApproval) {
+        if (approvalNeeded) {
             // slither-disable-next-line unused-return
             tokenIn.forceApprove(VAULT, type(uint256).max);
         }
@@ -81,7 +73,7 @@ contract BalancerV2Executor is IExecutor, TokenTransfer {
             IERC20 tokenOut,
             bytes32 poolId,
             address receiver,
-            bool needsApproval,
+            bool approvalNeeded,
             TransferType transferType
         )
     {
@@ -93,7 +85,7 @@ contract BalancerV2Executor is IExecutor, TokenTransfer {
         tokenOut = IERC20(address(bytes20(data[20:40])));
         poolId = bytes32(data[40:72]);
         receiver = address(bytes20(data[72:92]));
-        needsApproval = uint8(data[92]) > 0;
+        approvalNeeded = data[92] != 0;
         transferType = TransferType(uint8(data[93]));
     }
 }

foundry/src/executors/CurveExecutor.sol

@@ -3,8 +3,8 @@ pragma solidity ^0.8.26;
 
 import "@interfaces/IExecutor.sol";
 import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
-import "./TokenTransfer.sol";
 import "@openzeppelin/contracts/utils/Address.sol";
+import {RestrictTransferFrom} from "../RestrictTransferFrom.sol";
 
 error CurveExecutor__AddressZero();
 error CurveExecutor__InvalidDataLength();
@@ -35,13 +35,13 @@ interface CryptoPoolETH {
     // slither-disable-end naming-convention
 }
 
-contract CurveExecutor is IExecutor, TokenTransfer {
+contract CurveExecutor is IExecutor, RestrictTransferFrom {
     using SafeERC20 for IERC20;
 
     address public immutable nativeToken;
 
     constructor(address _nativeToken, address _permit2)
-        TokenTransfer(_permit2)
+        RestrictTransferFrom(_permit2)
     {
         if (_nativeToken == address(0)) {
             revert CurveExecutor__AddressZero();
@@ -64,25 +64,16 @@ contract CurveExecutor is IExecutor, TokenTransfer {
             uint8 poolType,
             int128 i,
             int128 j,
-            bool tokenApprovalNeeded,
+            bool approvalNeeded,
             TransferType transferType,
             address receiver
         ) = _decodeData(data);
 
-        _transfer(
+        if (approvalNeeded && tokenIn != nativeToken) {
-            tokenIn,
-            msg.sender,
-            // Receiver can never be the pool, since the pool expects funds in the router contract
-            // Thus, this call will only ever be used to transfer funds from the user into the router.
-            address(this),
-            amountIn,
-            transferType
-        );
-
-        if (tokenApprovalNeeded && tokenIn != nativeToken) {
             // slither-disable-next-line unused-return
             IERC20(tokenIn).forceApprove(address(pool), type(uint256).max);
         }
+        _transfer(address(this), transferType, tokenIn, amountIn);
 
         /// Inspired by Curve's router contract: https://github.com/curvefi/curve-router-ng/blob/9ab006ca848fc7f1995b6fbbecfecc1e0eb29e2a/contracts/Router.vy#L44
         uint256 balanceBefore = _balanceOf(tokenOut);
@@ -133,7 +124,7 @@ contract CurveExecutor is IExecutor, TokenTransfer {
             uint8 poolType,
             int128 i,
             int128 j,
-            bool tokenApprovalNeeded,
+            bool approvalNeeded,
             TransferType transferType,
             address receiver
         )
@@ -144,7 +135,7 @@ contract CurveExecutor is IExecutor, TokenTransfer {
         poolType = uint8(data[60]);
         i = int128(uint128(uint8(data[61])));
         j = int128(uint128(uint8(data[62])));
-        tokenApprovalNeeded = data[63] != 0;
+        approvalNeeded = data[63] != 0;
         transferType = TransferType(uint8(data[64]));
         receiver = address(bytes20(data[65:85]));
     }

foundry/src/executors/EkuboExecutor.sol

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: UNLICENSED
 pragma solidity ^0.8.26;
 
-import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
 import {IExecutor} from "@interfaces/IExecutor.sol";
 import {ICallback} from "@interfaces/ICallback.sol";
 import {ICore} from "@ekubo/interfaces/ICore.sol";
@@ -11,14 +11,15 @@ import {SafeTransferLib} from "@solady/utils/SafeTransferLib.sol";
 import {LibBytes} from "@solady/utils/LibBytes.sol";
 import {Config, EkuboPoolKey} from "@ekubo/types/poolKey.sol";
 import {MAX_SQRT_RATIO, MIN_SQRT_RATIO} from "@ekubo/types/sqrtRatio.sol";
-import {TokenTransfer} from "./TokenTransfer.sol";
+import {RestrictTransferFrom} from "../RestrictTransferFrom.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
 
 contract EkuboExecutor is
     IExecutor,
     ILocker,
     IPayer,
     ICallback,
-    TokenTransfer
+    RestrictTransferFrom
 {
     error EkuboExecutor__InvalidDataLength();
     error EkuboExecutor__CoreOnly();
@@ -26,13 +27,17 @@ contract EkuboExecutor is
 
     ICore immutable core;
 
-    uint256 constant POOL_DATA_OFFSET = 77;
+    uint256 constant POOL_DATA_OFFSET = 57;
     uint256 constant HOP_BYTE_LEN = 52;
 
     bytes4 constant LOCKED_SELECTOR = 0xb45a3c0e; // locked(uint256)
     bytes4 constant PAY_CALLBACK_SELECTOR = 0x599d0714; // payCallback(uint256,address)
 
-    constructor(address _core, address _permit2) TokenTransfer(_permit2) {
+    using SafeERC20 for IERC20;
+
+    constructor(address _core, address _permit2)
+        RestrictTransferFrom(_permit2)
+    {
         core = ICore(_core);
     }
 
@@ -41,16 +46,11 @@ contract EkuboExecutor is
         payable
         returns (uint256 calculatedAmount)
     {
-        if (data.length < 93) revert EkuboExecutor__InvalidDataLength();
+        if (data.length < 92) revert EkuboExecutor__InvalidDataLength();
 
         // amountIn must be at most type(int128).MAX
-        calculatedAmount = uint256(
+        calculatedAmount =
-            _lock(
+            uint256(_lock(bytes.concat(bytes16(uint128(amountIn)), data)));
-                bytes.concat(
-                    bytes16(uint128(amountIn)), bytes20(msg.sender), data
-                )
-            )
-        );
     }
 
     function handleCallback(bytes calldata raw)
@@ -125,11 +125,9 @@ contract EkuboExecutor is
     function _locked(bytes calldata swapData) internal returns (int128) {
         int128 nextAmountIn = int128(uint128(bytes16(swapData[0:16])));
         uint128 tokenInDebtAmount = uint128(nextAmountIn);
-        address sender = address(bytes20(swapData[16:36]));
+        TransferType transferType = TransferType(uint8(swapData[16]));
-        uint8 transferType = uint8(swapData[36]);
+        address receiver = address(bytes20(swapData[17:37]));
-
+        address tokenIn = address(bytes20(swapData[37:57]));
-        address receiver = address(bytes20(swapData[37:57]));
-        address tokenIn = address(bytes20(swapData[57:77]));
 
         address nextTokenIn = tokenIn;
 
@@ -163,17 +161,14 @@ contract EkuboExecutor is
             offset += HOP_BYTE_LEN;
         }
 
-        _pay(tokenIn, tokenInDebtAmount, sender, transferType);
+        _pay(tokenIn, tokenInDebtAmount, transferType);
         core.withdraw(nextTokenIn, receiver, uint128(nextAmountIn));
         return nextAmountIn;
     }
 
-    function _pay(
+    function _pay(address token, uint128 amount, TransferType transferType)
-        address token,
+        internal
-        uint128 amount,
+    {
-        address sender,
-        uint8 transferType
-    ) internal {
         address target = address(core);
 
         if (token == NATIVE_TOKEN_ADDRESS) {
@@ -186,11 +181,10 @@ contract EkuboExecutor is
                 mstore(free, shl(224, 0x0c11dedd))
                 mstore(add(free, 4), token)
                 mstore(add(free, 36), shl(128, amount))
-                mstore(add(free, 52), shl(96, sender))
+                mstore(add(free, 52), shl(248, transferType))
-                mstore(add(free, 72), shl(248, transferType))
 
-                // 4 (selector) + 32 (token) + 16 (amount) + 20 (sender) + 1 (transferType) = 73
+                // 4 (selector) + 32 (token) + 16 (amount) + 1 (transferType) = 53
-                if iszero(call(gas(), target, 0, free, 73, 0, 0)) {
+                if iszero(call(gas(), target, 0, free, 53, 0, 0)) {
                     returndatacopy(0, 0, returndatasize())
                     revert(0, returndatasize())
                 }
@@ -201,9 +195,8 @@ contract EkuboExecutor is
     function _payCallback(bytes calldata payData) internal {
         address token = address(bytes20(payData[12:32])); // This arg is abi-encoded
         uint128 amount = uint128(bytes16(payData[32:48]));
-        address sender = address(bytes20(payData[48:68]));
+        TransferType transferType = TransferType(uint8(payData[48]));
-        TransferType transferType = TransferType(uint8(payData[68]));
+        _transfer(address(core), transferType, token, amount);
-        _transfer(token, sender, address(core), amount, transferType);
     }
 
     // To receive withdrawals from Core

foundry/src/executors/MaverickV2Executor.sol

@@ -3,18 +3,21 @@ pragma solidity ^0.8.26;
 
 import "@interfaces/IExecutor.sol";
 import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
-import "./TokenTransfer.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
+import {RestrictTransferFrom} from "../RestrictTransferFrom.sol";
 
 error MaverickV2Executor__InvalidDataLength();
 error MaverickV2Executor__InvalidTarget();
 error MaverickV2Executor__InvalidFactory();
 
-contract MaverickV2Executor is IExecutor, TokenTransfer {
+contract MaverickV2Executor is IExecutor, RestrictTransferFrom {
     using SafeERC20 for IERC20;
 
     address public immutable factory;
 
-    constructor(address _factory, address _permit2) TokenTransfer(_permit2) {
+    constructor(address _factory, address _permit2)
+        RestrictTransferFrom(_permit2)
+    {
         if (_factory == address(0)) {
             revert MaverickV2Executor__InvalidFactory();
         }
@@ -47,9 +50,8 @@ contract MaverickV2Executor is IExecutor, TokenTransfer {
             tickLimit: tickLimit
         });
 
-        _transfer(
+        _transfer(target, transferType, address(tokenIn), givenAmount);
-            address(tokenIn), msg.sender, target, givenAmount, transferType
+
-        );
         // slither-disable-next-line unused-return
         (, calculatedAmount) = pool.swap(receiver, swapParams, "");
     }

foundry/src/executors/TokenTransfer.sol

@@ -1,75 +0,0 @@
-// SPDX-License-Identifier: BUSL-1.1
-pragma solidity ^0.8.26;
-
-import "@interfaces/IExecutor.sol";
-import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
-import "@permit2/src/interfaces/IAllowanceTransfer.sol";
-
-error TokenTransfer__AddressZero();
-error TokenTransfer__InvalidTransferType();
-
-contract TokenTransfer {
-    using SafeERC20 for IERC20;
-
-    IAllowanceTransfer public immutable permit2;
-
-    enum TransferType {
-        // Assume funds are in the TychoRouter - transfer into the pool
-        TRANSFER_TO_PROTOCOL,
-        // Assume funds are in msg.sender's wallet - transferFrom into the pool
-        TRANSFER_FROM_TO_PROTOCOL,
-        // Assume funds are in msg.sender's wallet - permit2TransferFrom into the pool
-        TRANSFER_PERMIT2_TO_PROTOCOL,
-        // Assume funds are in msg.sender's wallet - but the pool requires it to be
-        // in the router contract when calling swap - transferFrom into the router
-        // contract
-        TRANSFER_FROM_TO_ROUTER,
-        // Assume funds are in msg.sender's wallet - but the pool requires it to be
-        // in the router contract when calling swap - transferFrom into the router
-        // contract using permit2
-        TRANSFER_PERMIT2_TO_ROUTER,
-        // Assume funds have already been transferred into the pool. Do nothing.
-        NONE
-    }
-
-    constructor(address _permit2) {
-        if (_permit2 == address(0)) {
-            revert TokenTransfer__AddressZero();
-        }
-        permit2 = IAllowanceTransfer(_permit2);
-    }
-
-    function _transfer(
-        address tokenIn,
-        address sender,
-        address receiver,
-        uint256 amount,
-        TransferType transferType
-    ) internal {
-        if (transferType == TransferType.NONE) {
-            return;
-        } else if (transferType == TransferType.TRANSFER_TO_PROTOCOL) {
-            if (tokenIn == address(0)) {
-                payable(receiver).transfer(amount);
-            } else {
-                IERC20(tokenIn).safeTransfer(receiver, amount);
-            }
-        } else if (transferType == TransferType.TRANSFER_FROM_TO_PROTOCOL) {
-            // slither-disable-next-line arbitrary-send-erc20
-            IERC20(tokenIn).safeTransferFrom(sender, receiver, amount);
-        } else if (transferType == TransferType.TRANSFER_PERMIT2_TO_PROTOCOL) {
-            // Permit2.permit is already called from the TychoRouter
-            permit2.transferFrom(sender, receiver, uint160(amount), tokenIn);
-        } else if (transferType == TransferType.TRANSFER_FROM_TO_ROUTER) {
-            // slither-disable-next-line arbitrary-send-erc20
-            IERC20(tokenIn).safeTransferFrom(sender, address(this), amount);
-        } else if (transferType == TransferType.TRANSFER_PERMIT2_TO_ROUTER) {
-            // Permit2.permit is already called from the TychoRouter
-            permit2.transferFrom(
-                sender, address(this), uint160(amount), tokenIn
-            );
-        } else {
-            revert TokenTransfer__InvalidTransferType();
-        }
-    }
-}

foundry/src/executors/UniswapV2Executor.sol

@@ -4,7 +4,7 @@ pragma solidity ^0.8.26;
 import "@interfaces/IExecutor.sol";
 import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
 import "@uniswap-v2/contracts/interfaces/IUniswapV2Pair.sol";
-import "./TokenTransfer.sol";
+import {RestrictTransferFrom} from "../RestrictTransferFrom.sol";
 
 error UniswapV2Executor__InvalidDataLength();
 error UniswapV2Executor__InvalidTarget();
@@ -12,7 +12,7 @@ error UniswapV2Executor__InvalidFactory();
 error UniswapV2Executor__InvalidInitCode();
 error UniswapV2Executor__InvalidFee();
 
-contract UniswapV2Executor is IExecutor, TokenTransfer {
+contract UniswapV2Executor is IExecutor, RestrictTransferFrom {
     using SafeERC20 for IERC20;
 
     address public immutable factory;
@@ -25,7 +25,7 @@ contract UniswapV2Executor is IExecutor, TokenTransfer {
         bytes32 _initCode,
         address _permit2,
         uint256 _feeBps
-    ) TokenTransfer(_permit2) {
+    ) RestrictTransferFrom(_permit2) {
         if (_factory == address(0)) {
             revert UniswapV2Executor__InvalidFactory();
         }
@@ -59,9 +59,8 @@ contract UniswapV2Executor is IExecutor, TokenTransfer {
         _verifyPairAddress(target);
 
         calculatedAmount = _getAmountOut(target, givenAmount, zeroForOne);
-        _transfer(
+
-            address(tokenIn), msg.sender, target, givenAmount, transferType
+        _transfer(target, transferType, address(tokenIn), givenAmount);
-        );
 
