Verify a public product, classified, marketplace or auction listing immediately
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.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
343 msmedian answer time
$0.02listed price per call
$0.02price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://live-listing-proof.mattskowronis.workers.dev/v1/verify
| Category | Commerce and shopping |
|---|---|
| Provider host | live-listing-proof.mattskowronis.workers.dev |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.02 | 343 ms |
Example input (from the provider)
{
"body": {
"claim": "This item is still available for under $30,000 in Maine.",
"url": "https://example.com/listing/123"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$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"
}