An ERC-4337 contract that sponsors gas so a user can pay in tokens or transact for free under a policy.

A state channel used for repeated payments, the Lightning Network being the best-known example.

An earlier L2 design that commits roots to L1 and relies on exits. Largely superseded by rollups.

An assurance about a transaction's expected inclusion, ordering, or execution given before the blockchain's ordinary confirmation or finality process completes.

The service that builds validity proofs for a ZK rollup or zkVM.