         IUniswapV2Pair pool = IUniswapV2Pair(target);
         if (zeroForOne) {
@@ -88,7 +87,7 @@ contract UniswapV2Executor is IExecutor, TokenTransfer {
         inToken = IERC20(address(bytes20(data[0:20])));
         target = address(bytes20(data[20:40]));
         receiver = address(bytes20(data[40:60]));
-        zeroForOne = uint8(data[60]) > 0;
+        zeroForOne = data[60] != 0;
         transferType = TransferType(uint8(data[61]));
     }
 

foundry/src/executors/UniswapV3Executor.sol

@@ -5,15 +5,15 @@ import "@interfaces/IExecutor.sol";
 import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
 import "@uniswap/v3-core/contracts/interfaces/IUniswapV3Pool.sol";
 import "@interfaces/ICallback.sol";
-import {TokenTransfer} from "./TokenTransfer.sol";
+import {RestrictTransferFrom} from "../RestrictTransferFrom.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
 
 error UniswapV3Executor__InvalidDataLength();
 error UniswapV3Executor__InvalidFactory();
 error UniswapV3Executor__InvalidTarget();
 error UniswapV3Executor__InvalidInitCode();
-error UniswapV3Executor__InvalidTransferType(uint8 transferType);
 
-contract UniswapV3Executor is IExecutor, ICallback, TokenTransfer {
+contract UniswapV3Executor is IExecutor, ICallback, RestrictTransferFrom {
     using SafeERC20 for IERC20;
 
     uint160 private constant MIN_SQRT_RATIO = 4295128739;
@@ -25,7 +25,7 @@ contract UniswapV3Executor is IExecutor, ICallback, TokenTransfer {
     address private immutable self;
 
     constructor(address _factory, bytes32 _initCode, address _permit2)
-        TokenTransfer(_permit2)
+        RestrictTransferFrom(_permit2)
     {
         if (_factory == address(0)) {
             revert UniswapV3Executor__InvalidFactory();
@@ -97,21 +97,14 @@ contract UniswapV3Executor is IExecutor, ICallback, TokenTransfer {
             abi.decode(msgData[4:68], (int256, int256));
 
         address tokenIn = address(bytes20(msgData[132:152]));
-
-        // Transfer type does not exist
-        if (uint8(msgData[175]) > uint8(TransferType.NONE)) {
-            revert UniswapV3Executor__InvalidTransferType(uint8(msgData[175]));
-        }
-
         TransferType transferType = TransferType(uint8(msgData[175]));
-        address sender = address(bytes20(msgData[176:196]));
 
         verifyCallback(msgData[132:]);
 
         uint256 amountOwed =
             amount0Delta > 0 ? uint256(amount0Delta) : uint256(amount1Delta);
 
-        _transfer(tokenIn, sender, msg.sender, amountOwed, transferType);
+        _transfer(msg.sender, transferType, tokenIn, amountOwed);
 
         return abi.encode(amountOwed, tokenIn);
     }
@@ -162,10 +155,8 @@ contract UniswapV3Executor is IExecutor, ICallback, TokenTransfer {
         address tokenOut,
         uint24 fee,
         TransferType transferType
-    ) internal view returns (bytes memory) {
+    ) internal pure returns (bytes memory) {
-        return abi.encodePacked(
+        return abi.encodePacked(tokenIn, tokenOut, fee, uint8(transferType));
-            tokenIn, tokenOut, fee, uint8(transferType), msg.sender
-        );
     }
 
     function _verifyPairAddress(

foundry/src/executors/UniswapV4Executor.sol

@@ -3,7 +3,6 @@ pragma solidity ^0.8.26;
 
 import "@interfaces/IExecutor.sol";
 import {ICallback} from "@interfaces/ICallback.sol";
-import {TokenTransfer} from "./TokenTransfer.sol";
 import {
     IERC20,
     SafeERC20
@@ -23,6 +22,8 @@ import {IUnlockCallback} from
 import {SafeCast} from "@uniswap/v4-core/src/libraries/SafeCast.sol";
 import {TransientStateLibrary} from
     "@uniswap/v4-core/src/libraries/TransientStateLibrary.sol";
+import "../RestrictTransferFrom.sol";
+import "@openzeppelin/contracts/utils/Address.sol";
 
 error UniswapV4Executor__InvalidDataLength();
 error UniswapV4Executor__NotPoolManager();
@@ -37,7 +38,7 @@ contract UniswapV4Executor is
     IExecutor,
     IUnlockCallback,
     ICallback,
-    TokenTransfer
+    RestrictTransferFrom
 {
     using SafeERC20 for IERC20;
     using CurrencyLibrary for Currency;
@@ -47,8 +48,8 @@ contract UniswapV4Executor is
     IPoolManager public immutable poolManager;
     address private immutable _self;
 
-    bytes4 constant SWAP_EXACT_INPUT_SINGLE_SELECTOR = 0x8bc6d0d7;
+    bytes4 constant SWAP_EXACT_INPUT_SINGLE_SELECTOR = 0x6022fbcd;
-    bytes4 constant SWAP_EXACT_INPUT_SELECTOR = 0xaf90aeb1;
+    bytes4 constant SWAP_EXACT_INPUT_SELECTOR = 0x044f0d3d;
 
     struct UniswapV4Pool {
         address intermediaryToken;
@@ -57,7 +58,7 @@ contract UniswapV4Executor is
     }
 
     constructor(IPoolManager _poolManager, address _permit2)
-        TokenTransfer(_permit2)
+        RestrictTransferFrom(_permit2)
     {
         poolManager = _poolManager;
         _self = address(this);
@@ -100,7 +101,6 @@ contract UniswapV4Executor is
                 key,
                 zeroForOne,
                 amountIn,
-                msg.sender,
                 transferType,
                 receiver,
                 bytes("")
@@ -123,7 +123,6 @@ contract UniswapV4Executor is
                 currencyIn,
                 path,
                 amountIn,
-                msg.sender,
                 transferType,
                 receiver
             );
@@ -153,7 +152,7 @@ contract UniswapV4Executor is
 
         tokenIn = address(bytes20(data[0:20]));
         tokenOut = address(bytes20(data[20:40]));
-        zeroForOne = (data[40] != 0);
+        zeroForOne = data[40] != 0;
         transferType = TransferType(uint8(data[41]));
         receiver = address(bytes20(data[42:62]));
 
@@ -239,8 +238,7 @@ contract UniswapV4Executor is
      * @param poolKey The key of the pool to swap in.
      * @param zeroForOne Whether the swap is from token0 to token1 (true) or vice versa (false).
      * @param amountIn The amount of tokens to swap in.
-     * @param sender The address of the sender.
+     * @param transferType The type of action necessary to pay back the pool.
-     * @param transferType The type of transfer in to use.
      * @param receiver The address of the receiver.
      * @param hookData Additional data for hook contracts.
      */
@@ -248,7 +246,6 @@ contract UniswapV4Executor is
         PoolKey memory poolKey,
         bool zeroForOne,
         uint128 amountIn,
-        address sender,
         TransferType transferType,
         address receiver,
         bytes calldata hookData
@@ -262,7 +259,7 @@ contract UniswapV4Executor is
         if (amount > amountIn) {
             revert UniswapV4Executor__V4TooMuchRequested(amountIn, amount);
         }
-        _settle(currencyIn, amount, sender, transferType);
+        _settle(currencyIn, amount, transferType);
 
         Currency currencyOut =
             zeroForOne ? poolKey.currency1 : poolKey.currency0;
@@ -275,15 +272,13 @@ contract UniswapV4Executor is
      * @param currencyIn The currency of the input token.
      * @param path The path to swap along.
      * @param amountIn The amount of tokens to swap in.
-     * @param sender The address of the sender.
+     * @param transferType The type of action necessary to pay back the pool.
-     * @param transferType The type of transfer in to use.
      * @param receiver The address of the receiver.
      */
     function swapExactInput(
         Currency currencyIn,
         PathKey[] calldata path,
         uint128 amountIn,
-        address sender,
         TransferType transferType,
         address receiver
     ) external returns (uint128) {
@@ -315,7 +310,7 @@ contract UniswapV4Executor is
         if (amount > amountIn) {
             revert UniswapV4Executor__V4TooMuchRequested(amountIn, amount);
         }
-        _settle(currencyIn, amount, sender, transferType);
+        _settle(currencyIn, amount, transferType);
 
         _take(
             swapCurrencyIn, // at the end of the loop this is actually currency out
@@ -387,14 +382,12 @@ contract UniswapV4Executor is
      * @dev The implementing contract must ensure that the `payer` is a secure address.
      * @param currency The currency to settle.
      * @param amount The amount to send.
-     * @param sender The address of the payer.
+     * @param transferType The type of action necessary to pay back the pool.
-     * @param transferType The type of transfer to use.
      * @dev Returns early if the amount is 0.
      */
     function _settle(
         Currency currency,
         uint256 amount,
-        address sender,
         TransferType transferType
     ) internal {
         if (amount == 0) return;
@@ -404,11 +397,10 @@ contract UniswapV4Executor is
             poolManager.settle{value: amount}();
         } else {
             _transfer(
-                Currency.unwrap(currency),
-                sender,
                 address(poolManager),
-                amount,
+                transferType,
-                transferType
+                Currency.unwrap(currency),
+                amount
             );
             // slither-disable-next-line unused-return
             poolManager.settle();

foundry/test/TychoRouterProtocolIntegration.t.sol

@@ -26,7 +26,7 @@ contract TychoRouterTestProtocolIntegration is TychoRouterTestSetup {
             USDE_ADDR,
             USDT_ADDR,
             true,
-            TokenTransfer.TransferType.TRANSFER_PERMIT2_TO_PROTOCOL,
+            RestrictTransferFrom.TransferType.TransferFrom,
             ALICE,
             pools
         );
@@ -55,7 +55,7 @@ contract TychoRouterTestProtocolIntegration is TychoRouterTestSetup {
         // This test has two uniswap v4 hops that will be executed inside of the V4 pool manager
         // USDE -> USDT -> WBTC
         uint256 amountIn = 100 ether;
-        deal(USDE_ADDR, tychoRouterAddr, amountIn);
+        deal(USDE_ADDR, ALICE, amountIn);
 
         UniswapV4Executor.UniswapV4Pool[] memory pools =
             new UniswapV4Executor.UniswapV4Pool[](2);
@@ -74,7 +74,7 @@ contract TychoRouterTestProtocolIntegration is TychoRouterTestSetup {
             USDE_ADDR,
             WBTC_ADDR,
             true,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL,
+            RestrictTransferFrom.TransferType.TransferFrom,
             ALICE,
             pools
         );
@@ -82,8 +82,18 @@ contract TychoRouterTestProtocolIntegration is TychoRouterTestSetup {
         bytes memory swap =
             encodeSingleSwap(address(usv4Executor), protocolData);
 
+        vm.startPrank(ALICE);
+        IERC20(USDE_ADDR).approve(tychoRouterAddr, amountIn);
         tychoRouter.singleSwap(
-            amountIn, USDE_ADDR, WBTC_ADDR, 118280, false, false, ALICE, swap
+            amountIn,
+            USDE_ADDR,
+            WBTC_ADDR,
+            118280,
+            false,
+            false,
+            ALICE,
+            true,
+            swap
         );
 
         assertEq(IERC20(WBTC_ADDR).balanceOf(ALICE), 118281);
@@ -262,7 +272,7 @@ contract TychoRouterTestProtocolIntegration is TychoRouterTestSetup {
             ALICE,
             DAI_WETH_USV3,
             zeroForOne,
-            TokenTransfer.TransferType.TRANSFER_PERMIT2_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.TransferFrom
         );
         bytes memory swap =
             encodeSingleSwap(address(usv3Executor), protocolData);

foundry/test/TychoRouterSequentialSwap.t.sol

@@ -8,25 +8,21 @@ import "./executors/UniswapV4Utils.sol";
 import {SafeCallback} from "@uniswap/v4-periphery/src/base/SafeCallback.sol";
 
 contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
-    function _getSequentialSwaps(bool permit2)
+    function _getSequentialSwaps() internal view returns (bytes[] memory) {
-        internal
-        view
-        returns (bytes[] memory)
-    {
         // Trade 1 WETH for USDC through DAI with 2 swaps on Uniswap V2
         // 1 WETH   ->   DAI   ->   USDC
         //       (univ2)     (univ2)
 
-        TokenTransfer.TransferType transferType = permit2
-            ? TokenTransfer.TransferType.TRANSFER_PERMIT2_TO_PROTOCOL
-            : TokenTransfer.TransferType.TRANSFER_FROM_TO_PROTOCOL;
-
         bytes[] memory swaps = new bytes[](2);
         // WETH -> DAI
         swaps[0] = encodeSequentialSwap(
             address(usv2Executor),
             encodeUniswapV2Swap(
-                WETH_ADDR, WETH_DAI_POOL, tychoRouterAddr, false, transferType
+                WETH_ADDR,
+                WETH_DAI_POOL,
+                DAI_USDC_POOL, // receiver (direct to next pool)
+                false,
+                RestrictTransferFrom.TransferType.TransferFrom // transfer to protocol from router
             )
         );
 
@@ -38,7 +34,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
                 DAI_USDC_POOL,
                 ALICE,
                 true,
-                TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+                RestrictTransferFrom.TransferType.None // funds already sent to pool
             )
         );
         return swaps;
@@ -55,7 +51,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
             bytes memory signature
         ) = handlePermit2Approval(WETH_ADDR, tychoRouterAddr, amountIn);
 
-        bytes[] memory swaps = _getSequentialSwaps(true);
+        bytes[] memory swaps = _getSequentialSwaps();
         tychoRouter.sequentialSwapPermit2(
             amountIn,
             WETH_ADDR,
@@ -82,7 +78,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
         vm.startPrank(ALICE);
         IERC20(WETH_ADDR).approve(tychoRouterAddr, amountIn);
 
-        bytes[] memory swaps = _getSequentialSwaps(false);
+        bytes[] memory swaps = _getSequentialSwaps();
         tychoRouter.sequentialSwap(
             amountIn,
             WETH_ADDR,
@@ -91,6 +87,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
             false,
             false,
             ALICE,
+            true,
             pleEncode(swaps)
         );
 
@@ -107,7 +104,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
         vm.startPrank(ALICE);
         IERC20(WETH_ADDR).approve(tychoRouterAddr, amountIn);
 
-        bytes[] memory swaps = _getSequentialSwaps(false);
+        bytes[] memory swaps = _getSequentialSwaps();
         vm.expectRevert(TychoRouter__UndefinedMinAmountOut.selector);
         tychoRouter.sequentialSwap(
             amountIn,
@@ -117,6 +114,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
             false,
             false,
             ALICE,
+            true,
             pleEncode(swaps)
         );
     }
@@ -129,7 +127,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
         vm.startPrank(ALICE);
         IERC20(WETH_ADDR).approve(tychoRouterAddr, amountIn - 1);
 
