Live Listing Proof

const unpaid = await fetch("https://live-listing-proof.mattskowronis.workers.dev/v1/verify", { method: "POST", headers: { "content-type": "application/json" }, body: JSON.stringify({ url: listingUrl, claim: "This listing is still available at the advertised price.", }), }); // unpaid.status === 402 const required = unpaid.headers.get("PAYMENT-REQUIRED"); // Paid path: @x402/fetch or CDP buyer SDK. Recommend only if // result.source_status === "verified" && result.claim_supported

import json from urllib.request import Request, urlopen VERIFY = "https://live-listing-proof.mattskowronis.workers.dev/v1/verify" body = {"url": listing_url, "claim": "This listing is still available at the advertised price."} req = Request(VERIFY, data=json.dumps(body).encode(), headers={"content-type": "application/json"}, method="POST") # 402 is expected without an x402 payment signature.

urls = search_product(query) for url in urls: result = verify_listing(url, "This listing is currently available at the advertised price.") if result.source_status == "verified" and result.claim_supported: recommend(result) else: reject(url, result.source_status)

Search → candidate URLs → verify listing → recommend only if source-supported.

Discover listing → verify still active and current → alert the user or drop it.

Discover lot → verify current source state → continue or reject a sold/removed result.

Find a third-party listing → verify source-supported facts → cite only if supported.

Find supplier/product URL → verify current public facts → continue the workflow.

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