# getChain

> **getChain**(`id?`): [`Chain`](/reference/filoz/synapse-core/chains/interfaces/chain/)

Defined in: [packages/synapse-core/src/chains.ts:316](https://github.com/FilOzone/synapse-sdk/blob/4abf9b3cc7aab15a3f0ad9b17343a9510b1d9473/packages/synapse-core/src/chains.ts#L316)

Get a chain by id

## Parameters

| Parameter | Type | Description |
| ------ | ------ | ------ |
| `id?` | `number` | The chain id. Defaults to mainnet. |

## Returns

[`Chain`](/reference/filoz/synapse-core/chains/interfaces/chain/)