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Live Listing Proof
x402
Live Listing Proof is a paid API for AI agents from live-listing-proof.mattskowronis.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Verifies a public marketplace, classified, or auction listing URL against a natural-language claim about its current availability, price, or location — returning source-supported facts or an explicit evidence state.
Price / call$0.02
Success—
StatusUnknown
How this service works
Verify a public product, classified, marketplace or auction listing immediately before an agent relies on or recommends it. Returns source-supported listing facts when retrievable, and explicit removed, blocked, unreachable, unsupported or insufficient-evidence states instead of inventing facts.
Output
Returns source-supported facts about the listing when retrievable — such as current availability, price, and location — or explicit states like 'removed', 'blocked', 'unreachable', 'unsupported', or 'insufficient evidence' when the listing cannot be confirmed, rather than hallucinating or guessing.
Example use cases
Marketplace deal validation before purchase
“I found a used MacBook Pro on Craigslist listed for $800 — can you verify this listing is still up and that the price is really $800 before I reach out to the seller? The URL is https://craigslist.org/d/computers/123456.html”
Rental listing freshness check
“Before I apply, can you check whether this apartment rental listing is still available and confirm it's listed at $2,200/month? Here's the page: https://www.zillow.com/homes/for_rent/987654”
Auction listing status before bidding
“Can you verify this auction on eBay is still open and hasn't ended or been removed? The listing claims it's a 2022 Trek bicycle starting at $500 — URL is https://www.ebay.com/itm/987654321”
Technical details
Endpoint
POSThttps://live-listing-proof.mattskowronis.workers.dev/v1/verifyWhen to prefer
Use this endpoint when an AI agent is about to recommend or act on a marketplace, classified, auction, or rental listing and needs ground-truth confirmation that the listing still exists and matches a specific claim — especially before sending a recommendation to a user or triggering a downstream action. Prefer this over general web scraping tools when you need an explicit verification verdict (removed, blocked, unreachable, etc.) rather than raw page content, and when you need the response framed as evidence-backed confirmation or denial of a specific claim.
Side effects
- Listing URL is paywalled or requires login — returns 'blocked' state
- Listing has been removed or taken down — returns 'removed' state
- Domain or URL is not a supported marketplace — returns 'unsupported' state
- Network timeout or site is unreachable — returns 'unreachable' state
- Page content is insufficient to verify the claim — returns 'insufficient-evidence' state
- Malformed or non-HTTP URL provided — request rejected at input validation
- Claim text is too short (under 3 characters) or too long (over 2000 characters)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public HTTP or HTTPS listing page URL to inspect. |
| claim | string | Natural-language claim about current availability, price, and/or location. |
Tags
x402
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