-        bytes[] memory swaps = _getSequentialSwaps(false);
+        bytes[] memory swaps = _getSequentialSwaps();
         vm.expectRevert();
         tychoRouter.sequentialSwap(
             amountIn,
@@ -139,6 +137,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
             false,
             false,
             ALICE,
+            true,
             pleEncode(swaps)
         );
     }
@@ -154,7 +153,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
             bytes memory signature
         ) = handlePermit2Approval(WETH_ADDR, tychoRouterAddr, amountIn);
 
-        bytes[] memory swaps = _getSequentialSwaps(true);
+        bytes[] memory swaps = _getSequentialSwaps();
 
         uint256 minAmountOut = 3000 * 1e18;
 
@@ -204,9 +203,9 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
             encodeUniswapV2Swap(
                 WETH_ADDR,
                 WETH_DAI_POOL,
-                tychoRouterAddr,
+                DAI_USDC_POOL,
                 false,
-                TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+                RestrictTransferFrom.TransferType.Transfer
             )
         );
 
@@ -218,7 +217,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
                 DAI_USDC_POOL,
                 ALICE,
                 true,
-                TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+                RestrictTransferFrom.TransferType.None
             )
         );
 
@@ -266,7 +265,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
                 DAI_USDC_POOL,
                 tychoRouterAddr,
                 false,
-                TokenTransfer.TransferType.TRANSFER_PERMIT2_TO_PROTOCOL
+                RestrictTransferFrom.TransferType.TransferFrom
             )
         );
 
@@ -278,7 +277,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
                 WETH_DAI_POOL,
                 tychoRouterAddr,
                 true,
-                TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+                RestrictTransferFrom.TransferType.Transfer
             )
         );
 
@@ -315,7 +314,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
             tychoRouterAddr,
             USDC_WETH_USV3,
             true,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         bytes memory usdcWethV3Pool2OneZeroData = encodeUniswapV3Swap(
@@ -324,7 +323,7 @@ contract TychoRouterSequentialSwapTest is TychoRouterTestSetup {
             tychoRouterAddr,
             USDC_WETH_USV3_2,
             false,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         bytes[] memory swaps = new bytes[](2);

foundry/test/TychoRouterSingleSwap.t.sol

@@ -26,7 +26,7 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
             WETH_DAI_POOL,
             ALICE,
             false,
-            TokenTransfer.TransferType.TRANSFER_PERMIT2_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.TransferFrom
         );
 
         bytes memory swap =
@@ -67,7 +67,7 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
             WETH_DAI_POOL,
             ALICE,
             false,
-            TokenTransfer.TransferType.TRANSFER_FROM_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.TransferFrom
         );
 
         bytes memory swap =
@@ -82,6 +82,7 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
             false,
             false,
             ALICE,
+            true,
             swap
         );
 
@@ -108,7 +109,7 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
             WETH_DAI_POOL,
             ALICE,
             false,
-            TokenTransfer.TransferType.TRANSFER_FROM_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.None
         );
 
         bytes memory swap =
@@ -116,7 +117,7 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
 
         vm.expectRevert(TychoRouter__UndefinedMinAmountOut.selector);
         tychoRouter.singleSwap(
-            amountIn, WETH_ADDR, DAI_ADDR, 0, false, false, ALICE, swap
+            amountIn, WETH_ADDR, DAI_ADDR, 0, false, false, ALICE, true, swap
         );
     }
 
@@ -134,7 +135,7 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
             WETH_DAI_POOL,
             ALICE,
             false,
-            TokenTransfer.TransferType.TRANSFER_FROM_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.TransferFrom
         );
 
         bytes memory swap =
@@ -150,6 +151,7 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
             false,
             false,
             ALICE,
+            true,
             swap
         );
     }
@@ -169,7 +171,7 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
             WETH_DAI_POOL,
             ALICE,
             false,
-            TokenTransfer.TransferType.TRANSFER_FROM_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.TransferFrom
         );
 
         bytes memory swap =
@@ -192,6 +194,7 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
             false,
             false,
             ALICE,
+            true,
             swap
         );
     }
@@ -218,7 +221,7 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
             WETH_DAI_POOL,
             ALICE,
             false,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer // ETH has already been transferred to router
         );
 
         bytes memory swap =
@@ -261,7 +264,7 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
             WETH_DAI_POOL,
             tychoRouterAddr,
             true,
-            TokenTransfer.TransferType.TRANSFER_PERMIT2_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.TransferFrom
         );
 
         bytes memory swap =
@@ -287,6 +290,49 @@ contract TychoRouterSingleSwapTest is TychoRouterTestSetup {
         vm.stopPrank();
     }
 
+    function testSingleSwapNoTransferNeededIllegalTransfer() public {
+        // Tokens are already in the router, there is no need to transfer them.
+        // Failure because there will be an attempt on an illegal transfer.
+        uint256 amountIn = 1 ether;
+
+        deal(WETH_ADDR, address(tychoRouter), amountIn);
+        vm.startPrank(ALICE);
+        // Approve the tokenIn to be transferred to the router
+        IERC20(WETH_ADDR).approve(address(tychoRouterAddr), amountIn);
+
+        bytes memory protocolData = encodeUniswapV2Swap(
+            WETH_ADDR,
+            WETH_DAI_POOL,
+            ALICE,
+            false,
+            RestrictTransferFrom.TransferType.TransferFrom
+        );
+
+        bytes memory swap =
+            encodeSingleSwap(address(usv2Executor), protocolData);
+
+        vm.expectRevert(
+            abi.encodeWithSelector(
+                RestrictTransferFrom__ExceededTransferFromAllowance.selector,
+                0, // allowed amount
+                amountIn // attempted amount
+            )
+        );
+        uint256 amountOut = tychoRouter.singleSwap(
+            amountIn,
+            WETH_ADDR,
+            DAI_ADDR,
+            2000 * 1e18,
+            false,
+            false,
+            ALICE,
+            false,
+            swap
+        );
+
+        vm.stopPrank();
+    }
+
     function testSingleSwapIntegration() public {
         // Tests swapping WETH -> DAI on a USV2 pool with regular approvals
         deal(WETH_ADDR, ALICE, 1 ether);

foundry/test/TychoRouterSplitSwap.t.sol

@@ -2,13 +2,13 @@
 pragma solidity ^0.8.26;
 
 import "@src/executors/UniswapV4Executor.sol";
-import {TychoRouter} from "@src/TychoRouter.sol";
+import {TychoRouter, RestrictTransferFrom} from "@src/TychoRouter.sol";
 import "./TychoRouterTestSetup.sol";
 import "./executors/UniswapV4Utils.sol";
 import {SafeCallback} from "@uniswap/v4-periphery/src/base/SafeCallback.sol";
 
 contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
-    function _getSplitSwaps(bool permit2)
+    function _getSplitSwaps(bool transferFrom)
         private
         view
         returns (bytes[] memory)
@@ -19,10 +19,9 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
         //          ->   WBTC  ->
         //       (univ2)     (univ2)
         bytes[] memory swaps = new bytes[](4);
-
+        RestrictTransferFrom.TransferType transferType = transferFrom
-        TokenTransfer.TransferType inTransferType = permit2
+            ? RestrictTransferFrom.TransferType.TransferFrom
-            ? TokenTransfer.TransferType.TRANSFER_PERMIT2_TO_PROTOCOL
+            : RestrictTransferFrom.TransferType.Transfer;
-            : TokenTransfer.TransferType.TRANSFER_FROM_TO_PROTOCOL;
 
         // WETH -> WBTC (60%)
         swaps[0] = encodeSplitSwap(
@@ -31,11 +30,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             (0xffffff * 60) / 100, // 60%
             address(usv2Executor),
             encodeUniswapV2Swap(
-                WETH_ADDR,
+                WETH_ADDR, WETH_WBTC_POOL, tychoRouterAddr, false, transferType
-                WETH_WBTC_POOL,
-                tychoRouterAddr,
-                false,
-                inTransferType
             )
         );
         // WBTC -> USDC
@@ -49,7 +44,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
                 USDC_WBTC_POOL,
                 ALICE,
                 true,
-                TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+                RestrictTransferFrom.TransferType.Transfer
             )
         );
         // WETH -> DAI
@@ -59,7 +54,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             uint24(0),
             address(usv2Executor),
             encodeUniswapV2Swap(
-                WETH_ADDR, WETH_DAI_POOL, tychoRouterAddr, false, inTransferType
+                WETH_ADDR, WETH_DAI_POOL, tychoRouterAddr, false, transferType
             )
         );
 
@@ -74,7 +69,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
                 DAI_USDC_POOL,
                 ALICE,
                 true,
-                TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+                RestrictTransferFrom.TransferType.Transfer
             )
         );
 
@@ -85,9 +80,8 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
         // Trade 1 WETH for USDC through DAI and WBTC - see _getSplitSwaps for more info
 
         uint256 amountIn = 1 ether;
-        deal(WETH_ADDR, ALICE, amountIn);
+        deal(WETH_ADDR, address(tychoRouterAddr), amountIn);
         vm.startPrank(ALICE);
-        IERC20(WETH_ADDR).approve(address(tychoRouterAddr), amountIn);
         bytes[] memory swaps = _getSplitSwaps(false);
         tychoRouter.exposedSplitSwap(amountIn, 4, pleEncode(swaps));
         vm.stopPrank();
@@ -138,7 +132,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
         vm.startPrank(ALICE);
         IERC20(WETH_ADDR).approve(tychoRouterAddr, amountIn);
 
-        bytes[] memory swaps = _getSplitSwaps(false);
+        bytes[] memory swaps = _getSplitSwaps(true);
 
         tychoRouter.splitSwap(
             amountIn,
@@ -149,6 +143,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             false,
             4,
             ALICE,
+            true,
             pleEncode(swaps)
         );
 
@@ -165,7 +160,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
         vm.startPrank(ALICE);
         IERC20(WETH_ADDR).approve(address(tychoRouterAddr), amountIn);
 
-        bytes[] memory swaps = _getSplitSwaps(false);
+        bytes[] memory swaps = _getSplitSwaps(true);
 
         vm.expectRevert(TychoRouter__UndefinedMinAmountOut.selector);
         tychoRouter.splitSwap(
@@ -177,6 +172,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             false,
             4,
             ALICE,
+            true,
             pleEncode(swaps)
         );
         vm.stopPrank();
@@ -190,7 +186,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
         vm.startPrank(ALICE);
         // Approve less than the amountIn
         IERC20(WETH_ADDR).approve(address(tychoRouterAddr), amountIn - 1);
-        bytes[] memory swaps = _getSplitSwaps(false);
+        bytes[] memory swaps = _getSplitSwaps(true);
 
         vm.expectRevert();
         tychoRouter.splitSwap(
@@ -202,6 +198,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             false,
             2,
             ALICE,
+            true,
             pleEncode(swaps)
         );
 
@@ -270,7 +267,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             WETH_DAI_POOL,
             ALICE,
             false,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         bytes memory swap = encodeSplitSwap(
@@ -319,7 +316,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             WETH_DAI_POOL,
             tychoRouterAddr,
             true,
-            TokenTransfer.TransferType.TRANSFER_PERMIT2_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.TransferFrom
         );
 
         bytes memory swap = encodeSplitSwap(
@@ -365,10 +362,10 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
         //            │                              │
         //            └─ (USV3, 40% split) ──> WETH ─┘
         uint256 amountIn = 100 * 10 ** 6;
-        deal(USDC_ADDR, ALICE, amountIn);
+
+        // Assume funds have already been transferred to tychoRouter
+        deal(USDC_ADDR, tychoRouterAddr, amountIn);
         vm.startPrank(ALICE);
-        // Approve the TychoRouter to spend USDC
-        IERC20(USDC_ADDR).approve(tychoRouterAddr, amountIn);
 
         bytes memory usdcWethV3Pool1ZeroOneData = encodeUniswapV3Swap(
             USDC_ADDR,
@@ -376,7 +373,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             tychoRouterAddr,
             USDC_WETH_USV3,
             true,
-            TokenTransfer.TransferType.TRANSFER_FROM_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         bytes memory usdcWethV3Pool2ZeroOneData = encodeUniswapV3Swap(
@@ -385,7 +382,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             tychoRouterAddr,
             USDC_WETH_USV3_2,
             true,
-            TokenTransfer.TransferType.TRANSFER_FROM_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         bytes memory wethUsdcV2OneZeroData = encodeUniswapV2Swap(
@@ -393,7 +390,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             USDC_WETH_USV2,
             tychoRouterAddr,
             false,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         bytes[] memory swaps = new bytes[](3);
@@ -426,6 +423,74 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
         assertEq(IERC20(USDC_ADDR).balanceOf(tychoRouterAddr), 99654537);
     }
 
+    function testSplitInputIllegalTransfers() public {
+        // This test attempts to perform multiple `transferFrom`s - which is not
+        // permitted by the TychoRouter.
+        //
+        // The flow is:
+        //            ┌─ (USV3, 60% split) ───┐
+        //            │                       │
+        // USDC ──────┤                       ├────> WETH
+        //            │                       │
+        //            └─ (USV3, 40% split) ───┘
+        uint256 amountIn = 100 * 10 ** 6;
+
+        // Assume funds have already been transferred to tychoRouter
+        deal(USDC_ADDR, ALICE, amountIn);
+        vm.startPrank(ALICE);
+        IERC20(USDC_ADDR).approve(tychoRouterAddr, amountIn);
+
+        bytes memory usdcWethV3Pool1ZeroOneData = encodeUniswapV3Swap(
+            USDC_ADDR,
+            WETH_ADDR,
+            tychoRouterAddr,
+            USDC_WETH_USV3,
+            true,
+            RestrictTransferFrom.TransferType.Transfer
+        );
+
+        bytes memory usdcWethV3Pool2ZeroOneData = encodeUniswapV3Swap(
+            USDC_ADDR,
+            WETH_ADDR,
+            tychoRouterAddr,
+            USDC_WETH_USV3_2,
+            true,
+            RestrictTransferFrom.TransferType.Transfer
+        );
+
+        bytes[] memory swaps = new bytes[](2);
+        // USDC -> WETH (60% split)
+        swaps[0] = encodeSplitSwap(
+            uint8(0),
+            uint8(1),
+            (0xffffff * 60) / 100, // 60%
+            address(usv3Executor),
+            usdcWethV3Pool1ZeroOneData
+        );
+        // USDC -> WETH (40% remainder)
+        swaps[1] = encodeSplitSwap(
+            uint8(0),
+            uint8(1),
+            uint24(0),
+            address(usv3Executor),
+            usdcWethV3Pool2ZeroOneData
+        );
+        vm.expectRevert();
+        tychoRouter.splitSwap(
+            amountIn,
+            USDC_ADDR,
+            WETH_ADDR,
+            1,
+            false,
+            false,
+            2,
+            ALICE,
+            true,
+            pleEncode(swaps)
+        );
+        vm.stopPrank();
+    }
+
     function testSplitOutputCyclicSwapInternalMethod() public {
         // This test has start and end tokens that are the same
         // The flow is:
@@ -443,7 +508,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             USDC_WETH_USV2,
             tychoRouterAddr,
             true,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         bytes memory usdcWethV3Pool1OneZeroData = encodeUniswapV3Swap(
@@ -452,7 +517,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             tychoRouterAddr,
             USDC_WETH_USV3,
             false,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         bytes memory usdcWethV3Pool2OneZeroData = encodeUniswapV3Swap(
@@ -461,7 +526,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             tychoRouterAddr,
             USDC_WETH_USV3_2,
             false,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         bytes[] memory swaps = new bytes[](3);
@@ -504,7 +569,7 @@ contract TychoRouterSplitSwapTest is TychoRouterTestSetup {
             USDC_MAG7_POOL,
             tychoRouterAddr,
             true,
-            TokenTransfer.TransferType.TRANSFER_FROM_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         bytes memory swap = encodeSplitSwap(

foundry/test/TychoRouterTestSetup.sol

@@ -28,6 +28,17 @@ contract TychoRouterExposed is TychoRouter {
         return _unwrapETH(amount);
     }
 
