Live check of one product page for Google Merchant Center readiness. Pass ?url=. Returns JSON: parsed schema.org Product/Offer fields (name, image, price, currency, availability, brand, GTIN/MPN, condition), og:price vs JSON-LD price mismatch, return/shipping markup, per-field ok/missing with GMC impact, and a ready / fix_required verdict. Useful before submitting a feed or appealing a price-mismatch disapproval. Not charged if the page can't be fetched. Automated check of public page markup only; not a guarantee of GMC approval. How to buy: GET the endpoint; it answers HTTP 402 with the exact amount (0.005 USDC) and payTo on Base, then retry with the x402 payment (PayAI facilitator). Price is per call.