From 1516a1bf9bead1d6fd0599c911570aa4eb495825 Mon Sep 17 00:00:00 2001
From: gmbronco <83549293+gmbronco@users.noreply.github.com>
Date: Mon, 9 Sep 2024 12:25:49 +0200
Subject: [PATCH] handle SOR's effective price when outputAmount is 0 (#916)

---
 .changeset/six-pans-rhyme.md        |  5 +++++
 modules/sor/sorV2/sorPathService.ts | 10 ++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/six-pans-rhyme.md

diff --git a/.changeset/six-pans-rhyme.md b/.changeset/six-pans-rhyme.md
new file mode 100644
index 000000000..0e5f75b2f
--- /dev/null
+++ b/.changeset/six-pans-rhyme.md
@@ -0,0 +1,5 @@
+---
+'backend': patch
+---
+
+handle SOR's effective price when outputAmount is 0
diff --git a/modules/sor/sorV2/sorPathService.ts b/modules/sor/sorV2/sorPathService.ts
index a057d6632..a7407f9c9 100644
--- a/modules/sor/sorV2/sorPathService.ts
+++ b/modules/sor/sorV2/sorPathService.ts
@@ -330,7 +330,7 @@ class SorPathService implements SwapService {
         const returnAmount = swapKind === SwapKind.GivenIn ? outputAmount : inputAmount;
         const swapAmount = swapKind === SwapKind.GivenIn ? inputAmount : outputAmount;
 
-        const effectivePrice = inputAmount.divDownFixed(outputAmount.scale18);
+        const effectivePrice = outputAmount.amount > 0 ? inputAmount.divDownFixed(outputAmount.scale18) : Infinity;
         const effectivePriceReversed = outputAmount.divDownFixed(inputAmount.scale18);
 
         return {
@@ -348,7 +348,13 @@ class SorPathService implements SwapService {
             swapAmountRaw: swapAmount.amount.toString(),
             returnAmount: formatUnits(returnAmount.amount, returnAmount.token.decimals),
             returnAmountRaw: returnAmount.amount.toString(),
-            effectivePrice: formatUnits(effectivePrice.amount, effectivePrice.token.decimals),
+            effectivePrice:
+                effectivePrice === Infinity
+                    ? 'Infinity'
+                    : formatUnits(
+                          (effectivePrice as TokenAmount).amount,
+                          (effectivePrice as TokenAmount).token.decimals,
+                      ),
             effectivePriceReversed: formatUnits(effectivePriceReversed.amount, effectivePriceReversed.token.decimals),
             routes: this.mapRoutes(paths, pools),
             priceImpact: {