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

# Chain Utils

> Utility functions for configuring chains in the Relay SDK

## Overview

The `/chain-utils` subpath export contains utilities for dynamically configuring chains in your application. These functions were moved to a separate entry point to enable better tree-shaking and reduce the default SDK bundle size.

## Installation

The chain utilities are included in the main SDK package. Simply import from the `/chain-utils` subpath:

```typescript theme={null}
import { 
  configureViemChain, 
  configureDynamicChains
} from '@relayprotocol/relay-sdk/chain-utils'
```

## Functions

### configureViemChain

Configures a single viem chain for use with the Relay SDK.

```typescript theme={null}
import { configureViemChain } from '@relayprotocol/relay-sdk/chain-utils'
import { arbitrum } from 'viem/chains'

const relayChain = configureViemChain(arbitrum)
```

| Parameter | Type    | Description                                |
| --------- | ------- | ------------------------------------------ |
| **chain** | `Chain` | A viem chain object to configure for Relay |

**Returns:** A configured Relay chain object ready to use with the SDK.

***

### configureDynamicChains

Fetches supported chains from the Relay API and configures them dynamically in the SDK. This is useful for applications that want to support all available chains without hardcoding them.

```typescript theme={null}
import { configureDynamicChains } from '@relayprotocol/relay-sdk/chain-utils'

const chains = await configureDynamicChains()
// Returns an array of configured chains with viemChain properties
```

**Returns:** `Promise<RelayChain[]>` - An array of Relay chain objects, each containing a `viemChain` property for use with wagmi/viem.