The Ethereum Foundation has announced the winners of the x402 Hackathon, which concluded on January 19. Among the standout projects are x402-sf by Superfluid, which introduces continuous subscription payments through a comprehensive subscription infrastructure, and Cheddr Payment Channels x402, which leverages x402's payment channels for efficient micropayment streaming. Another notable project is x402r by BackTrackCo, a tool designed to handle refund requests for undelivered data services paid via x402.