# How to use the Verifying Paymaster

:::tip[Tip]
We recommend using [permissionless.js](/references/permissionless/reference/smart-account-actions/sendUserOperation) as the SDK to interact with the Verifying Paymaster as it provides type-safe wrappers for paymaster methods.
:::

Paymasters are entities that user operations can delegate the responsibilities for gas fee payments for. You can interact with paymasters using JSON-RPC requests.

To get access to the paymaster, you need to [create a Pimlico API key](/guides/create-api-key) and sign up to the [Pimlico dashboard](https://dashboard.pimlico.io). Next, load up some balance to your Pimlico account in the [payment methods page](https://dashboard.pimlico.io/payment) or add your card. Then, using the API key, you can make the following JSON-RPC requests to the paymaster:

* [pm\_sponsorUserOperation](/references/paymaster/verifying-paymaster/endpoints#pm_sponsoruseroperation-v2)

If you would like an end-to-end example of how to use the Verifying Paymaster, please refer to [tutorial 1](/references/permissionless/tutorial/tutorial-1) of the permissionless.js documentation.