BlockBeats News, January 19th, the Ethereum Foundation announced that the x402 hackathon supported by the Developer Acceleration Team has successfully concluded, and revealed some of the winning projects, including:x402-sf (developed by Superfluid): Introducing native continuous subscription payments to the Internet through end-to-end subscription infrastructure;Cheddr Payment Channels x402: Utilizing x402's payment channels to enable efficient cyclic and streaming micropayments;x402r (developed by BackTrackCo): Providing a refund request tool for cases where x402 payments were made for purchasing data services but delivery was not completed.