diff --git a/src/components/DiagonalOrder.vue b/src/components/DiagonalOrder.vue
index ec94301..baed84a 100644
--- a/src/components/DiagonalOrder.vue
+++ b/src/components/DiagonalOrder.vue
@@ -4,31 +4,43 @@
     <div class="title">Line Point A</div>
     <v-divider/>
     <time-entry v-model="time1" class="mb-0" hide-details="true"/>
-    <limit-price v-model="price1" label="Price A" :required="true"/>
+    <limit-price v-model="price1" label="Price A" :required="true" :show-price="false"/>
     <div class="title">Line Point B</div>
     <v-divider/>
     <time-entry v-model="time2" hide-details="true"/>
-    <limit-price v-model="price2" label="Price B" :required="true"/>
-    <div><i>Backend support for diagonal lines is coming soon...</i></div>
+    <limit-price v-model="price2" label="Price B" :required="true" :show-price="false"/>
+    <div v-if="curLimit">
+      <v-row>
+        <v-col cols="6">
+          <span>Current line value</span>&nbsp;<span class="text-green">{{curLimit ? curLimit.toPrecision(5) : curLimit}}</span>
+        </v-col>
+        <v-col cols="6">
+          <span>Current price</span>&nbsp;<route-price class="text-green"/>
+        </v-col>
+      </v-row>
+    </div>
+    {{os.limitIsMinimum}}
   </order>
 </template>
 
 <script setup>
-import {useOrderStore} from "@/store/store";
+import {useOrderStore, useStore} from "@/store/store";
 import LimitPrice from "@/components/LimitPrice.vue";
 import Order from "@/components/Order.vue";
 import {computed, ref} from "vue";
-import {applyLimit, applyLinePoints} from "@/orderbuild.js";
-import {validateRequired, validateTranches} from "@/validate.js";
-import {MAX_FRACTION, newTranche} from "@/blockchain/orderlib.js";
+import {applyLinePoints, linePointsValue} from "@/orderbuild.js";
+import {newTranche} from "@/blockchain/orderlib.js";
 import TimeEntry from "@/components/TimeEntry.vue";
+import RoutePrice from "@/components/RoutePrice.vue";
 
+const s = useStore()
 const os = useOrderStore()
 
 const time1 = ref(new Date())
 const price1 = ref(null)
 const time2 = ref(new Date())
 const price2 = ref(null)
+const curLimit = computed(()=>linePointsValue(time1.value, price1.value, time2.value, price2.value, s.time))
 
 function buildTranches() {
   const t = newTranche();
@@ -37,7 +49,7 @@ function buildTranches() {
 }
 
 function validOrder() {
-  return false
+  return time1.value && (price1.value || price1.value===0) && time2.value && (price2.value || price2.value===0)
 }
 
 </script>
diff --git a/src/components/Orders.vue b/src/components/Orders.vue
index 9d1930b..c4cb47b 100644
--- a/src/components/Orders.vue
+++ b/src/components/Orders.vue
@@ -24,8 +24,8 @@
         </suspense>
       </template>
       <template v-slot:item.avg="{ item }">
-        {{ pairPrice(item.order.tokenIn, item.order.tokenOut, vaultAddr, item.avg) }}
-        <btn v-if="pairPrice(item.order.tokenIn, item.order.tokenOut, vaultAddr, item.avg)!==''" size="small"
+        {{ pairPrice(item.order.tokenIn, item.order.tokenOut, item.avg) }}
+        <btn v-if="pairPrice(item.order.tokenIn, item.order.tokenOut, item.avg)!==''" size="small"
              variant="plain"
              @click="inverted[[vaultAddr,item.index]] = !inverted[[vaultAddr,item.index]]">
           {{ pair(item.order.tokenIn, item.order.tokenOut, vaultAddr, item.index) }}
@@ -117,7 +117,7 @@ const inverted = reactive({})
 
 
 // todo create a Price component that keeps inversion flags in the store and defaults to stablecoins as the quote
-function pairPrice(inTokenAddr, outTokenAddr, vaultAddr, price) {
+function pairPrice(inTokenAddr, outTokenAddr, price) {
   if( price === null )
     return ''
   const inToken = token(inTokenAddr)
@@ -125,7 +125,7 @@ function pairPrice(inTokenAddr, outTokenAddr, vaultAddr, price) {
   if( !inToken || !outToken )
     return ''
 
