diff --git a/.env-mock b/.env-mock
index 338e6ca..01c8fca 100644
--- a/.env-mock
+++ b/.env-mock
@@ -9,7 +9,7 @@ DEXORDER_DEPLOYMENT_42161=latest
 DEXORDER_RPC_URL_42161=http://localhost:8545
 
 # Mockchain
-DEXORDER_DEPLOYMENT_1338=latest
-DEXORDER_RPC_URL_1338=http://localhost:8545
+DEXORDER_DEPLOYMENT_31337=latest
+DEXORDER_RPC_URL_31337=http://localhost:8545
 # dev account #2
-DEXORDER_ACCOUNTS_1338=0x5de4111afa1a4b94908f83103eb1f1706367c2e68ca870fc3fb9a804cdab365a
+DEXORDER_ACCOUNTS_31337=0x5de4111afa1a4b94908f83103eb1f1706367c2e68ca870fc3fb9a804cdab365a
diff --git a/abi.js b/abi.js
index b91a9ad..423c0cc 100644
--- a/abi.js
+++ b/abi.js
@@ -1,5 +1,5 @@
-import {readFile} from './misc.js'
 import {ethers} from "ethers";
+import {readFile} from "./misc.js";
 
 const ABI_BASE_PATH = '../contract/out'
 
diff --git a/cache.js b/cache.js
index 06ae25a..c7019b5 100644
--- a/cache.js
+++ b/cache.js
@@ -48,7 +48,7 @@ export class CacheObject {
 }
 
 const blockCaches = {
-    '1338': new CacheObject('1338|latest_block'),
+    '31337': new CacheObject('31337|latest_block'),
     '42161': new CacheObject('42161|latest_block'),
 }
 
diff --git a/chain.js b/chain.js
new file mode 100644
index 0000000..dcd1bbf
--- /dev/null
+++ b/chain.js
@@ -0,0 +1,69 @@
+import fs from "fs";
+import {ethers, keccak256} from "ethers";
+import {getProvider} from "./blockchain.js";
+import {getAbi} from "./abi.js";
+
+const vaultCode = JSON.parse(fs.readFileSync('../contract/out/Vault.sol/Vault.json').toString())
+export const VAULT_INIT_CODE_HASH = keccak256(vaultCode.bytecode.object)
+console.log('VAULT_INIT_CODE_HASH', VAULT_INIT_CODE_HASH)
+
+export const chainInfo = {}
+
+const _chains = [
+    {id:42161, name:'Arbitrum'},
+    {id:31337, name:'Mock'},
+]
+
+function _setChainInfo(c, k, v) {
+    c.update(v)
+    chainInfo[c][k] = v
+}
+
+for (const chain of _chains) {
+    const path = `../contract/broadcast/Deploy.sol/${chain.id}/run-${process.env['DEXORDER_DEPLOYMENT_' + chain.id]}.json`;
+    let deployment
+    try {
+        deployment = JSON.parse(fs.readFileSync(path, 'utf8')) //null synchronous is ok we only do this once on init
+    }
+    catch {
+        console.log(`warning: could not read deployment files for ${chain.id}`)
+        continue
+    }
+    for (const tx of deployment.transactions) {
+        if (tx.contractName === 'Factory')
+            chain.factory = tx.contractAddress
+        else if (tx.contractName === 'QueryHelper')
+            chain.helper = tx.contractAddress
+        else if (tx.contractName === 'MockEnv') {
+            // set up mock coins, etc
+            if( chain.id === 31337 ) {
+                console.log('Detected MockEnv at', tx.contractAddress)
+                const mock = new ethers.Contract(tx.contractAddress, await getAbi('MockEnv'), getProvider(chain.id))
+                const coinAddr = await mock.COIN()
+                const usdAddr = await mock.USD()
+                chain.tokens = [
+                    {
+                        name: 'Mockcoin',
+                        symbol: 'MOCK',
+                        decimals: 18,
+                        icon: null,
+                        address: coinAddr,
+                    },
+                    {
+                        name: 'Universally Stable Denomination',
+                        symbol: 'USD',
+                        decimals: 6,
+                        icon: null,
+                        address: usdAddr,
+                    },
+                ]
+            }
+        }
+    }
+    if (chain.factory === undefined)
+        throw Error(`No Factory deployment found for chainId ${chain.id} ${path}`)
+    if (chain.helper === undefined)
+        throw Error(`No QueryHelper deployment found for chainId ${chain.id} ${path}`)
+    console.log('Factory', chain.factory)
+    chainInfo[chain.id] = chain
+}
diff --git a/main.js b/main.js
index c1d8ea4..3ab9860 100644
--- a/main.js
+++ b/main.js
@@ -3,7 +3,7 @@ import 'dotenv/config'
 import {lookupToken} from "./token.js";
 import {httpServer, io} from "./io.js";
 import {ensureVault, loginAddress} from "./vault.js";
-import {chainInfo, VAULT_INIT_CODE_HASH} from "./misc.js";
+import {chainInfo, VAULT_INIT_CODE_HASH} from "./chain.js";
 
