fix(finalizer): Fix Helios 404 detection broken by axios removal

package.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "@across-protocol/constants": "^3.1.102",
     "@across-protocol/contracts": "5.0.4",
-    "@across-protocol/sdk": "4.3.138",
+    "@across-protocol/sdk": "4.3.139",
     "@arbitrum/sdk": "^4.0.2",
     "@consensys/linea-sdk": "^0.3.0",
     "@coral-xyz/anchor": "^0.31.1",

src/finalizer/utils/helios.ts

@@ -12,6 +12,7 @@ import {
   assert,
   fetchWithTimeout,
   postWithTimeout,
+  isHttpError,
 } from "../../utils";
 import { spreadEventWithBlockNumber } from "../../utils/EventUtils";
 import { FinalizerPromise, CrossChainMessage } from "../types";
@@ -351,9 +352,9 @@ async function enrichHeliosActions(
       getError = error;
     }
 
-    // Handle fetch error based on whether it was a NOTFOUND or another error
+    // Handle fetch error based on whether it was a NOTFOUND or another error.
     if (getError) {
-      const isNotFoundError = getError instanceof Error && getError.message.includes("HTTP 404");
+      const isNotFoundError = isHttpError(getError) && getError.status === 404;
       if (isNotFoundError) {
         // NOTFOUND error -> Request proof
         logger.debug({ ...logContext, message: "Proof not found (404), requesting...", proofId });

src/utils/SDKUtils.ts

@@ -117,6 +117,7 @@ export const {
   chainHasNativeToken,
   fetchWithTimeout,
   postWithTimeout,
+  isHttpError,
 } = sdk.utils;
 
 export type FetchHeaders = sdk.utils.FetchHeaders;