diff --git a/src/services/paymentService.ts b/src/services/paymentService.ts
index 501e2b8..1adfc9c 100644
--- a/src/services/paymentService.ts
+++ b/src/services/paymentService.ts
@@ -14,13 +14,13 @@ import { WalletType } from './types'
 assert(process.env.NEXT_PUBLIC_SOLANA_RPC_URL, 'SOLANA_RPC_URL is required');
 assert(process.env.NEXT_PUBLIC_MTM_TOKEN_MINT, 'MTM_TOKEN_MINT is required');
 assert(process.env.NEXT_PUBLIC_PAYMENT_RECEIVER_ADDRESS, 'PAYMENT_RECEIVER_ADDRESS is required');
+assert(process.env.NEXT_PUBLIC_USDC_MINT, 'USDC_MINT is required');
 
 const MTM_TOKEN_MINT = process.env.NEXT_PUBLIC_MTM_TOKEN_MINT;
 const PAYMENT_RECEIVER_ADDRESS = process.env.NEXT_PUBLIC_PAYMENT_RECEIVER_ADDRESS;
 const SOLANA_RPC_URL = process.env.NEXT_PUBLIC_SOLANA_RPC_URL;
 const SOLANA_WEBSOCKET_URL = process.env.NEXT_PUBLIC_SOLANA_WEBSOCKET_URL;
-
-const USDC_MINT = 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v'; // USDC mint address
+const USDC_MINT = process.env.NEXT_PUBLIC_USDC_MINT;
 
 const connection = new Connection(
   SOLANA_RPC_URL,