During November 2025, Yycanusher developed and launched the Meson x402 cross-chain wallet extension in the coinbase/x402 repository. This Chrome extension enables users to connect both EVM and Solana wallets, facilitating cross-chain payments and generating standardized X Payment Headers for improved interoperability. Yycanusher integrated blockchain technologies and front end development skills, using JSON to structure metadata that supports interface testing and integration. The work focused on reducing QA cycles and maintaining audit traceability through detailed commits. While the project scope was limited to a single feature over one month, the implementation addressed key requirements for cross-chain wallet connectivity and testing.