💸 x402 Monetization Skill Turn any local HTTP service into a paid service on platform networks (Base + Monad + Robinhood + X Layer; x402 V2 protocol, scheme, USDC/USDG via EIP-3009 — buyer pays zero gas), and act as a buyer paying other agents' x402 services with the user's Privy wallet. Architecture: reverse-proxy sidecar. The gateway ( ) sits in front of the user's untouched service. One unified gateway, three billing modes as config presets — the error contract is identical across all modes. Reference files (MUST read before the matching task) Detailed material lives in — it is part of th…