diff --git a/src/blockchain/abi.js b/src/blockchain/abi.js
index f8de743..8bfd844 100644
--- a/src/blockchain/abi.js
+++ b/src/blockchain/abi.js
@@ -53,6 +53,6 @@ export const vaultAbi = [
     'function withdrawTo(address payable,uint256) public',
     'function withdraw(address,uint256) public',
     'function withdrawTo(address,address,uint256) public',
-    'function placeOrder((address,address,(uint8,uint24),uint256,bool,bool,uint64,(uint64,(uint8,bytes)[])[])) public',
-    'function placeOrders((address,address,(uint8,uint24),uint256,bool,bool,uint64,(uint64,(uint8,bytes)[])[])[],uint8) public',
+    'function placeOrder((address,address,(uint8,uint24),uint256,bool,bool,uint64,(uint16,(uint8,bytes)[])[])) public',
+    'function placeOrders((address,address,(uint8,uint24),uint256,bool,bool,uint64,(uint16,(uint8,bytes)[])[])[],uint8) public',
 ]
diff --git a/src/blockchain/orderlib.js b/src/blockchain/orderlib.js
index 2ce976e..85b4207 100644
--- a/src/blockchain/orderlib.js
+++ b/src/blockchain/orderlib.js
@@ -29,12 +29,12 @@ export function newOrder(tokenIn, tokenOut, exchange, fee, amount, amountIsInput
 }
 
 // struct Tranche {
-//     uint64 fraction; // 18-decimal fraction of the order amount which is available to this tranche. must be <= 1
+//     uint64 fraction;
 //     Constraint[] constraints;
 // }
 export function newTranche(amountRatio, constraints) {
     return [
-        BigInt(Math.ceil(amountRatio * 10**18)), // we use ceil to make sure the sum of tranche fractions doesn't round below 1
+        BigInt(Math.min(65535, Math.ceil(amountRatio * 65535))), // we use ceil to make sure the sum of tranche fractions doesn't round below 1
         constraints
     ]
 }
diff --git a/src/blockchain/wallet.js b/src/blockchain/wallet.js
index 7c7de7b..89a845c 100644
--- a/src/blockchain/wallet.js
+++ b/src/blockchain/wallet.js
@@ -7,7 +7,7 @@ export let provider = null
 
 export function onChainChanged(chainId) {
   chainId = Number(chainId)
-  // console.log('chain changed', chainId)
+  console.log('chain changed', chainId)
   const store = useStore()
   if( chainId !== store.chainId ) {
     store.chainId = chainId
@@ -29,8 +29,8 @@ function onAccountsChanged(accounts) {
   else if (accounts[0] !== store.account) {
     store.account = accounts[0].address
     flushOrders()
+    socket.emit('address', store.chainId, accounts[0].address)
   }
-  socket.emit('address', store.chainId, accounts[0].address)
 }
 
 export async function watchWallet() {
@@ -79,7 +79,7 @@ export async function connectWallet() {
 
 
 export async function pendOrder(order) {
-  console.log('order', order)
+  console.log('order', JSON.stringify(order))
   const s = useStore()
   s.pendingOrders.push(order)
   const signer = await connectWallet()
@@ -98,18 +98,40 @@ export function flushOrders() {
 export async function asyncFlushOrders() {
   const s = useStore()
   const orders = s.pendingOrders
-  if(!orders.length || !s.account)
+  if (!orders.length)
     return
-  const contract = await vaultContract(0, await provider.getSigner())
-  if( !contract )
+  let signer
+  try {
+    signer = await provider.getSigner();
+  } catch (e) {
+    console.log('signer denied')
     return
-  const proms = []
+  }
+  const contract = await vaultContract(0, signer)
+  if (!contract) {
+    console.error(`no contract for vault 0 of ${signer.address}`)
+    return
+  }
   for (const order of orders)
-    proms.push(contract.placeOrder(order))
-  s.pendingOrders = []
-  const txs = await Promise.all(proms)
-  for( const tx of txs )
+    doPlaceOrder(s, contract, order)
+}
+
+function doPlaceOrder(s, contract, order) {
+  contract.placeOrder(order).then((tx)=>{
     console.log('placed order', tx)
+    s.removePendingOrder(order)
+    tx.wait().then((tr)=>console.log('tx receipt',tr))
+  }).catch((e)=>{
+    if( e.info.error.code === 4001 ) {
+      console.log(`user rejected order`, order)
+      s.removePendingOrder(order)
+    }
+    else {
+      console.error('error placing order', order, e.reason, e.info)
+      s.removePendingOrder(order)
+      // todo retry?
+    }
+  })
 }
 