-  const decimals = outToken.decimals-inToken.decimals
+  const decimals = inToken.decimals-outToken.decimals
   if( decimals > 0 )
     price /= 10 ** decimals
   else
@@ -268,11 +268,14 @@ function describeTrancheTime(st, isStart, t) {
 }
 
 function describeTrancheLine(st, isMin, b, m) {
-  if( b===0 && m===0 ) return ''
-  // todo slopes
-  console.log('tranche line', isMin, b, m)
   // todo make this a PairPrice
-  return (isMin === st.order.amountIsInput ? 'dont-chase ' : 'limit ') + pairPrice(st.order.tokenIn, st.order.tokenOut, s.vault, b)
+  if( b===0 && m===0 ) return ''
+  // console.log('tranche line', isMin, b, m)
+  if( m !== 0 ) {
+    const limit = b + m * s.time
+    return 'diagonal ' + pairPrice(st.order.tokenIn, st.order.tokenOut, limit)
+  }
+  return (isMin === st.order.amountIsInput ? 'dont-chase ' : 'limit ') + pairPrice(st.order.tokenIn, st.order.tokenOut, b)
 }
 
 </script>
diff --git a/src/components/PairPrice.vue b/src/components/PairPrice.vue
new file mode 100644
index 0000000..8ef4760
--- /dev/null
+++ b/src/components/PairPrice.vue
@@ -0,0 +1,45 @@
+<template>
+  <span>{{adjValue}}</span>
+<!--  todo optional pair label and inversion button -->
+</template>
+
+<script setup>
+import {usePrefStore, useStore} from "@/store/store";
+import {computed} from "vue";
+import {token} from "@/blockchain/token.js";
+
+const props = defineProps(['value','tokenA','tokenB','addrA','addrB',])
+
+const s = useStore()
+const prefs = usePrefStore()
+
+const adjValue = computed(()=>{
+  const a = props.tokenA ? props.tokenA : token(s.chainId,props.addrA)
+  const b = props.tokenB ? props.tokenB : token(s.chainId,props.addrB)
+  if( !a || !b )
+    return ''
+  let price = props.value
+  const decimals = b.decimals-a.decimals
+  if( decimals > 0 )
+    price /= 10 ** decimals
+  else
+    price *= 10 ** -decimals
+  const token0 = a.address < b.address ? a.address : b.address
+  const token1 = a.address > b.address ? a.address : b.address
+  const invertedKey = [token0, token1];
+  if( !(invertedKey in prefs.inverted) ) {
+    // todo prefer stablecoins as the quote asset
+    prefs.inverted[invertedKey] = false
+  }
+  if( prefs.inverted[invertedKey] )
+    price = 1/price
+  return price.toPrecision(5)
+})
+
+
+</script>
+
+<style scoped lang="scss">
+@use "src/styles/vars" as *;
+
+</style>
diff --git a/src/components/RoutePrice.vue b/src/components/RoutePrice.vue
index 10aec7a..5209364 100644
--- a/src/components/RoutePrice.vue
+++ b/src/components/RoutePrice.vue
@@ -3,24 +3,27 @@
 </template>
 
 <script setup>
-import {useStore} from "@/store/store";
+import {useOrderStore, useStore} from "@/store/store";
 import {subPrices, unsubPrices, WIDE_PRICE_FORMAT} from "@/blockchain/prices.js";
 import {computed, onBeforeUnmount} from "vue";
 import {FixedNumber} from "ethers";
+import {routeInverted} from "@/misc.js";
 
 const s = useStore()
+const os = useOrderStore()
 
 const props = defineProps({
-  route: {type: Object, required:true},
-  inverted: {type: Boolean, required:true},
+  route: {type: Object, required:false},
+  inverted: {type: Boolean, required:false},
   precision: {type: Number, default:5, required:false},
 })
 
+const route = computed(()=>props.route ? props.route : os.route)
+
 const price = computed(()=>{
-  const route = props.route;
-  if( !route )
+  if( !route.value )
     return ''
-  const routeKey = [route.chainId, route.pool]
+  const routeKey = [route.value.chainId, route.value.pool]
   if( !(routeKey in s.poolPrices) )
     return ''
   let p = s.poolPrices[routeKey]
@@ -28,19 +31,20 @@ const price = computed(()=>{
   if( !p )
     return ''
   p = FixedNumber.fromString(p, WIDE_PRICE_FORMAT).toUnsafeFloat()
-  if( props.inverted )
+  const inverted = props.inverted === undefined ? routeInverted(route.value) : props.inverted;
+  if( inverted )
     p = 1/p
   return p.toPrecision(props.precision)
 })
 
