> ## 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.

# coinbase_fetchPermission

> Retrieve a single permission by its hash

Coinbase-specific RPC method

<Info>
  Retrieves a single spend permission by its unique hash identifier. This method allows direct lookup of a specific permission without needing to know the account, chain, or spender details.
</Info>

## Parameters

<ParamField body="permissionHash" type="string" required>
  The unique hash identifier of the permission to retrieve.
</ParamField>

## Returns

<ResponseField name="result" type="object">
  The permission response object.

  <Expandable title="FetchPermissionResult properties">
    <ResponseField name="permission" type="object">
      The permission object containing all details of the requested permission.

      <Expandable title="Permission properties">
        <ResponseField name="createdAt" type="number">
          Unix timestamp when the permission was created.
        </ResponseField>

        <ResponseField name="permissionHash" type="string">
          The unique hash identifier of the permission.
        </ResponseField>

        <ResponseField name="signature" type="string">
          The cryptographic signature authorizing this permission.
        </ResponseField>

        <ResponseField name="spendPermission" type="object">
          The detailed spend permission parameters.

          <Expandable title="SpendPermission properties">
            <ResponseField name="account" type="string">
              The address of the account granting the permission.
            </ResponseField>

            <ResponseField name="spender" type="string">
              The address authorized to spend from the account.
            </ResponseField>

            <ResponseField name="token" type="string">
              The token contract address for which spending is authorized.
            </ResponseField>

            <ResponseField name="allowance" type="string">
              The maximum amount that can be spent (in smallest unit).
            </ResponseField>

            <ResponseField name="period" type="number">
              The duration in seconds for which the permission is valid within each period.
            </ResponseField>

            <ResponseField name="start" type="number">
              Unix timestamp when the permission becomes active.
            </ResponseField>

            <ResponseField name="end" type="number">
              Unix timestamp when the permission expires.
            </ResponseField>

            <ResponseField name="salt" type="string">
              A unique value used to generate the permission hash.
            </ResponseField>

            <ResponseField name="extraData" type="string">
              Additional data associated with the permission (hex encoded).
            </ResponseField>
          </Expandable>
        </ResponseField>
      </Expandable>
    </ResponseField>
  </Expandable>
</ResponseField>

<RequestExample>
  ```json Request theme={null}
  {
    "id": 1,
    "jsonrpc": "2.0",
    "method": "coinbase_fetchPermission",
    "params": [{
      "permissionHash": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef"
    }]
  }
  ```
</RequestExample>

<ResponseExample>
  ```json Success Response theme={null}
  {
    "id": 1,
    "jsonrpc": "2.0",
    "result": {
      "permission": {
        "createdAt": 1640995200,
        "permissionHash": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
        "signature": "0xdef456...",
        "spendPermission": {
          "account": "0xfB2adc8629FC9F54e243377ffcECEb437a42934C",
          "spender": "0x2a83b0e4462449660b6e7567b2c81ac6d04d877d",
          "token": "0xA0b86a33E6441b97B7cd5C4F5B42a6e2F8a38923",
          "allowance": "1000000000000000000",
          "period": 86400,
          "start": 1640995200,
          "end": 1672531200,
          "salt": "12345678901234567890",
          "extraData": "0x"
        }
      }
    }
  }
  ```

  ```json Error Response - Permission Not Found theme={null}
  {
    "id": 1,
    "jsonrpc": "2.0",
    "error": {
      "code": -32602,
      "message": "Permission not found"
    }
  }
  ```
</ResponseExample>

## Error Handling

| Code   | Message             | Description                                        |
| ------ | ------------------- | -------------------------------------------------- |
| -32602 | Invalid params      | The permissionHash parameter is invalid or missing |
| -32603 | Internal error      | Permission not found or internal server error      |
| -32001 | Failed precondition | The method is currently disabled via kill switch   |

<Warning>
  The `permissionHash` must be a valid hex-encoded hash string. The method will return an error if the permission doesn't exist or has been deleted.
</Warning>

## Usage Notes

<Note>
  This method is particularly useful when:

  * You have a permission hash from a previous operation and need to retrieve its details
  * You want to verify the current state of a specific permission
  * You need to look up permission details without knowing the account or spender information
</Note>

Unlike `coinbase_fetchPermissions`, this method:

* Returns a single permission instead of a list
* Does not require account, chain, or spender parameters
* Does not support pagination
* Provides direct access via the permission's unique identifier