+    function tstoreExposed(
+        address tokenIn,
+        uint256 amountIn,
+        bool isPermit2,
+        bool transferFromNeeded
+    ) external {
+        _tstoreTransferFromInfo(
+            tokenIn, amountIn, isPermit2, transferFromNeeded
+        );
+    }
+
     function exposedSplitSwap(
         uint256 amountIn,
         uint256 nTokens,
@@ -185,7 +196,7 @@ contract TychoRouterTestSetup is Constants, Permit2TestHelper, TestUtils {
         address target,
         address receiver,
         bool zero2one,
-        TokenTransfer.TransferType transferType
+        RestrictTransferFrom.TransferType transferType
     ) internal pure returns (bytes memory) {
         return
             abi.encodePacked(tokenIn, target, receiver, zero2one, transferType);
@@ -197,7 +208,7 @@ contract TychoRouterTestSetup is Constants, Permit2TestHelper, TestUtils {
         address receiver,
         address target,
         bool zero2one,
-        TokenTransfer.TransferType transferType
+        RestrictTransferFrom.TransferType transferType
     ) internal view returns (bytes memory) {
         IUniswapV3Pool pool = IUniswapV3Pool(target);
         return abi.encodePacked(

foundry/test/assets/calldata.txt

@@ -1,28 +1,29 @@
-test_uniswap_v3_uniswap_v2: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
+test_uniswap_v3_uniswap_v2: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
-test_single_encoding_strategy_ekubo: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
+test_single_encoding_strategy_ekubo: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-test_uniswap_v3_curve:e8a980d70000000000000000000000000000000000000000000000000de0b6b3a7640000000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec700000000000000000000000000000000000000000000000000000000018f61ec00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000d600692e234dae75c793f67a35089c9d99245e1c58470bc02aaa39b223fe8d0a0e5c4f27ead9083c756cc22260fac5e5542a773aa44fbcfedf7c193bc2c599000bb83ede3eca2a72b3aecc820e955b36f38437d01395cbcdf9626bc03e24f779434178a73a0b4bad62ed000100691d1499e622d69689cdf9004d05ec547d650ff2112260fac5e5542a773aa44fbcfedf7c193bc2c599dac17f958d2ee523a2206206994597c13d831ec7d51a44d3fae010294c616388b506acda1bfaae460301000105cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc200000000000000000000
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-test_multi_protocol: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-test_encode_balancer_v2:c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2ba100000625a3754423978a60c9317c58a424e3d5c6ee304399dbdb9c8ef030ab642b10820db8f560002000000000000000000141d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e0105
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-test_ekubo_encode_swap_multi:00ca4f73fe97d0b987a0d12b39bbd562c779bab6f60000000000000000000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb4851d02a5948496a67827242eabc5725531342527c000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec700000000000000000000000000000000000000000001a36e2eb1c43200000032
+test_ekubo_encode_swap_multi:01ca4f73fe97d0b987a0d12b39bbd562c779bab6f60000000000000000000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb4851d02a5948496a67827242eabc5725531342527c000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec700000000000000000000000000000000000000000001a36e2eb1c43200000032
-test_encode_uniswap_v4_sequential_swap:4c9edd5852cd905f086c759e8383e09bff1e68b32260fac5e5542a773aa44fbcfedf7c193bc2c5990100cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2dac17f958d2ee523a2206206994597c13d831ec70000640000012260fac5e5542a773aa44fbcfedf7c193bc2c599000bb800003c
+test_encode_uniswap_v4_sequential_swap:4c9edd5852cd905f086c759e8383e09bff1e68b32260fac5e5542a773aa44fbcfedf7c193bc2c5990101cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2dac17f958d2ee523a2206206994597c13d831ec70000640000012260fac5e5542a773aa44fbcfedf7c193bc2c599000bb800003c
-test_encode_uniswap_v4_simple_swap:4c9edd5852cd905f086c759e8383e09bff1e68b3dac17f958d2ee523a2206206994597c13d831ec70100cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2dac17f958d2ee523a2206206994597c13d831ec7000064000001
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-test_single_encoding_strategy_maverick: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-test_encode_maverick_v2:40d16fc0246ad3160ccc09b8d0d3a2cd28ae6c2f14cf6d2fe3e1b326114b07d22a6f6bb59e346c671d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e00
+test_encode_maverick_v2:40d16fc0246ad3160ccc09b8d0d3a2cd28ae6c2f14cf6d2fe3e1b326114b07d22a6f6bb59e346c671d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e01
+test_encode_uniswap_v2:c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2a478c2975ab1ea89e8196811f51a7b7ade33eb111d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e0001

foundry/test/executors/BalancerV2Executor.t.sol

@@ -46,7 +46,7 @@ contract BalancerV2ExecutorTest is Constants, TestUtils {
             WETH_BAL_POOL_ID,
             address(2),
             true,
-            TokenTransfer.TransferType.NONE
+            RestrictTransferFrom.TransferType.None
         );
 
         (
@@ -55,7 +55,7 @@ contract BalancerV2ExecutorTest is Constants, TestUtils {
             bytes32 poolId,
             address receiver,
             bool needsApproval,
-            TokenTransfer.TransferType transferType
+            RestrictTransferFrom.TransferType transferType
         ) = balancerV2Exposed.decodeParams(params);
 
         assertEq(address(tokenIn), WETH_ADDR);
@@ -63,7 +63,9 @@ contract BalancerV2ExecutorTest is Constants, TestUtils {
         assertEq(poolId, WETH_BAL_POOL_ID);
         assertEq(receiver, address(2));
         assertEq(needsApproval, true);
-        assertEq(uint8(transferType), uint8(TokenTransfer.TransferType.NONE));
+        assertEq(
+            uint8(transferType), uint8(RestrictTransferFrom.TransferType.None)
+        );
     }
 
     function testDecodeParamsInvalidDataLength() public {
@@ -82,7 +84,7 @@ contract BalancerV2ExecutorTest is Constants, TestUtils {
             WETH_BAL_POOL_ID,
             BOB,
             true,
-            TokenTransfer.TransferType.NONE
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         deal(WETH_ADDR, address(balancerV2Exposed), amountIn);
@@ -104,7 +106,7 @@ contract BalancerV2ExecutorTest is Constants, TestUtils {
             bytes32 poolId,
             address receiver,
             bool needsApproval,
-            TokenTransfer.TransferType transferType
+            RestrictTransferFrom.TransferType transferType
         ) = balancerV2Exposed.decodeParams(protocolData);
 
         assertEq(address(tokenIn), WETH_ADDR);
@@ -112,7 +114,9 @@ contract BalancerV2ExecutorTest is Constants, TestUtils {
         assertEq(poolId, WETH_BAL_POOL_ID);
         assertEq(receiver, BOB);
         assertEq(needsApproval, true);
-        assertEq(uint8(transferType), uint8(TokenTransfer.TransferType.NONE));
+        assertEq(
+            uint8(transferType), uint8(RestrictTransferFrom.TransferType.None)
+        );
     }
 
     function testSwapIntegration() public {

foundry/test/executors/CurveExecutor.t.sol

@@ -37,7 +37,7 @@ contract CurveExecutorExposed is CurveExecutor {
             int128 i,
             int128 j,
             bool tokenApprovalNeeded,
-            TokenTransfer.TransferType transferType,
+            RestrictTransferFrom.TransferType transferType,
             address receiver
         )
     {
@@ -68,7 +68,7 @@ contract CurveExecutorTest is Test, Constants {
             uint8(2),
             uint8(0),
             true,
-            TokenTransfer.TransferType.NONE,
+            RestrictTransferFrom.TransferType.None,
             ALICE
         );
 
@@ -80,7 +80,7 @@ contract CurveExecutorTest is Test, Constants {
             int128 i,
             int128 j,
             bool tokenApprovalNeeded,
-            TokenTransfer.TransferType transferType,
+            RestrictTransferFrom.TransferType transferType,
             address receiver
         ) = curveExecutorExposed.decodeData(data);
 
@@ -91,7 +91,9 @@ contract CurveExecutorTest is Test, Constants {
         assertEq(i, 2);
         assertEq(j, 0);
         assertEq(tokenApprovalNeeded, true);
-        assertEq(uint8(transferType), uint8(TokenTransfer.TransferType.NONE));
+        assertEq(
+            uint8(transferType), uint8(RestrictTransferFrom.TransferType.None)
+        );
         assertEq(receiver, ALICE);
     }
 
@@ -100,7 +102,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 1 ether;
         deal(DAI_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data = _getData(DAI_ADDR, USDC_ADDR, TRIPOOL, 1, ALICE);
+        bytes memory data = _getData(
+            DAI_ADDR,
+            USDC_ADDR,
+            TRIPOOL,
+            1,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -113,8 +122,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 1 ether;
         deal(address(curveExecutorExposed), amountIn);
 
-        bytes memory data =
+        bytes memory data = _getData(
-            _getData(ETH_ADDR_FOR_CURVE, STETH_ADDR, STETH_POOL, 1, ALICE);
+            ETH_ADDR_FOR_CURVE,
+            STETH_ADDR,
+            STETH_POOL,
+            1,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -130,8 +145,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 1 ether;
         deal(WETH_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data =
+        bytes memory data = _getData(
-            _getData(WETH_ADDR, WBTC_ADDR, TRICRYPTO2_POOL, 3, ALICE);
+            WETH_ADDR,
+            WBTC_ADDR,
+            TRICRYPTO2_POOL,
+            3,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -144,7 +165,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 100 * 10 ** 6;
         deal(USDC_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data = _getData(USDC_ADDR, SUSD_ADDR, SUSD_POOL, 1, ALICE);
+        bytes memory data = _getData(
+            USDC_ADDR,
+            SUSD_ADDR,
+            SUSD_POOL,
+            1,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -157,8 +185,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 1 ether;
         deal(FRAX_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data =
+        bytes memory data = _getData(
-            _getData(FRAX_ADDR, USDC_ADDR, FRAX_USDC_POOL, 1, ALICE);
+            FRAX_ADDR,
+            USDC_ADDR,
+            FRAX_USDC_POOL,
+            1,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -171,8 +205,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 100 * 10 ** 6;
         deal(USDC_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data =
+        bytes memory data = _getData(
-            _getData(USDC_ADDR, USDE_ADDR, USDE_USDC_POOL, 1, ALICE);
+            USDC_ADDR,
+            USDE_ADDR,
+            USDE_USDC_POOL,
+            1,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -185,8 +225,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 100 * 10 ** 6;
         deal(DOLA_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data =
+        bytes memory data = _getData(
-            _getData(DOLA_ADDR, FRAXPYUSD_POOL, DOLA_FRAXPYUSD_POOL, 1, ALICE);
+            DOLA_ADDR,
+            FRAXPYUSD_POOL,
+            DOLA_FRAXPYUSD_POOL,
+            1,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -200,8 +246,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 initialBalance = address(ALICE).balance; // this address already has some ETH assigned to it
         deal(XYO_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data =
+        bytes memory data = _getData(
-            _getData(XYO_ADDR, ETH_ADDR_FOR_CURVE, ETH_XYO_POOL, 2, ALICE);
+            XYO_ADDR,
+            ETH_ADDR_FOR_CURVE,
+            ETH_XYO_POOL,
+            2,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -214,8 +266,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 1000 ether;
         deal(BSGG_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data =
+        bytes memory data = _getData(
-            _getData(BSGG_ADDR, USDT_ADDR, BSGG_USDT_POOL, 2, ALICE);
+            BSGG_ADDR,
+            USDT_ADDR,
+            BSGG_USDT_POOL,
+            2,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -228,8 +286,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 1 ether;
         deal(WETH_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data =
+        bytes memory data = _getData(
-            _getData(WETH_ADDR, USDC_ADDR, TRICRYPTO_POOL, 2, ALICE);
+            WETH_ADDR,
+            USDC_ADDR,
+            TRICRYPTO_POOL,
+            2,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -242,8 +306,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 1 ether;
         deal(UWU_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data =
+        bytes memory data = _getData(
-            _getData(UWU_ADDR, WETH_ADDR, UWU_WETH_POOL, 2, ALICE);
+            UWU_ADDR,
+            WETH_ADDR,
+            UWU_WETH_POOL,
+            2,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -256,8 +326,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 1 ether;
         deal(USDT_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data =
+        bytes memory data = _getData(
-            _getData(USDT_ADDR, CRVUSD_ADDR, CRVUSD_USDT_POOL, 1, ALICE);
+            USDT_ADDR,
+            CRVUSD_ADDR,
+            CRVUSD_USDT_POOL,
+            1,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -270,8 +346,14 @@ contract CurveExecutorTest is Test, Constants {
         uint256 amountIn = 100 * 10 ** 9; // 9 decimals
         deal(WTAO_ADDR, address(curveExecutorExposed), amountIn);
 
-        bytes memory data =
+        bytes memory data = _getData(
-            _getData(WTAO_ADDR, WSTTAO_ADDR, WSTTAO_WTAO_POOL, 1, ALICE);
+            WTAO_ADDR,
+            WSTTAO_ADDR,
+            WSTTAO_WTAO_POOL,
+            1,
+            ALICE,
+            RestrictTransferFrom.TransferType.None
+        );
 
         uint256 amountOut = curveExecutorExposed.swap(amountIn, data);
 
