diff --git a/.changeset/twelve-steaks-call.md b/.changeset/twelve-steaks-call.md
new file mode 100644
index 000000000..559f9e437
--- /dev/null
+++ b/.changeset/twelve-steaks-call.md
@@ -0,0 +1,5 @@
+---
+'backend': patch
+---
+
+fix onchain balances for v3
diff --git a/modules/sources/contracts/v3/fetch-pool-data.ts b/modules/sources/contracts/v3/fetch-pool-data.ts
index 7e1ffe367..ddd647682 100644
--- a/modules/sources/contracts/v3/fetch-pool-data.ts
+++ b/modules/sources/contracts/v3/fetch-pool-data.ts
@@ -98,7 +98,7 @@ export async function fetchPoolData(
                 isPoolInRecoveryMode: config?.isPoolInRecoveryMode,
                 tokens: poolTokenInfo?.[0].map((token: string, i: number) => ({
                     address: token.toLowerCase(),
-                    balance: poolTokenInfo[2][i],
+                    balance: poolTokenInfo[3][i],
                     paysYieldFees: poolTokenInfo[1][i].paysYieldFees,
                     rateProvider: poolTokenInfo[1][i].rateProvider,
                     rate: poolTokenRates ? poolTokenRates[1][i] : 1000000000000000000n,