x402fix lite: x402 endpoint grade + fix list

Overview

x402 endpoint doctor for sellers: give it the URL of a paid route and it probes it without paying (GET, HEAD, empty POST, POST {}, CORS preflight), then grades it A to F with a numbered list of paste-ready fixes. Checks the v2 PAYMENT-REQUIRED header and v1 body, CAIP-2 networks, the USDC asset and EIP-712 domain, Solana feePayer, atomic amounts, payTo, discovery metadata and multichain drift. Lite ($0.005): every check, with grade, score, status and the numbered fix list. Limits: it reads only what an unpaid client sees, so it can't confirm settlement end to end; fixes are suggestions, and a passing grade does not guarantee listing or settlement. USDC on Base, Polygon, Arbitrum One or Solana via x402, or prepaid YourAITools credit keys. Built by YourAITools (youraitools.co).

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