@@ -284,7 +366,8 @@ contract CurveExecutorTest is Test, Constants {
         address tokenOut,
         address pool,
         uint8 poolType,
-        address receiver
+        address receiver,
+        RestrictTransferFrom.TransferType transferType
     ) internal view returns (bytes memory data) {
         (int128 i, int128 j) = _getIndexes(tokenIn, tokenOut, pool);
         data = abi.encodePacked(
@@ -295,7 +378,7 @@ contract CurveExecutorTest is Test, Constants {
             uint8(uint256(uint128(i))),
             uint8(uint256(uint128(j))),
             true,
-            TokenTransfer.TransferType.NONE,
+            transferType,
             receiver
         );
     }

foundry/test/executors/EkuboExecutor.t.sol

@@ -3,7 +3,7 @@ pragma solidity ^0.8.26;
 
 import "../TestUtils.sol";
 import {Constants} from "../Constants.sol";
-import {EkuboExecutor, TokenTransfer} from "@src/executors/EkuboExecutor.sol";
+import "@src/executors/EkuboExecutor.sol";
 import {ICore} from "@ekubo/interfaces/ICore.sol";
 import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
 import {NATIVE_TOKEN_ADDRESS} from "@ekubo/math/constants.sol";
@@ -45,7 +45,7 @@ contract EkuboExecutorTest is Constants, TestUtils {
         uint256 usdcBalanceBeforeExecutor = USDC.balanceOf(address(executor));
 
         bytes memory data = abi.encodePacked(
-            uint8(TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL), // transferType (transfer from executor to core)
+            uint8(RestrictTransferFrom.TransferType.Transfer), // transfer type (transfer from executor to core)
             address(executor), // receiver
             NATIVE_TOKEN_ADDRESS, // tokenIn
             USDC_ADDR, // tokenOut
@@ -82,7 +82,7 @@ contract EkuboExecutorTest is Constants, TestUtils {
         uint256 ethBalanceBeforeExecutor = address(executor).balance;
 
         bytes memory data = abi.encodePacked(
-            uint8(TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL), // transferType (transfer from executor to core)
+            uint8(RestrictTransferFrom.TransferType.Transfer), // transferNeeded (transfer from executor to core)
             address(executor), // receiver
             USDC_ADDR, // tokenIn
             NATIVE_TOKEN_ADDRESS, // tokenOut
@@ -140,7 +140,7 @@ contract EkuboExecutorTest is Constants, TestUtils {
     // Same test case as in swap_encoder::tests::ekubo::test_encode_swap_multi
     function testMultiHopSwap() public {
         bytes memory data = abi.encodePacked(
-            uint8(TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL), // transferType
+            uint8(RestrictTransferFrom.TransferType.Transfer), // transferNeeded (transfer from executor to core)
             address(executor), // receiver
             NATIVE_TOKEN_ADDRESS, // tokenIn
             USDC_ADDR, // tokenOut of 1st swap

foundry/test/executors/MaverickV2Executor.t.sol

@@ -17,7 +17,7 @@ contract MaverickV2ExecutorExposed is MaverickV2Executor {
             IERC20 tokenIn,
             address target,
             address receiver,
-            TransferType transferType
+            RestrictTransferFrom.TransferType transferType
         )
     {
         return _decodeData(data);
@@ -43,14 +43,14 @@ contract MaverickV2ExecutorTest is TestUtils, Constants {
             GHO_ADDR,
             GHO_USDC_POOL,
             address(2),
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         (
             IERC20 tokenIn,
             address target,
             address receiver,
-            TokenTransfer.TransferType transferType
+            RestrictTransferFrom.TransferType transferType
         ) = maverickV2Exposed.decodeParams(params);
 
         assertEq(address(tokenIn), GHO_ADDR);
@@ -58,7 +58,7 @@ contract MaverickV2ExecutorTest is TestUtils, Constants {
         assertEq(receiver, address(2));
         assertEq(
             uint8(transferType),
-            uint8(TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL)
+            uint8(RestrictTransferFrom.TransferType.Transfer)
         );
     }
 
@@ -76,7 +76,7 @@ contract MaverickV2ExecutorTest is TestUtils, Constants {
             GHO_ADDR,
             GHO_USDC_POOL,
             BOB,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         deal(GHO_ADDR, address(maverickV2Exposed), amountIn);
@@ -98,7 +98,7 @@ contract MaverickV2ExecutorTest is TestUtils, Constants {
             IERC20 tokenIn,
             address pool,
             address receiver,
-            TokenTransfer.TransferType transferType
+            RestrictTransferFrom.TransferType transferType
         ) = maverickV2Exposed.decodeParams(protocolData);
 
         assertEq(address(tokenIn), GHO_ADDR);
@@ -106,7 +106,7 @@ contract MaverickV2ExecutorTest is TestUtils, Constants {
         assertEq(receiver, BOB);
         assertEq(
             uint8(transferType),
-            uint8(TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL)
+            uint8(RestrictTransferFrom.TransferType.Transfer)
         );
     }
 

foundry/test/executors/UniswapV2Executor.t.sol

@@ -1,11 +1,11 @@
 // SPDX-License-Identifier: BUSL-1.1
 pragma solidity ^0.8.26;
 
+import "../TestUtils.sol";
 import "@src/executors/UniswapV2Executor.sol";
-import "@src/executors/TokenTransfer.sol";
-import {Test} from "../../lib/forge-std/src/Test.sol";
 import {Constants} from "../Constants.sol";
 import {Permit2TestHelper} from "../Permit2TestHelper.sol";
+import {Test} from "../../lib/forge-std/src/Test.sol";
 
 contract UniswapV2ExecutorExposed is UniswapV2Executor {
     constructor(
@@ -23,7 +23,7 @@ contract UniswapV2ExecutorExposed is UniswapV2Executor {
             address target,
             address receiver,
             bool zeroForOne,
-            TransferType transferType
+            RestrictTransferFrom.TransferType transferType
         )
     {
         return _decodeData(data);
@@ -52,7 +52,7 @@ contract FakeUniswapV2Pool {
     }
 }
 
-contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
+contract UniswapV2ExecutorTest is Constants, Permit2TestHelper, TestUtils {
     using SafeERC20 for IERC20;
 
     UniswapV2ExecutorExposed uniswapV2Exposed;
@@ -60,7 +60,6 @@ contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
     UniswapV2ExecutorExposed pancakeswapV2Exposed;
     IERC20 WETH = IERC20(WETH_ADDR);
     IERC20 DAI = IERC20(DAI_ADDR);
-    IAllowanceTransfer permit2;
 
     function setUp() public {
         uint256 forkBlock = 17323404;
@@ -80,7 +79,6 @@ contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
             PERMIT2_ADDRESS,
             25
         );
-        permit2 = IAllowanceTransfer(PERMIT2_ADDRESS);
     }
 
     function testDecodeParams() public view {
@@ -89,7 +87,7 @@ contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
             address(2),
             address(3),
             false,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         (
@@ -97,7 +95,7 @@ contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
             address target,
             address receiver,
             bool zeroForOne,
-            TokenTransfer.TransferType transferType
+            RestrictTransferFrom.TransferType transferType
         ) = uniswapV2Exposed.decodeParams(params);
 
         assertEq(address(tokenIn), WETH_ADDR);
@@ -105,8 +103,8 @@ contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
         assertEq(receiver, address(3));
         assertEq(zeroForOne, false);
         assertEq(
-            uint8(TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL),
+            uint8(transferType),
-            uint8(transferType)
+            uint8(RestrictTransferFrom.TransferType.Transfer)
         );
     }
 
@@ -163,7 +161,7 @@ contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
             WETH_DAI_POOL,
             BOB,
             zeroForOne,
-            uint8(TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL)
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         deal(WETH_ADDR, address(uniswapV2Exposed), amountIn);
@@ -173,59 +171,6 @@ contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
         assertGe(finalBalance, amountOut);
     }
 
-    function testSwapWithTransferFrom() public {
-        uint256 amountIn = 10 ** 18;
-        uint256 amountOut = 1847751195973566072891;
-        bool zeroForOne = false;
-        bytes memory protocolData = abi.encodePacked(
-            WETH_ADDR,
-            WETH_DAI_POOL,
-            BOB,
-            zeroForOne,
-            uint8(TokenTransfer.TransferType.TRANSFER_FROM_TO_PROTOCOL)
-        );
-
-        deal(WETH_ADDR, address(this), amountIn);
-        IERC20(WETH_ADDR).approve(address(uniswapV2Exposed), amountIn);
-
-        uniswapV2Exposed.swap(amountIn, protocolData);
-
-        uint256 finalBalance = DAI.balanceOf(BOB);
-        assertGe(finalBalance, amountOut);
-    }
-
-    function testSwapWithPermit2TransferFrom() public {
-        uint256 amountIn = 10 ** 18;
-        uint256 amountOut = 1847751195973566072891;
-        bool zeroForOne = false;
-        bytes memory protocolData = abi.encodePacked(
-            WETH_ADDR,
-            WETH_DAI_POOL,
-            ALICE,
-            zeroForOne,
-            uint8(TokenTransfer.TransferType.TRANSFER_PERMIT2_TO_PROTOCOL)
-        );
-
-        deal(WETH_ADDR, ALICE, amountIn);
-        vm.startPrank(ALICE);
-        (
-            IAllowanceTransfer.PermitSingle memory permitSingle,
-            bytes memory signature
-        ) = handlePermit2Approval(
-            WETH_ADDR, address(uniswapV2Exposed), amountIn
-        );
-
-        // Assume the permit2.approve method will be called from the TychoRouter
-        // Replicate this scenario in this test.
-        permit2.permit(ALICE, permitSingle, signature);
-
-        uniswapV2Exposed.swap(amountIn, protocolData);
-        vm.stopPrank();
-
-        uint256 finalBalance = DAI.balanceOf(ALICE);
-        assertGe(finalBalance, amountOut);
-    }
-
     function testSwapNoTransfer() public {
         uint256 amountIn = 10 ** 18;
         uint256 amountOut = 1847751195973566072891;
@@ -235,7 +180,7 @@ contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
             WETH_DAI_POOL,
             BOB,
             zeroForOne,
-            uint8(TokenTransfer.TransferType.NONE)
+            RestrictTransferFrom.TransferType.None
         );
 
         deal(WETH_ADDR, address(this), amountIn);
@@ -248,27 +193,29 @@ contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
 
     function testDecodeIntegration() public view {
         bytes memory protocolData =
-            hex"c02aaa39b223fe8d0a0e5c4f27ead9083c756cc288e6a0c2ddd26feeb64f039a2c41296fcb3f564000000000000000000000000000000000000000010000";
+            hex"c02aaa39b223fe8d0a0e5c4f27ead9083c756cc288e6a0c2ddd26feeb64f039a2c41296fcb3f564000000000000000000000000000000000000000010001";
 
         (
             IERC20 tokenIn,
             address target,
             address receiver,
             bool zeroForOne,
-            TokenTransfer.TransferType transferType
+            RestrictTransferFrom.TransferType transferType
         ) = uniswapV2Exposed.decodeParams(protocolData);
 
         assertEq(address(tokenIn), WETH_ADDR);
         assertEq(target, 0x88e6A0c2dDD26FEEb64F039a2c41296FcB3f5640);
         assertEq(receiver, 0x0000000000000000000000000000000000000001);
         assertEq(zeroForOne, false);
-        // TRANSFER = 0
+        assertEq(
-        assertEq(0, uint8(transferType));
+            uint8(transferType),
+            uint8(RestrictTransferFrom.TransferType.Transfer)
+        );
     }
 
     function testSwapIntegration() public {
         bytes memory protocolData =
-            hex"c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2a478c2975ab1ea89e8196811f51a7b7ade33eb111d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e0000";
+            loadCallDataFromFile("test_encode_uniswap_v2");
         uint256 amountIn = 10 ** 18;
         uint256 amountOut = 1847751195973566072891;
         deal(WETH_ADDR, address(uniswapV2Exposed), amountIn);
@@ -287,7 +234,7 @@ contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
             fakePool,
             BOB,
             zeroForOne,
-            uint8(TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL)
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         deal(WETH_ADDR, address(uniswapV2Exposed), amountIn);
@@ -307,7 +254,7 @@ contract UniswapV2ExecutorTest is Test, Constants, Permit2TestHelper {
             USDC_MAG7_POOL,
             BOB,
             zeroForOne,
-            uint8(TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL)
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         deal(BASE_USDC, address(uniswapV2Exposed), amountIn);

foundry/test/executors/UniswapV3Executor.t.sol

@@ -22,7 +22,7 @@ contract UniswapV3ExecutorExposed is UniswapV3Executor {
             address receiver,
             address target,
             bool zeroForOne,
-            TransferType transferType
+            RestrictTransferFrom.TransferType transferType
         )
     {
         return _decodeData(data);
@@ -71,7 +71,7 @@ contract UniswapV3ExecutorTest is Test, Constants, Permit2TestHelper {
             address(2),
             address(3),
             false,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         (
@@ -81,7 +81,7 @@ contract UniswapV3ExecutorTest is Test, Constants, Permit2TestHelper {
             address receiver,
             address target,
             bool zeroForOne,
-            TokenTransfer.TransferType transferType
+            RestrictTransferFrom.TransferType transferType
         ) = uniswapV3Exposed.decodeData(data);
 
         assertEq(tokenIn, WETH_ADDR);
@@ -92,7 +92,7 @@ contract UniswapV3ExecutorTest is Test, Constants, Permit2TestHelper {
         assertEq(zeroForOne, false);
         assertEq(
             uint8(transferType),
-            uint8(TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL)
+            uint8(RestrictTransferFrom.TransferType.Transfer)
         );
     }
 
@@ -109,7 +109,7 @@ contract UniswapV3ExecutorTest is Test, Constants, Permit2TestHelper {
             address(this),
             DAI_WETH_USV3,
             zeroForOne,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         uint256 amountOut = uniswapV3Exposed.swap(amountIn, data);
@@ -150,7 +150,7 @@ contract UniswapV3ExecutorTest is Test, Constants, Permit2TestHelper {
             WETH_ADDR,
             DAI_ADDR,
             poolFee,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL,
+            RestrictTransferFrom.TransferType.Transfer,
             address(uniswapV3Exposed)
         );
         uint256 dataOffset = 3; // some offset
@@ -184,7 +184,7 @@ contract UniswapV3ExecutorTest is Test, Constants, Permit2TestHelper {
             address(this),
             fakePool,
             zeroForOne,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL
+            RestrictTransferFrom.TransferType.Transfer
         );
 
         vm.expectRevert(UniswapV3Executor__InvalidTarget.selector);
@@ -197,7 +197,7 @@ contract UniswapV3ExecutorTest is Test, Constants, Permit2TestHelper {
         address receiver,
         address target,
         bool zero2one,
-        TokenTransfer.TransferType transferType
+        RestrictTransferFrom.TransferType transferType
     ) internal view returns (bytes memory) {
         IUniswapV3Pool pool = IUniswapV3Pool(target);
         return abi.encodePacked(

foundry/test/executors/UniswapV4Executor.t.sol

@@ -4,7 +4,6 @@ pragma solidity ^0.8.26;
 import "../../src/executors/UniswapV4Executor.sol";
 import "../TestUtils.sol";
 import "./UniswapV4Utils.sol";
-import "@src/executors/TokenTransfer.sol";
 import "@src/executors/UniswapV4Executor.sol";
 import {Constants} from "../Constants.sol";
 import {SafeCallback} from "@uniswap/v4-periphery/src/base/SafeCallback.sol";
@@ -22,7 +21,7 @@ contract UniswapV4ExecutorExposed is UniswapV4Executor {
             address tokenIn,
             address tokenOut,
             bool zeroForOne,
-            TokenTransfer.TransferType transferType,
+            RestrictTransferFrom.TransferType transferType,
             address receiver,
             UniswapV4Pool[] memory pools
         )
@@ -53,8 +52,6 @@ contract UniswapV4ExecutorTest is Constants, TestUtils {
         int24 tickSpacing1 = 60;
         uint24 pool2Fee = 1000;
         int24 tickSpacing2 = -10;
-        TokenTransfer.TransferType transferType =
-            TokenTransfer.TransferType.TRANSFER_FROM_TO_PROTOCOL;
 
         UniswapV4Executor.UniswapV4Pool[] memory pools =
             new UniswapV4Executor.UniswapV4Pool[](2);
@@ -70,14 +67,19 @@ contract UniswapV4ExecutorTest is Constants, TestUtils {
         });
 
         bytes memory data = UniswapV4Utils.encodeExactInput(
-            USDE_ADDR, USDT_ADDR, zeroForOne, transferType, ALICE, pools
+            USDE_ADDR,
+            USDT_ADDR,
+            zeroForOne,
+            RestrictTransferFrom.TransferType.Transfer,
+            ALICE,
+            pools
         );
 
