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

# eth_chainId

Returns the chain ID used for signing replay-protected transactions.

This method will use `10` [Compute Units](/nodeapi/about/billing).

***

## Reference: [Here](https://ethereum.org/en/developers/docs/apis/json-rpc/#eth_chainid)

## **Parameters**

`None`

## **Returns**

`chainId`, hexadecimal value as a string representing the integer of the current chain id.

```json theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
// Result
{
  "jsonrpc": "2.0",
  "id": 0,
  "result": "0x82"
}
```

<CodeGroup>
  ```bash title="mainnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  curl https://mainnet.unichain.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
      -X POST \
      -H "Content-Type: application/json" \
      -d '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":0}'
  ```
</CodeGroup>


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