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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, $0.02/call, status unknown (last checked 2026-10-17).
Fetches a live web page and returns signed evidence about whether specified quotes or claims actually appear on that page, with match scoring and context snippets.
Price / call$0.02
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 containing per-quote results (match type, similarity score, start/end character positions, context snippet, occurrence count, normalized SHA-256 of the matched text), a summary of exact/fuzzy/no-match counts, the page's HTTP status and content kind, and a cryptographically signed receipt for auditability.
Example use cases
AI answer citation audit
“I just got an answer from an AI that cited three quotes from https://www.who.int/news/item/some-article — can you verify that all three quotes actually appear on that page? Here they are: 'global health emergency declared', 'over 5 million confirmed cases', 'vaccine rollout begins in Q1'. Use fuzzy matching.”
Fact-checking a news claim
“Someone is claiming that https://www.nytimes.com/2024/01/15/some-story says 'the company admitted to systemic fraud' — can you verify whether that exact phrase actually appears on that page?”
Research paper source validation
“I'm reviewing a research summary that paraphrases a source. Can you check https://pubs.acs.org/doi/some-paper and find the 3 passages that best support this claim: 'carbon emissions from aviation have doubled since 2000'? Use passages mode so I can judge the evidence myself.”
Technical details
Endpoint
POSThttps://vehcdj664efetfrsolne5umanq.srv.us/v1/verify/quotes?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need cryptographically signed, auditable evidence that a specific quote or claim appears (or does not appear) on a live web page — especially for AI output citation checking, fact-checking workflows, or compliance auditing where a simple scrape is insufficient. Prefer it over generic web scraping when you need structured per-quote verdicts, similarity scores, and a signed receipt. Use passages mode when verifying paraphrased claims rather than verbatim quotes.
Side effects
- Page returns non-200 HTTP status (e.g. 404, 403, 500) — reported in page.http_status
- Page is behind a paywall or requires authentication — content may be incomplete or unavailable
- URL exceeds 2,048 characters — request rejected
- More than 20 quotes submitted — request rejected
- Quote exceeds 1,000 characters after normalization — item rejected
- Threshold below 0.5 — request rejected
- case_sensitive set to true with passages mode — request rejected
- Page content is not real (e.g. bot-detection page, empty response) — content_kind flags this
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | http(s) URL of the page to check (max 2,048 characters). Fetched once for all the quotes. |
| match | string | For every quote: 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). |
| quotes | array | 1 to 20 quotes to look for on that page, or with match "passages" claims to find support for (each max 1,000 characters after normalisation). One price for the call however many. |
| 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": {
"page": {
"http_status": 200,
"content_kind": "real"
},
"tier": "paid",
"receipt": "eyJ…",
"results": [
{
"end": 234,
"match": "exact",
"score": 1,
"start": 171,
"context": "...maintained for documentation purposes. These domains may be used as illustrative examples in documents without prior coordination with us...",
"occurrences": 1,
"normalised_sha256": "…"
},
{
"end": 269,
"match": "exact",
"score": 1,
"start": 235,
"context": "...illustrative examples in documents without prior coordination with us. They are not available for registration...",
"occurrences": 1,
"normalised_sha256": "…"
}
],
"summary": {
"none": 0,
"exact": 2,
"fuzzy": 0,
"failed": 0
}
}
}Tags
x402
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