-if( props.route )
-  subPrices([props.route])
+if( route.value )
+  subPrices([route.value])
 else
   console.log('route is empty: no price')
 
 onBeforeUnmount(() => {
-  if( props.route )
-    unsubPrices([props.route])
+  if( route.value )
+    unsubPrices([route.value])
 })
 
 
diff --git a/src/components/TimeEntry.vue b/src/components/TimeEntry.vue
index 14ace6e..60e30b4 100644
--- a/src/components/TimeEntry.vue
+++ b/src/components/TimeEntry.vue
@@ -30,7 +30,18 @@ const year = computed({
   set(v) { update(v, month.value, day.value, time.value)},
 })
 const time = computed({
-  get() { return '' + (s.utc ? `${props.modelValue.getUTCHours()}:${props.modelValue.getUTCMinutes()}` : `${props.modelValue.getHours()}:${props.modelValue.getMinutes()}` ) },
+  get() {
+    let hour, min
+    if( s.utc ) {
+      hour = props.modelValue.getUTCHours()
+      min = props.modelValue.getUTCMinutes()
+    }
+    else {
+      hour = props.modelValue.getHours()
+      min = props.modelValue.getMinutes()
+    }
+    return hour.toString().padStart(2,'0') + ':' + min.toString().padStart(2,'0')
+  },
   set(v) { update(year.value, month.value, day.value, v) }
 })
 
@@ -45,7 +56,6 @@ const monthItems = monthsForLocale(undefined, 'short').map((v)=>{return {title:v
 
 function buildDate(y, m, d, t) {
   const [hours,minutes] = t.split(':')
-  console.log('buildDate', y, m, d, hours, minutes)
   return s.utc ? new Date(Date.UTC(y, m, d, hours, minutes))
       : new Date(y, m, d, hours, minutes);
 }
diff --git a/src/misc.js b/src/misc.js
index 25c2769..7e3f436 100644
--- a/src/misc.js
+++ b/src/misc.js
@@ -79,6 +79,8 @@ export function dateString(seconds) {
 }
 
 
-export function timestamp(date) {
+export function timestamp(date=null) {
+    if(date===null)
+        date = new Date()
     return Math.round(date.getTime() / 1000)
 }
diff --git a/src/orderbuild.js b/src/orderbuild.js
index 8978da7..f900adf 100644
--- a/src/orderbuild.js
+++ b/src/orderbuild.js
@@ -4,7 +4,7 @@ import {useOrderStore} from "@/store/store.js";
 import {encodeIEE754} from "@/blockchain/common.js";
 
 
-export function applyLimit(tranche, price=null, isAbove=null) {
+export function applyLimit(tranche, price=null, isMinimum=null) {
     if( price === null ) {
         const os = useOrderStore()
         price = os.limitPrice
@@ -12,38 +12,62 @@ export function applyLimit(tranche, price=null, isAbove=null) {
             return
     }
 
-    applyLine(tranche, price, 0, isAbove)
+    applyLine(tranche, price, 0, isMinimum)
 }
 
 
-export function applyLinePoints(tranche, date0, price0, date1, price1, isAbove=null) {
-    const os = useOrderStore()
-    if( !date0 || !price0 && price0!==0 || !date1 || !price1 && price1!==0 )
-        return
-
+function computeInterceptSlope(date0, price0, date1, price1) {
+    if (!date0 || !price0 && price0 !== 0 || !date1 || !price1 && price1 !== 0)
+        throw Error(`invalid line points data ${date0} ${price0} ${date1} ${price1}`)
     const t0 = timestamp(date0);
     const t1 = timestamp(date1);
-    const slope = (price1-price0)/(t1-t0)
+    if (t0 === t1)
+        throw Error("line points' times must be different")
+    const slope = (price1 - price0) / (t1 - t0)
     const intercept = price1 - slope * t1
-    applyLine(tranche, intercept, slope, isAbove)
+    return [intercept, slope]
 }
 
