# zks_L1ChainId

> import Tabs from '@theme/Tabs'
import TabItem from '@theme/TabItem'

# `zks_L1ChainId`

Returns the chain ID of the underlying L1.

## Parameters

None.

## Response

The L1 chain ID.

## Example

Replace `<YOUR-API-KEY>` with an API key from your [Infura dashboard](https://app.infura.io/).

### Request

<Tabs>
  <TabItem value="curl">

```bash
curl https://zksync-mainnet.infura.io/v3/<YOUR-API-KEY> \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "id": 1, "method": "zks_L1ChainId", "params": []}'
```

  </TabItem>
  <TabItem value="WSS">

```bash
wscat -c wss://zksync-mainnet.infura.io/ws/v3/<YOUR-API-KEY> -x '{"jsonrpc": "2.0", "id": 1, "method": "zks_L1ChainId", "params": []}'
```

  </TabItem>
</Tabs>

### Response

<Tabs>
  <TabItem value="JSON">

```json
{
  "jsonrpc": "2.0",
  "result": "0x1",
  "id": 1
}
```

  </TabItem>
</Tabs>