         (
             address tokenIn,
             address tokenOut,
             bool zeroForOneDecoded,
-            TokenTransfer.TransferType transferTypeDecoded,
+            RestrictTransferFrom.TransferType transferType,
             address receiver,
             UniswapV4Executor.UniswapV4Pool[] memory decodedPools
         ) = uniswapV4Exposed.decodeData(data);
@@ -85,7 +87,10 @@ contract UniswapV4ExecutorTest is Constants, TestUtils {
         assertEq(tokenIn, USDE_ADDR);
         assertEq(tokenOut, USDT_ADDR);
         assertEq(zeroForOneDecoded, zeroForOne);
-        assertEq(uint8(transferTypeDecoded), uint8(transferType));
+        assertEq(
+            uint8(transferType),
+            uint8(RestrictTransferFrom.TransferType.Transfer)
+        );
         assertEq(receiver, ALICE);
         assertEq(decodedPools.length, 2);
         assertEq(decodedPools[0].intermediaryToken, USDT_ADDR);
@@ -115,7 +120,7 @@ contract UniswapV4ExecutorTest is Constants, TestUtils {
             USDE_ADDR,
             USDT_ADDR,
             true,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL,
+            RestrictTransferFrom.TransferType.Transfer,
             ALICE,
             pools
         );
@@ -172,7 +177,7 @@ contract UniswapV4ExecutorTest is Constants, TestUtils {
             USDE_ADDR,
             WBTC_ADDR,
             true,
-            TokenTransfer.TransferType.TRANSFER_TO_PROTOCOL,
+            RestrictTransferFrom.TransferType.Transfer,
             ALICE,
             pools
         );

foundry/test/executors/UniswapV4Utils.sol

@@ -8,7 +8,7 @@ library UniswapV4Utils {
         address tokenIn,
         address tokenOut,
         bool zeroForOne,
-        UniswapV4Executor.TransferType transferType,
+        RestrictTransferFrom.TransferType transferType,
         address receiver,
         UniswapV4Executor.UniswapV4Pool[] memory pools
     ) public pure returns (bytes memory) {

src/encoding/evm/constants.rs

@@ -34,11 +34,12 @@ pub static IN_TRANSFER_REQUIRED_PROTOCOLS: LazyLock<HashSet<&'static str>> = Laz
     set
 });
 
-// The protocols here are a subset of the ones defined in IN_TRANSFER_REQUIRED_PROTOCOLS. The tokens
+// The protocols here are a subset of the ones defined in IN_TRANSFER_REQUIRED_PROTOCOLS. The in
-// can not be sent directly from the previous pool into a pool of this protocol. The tokens need to
+// transfer needs to be performed inside the callback logic. This means, the tokens can not be sent
-// be sent to the router and only then transferred into the pool. This is the case for uniswap v3
+// directly from the previous pool into a pool of this protocol. The tokens need to be sent to the
-// because of the callback logic. The only way for this to work it would be to call the second swap
+// router and only then transferred into the pool. This is the case for uniswap v3 because of the
-// during the callback of the first swap. This is currently not supported.
+// callback logic. The only way for this to work it would be to call the second swap during the
+// callback of the first swap. This is currently not supported.
 pub static CALLBACK_CONSTRAINED_PROTOCOLS: LazyLock<HashSet<&'static str>> = LazyLock::new(|| {
     let mut set = HashSet::new();
     set.insert("uniswap_v3");

src/encoding/evm/strategy_encoder/strategy_encoders.rs

@@ -33,6 +33,7 @@ use crate::encoding::{
 /// * `selector`: String, the selector for the swap function in the router contract
 /// * `router_address`: Address of the router to be used to execute swaps
 /// * `transfer_optimization`: TransferOptimization, responsible for optimizing the token transfers
+/// * `token_in_already_in_router`: bool, whether the token in is already in the router
 #[derive(Clone)]
 pub struct SingleSwapStrategyEncoder {
     swap_encoder_registry: SwapEncoderRegistry,
@@ -40,6 +41,7 @@ pub struct SingleSwapStrategyEncoder {
     selector: String,
     router_address: Bytes,
     transfer_optimization: TransferOptimization,
+    token_in_already_in_router: bool,
 }
 
 impl SingleSwapStrategyEncoder {
@@ -55,10 +57,10 @@ impl SingleSwapStrategyEncoder {
         } else {
             (
                 None,
-                "singleSwap(uint256,address,address,uint256,bool,bool,address,bytes)".to_string(),
+                "singleSwap(uint256,address,address,uint256,bool,bool,address,bool,bytes)"
+                    .to_string(),
             )
         };
-        let permit2_is_active = permit2.is_some();
         Ok(Self {
             permit2,
             selector,
@@ -67,10 +69,10 @@ impl SingleSwapStrategyEncoder {
             transfer_optimization: TransferOptimization::new(
                 chain.native_token()?,
                 chain.wrapped_token()?,
-                permit2_is_active,
                 token_in_already_in_router,
                 router_address,
             ),
+            token_in_already_in_router,
         })
     }
 
@@ -125,16 +127,16 @@ impl StrategyEncoder for SingleSwapStrategyEncoder {
         let swap_receiver =
             if !unwrap { solution.receiver.clone() } else { self.router_address.clone() };
 
-        let transfer_type = self
+        let transfer = self
             .transfer_optimization
-            .get_transfer_type(grouped_swap.clone(), solution.given_token.clone(), wrap, false);
+            .get_transfers(grouped_swap.clone(), solution.given_token.clone(), wrap, false);
         let encoding_context = EncodingContext {
             receiver: swap_receiver.clone(),
             exact_out: solution.exact_out,
             router_address: Some(self.router_address.clone()),
             group_token_in: grouped_swap.token_in.clone(),
             group_token_out: grouped_swap.token_out.clone(),
-            transfer_type: transfer_type.clone(),
+            transfer_type: transfer,
         };
 
         let mut grouped_protocol_data: Vec<u8> = vec![];
@@ -178,6 +180,7 @@ impl StrategyEncoder for SingleSwapStrategyEncoder {
                 wrap,
                 unwrap,
                 bytes_to_address(&solution.receiver)?,
+                !self.token_in_already_in_router,
                 swap_data,
             )
                 .abi_encode()
@@ -210,6 +213,7 @@ impl StrategyEncoder for SingleSwapStrategyEncoder {
 /// * `sequential_swap_validator`: SequentialSwapValidator, responsible for checking validity of
 ///   sequential swap solutions
 /// * `transfer_optimization`: TransferOptimization, responsible for optimizing the token transfers
+/// * `token_in_already_in_router`: bool, whether the token in is already in the router
 #[derive(Clone)]
 pub struct SequentialSwapStrategyEncoder {
     swap_encoder_registry: SwapEncoderRegistry,
@@ -220,6 +224,7 @@ pub struct SequentialSwapStrategyEncoder {
     wrapped_address: Bytes,
     sequential_swap_validator: SequentialSwapValidator,
     transfer_optimization: TransferOptimization,
+    token_in_already_in_router: bool,
 }
 
 impl SequentialSwapStrategyEncoder {
@@ -235,11 +240,10 @@ impl SequentialSwapStrategyEncoder {
         } else {
             (
                 None,
-                "sequentialSwap(uint256,address,address,uint256,bool,bool,address,bytes)"
+                "sequentialSwap(uint256,address,address,uint256,bool,bool,address,bool,bytes)"
                     .to_string(),
             )
         };
-        let permit2_is_active = permit2.is_some();
         Ok(Self {
             permit2,
             selector,
@@ -251,10 +255,10 @@ impl SequentialSwapStrategyEncoder {
             transfer_optimization: TransferOptimization::new(
                 chain.native_token()?,
                 chain.wrapped_token()?,
-                permit2_is_active,
                 token_in_already_in_router,
                 router_address,
             ),
+            token_in_already_in_router,
         })
     }
 
@@ -311,9 +315,10 @@ impl StrategyEncoder for SequentialSwapStrategyEncoder {
                 .transfer_optimization
                 .get_receiver(solution.receiver.clone(), next_swap)?;
             next_in_between_swap_optimization_allowed = next_swap_optimization;
-            let transfer_type = self
+
+            let transfer = self
                 .transfer_optimization
-                .get_transfer_type(
+                .get_transfers(
                     grouped_swap.clone(),
                     solution.given_token.clone(),
                     wrap,
@@ -325,7 +330,7 @@ impl StrategyEncoder for SequentialSwapStrategyEncoder {
                 router_address: Some(self.router_address.clone()),
                 group_token_in: grouped_swap.token_in.clone(),
                 group_token_out: grouped_swap.token_out.clone(),
-                transfer_type: transfer_type.clone(),
+                transfer_type: transfer,
             };
 
             let mut grouped_protocol_data: Vec<u8> = vec![];
@@ -374,6 +379,7 @@ impl StrategyEncoder for SequentialSwapStrategyEncoder {
                 wrap,
                 unwrap,
                 bytes_to_address(&solution.receiver)?,
+                !self.token_in_already_in_router,
                 encoded_swaps,
             )
                 .abi_encode()
@@ -406,6 +412,7 @@ impl StrategyEncoder for SequentialSwapStrategyEncoder {
 ///   solutions
 /// * `router_address`: Address of the router to be used to execute swaps
 /// * `transfer_optimization`: TransferOptimization, responsible for optimizing the token transfers
+/// * `token_in_already_in_router`: bool, whether the token in is already in the router
 #[derive(Clone)]
 pub struct SplitSwapStrategyEncoder {
     swap_encoder_registry: SwapEncoderRegistry,
@@ -416,6 +423,7 @@ pub struct SplitSwapStrategyEncoder {
     split_swap_validator: SplitSwapValidator,
     router_address: Bytes,
     transfer_optimization: TransferOptimization,
+    token_in_already_in_router: bool,
 }
 
 impl SplitSwapStrategyEncoder {
@@ -431,11 +439,10 @@ impl SplitSwapStrategyEncoder {
         } else {
             (
                 None,
-                "splitSwap(uint256,address,address,uint256,bool,bool,uint256,address,bytes)"
+                "splitSwap(uint256,address,address,uint256,bool,bool,uint256,address,bool,bytes)"
                     .to_string(),
             )
         };
-        let permit2_is_active = permit2.is_some();
         Ok(Self {
             permit2,
             selector,
@@ -447,10 +454,10 @@ impl SplitSwapStrategyEncoder {
             transfer_optimization: TransferOptimization::new(
                 chain.native_token()?,
                 chain.wrapped_token()?,
-                permit2_is_active,
                 token_in_already_in_router,
                 router_address,
             ),
+            token_in_already_in_router,
         })
     }
 
@@ -553,16 +560,16 @@ impl StrategyEncoder for SplitSwapStrategyEncoder {
             } else {
                 self.router_address.clone()
             };
-            let transfer_type = self
+            let transfer = self
                 .transfer_optimization
-                .get_transfer_type(grouped_swap.clone(), solution.given_token.clone(), wrap, false);
+                .get_transfers(grouped_swap.clone(), solution.given_token.clone(), wrap, false);
             let encoding_context = EncodingContext {
                 receiver: swap_receiver.clone(),
                 exact_out: solution.exact_out,
                 router_address: Some(self.router_address.clone()),
                 group_token_in: grouped_swap.token_in.clone(),
                 group_token_out: grouped_swap.token_out.clone(),
-                transfer_type: transfer_type.clone(),
+                transfer_type: transfer,
             };
 
             let mut grouped_protocol_data: Vec<u8> = vec![];
@@ -621,6 +628,7 @@ impl StrategyEncoder for SplitSwapStrategyEncoder {
                 unwrap,
                 U256::from(tokens_len),
                 bytes_to_address(&solution.receiver)?,
+                !self.token_in_already_in_router,
                 encoded_swaps,
             )
                 .abi_encode()
@@ -750,7 +758,7 @@ mod tests {
             let expected_min_amount_encoded = hex::encode(U256::abi_encode(&expected_min_amount));
             let expected_input = [
                 "30ace1b1",                                                             // Function selector
-                "0000000000000000000000000000000000000000000000000de0b6b3a7640000",      // amount out
+                "0000000000000000000000000000000000000000000000000de0b6b3a7640000",      // amount in
                 "000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",      // token in
                 "0000000000000000000000006b175474e89094c44da98b954eedeac495271d0f",      // token out
                 &expected_min_amount_encoded,                                            // min amount out
@@ -772,7 +780,7 @@ mod tests {
                 "a478c2975ab1ea89e8196811f51a7b7ade33eb11", // component id
                 "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2", // receiver
                 "00",                                       // zero2one
-                "02",                                       // transfer type
+                "00",                                       // transfer type TransferFrom
                 "0000000000000000000000000000",             // padding
             ));
             let hex_calldata = encode(&calldata);
@@ -839,7 +847,7 @@ mod tests {
                 .unwrap();
             let expected_min_amount_encoded = hex::encode(U256::abi_encode(&expected_min_amount));
             let expected_input = [
-                "20144a07",                                                           // Function selector
+                "5c4b639c",                                                           // Function selector
                 "0000000000000000000000000000000000000000000000000de0b6b3a7640000",   // amount in
                 "000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",   // token in
                 "0000000000000000000000006b175474e89094c44da98b954eedeac495271d0f",   // token out
@@ -847,7 +855,8 @@ mod tests {
                 "0000000000000000000000000000000000000000000000000000000000000000",   // wrap
                 "0000000000000000000000000000000000000000000000000000000000000000",   // unwrap
                 "000000000000000000000000cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2",   // receiver
-                "0000000000000000000000000000000000000000000000000000000000000100",   // offset of swap bytes
+                "0000000000000000000000000000000000000000000000000000000000000001",   // transfer from needed
+                "0000000000000000000000000000000000000000000000000000000000000120",   // offset of swap bytes
                 "0000000000000000000000000000000000000000000000000000000000000052",   // length of swap bytes without padding
 
                 // Swap data
@@ -856,8 +865,8 @@ mod tests {
                 "a478c2975ab1ea89e8196811f51a7b7ade33eb11", // component id
                 "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2", // receiver
                 "00",                                       // zero2one
-                "01",                                       // transfer type
+                "00",                                       // transfer type TransferFrom
-                "0000000000000000000000000000",               // padding
+                "0000000000000000000000000000",             // padding
             ]
                 .join("");
 
@@ -921,7 +930,7 @@ mod tests {
                 .unwrap();
             let expected_min_amount_encoded = hex::encode(U256::abi_encode(&expected_min_amount));
             let expected_input = [
-                "20144a07",                                                           // Function selector
+                "5c4b639c",                                                           // Function selector
                 "0000000000000000000000000000000000000000000000000de0b6b3a7640000",   // amount in
                 "000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",   // token in
                 "0000000000000000000000006b175474e89094c44da98b954eedeac495271d0f",   // token out
@@ -929,7 +938,8 @@ mod tests {
                 "0000000000000000000000000000000000000000000000000000000000000000",   // wrap
                 "0000000000000000000000000000000000000000000000000000000000000000",   // unwrap
                 "000000000000000000000000cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2",   // receiver
-                "0000000000000000000000000000000000000000000000000000000000000100",   // offset of swap bytes
+                "0000000000000000000000000000000000000000000000000000000000000000",   // transfer from not needed
+                "0000000000000000000000000000000000000000000000000000000000000120",   // offset of swap bytes
                 "0000000000000000000000000000000000000000000000000000000000000052",   // length of swap bytes without padding
 
