Worked on the coinbase/x402 repository to deliver the Elsa x402 Service Metadata Enhancement, introducing a new facilitator and a structured metadata format encompassing base URL, supported networks, and asset information. Focused on backend and API development, the approach centered on metadata-driven configuration to improve service discoverability and interoperability, enabling downstream integrations to rely on standardized data. Leveraged JSON for data structuring and maintained disciplined Git workflows throughout the process. While no major bugs were addressed during this period, the work demonstrated a clear understanding of metadata modeling and API facilitation patterns, contributing to more maintainable and integrable backend services.