# 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/ce70156aec4743b160a499b1092490121b425435/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/)