 
 // setup socket.io
diff --git a/misc.js b/misc.js
index 7986bfd..f3f4cae 100644
--- a/misc.js
+++ b/misc.js
@@ -1,48 +1,4 @@
-import fs from "fs";
 import util from "util";
-import {keccak256} from "ethers";
+import fs from "fs";
 
 export const readFile = (fileName) => util.promisify(fs.readFile)(fileName, 'utf8');
-
-const vaultCode = JSON.parse(fs.readFileSync('../contract/out/Vault.sol/Vault.json').toString())
-export const VAULT_INIT_CODE_HASH = keccak256(vaultCode.bytecode.object)
-console.log('VAULT_INIT_CODE_HASH', VAULT_INIT_CODE_HASH)
-
-export const chainInfo = {}
-
-const _chains = [
-    {id:42161, name:'Arbitrum'},
-    {id:1338, name:'Mock'},
-]
-
-function _setChainInfo(c, k, v) {
-    c.update(v)
-    chainInfo[c][k] = v
-}
-
-for (const chain of _chains) {
-    const path = `../contract/broadcast/Deploy.sol/${chain.id}/run-${process.env['DEXORDER_DEPLOYMENT_' + chain.id]}.json`;
-    let deployment
-    try {
-        deployment = JSON.parse(fs.readFileSync(path, 'utf8')) //null synchronous is ok we only do this once on init
-    }
-    catch {
-        console.log(`warning: could not read deployment files for ${chain.id}`)
-        continue
-    }
-    for (const tx of deployment.transactions) {
-        if (tx.contractName === 'Factory')
-            chain.factory = tx.contractAddress
-        else if (tx.contractName === 'QueryHelper')
-            chain.helper = tx.contractAddress
-        else if (tx.contractName === 'MockEnv') {
-            // todo set up mock coins, etc
-        }
-    }
-    if (chain.factory === undefined)
-        throw Error(`No Factory deployment found for chainId ${chain.id} ${path}`)
-    if (chain.helper === undefined)
-        throw Error(`No QueryHelper deployment found for chainId ${chain.id} ${path}`)
-    console.log('Factory', chain.factory)
-    chainInfo[chain.id] = chain
-}
diff --git a/token.js b/token.js
index 4b96267..374fe28 100644
--- a/token.js
+++ b/token.js
@@ -9,7 +9,7 @@ import {getProvider} from "./blockchain.js";
 const std_arbitrum_tokens = {}
 const tokens = {
     42161: std_arbitrum_tokens,
-    1338: std_arbitrum_tokens,
+    31337: std_arbitrum_tokens,
 }
 
 export async function lookupToken(chainId, address) {
diff --git a/vault.js b/vault.js
index 3b5205b..e629bc6 100644
--- a/vault.js
+++ b/vault.js
@@ -2,7 +2,7 @@ import {ethers} from "ethers";
 import {getAbi} from "./abi.js";
 import {getProvider, getSigner} from "./blockchain.js";
 import {vaults} from './cache.js';
-import {chainInfo, VAULT_INIT_CODE_HASH} from "./misc.js";
+import {chainInfo, VAULT_INIT_CODE_HASH} from "./chain.js";
 
 // Vault
 //   address owner
@@ -50,6 +50,8 @@ export async function loginAddress(socket, chainId, address) {
 
 
 export async function ensureVault(socket, chainId, owner, num) {
+    if( !(chainId in chainInfo) )
+        return
     console.log('ensureVault', chainId, owner, num)
     const address = vaultAddress(chainId, owner, num)
     if (!await vaults.contains(chainId,address)) {