Paymaster

A paymaster is a smart contract that relays transactions. It provides a service that enables a third party to pay the transaction fee on behalf of the user by funding the paymaster in advance. The Paymaster acts as a gas reserve which then can be used during the call execution via the EntryPoint contract.

The thirdweb paymaster is initially paid for by thirdweb. By using an API key, the usage is tracked and billed.