The Ethereum Foundation has successfully concluded the x402 Hackathon, supported by the Developer Acceleration Team, and announced several winning projects. Among the winners is x402-sf, developed by Superfluid, which offers end-to-end subscription infrastructure for native internet continuous subscription payments. Another notable project is Cheddr Payment Channels x402, which utilizes payment channels to enable micropayments, addressing the issue of high-frequency requests leading to numerous on-chain transactions. Additionally, x402r, developed by BackTrackCo, provides a refund request tool for undelivered data paid through x402, aiming to establish a simple trust mechanism for AI agents and APIs.