From f8abe33e8240c723983bf6439d897ca4e2da5c0b Mon Sep 17 00:00:00 2001
From: woodenfurniture <125113430+woodenfurniture@users.noreply.github.com>
Date: Wed, 21 Feb 2024 09:00:55 +1100
Subject: [PATCH 1/2] fix: allow quote sell amounts to be lower than user input
 sell amount

---
 src/state/apis/swapper/helpers/validateTradeQuote.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/state/apis/swapper/helpers/validateTradeQuote.ts b/src/state/apis/swapper/helpers/validateTradeQuote.ts
index 8ba75e8ebd3..3ea934fca95 100644
--- a/src/state/apis/swapper/helpers/validateTradeQuote.ts
+++ b/src/state/apis/swapper/helpers/validateTradeQuote.ts
@@ -255,8 +255,9 @@ export const validateTradeQuote = async (
   })()
 
   // ensure the trade is not selling an amount higher than the user input
-  const invalidQuoteSellAmount =
-    inputSellAmountCryptoBaseUnit !== firstHop.sellAmountIncludingProtocolFeesCryptoBaseUnit
+  const invalidQuoteSellAmount = bn(inputSellAmountCryptoBaseUnit).gte(
+    firstHop.sellAmountIncludingProtocolFeesCryptoBaseUnit,
+  )
 
   return {
     errors: [

From 084eb2f27f75cdf73a29a7de11ddde1440fc8979 Mon Sep 17 00:00:00 2001
From: woodenfurniture <125113430+woodenfurniture@users.noreply.github.com>
Date: Wed, 21 Feb 2024 10:02:49 +1100
Subject: [PATCH 2/2] fix: fix logic, add a teeny tiny thrshold so cowswap
 works

---
 src/state/apis/swapper/helpers/validateTradeQuote.ts | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/state/apis/swapper/helpers/validateTradeQuote.ts b/src/state/apis/swapper/helpers/validateTradeQuote.ts
index 3ea934fca95..f18004f1b8e 100644
--- a/src/state/apis/swapper/helpers/validateTradeQuote.ts
+++ b/src/state/apis/swapper/helpers/validateTradeQuote.ts
@@ -254,10 +254,11 @@ export const validateTradeQuote = async (
     return false
   })()
 
-  // ensure the trade is not selling an amount higher than the user input
-  const invalidQuoteSellAmount = bn(inputSellAmountCryptoBaseUnit).gte(
-    firstHop.sellAmountIncludingProtocolFeesCryptoBaseUnit,
-  )
+  // Ensure the trade is not selling an amount higher than the user input, within a very safe threshold.
+  // Threshold is required because cowswap sometimes quotes a sell amount a teeny-tiny bit more than you input.
+  const invalidQuoteSellAmount = bn(inputSellAmountCryptoBaseUnit)
+    .times('1.0000000000001')
+    .lt(firstHop.sellAmountIncludingProtocolFeesCryptoBaseUnit)
 
   return {
     errors: [