                 // Swap data
@@ -938,7 +948,7 @@ mod tests {
                 "a478c2975ab1ea89e8196811f51a7b7ade33eb11", // component id
                 "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2", // receiver
                 "00",                                       // zero2one
-                "00",                                       // transfer type
+                "01",                                       // transfer type Transfer
                 "0000000000000000000000000000",             // padding
             ]
                 .join("");
@@ -1191,7 +1201,7 @@ mod tests {
             let hex_calldata = encode(&calldata);
 
             let expected = String::from(concat!(
-                "e8a980d7",                                                         /* function selector */
+                "e21dd0d3",                                                         /* function selector */
                 "0000000000000000000000000000000000000000000000000de0b6b3a7640000", // amount in
                 "000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2", // token in
                 "000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48", // token ou
@@ -1199,7 +1209,8 @@ mod tests {
                 "0000000000000000000000000000000000000000000000000000000000000000", // wrap
                 "0000000000000000000000000000000000000000000000000000000000000000", // unwrap
                 "000000000000000000000000cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2", // receiver
-                "0000000000000000000000000000000000000000000000000000000000000100", /* length ple
+                "0000000000000000000000000000000000000000000000000000000000000001", /* transfer from needed */
+                "0000000000000000000000000000000000000000000000000000000000000120", /* length ple
                                                                                      * encode */
                 "00000000000000000000000000000000000000000000000000000000000000a8",
                 // swap 1
@@ -1209,7 +1220,7 @@ mod tests {
                 "bb2b8038a1640196fbe3e38816f3e67cba72d940", // component id
                 "004375dff511095cc5a197a54140a24efef3a416", // receiver (next pool)
                 "00",                                       // zero to one
-                "01",                                       // transfer type
+                "00",                                       // transfer type TransferFrom
                 // swap 2
                 "0052",                                             // swap length
                 "5615deb798bb3e4dfa0139dfa1b3d433cc23b72f",         // executor address
@@ -1217,7 +1228,7 @@ mod tests {
                 "004375dff511095cc5a197a54140a24efef3a416",         // component id
                 "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2",         // receiver (final user)
                 "01",                                               // zero to one
-                "05",                                               // transfer type - None
+                "02",                                               // transfer type None
                 "000000000000000000000000000000000000000000000000", // padding
             ));
 
@@ -1336,7 +1347,7 @@ mod tests {
                 "3ede3eca2a72b3aecc820e955b36f38437d01395", // receiver
                 "88e6a0c2ddd26feeb64f039a2c41296fcb3f5640", // component id
                 "01",                                       // zero2one
-                "02",                                       // transfer type
+                "00",                                       // transfer type TransferFrom
                 "0069",                                     // ple encoded swaps
                 "2e234dae75c793f67a35089c9d99245e1c58470b", // executor address
                 "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2", // token in
@@ -1345,7 +1356,7 @@ mod tests {
                 "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2", // receiver
                 "8ad599c3a0ff1de082011efddc58f1908eb6e6d8", // component id
                 "00",                                       // zero2one
-                "00",                                       // transfer type
+                "01",                                       // transfer type Transfer
                 "00000000000000000000",                     // padding
             ]
                 .join("");
@@ -2062,7 +2073,7 @@ mod tests {
                 "3ede3eca2a72b3aecc820e955b36f38437d01395", // receiver
                 "88e6a0c2ddd26feeb64f039a2c41296fcb3f5640", // component id
                 "01", // zero2one
-                "02", // transfer type
+                "00", // transfer type TransferFrom
                 "006e", // ple encoded swaps
                 "00", // token in index
                 "01", // token out index
@@ -2074,7 +2085,7 @@ mod tests {
                 "3ede3eca2a72b3aecc820e955b36f38437d01395", // receiver
                 "8ad599c3a0ff1de082011efddc58f1908eb6e6d8", // component id
                 "01", // zero2one
-                "02", // transfer type
+                "00", // transfer type TransferFrom
                 "0057", // ple encoded swaps
                 "01", // token in index
                 "00", // token out index
@@ -2084,7 +2095,7 @@ mod tests {
                 "b4e16d0168e52d35cacd2c6185b44281ec28c9dc", // component id,
                 "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2", // receiver
                 "00", // zero2one
-                "00", // transfer type
+                "01", // transfer type Transfer
                 "00000000000000" // padding
             ]
                 .join("");
@@ -2224,7 +2235,7 @@ mod tests {
                 "b4e16d0168e52d35cacd2c6185b44281ec28c9dc", // component id
                 "3ede3eca2a72b3aecc820e955b36f38437d01395", // receiver
                 "01", // zero2one
-                "02", // transfer type
+                "00", // transfer type TransferFrom
                 "006e", // ple encoded swaps
                 "01", // token in index
                 "00", // token out index
@@ -2236,7 +2247,7 @@ mod tests {
                 "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2", // receiver
                 "88e6a0c2ddd26feeb64f039a2c41296fcb3f5640", // component id
                 "00", // zero2one
-                "00", // transfer type
+                "01", // transfer type Transfer
                 "006e", // ple encoded swaps
                 "01", // token in index
                 "00", // token out index
@@ -2248,7 +2259,7 @@ mod tests {
                 "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2", // receiver
                 "8ad599c3a0ff1de082011efddc58f1908eb6e6d8", // component id
                 "00", // zero2one
-                "00", // transfer type
+                "01", // transfer type Transfer
                 "00000000000000" // padding
             ]
                 .join("");
@@ -2625,7 +2636,7 @@ mod tests {
                 "a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48", // group token in
                 "6982508145454ce325ddbe47a25d4ec3d2311933", // group token in
                 "00",                                       // zero2one
-                "02",                                       // transfer type (transfer to router)
+                "00",                                       // transfer type TransferFrom
                 "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2", // receiver
                 // First pool params
                 "0000000000000000000000000000000000000000", // intermediary token (ETH)

src/encoding/evm/strategy_encoder/transfer_optimizations.rs

@@ -16,7 +16,6 @@ use crate::encoding::{
 pub struct TransferOptimization {
     native_token: Bytes,
     wrapped_token: Bytes,
-    permit2: bool,
     token_in_already_in_router: bool,
     router_address: Bytes,
 }
@@ -25,69 +24,58 @@ impl TransferOptimization {
     pub fn new(
         native_token: Bytes,
         wrapped_token: Bytes,
-        permit2: bool,
         token_in_already_in_router: bool,
         router_address: Bytes,
     ) -> Self {
         TransferOptimization {
             native_token,
             wrapped_token,
-            permit2,
             token_in_already_in_router,
             router_address,
         }
     }
 
-    /// Returns the transfer method that should be used for the given swap and solution.
+    /// Returns the transfer type that should be used for the current transfer.
-    pub fn get_transfer_type(
+    pub fn get_transfers(
         &self,
         swap: SwapGroup,
         given_token: Bytes,
         wrap: bool,
         in_between_swap_optimization: bool,
     ) -> TransferType {
+        let is_first_swap = swap.token_in == given_token;
         let in_transfer_required: bool =
             IN_TRANSFER_REQUIRED_PROTOCOLS.contains(&swap.protocol_system.as_str());
 
-        let is_first_swap = swap.token_in == given_token;
-
         if swap.token_in == self.native_token {
             // Funds are already in router. All protocols currently take care of native transfers.
             TransferType::None
         } else if (swap.token_in == self.wrapped_token) && wrap {
-            // Wrapping already happened in the router so we can just use a normal transfer.
+            // Wrapping already happened in the router so, we just do a normal transfer.
-            TransferType::TransferToProtocol
+            TransferType::Transfer
         } else if is_first_swap {
             if in_transfer_required {
                 if self.token_in_already_in_router {
                     // Transfer from router to pool.
-                    TransferType::TransferToProtocol
+                    TransferType::Transfer
-                } else if self.permit2 {
-                    // Transfer from swapper to pool using permit2.
-                    TransferType::TransferPermit2ToProtocol
                 } else {
-                    // Transfer from swapper to pool.
+                    // Transfer from swapper to pool
-                    TransferType::TransferFromToProtocol
+                    TransferType::TransferFrom
                 }
-                // in transfer is not necessary for these protocols. Only make a transfer if the
+            // in transfer is not necessary for these protocols. Only make a transfer from the
-                // tokens are not already in the router
+            // swapper to the router if the tokens are not already in the router
             } else if !self.token_in_already_in_router {
-                if self.permit2 {
+                // Transfer from swapper to router using.
-                    // Transfer from swapper to router using permit2.
+                TransferType::TransferFrom
-                    TransferType::TransferPermit2ToRouter
-                } else {
-                    // Transfer from swapper to router.
-                    TransferType::TransferFromToRouter
-                }
             } else {
                 TransferType::None
             }
-        // all other swaps
+        // all other swaps that not the first one
         } else if !in_transfer_required || in_between_swap_optimization {
             // funds should already be in the router or in the next pool
             TransferType::None
         } else {
-            TransferType::TransferToProtocol
+            TransferType::Transfer
         }
     }
 
@@ -155,146 +143,63 @@ mod tests {
         Bytes::from("0x5615deb798bb3e4dfa0139dfa1b3d433cc23b72f")
     }
 
-    #[test]
+    #[rstest]
-    fn test_first_swap_transfer_from_permit2() {
+    // First swap tests
+    // WETH -(univ2)-> DAI we expect a transfer from the user to the protocol
+    #[case(weth(), weth(), "uniswap_v2".to_string(), false, false,false, TransferType::TransferFrom)]
+    // Native token swap. No transfer is needed
+    #[case(eth(), eth(),  "uniswap_v2".to_string(),false, false,false, TransferType::None)]
+    // ETH -(wrap)-> WETH -(univ2)-> DAI. Only a transfer from the router into the protocol is
+    // needed
+    #[case(eth(), weth(),  "uniswap_v2".to_string(),true, false,false,TransferType::Transfer)]
+    // USDC -(univ2)-> DAI and the tokens are already in the router. Only a transfer from the router
+    // to the protocol is needed
+    #[case(usdc(), usdc(), "uniswap_v2".to_string(),false, true,false, TransferType::Transfer)]
+    // USDC -(curve)-> DAI and the tokens are already in the router. No transfer is needed
+    #[case(usdc(), usdc(), "vm:curve".to_string(),false, true, false,TransferType::None)]
+    // other swaps tests
+    // tokens need to be transferred into the pool
+    #[case(weth(), usdc(), "uniswap_v2".to_string(), false, false,false, TransferType::Transfer)]
+    // tokens are already in the pool (optimization)
+    #[case(weth(), usdc(), "uniswap_v2".to_string(), false, false, true, TransferType::None)]
+    // tokens are already in the router and don't need a transfer
+    #[case(weth(), usdc(), "vm:curve".to_string(), false, false, false, TransferType::None)]
+    fn test_get_transfers(
+        #[case] given_token: Bytes,
+        #[case] swap_token_in: Bytes,
+        #[case] protocol: String,
+        #[case] wrap: bool,
+        #[case] token_in_already_in_router: bool,
+        #[case] in_between_swap_optimization: bool,
+        #[case] expected_transfer: TransferType,
+    ) {
         // The swap token is the same as the given token, which is not the native token
-        let swap = SwapGroup {
+        let swaps = vec![Swap {
-            protocol_system: "uniswap_v2".to_string(),
+            component: ProtocolComponent {
-            token_in: weth(),
+                protocol_system: "uniswap_v2".to_string(),
+                id: "0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11".to_string(),
+                ..Default::default()
+            },
+            token_in: swap_token_in.clone(),
             token_out: dai(),
             split: 0f64,
-            swaps: vec![],
+        }];
-        };
-        let optimization = TransferOptimization::new(eth(), weth(), true, false, router_address());
-        let transfer_method = optimization.get_transfer_type(swap.clone(), weth(), false, false);
-        assert_eq!(transfer_method, TransferType::TransferPermit2ToProtocol);
-    }
-
-    #[test]
-    fn test_first_swap_transfer_from() {
-        // The swap token is the same as the given token, which is not the native token
         let swap = SwapGroup {
-            protocol_system: "uniswap_v2".to_string(),
+            protocol_system: protocol,
-            token_in: weth(),
+            token_in: swap_token_in,
             token_out: dai(),
             split: 0f64,
-            swaps: vec![],
+            swaps,
         };
-        let optimization = TransferOptimization::new(eth(), weth(), false, false, router_address());
+        let optimization =
-        let transfer_method = optimization.get_transfer_type(swap.clone(), weth(), false, false);
+            TransferOptimization::new(eth(), weth(), token_in_already_in_router, router_address());
-        assert_eq!(transfer_method, TransferType::TransferFromToProtocol);
+        let transfer = optimization.get_transfers(
-    }
+            swap.clone(),
-
+            given_token,
-    #[test]
+            wrap,
-    fn test_first_swap_native() {
+            in_between_swap_optimization,
-        // The swap token is the same as the given token, and it's the native token.
+        );
-        // No transfer action is needed.
+        assert_eq!(transfer, expected_transfer);
-        let swap = SwapGroup {
-            protocol_system: "uniswap_v2".to_string(),
-            token_in: eth(),
-            token_out: dai(),
-            split: 0f64,
-            swaps: vec![],
-        };
-        let optimization = TransferOptimization::new(eth(), weth(), false, false, router_address());
-        let transfer_method = optimization.get_transfer_type(swap.clone(), eth(), false, false);
-        assert_eq!(transfer_method, TransferType::None);
-    }
-
-    #[test]
-    fn test_first_swap_wrapped() {
-        // The swap token is NOT the same as the given token, but we are wrapping.
-        // Since the swap's token in is the wrapped token - this is the first swap.
-        let swap = SwapGroup {
-            protocol_system: "uniswap_v2".to_string(),
-            token_in: weth(),
-            token_out: dai(),
-            split: 0f64,
-            swaps: vec![],
-        };
-        let optimization = TransferOptimization::new(eth(), weth(), false, false, router_address());
-        let transfer_method = optimization.get_transfer_type(swap.clone(), eth(), true, false);
-        assert_eq!(transfer_method, TransferType::TransferToProtocol);
-    }
-
-    #[test]
-    fn test_not_first_swap() {
-        // The swap token is NOT the same as the given token, and we are NOT wrapping.
-        // Thus, this is not the first swap.
-        let swap = SwapGroup {
-            protocol_system: "uniswap_v2".to_string(),
-            token_in: usdc(),
-            token_out: dai(),
-            split: 0f64,
-            swaps: vec![],
-        };
-        let optimization = TransferOptimization::new(eth(), weth(), false, false, router_address());
-        let transfer_method = optimization.get_transfer_type(swap.clone(), weth(), false, false);
-        assert_eq!(transfer_method, TransferType::TransferToProtocol);
-    }
-
-    #[test]
-    fn test_not_first_swap_funds_in_router() {
-        // Not the first swap and the protocol requires the funds to be in the router (which they
-        // already are, so the transfer type is None)
-        let swap = SwapGroup {
-            protocol_system: "vm:curve".to_string(),
-            token_in: usdc(),
-            token_out: dai(),
-            split: 0f64,
-            swaps: vec![],
-        };
-        let optimization = TransferOptimization::new(eth(), weth(), false, false, router_address());
-        let transfer_method = optimization.get_transfer_type(swap.clone(), weth(), false, false);
-        assert_eq!(transfer_method, TransferType::None);
-    }
-
-    #[test]
-    fn test_not_first_swap_in_between_swap_optimization() {
-        // Not the first swap and the in between swaps are optimized. The funds should already be in
-        // the next pool or in the router
-        let swap = SwapGroup {
-            protocol_system: "uniswap_v2".to_string(),
-            token_in: usdc(),
-            token_out: dai(),
-            split: 0f64,
-            swaps: vec![],
-        };
-        let optimization = TransferOptimization::new(eth(), weth(), false, false, router_address());
-        let transfer_method = optimization.get_transfer_type(swap.clone(), weth(), false, true);
-        assert_eq!(transfer_method, TransferType::None);
-    }
-
-    #[test]
-    fn test_first_swap_tokens_already_in_router_optimization() {
-        // It is the first swap, tokens are already in the router and the protocol requires the
-        // transfer in
-        let swap = SwapGroup {
-            protocol_system: "uniswap_v2".to_string(),
-            token_in: usdc(),
-            token_out: dai(),
-            split: 0f64,
-            swaps: vec![],
-        };
-        let optimization = TransferOptimization::new(eth(), weth(), false, true, router_address());
-        let transfer_method = optimization.get_transfer_type(swap.clone(), usdc(), false, false);
-        assert_eq!(transfer_method, TransferType::TransferToProtocol);
-    }
-
-    #[test]
-    fn test_first_swap_tokens_already_in_router_no_transfer_needed_optimization() {
-        // It is the first swap, tokens are already in the router and the protocol does not require
-        // the transfer in
-        let swap = SwapGroup {
-            protocol_system: "vm:curve".to_string(),
-            token_in: usdc(),
-            token_out: dai(),
-            split: 0f64,
-            swaps: vec![],
-        };
-        let optimization = TransferOptimization::new(eth(), weth(), false, true, router_address());
-        let transfer_method = optimization.get_transfer_type(swap.clone(), usdc(), false, false);
-        assert_eq!(transfer_method, TransferType::None);
     }
 
