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This page describes paymasters in the legacy Sophon v1 chain. Do not begin a new production deployment on Sophon; see the migration guide for current actions.
Paymasters were ZK Stack smart contracts that could pay or customize gas fees for a Sophon transaction. Applications used them to sponsor user activity, set allowance rules, grant NFT-based fee benefits, or accept an ERC-20 token in place of SOPH. The implementation guide is retained for teams maintaining a legacy deployment during the wind-down: Setting Up Paymasters.