Gas Station Network (GSN)

The Gas Station Network (GSN) is an open-source system for Ethereum and compatible chains that allows an application to pay the gas fees for its users. Normally every transaction must be paid for in ether by the account that sends it, which is a hurdle for newcomers. With GSN, a user signs a request, called a meta-transaction, and passes it to a network of relay servers. A relayer submits it to the chain and pays the gas, and a contract known as a paymaster, funded by the application, reimburses the relayer. The receiving smart contract must be adapted to recognize who the real sender is. GSN was an early answer to the "gasless" transaction problem; similar goals are now also pursued through account abstraction, which builds sponsored fees into wallets. Also see decentralized applications.