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AttestPage: Verify Quotes and Citations on Live Web Pages
x402
AttestPage: Verify Quotes and Citations on Live Web Pages is a paid API for AI agents from vehcdj664efetfrsolne5umanq.srv.us, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-17).
Verifies whether quoted text from a document actually appears on the cited live web pages, returning scored match evidence with context.
Price / call$0.1
Success—
StatusUnknown
How this service works
Signed evidence about web pages, for AI agents. Ask whether a quote appears on a page or check every citation in an answer at once, fetch a page and learn…
Output
Returns a JSON object with per-pair results including: match type (exact/fuzzy/passages), similarity score (0–1), character offsets in both the document and the source page, surrounding context snippet, HTTP status of the fetched page, occurrence count, and content kind. Also includes a summary of how many pairs matched exactly, fuzzily, or failed, plus a cryptographic receipt for signed attestation.
Example use cases
AI answer hallucination audit
“I just got a long answer from an AI assistant with several quotes and links. Can you verify all the citations using fuzzy matching to see which quotes actually appear on their source pages?”
Research report citation check
“Before I publish this research summary, please verify all the quoted passages against their cited URLs — use exact matching and tell me which ones pass and which ones fail.”
Journalistic source verification
“I've written a news article with 5 quotes each linked to a source. Can you check whether each quote actually appears on the linked page, using passages mode so I can judge the evidence myself?”
Technical details
Endpoint
POSThttps://vehcdj664efetfrsolne5umanq.srv.us/v1/verify/document?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need cryptographically signed, per-citation evidence that quoted text genuinely appears on a live web page — ideal for auditing AI-generated content for hallucinations, verifying journalistic sources, or fact-checking research documents. Prefer it over manual spot-checking when a document has multiple citations to verify at once, or when downstream users need a verifiable receipt of the check.
Side effects
- Page is behind a paywall or login — returns non-200 HTTP status
- URL redirects to a different page than cited — final_url differs from url
- Quote is too short (below min_words) — result marked as too_short
- Similarity below threshold — result marked as no_match
- Page fails to load or times out — result marked as failed
- Document exceeds 60000 bytes — request rejected
- Rate limiting or payment failure — 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| part | integer | 0-based part to check, default 0; call POST /v1/verify/document/preview first to see how many parts there are. |
| match | string | For every pair: exact; fuzzy (default), which also accepts small differences; or passages, for a paraphrased claim: the 3 passages that share most of its words, scored, as evidence for you to judge (not a verdict). With "passages", each sentence that carries a link is a claim. |
| format | string | markdown (default), text (only bare URLs and [n] references are links) or html (<a href> links, <blockquote> and <q> quotes; other tags are dropped). |
| document | string | The answer or report as written, 1 character to 60000 bytes (UTF-8). Its quotes and their links are found by fixed rules (extractor doc-v1). |
| min_words | integer | A quoted span with fewer words is skipped as too_short (default 4). |
| part_size | integer | Pairs per part, default 10. A free trial call takes at most the size in extensions.trial.info.max_batch_items of the 402 offer. |
| threshold | number | Fuzzy similarity needed, default 0.9. |
| case_sensitive | boolean | Default false; must be false with match "passages". |
Output
Schema · Response
{
"type": "json",
"example": {
"part": 0,
"tier": "paid",
"pages": [],
"parts": 1,
"receipt": "eyJ…",
"results": [
{
"end": 478,
"url": "https://www.who.int/health-topics/air-pollution",
"page": 0,
"pair": 0,
"match": "fuzzy",
"quote": "Air pollution kills an estimated seven million people every year",
"score": 0.96,
"start": 412,
"context": "…",
"doc_end": 74,
"doc_start": 10,
"final_url": "https://www.who.int/health-topics/air-pollution",
"http_status": 200,
"occurrences": 1,
"content_kind": "real"
},
{
"end": 234,
"url": "https://www.iana.org/help/example-domains",
"page": 1,
"pair": 1,
"match": "exact",
"quote": "These domains may be used as illustrative examples in documents",
"score": 1,
"start": 171,
"context": "…",
"doc_end": 200,
"doc_start": 137,
"final_url": "https://www.iana.org/help/example-domains",
"http_status": 200,
"occurrences": 1,
"content_kind": "real"
}
],
"summary": {
"none": 0,
"exact": 1,
"fuzzy": 1,
"failed": 0
},
"extractor": "doc-v1",
"pairs_total": 2,
"document_sha256": "…"
}
}Tags
x402
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