{"service":"graftxchange","version":"1","description":"Machine-readable, verified e-commerce catalog data for AI shopping and procurement agents.","auth":{"header":"x-agent-key","type":"api_key"},"payment":{"scheme":"x402","flow":["Call a tool with no payment headers.","Receive HTTP 402 with amountMicros, nonce, expiresAt and a `sign` string.","Ed25519-sign the `sign` string with the key registered as your wallet address.","Re-send the same request with x-payment-nonce and x-payment-signature."],"currency":"USD"},"tools":[{"name":"search_products","priceMicros":5000,"input":{"query":"string","category":"string?","maxPrice":"number?","inStockOnly":"boolean?","limit":"number?"},"output":"products[]: sku, title, brand, category, price, currency, stock, availability, merchant, url, checkout, protocol"},{"name":"verify_inventory","priceMicros":10000,"input":{"skus":"string[]"},"output":"products[] with live stock, availability and price at query time"},{"name":"compare_products","priceMicros":20000,"input":{"query":"string","limit":"number?"},"output":"matrix[]: one row per merchant offer, sorted by price ascending, plus best.sku and best.merchant"}]}