diff --git a/.env.example b/.env.example
index e2a3a71..03e92d0 100644
--- a/.env.example
+++ b/.env.example
@@ -1,3 +1,4 @@
 PUBLIC_WALLET_CONNECT_PROJECT_ID=
 PRIVATE_POLYMER_MAINNET_ZONE_API_KEY=
 PRIVATE_POLYMER_TESTNET_ZONE_API_KEY=
+PRIVATE_ROUTEMESH_API_KEY=
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 5c9a897..8a4ce63 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -34,6 +34,7 @@ jobs:
         env:
           PRIVATE_POLYMER_MAINNET_ZONE_API_KEY: ${{ secrets.PRIVATE_POLYMER_MAINNET_ZONE_API_KEY }}
           PRIVATE_POLYMER_TESTNET_ZONE_API_KEY: ${{ secrets.PRIVATE_POLYMER_TESTNET_ZONE_API_KEY }}
+          PRIVATE_ROUTEMESH_API_KEY: ${{ secrets.PRIVATE_ROUTEMESH_API_KEY }}
           PUBLIC_WALLET_CONNECT_PROJECT_ID: ${{ secrets.PUBLIC_WALLET_CONNECT_PROJECT_ID }}
         run: bun run build
 
@@ -42,6 +43,7 @@ jobs:
         env:
           PRIVATE_POLYMER_MAINNET_ZONE_API_KEY: ${{ secrets.PRIVATE_POLYMER_MAINNET_ZONE_API_KEY }}
           PRIVATE_POLYMER_TESTNET_ZONE_API_KEY: ${{ secrets.PRIVATE_POLYMER_TESTNET_ZONE_API_KEY }}
+          PRIVATE_ROUTEMESH_API_KEY: ${{ secrets.PRIVATE_ROUTEMESH_API_KEY }}
           PUBLIC_WALLET_CONNECT_PROJECT_ID: ${{ secrets.PUBLIC_WALLET_CONNECT_PROJECT_ID }}
         with:
           apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
@@ -77,6 +79,7 @@ jobs:
         env:
           PRIVATE_POLYMER_MAINNET_ZONE_API_KEY: ${{ secrets.PRIVATE_POLYMER_MAINNET_ZONE_API_KEY }}
           PRIVATE_POLYMER_TESTNET_ZONE_API_KEY: ${{ secrets.PRIVATE_POLYMER_TESTNET_ZONE_API_KEY }}
+          PRIVATE_ROUTEMESH_API_KEY: ${{ secrets.PRIVATE_ROUTEMESH_API_KEY }}
           PUBLIC_WALLET_CONNECT_PROJECT_ID: ${{ secrets.PUBLIC_WALLET_CONNECT_PROJECT_ID }}
         run: bun run build
 
@@ -86,6 +89,7 @@ jobs:
         env:
           PRIVATE_POLYMER_MAINNET_ZONE_API_KEY: ${{ secrets.PRIVATE_POLYMER_MAINNET_ZONE_API_KEY }}
           PRIVATE_POLYMER_TESTNET_ZONE_API_KEY: ${{ secrets.PRIVATE_POLYMER_TESTNET_ZONE_API_KEY }}
+          PRIVATE_ROUTEMESH_API_KEY: ${{ secrets.PRIVATE_ROUTEMESH_API_KEY }}
           PUBLIC_WALLET_CONNECT_PROJECT_ID: ${{ secrets.PUBLIC_WALLET_CONNECT_PROJECT_ID }}
         with:
           apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
diff --git a/src/lib/libraries/outputFilledVerify.ts b/src/lib/libraries/outputFilledVerify.ts
new file mode 100644
index 0000000..97a701d
--- /dev/null
+++ b/src/lib/libraries/outputFilledVerify.ts
@@ -0,0 +1,35 @@
+import { createPublicClient, http } from "viem";
+import { PRIVATE_ROUTEMESH_API_KEY } from "$env/static/private";
+import { COIN_FILLER_ABI } from "$lib/abi/outputsettler";
+
+const OUTPUT_FILLED_EVENT = COIN_FILLER_ABI.find(
+	(item) => item.type === "event" && item.name === "OutputFilled"
+) as Extract<(typeof COIN_FILLER_ABI)[number], { type: "event"; name: "OutputFilled" }>;
+
+export type OutputFilledVerification = "match" | "mismatch" | "unknown";
+
+export async function verifyOutputFilledLog(
+	chainId: number,
+	blockNumber: bigint,
+	globalLogIndex: number
+): Promise<OutputFilledVerification> {
+	try {
+		const client = createPublicClient({
+			transport: http(`https://lb.routeme.sh/rpc/${chainId}/${PRIVATE_ROUTEMESH_API_KEY}`)
+		});
+		const logs = await client.getLogs({
+			fromBlock: blockNumber,
+			toBlock: blockNumber,
+			event: OUTPUT_FILLED_EVENT
+		});
+		return logs.some((l) => Number(l.logIndex) === globalLogIndex) ? "match" : "mismatch";
+	} catch (e) {
+		console.warn("routemesh OutputFilled verification failed", {
+			chainId,
+			blockNumber: blockNumber.toString(),
+			globalLogIndex,
+			error: e instanceof Error ? e.message : String(e)
+		});
+		return "unknown";
+	}
+}
diff --git a/src/routes/polymer/+server.ts b/src/routes/polymer/+server.ts
index c19da15..dbde7b6 100644
--- a/src/routes/polymer/+server.ts
+++ b/src/routes/polymer/+server.ts
@@ -6,6 +6,7 @@ import {
 	PRIVATE_POLYMER_TESTNET_ZONE_API_KEY
 } from "$env/static/private";
 import { toByteArray } from "base64-js";
+import { verifyOutputFilledLog } from "$lib/libraries/outputFilledVerify";
 
 function getPolymerUrl(mainnet: boolean) {
 	return mainnet
@@ -27,6 +28,14 @@ export const POST: RequestHandler = async ({ request }) => {
 
 	let polymerRequestIndex = polymerIndex;
 	if (!polymerRequestIndex) {
+		const verification = await verifyOutputFilledLog(
+			Number(srcChainId),
+			BigInt(srcBlockNumber),
+			Number(globalLogIndex)
+		);
+		if (verification === "mismatch") {
+			return json({ error: "log is not an OutputFilled event" }, { status: 400 });
+		}
 		const requestProof = await axios.post(
 			POLYMER_URL,
 			{