Alex Arteaga Contijoch enhanced the royco-sdk repository by implementing a targeted update to the Sepolia token-map, adding a WETH9 token definition to support token interactions and display on the Sepolia testnet. Leveraging TypeScript and frontend development skills, Alex integrated the WETH9 token’s address, metadata, and image into the SDK, ensuring seamless compatibility with existing token-map logic. This work improved testnet parity and user experience for token exploration, while maintaining project standards and stability. The focused change set demonstrated a clear understanding of smart contract integration and contributed foundational support for future ERC-20 tooling within the SDK’s architecture.