GasSponsor Contract

Contract Address: 0x57bD140dE7a7AdbF3DF8E962D9984B3F473F28c4

The GasSponsor contract is a key component of our Sponsored Transactions feature. It enables atomic gas sponsorship within bundles, allowing users to trade without needing ETH for gas fees.

Core Functions

• prefund: A relayer calls this function to pre-fund ETH to a user and record the debt.
• prefundBatch: Allows a relayer to pre-fund multiple users in a single transaction.
• repay: A user calls this function (or sends ETH to the contract) to repay their debt.
• finalizeBundle: A relayer calls this function at the end of a bundle to ensure that all sponsored users have repaid their debts.

Events

• Prefunded: Emitted when a user is pre-funded with ETH.
• Repaid: Emitted when a user repays their debt.
• BundleFinalized: Emitted when a bundle is successfully finalized.

Sponsorship Flow

1. Prefunding: Relayer calls prefund or prefundBatch to provide ETH to users
2. User Transaction: User executes their transaction using the prefunded gas
3. Repayment: User’s transaction includes a repayment to the GasSponsor contract
4. Finalization: Relayer calls finalizeBundle to verify all debts are settled

The GasSponsor contract is designed to be non-reentrant and secure, ensuring that all sponsorships and repayments are handled atomically and without risk to the relayers.