​
Multi chain setup

Nexus supports multiple chains out of the box. You can configure your NodeProvider instances to connect to different chains, and Nexus will automatically route requests to the appropriate chain based on the endpoint.

import {
  Nexus,
  NodeProvider,
  CHAIN,
} from "@whatsgood/nexus";

const alchemyEthMainnetProvider = new NodeProvider({
  name: "alchemy-eth-mainnet",
  chain: CHAIN.ETHEREUM_MAINNET,
  url: process.env.ALCHEMY_ETH_MAINNET_URL,
});

const alchemyEthSepoliaProvider = new NodeProvider({
  name: "alchemy-eth-sepolia",
  chain: CHAIN.ETHEREUM_SEPOLIA,
  url: process.env.ALCHEMY_ETH_SEPOLIA_URL,
});

const nexus = Nexus.create({
  nodeProviders: [alchemyEthMainnetProvider, alchemyEthSepoliaProvider],
  //...
});

​
Using multiple chains

Once you’ve set up your NodeProvider instances, you can use them in your requests by specifying the chain in the endpoint. For example, to make a request to the Ethereum Sepolia chain, you would use the following endpoint:

curl \
    -X POST http://localhost:4000/11155111 \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'