> ## 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.

# wallet_addSubAccount

> Add a sub account to the wallet

Experimental RPC method for creating sub accounts

<Info>
  Creates a new sub account associated with the main wallet account. Sub accounts allow for hierarchical account management and delegation.
</Info>

## Parameters

<ParamField body="account" type="object" required>
  The account configuration object.

  <Expandable title="Account object properties">
    <ParamField body="type" type="string" required>
      The type of sub account to create. Can be "create" or "deployed".
    </ParamField>

    <ParamField body="keys" type="array">
      Array of key objects for the sub account (required for "create" type).

      <Expandable title="Key object properties">
        <ParamField body="type" type="string" required>
          Type of key: "address", "p256", "webcrypto-p256", or "webauthn-p256".
        </ParamField>

        <ParamField body="publicKey" type="string" required>
          Hex string of the public key.
        </ParamField>
      </Expandable>
    </ParamField>

    <ParamField body="address" type="string">
      The address of the deployed account to add as a sub account. (required for "deployed" type).
    </ParamField>

    <ParamField body="chainId" type="number">
      The chain ID that the account is deployed on. (required for "deployed" type).
    </ParamField>
  </Expandable>
</ParamField>

## Returns

<ResponseField name="result" type="object">
  Sub account information including address and deployment details.

  <Expandable title="Result properties">
    <ResponseField name="address" type="string">
      The address of the created sub account.
    </ResponseField>

    <ResponseField name="factory" type="string">
      The factory contract address (optional).
    </ResponseField>

    <ResponseField name="factoryData" type="string">
      Factory deployment data (optional).
    </ResponseField>
  </Expandable>
</ResponseField>

<RequestExample>
  ```json Create Request theme={null}
  {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "wallet_addSubAccount",
    "params": [{
      "account": {
        "type": "create",
        "keys": [{
          "type": "p256",
          "publicKey": "0x0123456789abcdef..."
        }]
      }
    }]
  }
  ```

  ```json Deployed Request theme={null}
  {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "wallet_addSubAccount",
    "params": [{
      "account": {
        "type": "deployed",
        "address": "0x1234567890123456789012345678901234567890",
        "chainId": 8453
      }
    }]
  }
  ```
</RequestExample>

<ResponseExample>
  ```json Success Response theme={null}
  {
    "id": 1,
    "jsonrpc": "2.0",
    "result": {
      "address": "0x1234567890123456789012345678901234567890",
      "chainId": "0x2105"
    }
  }
  ```
</ResponseExample>

## Error Handling

| Code   | Message                        | Description                               |
| ------ | ------------------------------ | ----------------------------------------- |
| 4001   | User rejected the request      | User denied creating the sub account      |
| 4100   | Requested method not supported | The method is not supported by the wallet |
| -32602 | Invalid params                 | Invalid account configuration             |

<Warning>
  This is an experimental feature and the API may change in future versions.
</Warning>