diff --git a/packages/relayer/src/exceptions/base.exception.ts b/packages/relayer/src/exceptions/base.exception.ts
index 617b3ea..1c44ed3 100644
--- a/packages/relayer/src/exceptions/base.exception.ts
+++ b/packages/relayer/src/exceptions/base.exception.ts
@@ -31,6 +31,9 @@ export enum ErrorCode {
 
   // SDK error. Wrapper for sdk's native errors
   SDK_ERROR = "SDK_ERROR",
+
+  // Quote errors
+  QUOTE_ERROR = "QUOTE_ERROR",
 }
 
 /**
@@ -257,3 +260,16 @@ export class BlockchainError extends RelayerError {
   }
 
 }
+
+export class QuoterError extends RelayerError {
+  constructor(message: string, code: ErrorCode = ErrorCode.QUOTE_ERROR, details?: Record<string, unknown> | string) {
+    super(message, code, details);
+    this.name = this.constructor.name;
+  }
+
+  public static assetNotSupported(
+    details?: Record<string, unknown> | string) {
+    return new QuoterError("Asset is not supported", ErrorCode.ASSET_NOT_SUPPORTED, details);
+  }
+
+}
diff --git a/packages/relayer/src/handlers/relayer/quote.ts b/packages/relayer/src/handlers/relayer/quote.ts
index 007c628..2e0acdf 100644
--- a/packages/relayer/src/handlers/relayer/quote.ts
+++ b/packages/relayer/src/handlers/relayer/quote.ts
@@ -1,7 +1,7 @@
 import { NextFunction, Request, Response } from "express";
 import { getAddress } from "viem";
 import { getAssetConfig } from "../../config/index.js";
-import { RelayerError } from "../../exceptions/base.exception.js";
+import { QuoterError } from "../../exceptions/base.exception.js";
 import { web3Provider } from "../../providers/index.js";
 import { QuoteProvider } from "../../providers/quote.provider.js";
 import { QuoteMarshall } from "../../types.js";
@@ -20,7 +20,7 @@ export async function relayQuoteHandler(
 
   const config = getAssetConfig(chainId, tokenAddress);
   if (config === undefined)
-    throw RelayerError.unknown(`Asset ${tokenAddress} for chain ${chainId} is not supported`)
+    return next(QuoterError.assetNotSupported(`Asset ${tokenAddress} for chain ${chainId} is not supported`));
 
   const quoteProvider = new QuoteProvider(config.fee_bps);
   const gasPrice = await web3Provider.getGasPrice(chainId);