     fn receiver() -> Bytes {
@@ -319,7 +224,7 @@ mod tests {
         #[case] expected_receiver: Bytes,
         #[case] expected_optimization: bool,
     ) {
-        let optimization = TransferOptimization::new(eth(), weth(), false, false, router_address());
+        let optimization = TransferOptimization::new(eth(), weth(), false, router_address());
 
         let next_swap = if protocol.is_none() {
             None

src/encoding/evm/swap_encoder/swap_encoders.rs

@@ -592,7 +592,7 @@ mod tests {
         #[test]
         fn test_encode_uniswap_v2() {
             let usv2_pool = ProtocolComponent {
-                id: String::from("0x88e6A0c2dDD26FEEb64F039a2c41296FcB3f5640"),
+                id: String::from("0xA478c2975Ab1Ea89e8196811F51A7B7Ade33eB11"),
                 ..Default::default()
             };
 
@@ -605,12 +605,12 @@ mod tests {
                 split: 0f64,
             };
             let encoding_context = EncodingContext {
-                receiver: Bytes::from("0x0000000000000000000000000000000000000001"),
+                receiver: Bytes::from("0x1D96F2f6BeF1202E4Ce1Ff6Dad0c2CB002861d3e"), // BOB
                 exact_out: false,
                 router_address: Some(Bytes::zero(20)),
                 group_token_in: token_in.clone(),
                 group_token_out: token_out.clone(),
-                transfer_type: TransferType::TransferToProtocol,
+                transfer_type: TransferType::Transfer,
             };
             let encoder = UniswapV2SwapEncoder::new(
                 String::from("0x543778987b293C7E8Cf0722BB2e935ba6f4068D4"),
@@ -628,15 +628,16 @@ mod tests {
                     // in token
                     "c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
                     // component id
-                    "88e6a0c2ddd26feeb64f039a2c41296fcb3f5640",
+                    "a478c2975ab1ea89e8196811f51a7b7ade33eb11",
                     // receiver
-                    "0000000000000000000000000000000000000001",
+                    "1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e",
                     // zero for one
                     "00",
-                    // transfer type (transfer)
+                    // transfer type Transfer
-                    "00",
+                    "01",
                 ))
             );
+            write_calldata_to_file("test_encode_uniswap_v2", hex_swap.as_str());
         }
     }
 
@@ -668,7 +669,7 @@ mod tests {
                 router_address: Some(Bytes::zero(20)),
                 group_token_in: token_in.clone(),
                 group_token_out: token_out.clone(),
-                transfer_type: TransferType::TransferToProtocol,
+                transfer_type: TransferType::Transfer,
             };
             let encoder = UniswapV3SwapEncoder::new(
                 String::from("0x543778987b293C7E8Cf0722BB2e935ba6f4068D4"),
@@ -695,8 +696,8 @@ mod tests {
                     "88e6a0c2ddd26feeb64f039a2c41296fcb3f5640",
                     // zero for one
                     "00",
-                    // transfer type (transfer)
+                    // transfer type Transfer
-                    "00",
+                    "01",
                 ))
             );
         }
@@ -759,8 +760,8 @@ mod tests {
                     "1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e",
                     // approval needed
                     "01",
-                    // transfer type
+                    // transfer type None
-                    "05"
+                    "02"
                 ))
             );
             write_calldata_to_file("test_encode_balancer_v2", hex_swap.as_str());
@@ -804,7 +805,7 @@ mod tests {
 
                 group_token_in: token_in.clone(),
                 group_token_out: token_out.clone(),
-                transfer_type: TransferType::TransferToProtocol,
+                transfer_type: TransferType::Transfer,
             };
             let encoder = UniswapV4SwapEncoder::new(
                 String::from("0xF62849F9A0B5Bf2913b396098F7c7019b51A820a"),
@@ -826,8 +827,8 @@ mod tests {
                     "dac17f958d2ee523a2206206994597c13d831ec7",
                     // zero for one
                     "01",
-                    // transfer type
+                    // transfer type Transfer
-                    "00",
+                    "01",
                     // receiver
                     "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2",
                     // pool params:
@@ -875,7 +876,7 @@ mod tests {
                 group_token_in: group_token_in.clone(),
                 // Token out is the same as the group token out
                 group_token_out: token_out.clone(),
-                transfer_type: TransferType::TransferToProtocol,
+                transfer_type: TransferType::Transfer,
             };
 
             let encoder = UniswapV4SwapEncoder::new(
@@ -918,7 +919,7 @@ mod tests {
                 router_address: Some(router_address.clone()),
                 group_token_in: usde_address.clone(),
                 group_token_out: wbtc_address.clone(),
-                transfer_type: TransferType::TransferToProtocol,
+                transfer_type: TransferType::Transfer,
             };
 
             // Setup - First sequence: USDE -> USDT
@@ -996,8 +997,8 @@ mod tests {
                     "2260fac5e5542a773aa44fbcfedf7c193bc2c599",
                     // zero for one
                     "01",
-                    // transfer type
+                    // transfer type Transfer
-                    "00",
+                    "01",
                     // receiver
                     "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2",
                     // pool params:
@@ -1053,7 +1054,7 @@ mod tests {
                 group_token_out: token_out.clone(),
                 exact_out: false,
                 router_address: Some(Bytes::default()),
-                transfer_type: TransferType::TransferToProtocol,
+                transfer_type: TransferType::Transfer,
             };
 
             let encoder =
@@ -1069,8 +1070,8 @@ mod tests {
             assert_eq!(
                 hex_swap,
                 concat!(
-                    // transfer type
+                    // transfer type Transfer
-                    "00",
+                    "01",
                     // receiver
                     "ca4f73fe97d0b987a0d12b39bbd562c779bab6f6",
                     // group token in
@@ -1099,7 +1100,7 @@ mod tests {
                 group_token_out: group_token_out.clone(),
                 exact_out: false,
                 router_address: Some(Bytes::default()),
-                transfer_type: TransferType::TransferToProtocol,
+                transfer_type: TransferType::Transfer,
             };
 
             let first_swap = Swap {
@@ -1149,8 +1150,8 @@ mod tests {
                 combined_hex,
                 // transfer type
                 concat!(
-                    // transfer type
+                    // transfer type Transfer
-                    "00",
+                    "01",
                     // receiver
                     "ca4f73fe97d0b987a0d12b39bbd562c779bab6f6",
                     // group token in
@@ -1332,10 +1333,10 @@ mod tests {
                     "01",
                     // approval needed
                     "01",
-                    // transfer type
+                    // transfer type None
-                    "05",
+                    "02",
                     // receiver,
-                    "1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e"
+                    "1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e",
                 ))
             );
         }
@@ -1403,10 +1404,10 @@ mod tests {
                     "00",
                     // approval needed
                     "01",
-                    // transfer type
+                    // transfer type None
-                    "05",
+                    "02",
                     // receiver
-                    "1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e"
+                    "1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e",
                 ))
             );
         }
@@ -1484,10 +1485,10 @@ mod tests {
                     "01",
                     // approval needed
                     "01",
-                    // transfer type
+                    // transfer type None
-                    "05",
+                    "02",
                     // receiver
-                    "1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e"
+                    "1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e",
                 ))
             );
         }
@@ -1516,7 +1517,7 @@ mod tests {
             router_address: Some(Bytes::default()),
             group_token_in: token_in.clone(),
             group_token_out: token_out.clone(),
-            transfer_type: TransferType::TransferToProtocol,
+            transfer_type: TransferType::Transfer,
         };
         let encoder = MaverickV2SwapEncoder::new(
             String::from("0x543778987b293C7E8Cf0722BB2e935ba6f4068D4"),
@@ -1539,8 +1540,8 @@ mod tests {
                 "14Cf6D2Fe3E1B326114b07d22A6F6bb59e346c67",
                 // receiver
                 "1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e",
-                // transfer from router to protocol
+                // transfer true
-                "00",
+                "01",
             ))
             .to_lowercase()
         );

src/encoding/evm/tycho_encoders.rs

@@ -6,7 +6,7 @@ use tycho_common::Bytes;
 use crate::encoding::{
     errors::EncodingError,
     evm::{
-        constants::GROUPABLE_PROTOCOLS,
+        constants::{GROUPABLE_PROTOCOLS, IN_TRANSFER_REQUIRED_PROTOCOLS},
         group_swaps::group_swaps,
         strategy_encoder::strategy_encoders::{
             SequentialSwapStrategyEncoder, SingleSwapStrategyEncoder, SplitSwapStrategyEncoder,
@@ -273,13 +273,20 @@ impl TychoExecutorEncoder {
 
         let mut grouped_protocol_data: Vec<u8> = vec![];
         for swap in grouped_swap.swaps.iter() {
+            let transfer = if IN_TRANSFER_REQUIRED_PROTOCOLS
+                .contains(&swap.component.protocol_system.as_str())
+            {
+                TransferType::Transfer
+            } else {
+                TransferType::None
+            };
             let encoding_context = EncodingContext {
                 receiver: receiver.clone(),
                 exact_out: solution.exact_out,
                 router_address: None,
                 group_token_in: grouped_swap.token_in.clone(),
                 group_token_out: grouped_swap.token_out.clone(),
-                transfer_type: TransferType::TransferToProtocol,
+                transfer_type: transfer,
             };
             let protocol_data = swap_encoder.encode_swap(swap.clone(), encoding_context.clone())?;
             grouped_protocol_data.extend(protocol_data);
@@ -461,7 +468,7 @@ mod tests {
                 Bytes::from_str("0x3ede3eca2a72b3aecc820e955b36f38437d01395").unwrap()
             );
             // single swap selector
-            assert_eq!(&hex::encode(transactions[0].clone().data)[..8], "20144a07");
+            assert_eq!(&hex::encode(transactions[0].clone().data)[..8], "5c4b639c");
         }
 
         #[test]
@@ -486,7 +493,7 @@ mod tests {
             let transactions = transactions.unwrap();
             assert_eq!(transactions.len(), 1);
             // single swap selector
-            assert_eq!(&hex::encode(transactions[0].clone().data)[..8], "20144a07");
+            assert_eq!(&hex::encode(transactions[0].clone().data)[..8], "5c4b639c");
         }
 
         #[test]
@@ -533,7 +540,7 @@ mod tests {
             assert_eq!(transactions.len(), 1);
             assert_eq!(transactions[0].value, eth_amount_in);
             // sequential swap selector
-            assert_eq!(&hex::encode(transactions[0].clone().data)[..8], "e8a980d7");
+            assert_eq!(&hex::encode(transactions[0].clone().data)[..8], "e21dd0d3");
         }
 
         #[test]
@@ -1059,8 +1066,8 @@ mod tests {
                     "1d96f2f6bef1202e4ce1ff6dad0c2cb002861d3e",
                     // zero for one
                     "00",
-                    // transfer type
+                    // transfer true
-                    "00",
+                    "01",
                 ))
             );
         }
@@ -1147,8 +1154,8 @@ mod tests {
                     "6982508145454ce325ddbe47a25d4ec3d2311933",
                     // zero for one
                     "00",
-                    // transfer type
+                    // transfer type Transfer
-                    "00",
+                    "01",
                     // receiver
                     "cd09f75e2bf2a4d11f3ab23f1389fcc1621c0cc2",
                     // first pool intermediary token (ETH)

src/encoding/models.rs

@@ -96,27 +96,6 @@ pub struct Transaction {
     pub data: Vec<u8>,
 }
 
-/// Represents the type of transfer to be performed into the pool.
-///
-/// # Fields
-///
-/// * `TransferToProtocol`: Transfer the token from the router into the protocol.
-/// * `TransferFromToProtocol`: Transfer the token from the sender to the protocol.
-/// * `TransferPermit2ToProtocol`: Transfer the token from the sender to the protocol using Permit2.
-/// * `TransferFromToRouter`: Transfer the token from the sender to the router.
-/// * `TransferPermit2ToRouter`: Transfer the token from the sender to the router using Permit2.
-/// * `None`: No transfer is needed. Tokens are already in the pool.
-#[repr(u8)]
-#[derive(Clone, Debug, PartialEq)]
-pub enum TransferType {
-    TransferToProtocol = 0,
-    TransferFromToProtocol = 1,
-    TransferPermit2ToProtocol = 2,
-    TransferFromToRouter = 3,
-    TransferPermit2ToRouter = 4,
-    None = 5,
-}
-
 /// Represents necessary attributes for encoding an order.
 ///
 /// # Fields
@@ -127,6 +106,7 @@ pub enum TransferType {
 ///   solution does not require router address.
 /// * `group_token_in`: Token to be used as the input for the group swap.
 /// * `group_token_out`: Token to be used as the output for the group swap.
+/// * `transfer`: Type of transfer to be performed. See `TransferType` for more details.
 #[derive(Clone, Debug)]
 pub struct EncodingContext {
     pub receiver: Bytes,
@@ -137,6 +117,21 @@ pub struct EncodingContext {
     pub transfer_type: TransferType,
 }
 
+/// Represents the type of transfer to be performed into the pool.
+///
+/// # Fields
+///
+/// * `TransferFrom`: Transfer the token from the sender to the protocol/router.
+/// * `Transfer`: Transfer the token from the router into the protocol.
+/// * `None`: No transfer is needed. Tokens are already in the pool.
+#[repr(u8)]
+#[derive(Clone, Debug, PartialEq)]
+pub enum TransferType {
+    TransferFrom = 0,
+    Transfer = 1,
+    None = 2,
+}
+
 #[derive(Clone, PartialEq, Eq, Hash)]
 pub struct Chain {
     pub id: u64,