Core Insights - The Ethereum Foundation announced the successful conclusion of the x402 hackathon supported by the developer acceleration team, revealing several award-winning projects [1] Group 1: Award-winning Projects - x402-sf, developed by Superfluid, provides end-to-end subscription infrastructure for native internet continuous subscription payments [1] - Cheddr Payment Channels x402 utilizes payment channels to enable micropayments, addressing the issue of high-frequency requests leading to numerous on-chain transactions [1] - x402r, developed by BackTrackCo, offers a refund request tool for cases where data paid for via x402 is not delivered, aiming to establish a simple trust mechanism for AI agents and APIs [1]