Developed and delivered X402 Payment Protocol support within the 0xGasless integration for the ava-labs/builders-hub repository, enabling on-chain payments on the Avalanche blockchain. This work involved integrating the facilitator service to support production-ready on-chain workflows, expanding the platform’s payment capabilities for decentralized applications. Focused on API integration and smart contract development, the implementation improved transaction flow, security, and user experience for dApps operating on Avalanche. The changes set the foundation for broader adoption of on-chain payments by enhancing workflow automation and reliability. The work was completed using Markdown for documentation and code changes, with no major bugs addressed during this period.