Custom chains

import { Chain, getDefaultWallets } from '@rainbow-me/rainbowkit';
import { createConfig, WagmiProvider } from 'wagmi';

const avalanche: Chain = {
  id: 43_114,
  name: 'Avalanche',
  nativeCurrency: {
    decimals: 18,
    name: 'Avalanche',
    symbol: 'AVAX',
  },
  rpcUrls: {
    public: { http: ['https://api.avax.network/ext/bc/C/rpc'] },
    default: { http: ['https://api.avax.network/ext/bc/C/rpc'] },
  },
  blockExplorers: {
    default: { name: 'SnowTrace', url: 'https://snowtrace.io' },
    etherscan: { name: 'SnowTrace', url: 'https://snowtrace.io' },
  },
  contracts: {
    multicall3: {
      address: '0xca11bde05977b3631167028862be2a173976ca11',
      blockCreated: 11_907_934,
    },
  },
  testnet: false,
};


const { connectors } = getDefaultWallets({
  appName: 'My RainbowKit App',
  projectId: 'YOUR_PROJECT_ID',
});

const chains: readonly [Chain, ...Chain[]] = [avalanche];

const config = createConfig({
  chains,
  connectors,
  transports: {
    [avalanche.id]: http(),
  },
});

const App = () => {
  return (
    <WagmiProvider config={config}>
      <RainbowKitProvider chains={chains}>
        {/* Your App */}
      </RainbowKitProvider>
    </WagmiProvider>
  );
};