Worked on the royco-sdk repository to enhance token support by adding a WETH9 token definition to the Sepolia testnet’s token-map constants. This update, implemented using TypeScript and frontend development skills, enabled seamless WETH interactions and improved token display within the SDK. The approach focused on expanding testnet parity and enriching the developer experience without disrupting existing token-map logic. By integrating smart contract metadata such as address, symbol, and image URL, the work laid the foundation for broader ERC-20 tooling. The changes were delivered as a focused, reviewable feature, maintaining project standards and ensuring stability across the token-map surface.