 socket.on('vaults', (vaults)=>{
diff --git a/src/components/NeedsQueryHelper.vue b/src/components/NeedsQueryHelper.vue
index 0668896..a692ddd 100644
--- a/src/components/NeedsQueryHelper.vue
+++ b/src/components/NeedsQueryHelper.vue
@@ -1,15 +1,19 @@
 <template>
+<!--  <v-card v-if="!s.account" prepend-icon="mdi-connection" title="Connect Wallet"-->
+<!--    text="Please connect your wallet to an Arbitrum account.">-->
+<!--    <v-card-actions><v-btn text="Connect Wallet" color="green" variant="elevated" @click="connectWallet" prepend-icon="mdi-power"/></v-card-actions>-->
+<!--  </v-card>-->
   <slot v-if="s.helper"/>
-  <v-card v-if="!s.helper" prepend-icon='mdi-reload-alert' title="Change Blockchain" text="Dexorder works only with Arbitrum. Please choose the Arbitrum blockchain in your wallet."/>
+  <v-card v-if="!s.helper" prepend-icon='mdi-reload-alert' title="Change Blockchain"
+          text="Dexorder works only with Arbitrum. Please choose the Arbitrum blockchain in your wallet."/>
 </template>
 
 <script setup>
 import {useStore} from "@/store/store";
+import {connectWallet} from "@/blockchain/wallet.js";
 
 const s = useStore()
 
-async function connect() {
-}
 </script>
 
 <style scoped lang="scss">
diff --git a/src/components/TimedOrderEntry.vue b/src/components/TimedOrderEntry.vue
index 3b499b9..64997ff 100644
--- a/src/components/TimedOrderEntry.vue
+++ b/src/components/TimedOrderEntry.vue
@@ -159,7 +159,7 @@ async function findRoute() {
   }
   catch (e) {
     routes.value = []
-    // console.log('routes exception', e)
+    console.log('routes exception', e)
     return
   }
   // todo expose all available pools
@@ -178,6 +178,7 @@ async function findRoute() {
     }
   }
   routes.value = [result]
+  console.log('found route', result)
 }
 
 const routeFinder = new SingletonCoroutine(findRoute,10)
@@ -245,7 +246,7 @@ async function placeOrder() {
   const route = routes.value[0];
   const amountToken = amountIsTokenA ? ta : tb
   const amt = FixedNumber.fromString(amount.value.toString(), {decimals: amountToken.decimals}).value
-  const amountIsInput = !buy.value ^ amountIsTokenA.value
+  const amountIsInput = amountIsTokenA.value === buy.value
 
   // build tranches
   const n = tranches.value // num tranches
diff --git a/src/main.js b/src/main.js
index 37b67a9..161bebd 100644
--- a/src/main.js
+++ b/src/main.js
@@ -16,6 +16,8 @@ import '@/styles/style.scss'
 import {watchWallet} from "@/blockchain/wallet.js";
 import "./socket.js"
 
+BigInt.prototype.toJSON = function() { return this.toString() }
+
 const app = createApp(App)
 registerPlugins(app)
 
diff --git a/src/store/store.js b/src/store/store.js
index d0cc727..a2de539 100644
--- a/src/store/store.js
+++ b/src/store/store.js
@@ -30,6 +30,9 @@ export const useStore = defineStore('app', {
     helper: (s)=>!s.chain?null:s.chain.helper,
   },
   actions: {
+    removePendingOrder(order) {
+      this.pendingOrders = this.pendingOrders.filter((v) => v !== order)
+    },
     error(title, text, closeable=true) {
       this.errors.push({title, text, closeable})
     },