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

# eth_chainId

> Returns the chain ID of the current network.

Returns the chain ID of the current network per [EIP-695](https://eips.ethereum.org/EIPS/eip-695).

## Parameters

No parameters.

## Returns

<ResponseField name="result" type="string">
  The chain ID as a hexadecimal string. `"0x2105"` (8453) for Base Mainnet, `"0x14a34"` (84532) for Base Sepolia.
</ResponseField>

## Example

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

  ```json Response (Base Mainnet) theme={null}
  {
    "jsonrpc": "2.0",
    "id": 1,
    "result": "0x2105"
  }
  ```

  ```json Response (Base Sepolia) theme={null}
  {
    "jsonrpc": "2.0",
    "id": 1,
    "result": "0x14a34"
  }
  ```
</CodeGroup>