Verify a public product, classified, marketplace or auction listing immediately before an
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.
20000 (raw units)
price
1
calls / 30d
1
unique payers
2026-08-30
updated
Provider
live-listing-proof.mattskowronis.workers.dev · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0x22B3D4485C8Dcd8FC4840a7570664747c9055530",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "20000",
"maxTimeoutSeconds": 300
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"body": {
"claim": "This item is still available for under $30,000 in Maine.",
"url": "https://example.com/listing/123"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"checked_at": "2026-08-17T13:53:08.000Z",
"claim_supported": true,
"confidence": 0.96,
"content_hash": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
"evidence": [
"Listed at $27,500",
"Location: Portland, Maine",
"Status: Available"
],
"final_url": "https://example.com/listing/123",
"location": "Portland, Maine",
"price": {
"amount": 27500,
"currency": "USD",
"text": "$27,500"
},
"retrieval_method": "direct_http",
"source_status": "verified",
"title": "2018 Cabin Cruiser",
"verdict": "active"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"claim": {
"description": "Natural-language claim about current availability, price, and/or location.",
"maxLength": 2000,
"minLength": 3,
"type": "string"
},
"url": {
"description": "Public HTTP or HTTPS listing page URL to inspect.",
"maxLength": 2048,
"type": "string"
}
},
"required": [
"url",
"claim"
]
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"checked_at": {
"type": "string"
},
"claim_supported": {
"type": "boolean"
},
"confidence": {
"maximum": 1,
"minimum": 0,
"type": "number"
},
"content_hash": {
"description": "SHA-256 hex of rendered HTML.",
"type": "string"
},
"evidence": {
"items": {
"maxLength": 240,
"type": "string"
},
"maxItems": 3,
"type": "array"
},
"final_url": {
"type": "string"
},
"location": {
"type": [
"string",
"null"
]
},
"price": {
"anyOf": [
{
"additionalProperties": false,
"properties": {
"amount": {
"description": "Numeric amount in major units.",
"type": "number"
},
"currency": {
"description": "ISO-4217 currency code.",
"type": "string"
},
"text": {
"description": "Price as printed on the page.",
"type": "string"
}
},
"required": [
"amount",
"currency",
"text"
],
"type": "object"
},
{
"type": "null"
}
]
},
"retrieval_method": {
"enum": [
"direct_http",
"browser_run",
"official_api",
"unsupported"
],
"type": "string"
},
"source_status": {
"enum": [
"verified",
"removed",
"blocked",
"unreachable",
"unsupported",
"insufficient_evidence"
],
"type": "string"
},
"title": {
"type": [
"string",
"null"
]
},
"verdict": {
"enum": [
"active",
"sold",
"expired",
"removed",
"blocked",
"uncertain"
],
"type": "string"
}
},
"required": [
"verdict",
"claim_supported",
"final_url",
"title",
"price",
"location",
"evidence",
"checked_at",
"content_hash",
"confidence",
"source_status",
"retrieval_method"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
curl
curl "https://live-listing-proof.mattskowronis.workers.dev/v1/verify" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://live-listing-proof.mattskowronis.workers.dev/v1/verify");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://live-listing-proof.mattskowronis.workers.dev/v1/verify")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/13599.json, and this resource appears in /discovery/resources and /discovery/search.