Sponsored Transactions are an important part of Account Abstraction.

When creating a batch of transacions to send via a paymaster and have them sponsored, you first must get an api key to do so, details of this can be found here.

Then when using the Etherspot Batches tag we can add paymaster values like so:

    url: "https://arka.etherspot.io",
    api_key: "arka_public_key",
    context: { mode: "sponsor" }

If the address is whitelisted with the paymaster for this api_key, then the transaction will be sponsored. You can learn more about Arka API calls here.