diff --git a/api/_utils.ts b/api/_utils.ts
index 26b6b982f..e6f4e07a5 100644
--- a/api/_utils.ts
+++ b/api/_utils.ts
@@ -526,7 +526,7 @@ export const getRelayerFeeDetails = async (
     );
   } catch (err: unknown) {
     const reason = resolveEthersError(err);
-    throw new InputError(`Failed to estimate relayer fees (${reason})`);
+    throw new InputError(`Relayer fill simulation failed - ${reason}`);
   }
 };