> ## Documentation Index
> Fetch the complete documentation index at: https://daehan-base.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# eth_chainId

> Get the currently configured chain ID

Defined in [EIP-695](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-695.md)

<Info>
  Returns the currently configured chain ID, a value used in replay-protected transaction signing as introduced by EIP-155.
</Info>

## Parameters

This method does not accept any parameters.

## Returns

<ResponseField name="result" type="string">
  A hexadecimal string representing the chain ID.
</ResponseField>

<RequestExample>
  ```json Request theme={null}
  {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "eth_chainId",
    "params": []
  }
  ```
</RequestExample>

<ResponseExample>
  ```json Ethereum Mainnet theme={null}
  {
    "id": 1,
    "jsonrpc": "2.0",
    "result": "0x1"
  }
  ```

  ```json Base Mainnet theme={null}
  {
    "id": 1,
    "jsonrpc": "2.0",
    "result": "0x2105"
  }
  ```
</ResponseExample>

## Error Handling

| Code | Message                        | Description                               |
| ---- | ------------------------------ | ----------------------------------------- |
| 4100 | Requested method not supported | The method is not supported by the wallet |

<Info>
  Common chain IDs: Ethereum Mainnet (0x1), Base Mainnet (0x2105), Base Sepolia (0x14a34).
</Info>