During February 2026, Polka Gefiedert developed a USDC payment verification and settlement facilitator for fretchen.eu, focusing on cross-network transactions using EIP-3009 on Optimism and Base. Working within the coinbase/x402 repository, Polka integrated API-driven backend logic to enable seamless verification and settlement of USDC payments, reducing latency and improving reconciliation across networks. The solution leveraged blockchain technology and JSON for data interchange, positioning fretchen.eu for future network expansion. While the work was limited to a single feature over one month, it demonstrated depth in backend development and cross-chain settlement flows, addressing reconciliation accuracy and enhancing cross-network usability for the platform.