 
-export function applyLine(tranche, intercept, slope, isAbove=null) {
+export function linePointsValue(date0, price0, date1, price1, unixTime=null) {
+    if(unixTime===null)
+        unixTime = timestamp()
+    try {
+        const [intercept, slope] = computeInterceptSlope(date0, price0, date1, price1)
+        return intercept + unixTime * slope
+    }
+    catch (e) {
+        return null
+    }
+}
+
+
+export function applyLinePoints(tranche, date0, price0, date1, price1, isMinimum=null) {
+    const [intercept, slope] = computeInterceptSlope(date0, price0, date1, price1);
+    applyLine(tranche, intercept, slope, isMinimum)
+}
+
+
+export function applyLine(tranche, intercept, slope, isMinimum=null) {
+    console.log('intercept, slope', intercept, slope)
     // intercept and slope are still in "human" units of decimal-adjusted prices
     const os = useOrderStore()
     const route = os.route
     const inverted = routeInverted(route)
     const scale = 10 ** (os.tokenA.decimals - os.tokenB.decimals)
-    const m = encodeIEE754(inverted ? scale / slope : slope / scale)
-    const b = encodeIEE754(inverted ? scale / intercept : intercept / scale)
-    if( isAbove === null )
-        isAbove = os.limitIsMinimum ^ inverted
-    if( isAbove ) {
+    let m = inverted ? -scale / slope : slope / scale
+    let b = inverted ? scale / intercept : intercept / scale
+    const cur = b + timestamp() * m
+    console.log('inverted b, m, cur', inverted, b, m, cur)
+    m = encodeIEE754(m)
+    b = encodeIEE754(b)
+    if( isMinimum === null )
+        isMinimum = os.limitIsMinimum
+    console.log('limit is minimum', isMinimum)
+    if (isMinimum) {
         tranche.minIntercept = b;
         tranche.minSlope = m;
-    }
-    else {
+    } else {
         tranche.maxIntercept = b;
         tranche.maxSlope = m;
     }
diff --git a/src/socket.js b/src/socket.js
index dc7ee26..f8738c8 100644
--- a/src/socket.js
+++ b/src/socket.js
@@ -39,10 +39,8 @@ socket.on('vb', async (chainId, vault, balances) => {
     if( s.chainId.value !== chainId )
         return
     console.log('vb', vault, balances)
-    const vb = {}
-    vb[vault] = JSON.parse(balances)
-    s.$patch({vaultBalances:vb})
-    console.log('vault balances', vault, vb)
+    s.vaultBalances[vault] = JSON.parse(balances)
+    console.log('vault balances', vault, s.vaultBalances[vault])
 })
 
 socket.on('vaults', (chainId, owner, vaults)=>{
diff --git a/src/store/store.js b/src/store/store.js
index a2dc2e8..f9ab477 100644
--- a/src/store/store.js
+++ b/src/store/store.js
@@ -2,6 +2,7 @@
 import { defineStore } from 'pinia'
 import {knownTokens} from "@/knownTokens.js";
 import {computed, ref} from "vue";
+import {timestamp} from "@/misc.js";
 
 
 // USING THE STORE:
@@ -29,6 +30,14 @@ import {computed, ref} from "vue";
 
 
 export const useStore = defineStore('app', ()=> {
+  const time = ref(timestamp())
+  console.log('starting clock')
+  setInterval(()=>{
+    const now = timestamp();
+    // console.log('clock', now)
+    time.value= now
+  }, 10*1000)
+
   const nav = ref(false) // controls opening navigation drawer
 
   const _chainId = ref(null)
@@ -111,7 +120,7 @@ export const useStore = defineStore('app', ()=> {
   return {
     nav, chainId, chainInfo, chain, provider, vaultInitCodeHash, account, vaults, transactionSenders, errors,
     extraTokens, poolPrices, vaultBalances, orders, vault, tokens, factory, helper, mockenv, mockCoins,
-    removeTransactionSender, error, closeError, addToken,
+    removeTransactionSender, error, closeError, addToken, time,
   }
 })
 
@@ -168,3 +177,12 @@ export const useOrderStore = defineStore('order', ()=> {
     limitIsMinimum, amountToken, amountIsInput, setDefaultTokens, totalAmount, trancheAmount, utc,
   }
 })
+
+
+export const usePrefStore = defineStore('order', ()=> {
+  // user preferences
+  const inverted = ref({})
+
+  return {inverted,}
+})
+
diff --git a/src/views/VaultView.vue b/src/views/VaultView.vue
index c92d076..95b3c40 100644
--- a/src/views/VaultView.vue
+++ b/src/views/VaultView.vue
@@ -2,6 +2,7 @@
   <!-- todo needs account -->
   <needs-signer>
     <vault :owner="s.account" :num="0"/>
+    <new-order class="my-6"/>
     <faucet class="mt-3"/>
   </needs-signer>
 </template>
@@ -12,6 +13,7 @@ import Vault from "@/components/Vault.vue";
 import NeedsSigner from "@/components/NeedsSigner.vue";
 import Faucet from "@/components/Faucet.vue";
 import NeedsProvider from "@/components/NeedsProvider.vue";
+import NewOrder from "@/components/NewOrder.vue";
 
 const s = useStore()