diff --git a/frontend_v2/pages/_app.tsx b/frontend_v2/pages/_app.tsx
index ad38dc1..569c477 100644
--- a/frontend_v2/pages/_app.tsx
+++ b/frontend_v2/pages/_app.tsx
@@ -4,20 +4,30 @@ import type { AppProps } from 'next/app'
 import { RainbowKitProvider, getDefaultWallets, getDefaultConfig } from '@rainbow-me/rainbowkit';
 import { metaMaskWallet } from '@rainbow-me/rainbowkit/wallets';
 import {
-  scroll,
   scrollSepolia,
-  optimism,
   optimismSepolia,
-  polygonZkEvm,
   polygonZkEvmTestnet,
-  sepolia,
-  linea,
-  lineaTestnet
+  lineaTestnet,
 } from 'wagmi/chains';
 
+import { defineChain } from 'viem'
+
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import { WagmiProvider } from 'wagmi';
 
+export const thunderTest = defineChain({
+  id: 18,
+  name: 'ThunderCore Testnet',
+  nativeCurrency: { name: 'ThunderCore Testnet Token', symbol: 'TST', decimals: 18 },
+  rpcUrls: {
+    default: { http: ['https://testnet-rpc.thundercore.com'] },
+  },
+  blockExplorers: {
+    default: { name: 'thundercore-blockscout-testnet', url: 'https://explorer-testnet.thundercore.com' },
+  },
+  contracts: {},
+})
+
 const { wallets } = getDefaultWallets();
 const config = getDefaultConfig({
   appName: 'RainbowKit demo',
@@ -30,16 +40,11 @@ const config = getDefaultConfig({
     },
   ],
   chains: [
-    sepolia,
-    scroll,
     scrollSepolia,
-    polygonZkEvm,
     polygonZkEvmTestnet,
-    optimism,
     optimismSepolia,
-    linea,
     lineaTestnet,
-    ...(process.env.NEXT_PUBLIC_ENABLE_TESTNETS === 'true' ? [sepolia] : []),
+    thunderTest,
   ],
   ssr: true,
 });