> ## Documentation Index
> Fetch the complete documentation index at: https://nexus.whatsgood.dog/llms.txt
> Use this file to discover all available pages before exploring further.

# Multi Chain

> Learn how to configure Nexus to support multiple chains

## 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.

```typescript theme={null}
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:

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

```