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Website Claim Checker
x402
Website Claim Checker is a paid API for AI agents from website-evidence-pack.blissful.chatgpt.site, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-22).
Verifies whether a specific factual claim is supported by evidence found on a given website, returning a verdict and source-linked citations.
Price / call$0.05
Success—
StatusUnknown
How this service works
Focused x402 tools for website CRO audits, public company contacts, exact claim evidence checks, and source-linked research. From $0.02 USDC on Base.
Output
Returns a JSON object containing a verdict ('supported', 'unsupported', or 'unresolved'), an array of citations each with an id, a quoted passage, the source URL, and the page section where the evidence was found, plus the list of pages audited, the resolved URL, the audit timestamp, any limitations, and the schema version.
Example use cases
Verify competitor marketing claim
“A competitor says 'We guarantee 99.9% uptime' on their website — can you check acmecorp.com to see if that claim is actually there and quote the exact text that supports or contradicts it?”
Due diligence on acquisition target
“We're about to acquire StartupXYZ and they claim 'SOC 2 Type II certified' on their site. Can you verify that startupxyz.com actually states this and give me the source quote and page it appears on?”
Ad copy compliance check
“Our legal team needs to confirm that our website actually says 'No hidden fees, ever' before we use it in an ad — can you check ourcompany.com for that exact claim and return any supporting evidence or flag if it's missing?”
Technical details
Endpoint
POSThttps://website-evidence-pack.blissful.chatgpt.site/api/x402/website-claim-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need exact, source-linked evidence that a specific claim appears verbatim or near-verbatim on a public website — especially for compliance, due diligence, competitive intelligence, or ad-copy verification. Prefer it over general web search when you need a structured audit trail with direct quotes and page-level citations rather than snippets from a search engine.
Side effects
- Claim not found on the site returns verdict 'unresolved' rather than 'unsupported'
- Paywalled or JavaScript-heavy pages may not be fully audited
- Redirects to unexpected domains result in resolved_url differing from requested_url
- Ambiguous or paraphrased claims may not match exact on-page text, yielding unresolved verdict
- Site blocking crawlers returns empty pages_audited and unresolved verdict
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Absolute public HTTP(S) homepage URL. |
| claim | string | Specific business claim to check against first-party website text. |
| max_pages | integer | Maximum public same-site HTML pages to inspect. |
Output
Schema · Response
{
"type": "json",
"example": {
"claim": "This domain is for use in illustrative examples in documents.",
"verdict": "supported",
"citations": [
{
"id": "evidence-1",
"claim": "Published purpose",
"quote": "This domain is for use in illustrative examples in documents.",
"source_url": "https://example.com/",
"page_section": "Main content"
}
],
"audited_at": "2026-07-21T12:00:00.000Z",
"limitations": [
"Support requires an exact first-party quote; absence is unresolved."
],
"resolved_url": "https://example.com/",
"pages_audited": [
"https://example.com/"
],
"requested_url": "https://example.com/",
"schema_version": "2026-07-24"
}
}Tags
x402
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