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AttestPage Citation Verifier – Multi-URL
x402
AttestPage Citation Verifier – Multi-URL is a paid API for AI agents from s2h6qt73jtzlgbgnnfacln2poq.srv.us, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-30).
Verifies up to 10 quote-and-URL pairs against live web pages, returning exact, fuzzy, or passage-based match results with a single signed receipt.
Price / call$0.1
Success—
StatusUnknown
How this service works
Checks up to 10 quote and URL pairs on live pages: exact, fuzzy or none, one receipt. US$0.10 per call; POST pairs.
Output
For each citation pair, the endpoint returns a match status (exact, fuzzy, none, or passage evidence), similarity scores, text offsets within the page, and a single timestamped signed receipt covering the entire batch. Dead domains are reported as results rather than errors unless all URLs fail to resolve.
Example use cases
AI hallucination audit for research report
“I have five citations from a report our AI assistant wrote — can you check each quote against its linked URL using fuzzy matching to see if the text actually appears on those pages? I want to catch any hallucinated sources before we publish.”
Legal brief citation integrity check
“Before we file this brief, can you verify that all eight of these quoted passages actually appear word-for-word on the cited court document pages? Use exact match mode so we catch anything that doesn't match precisely.”
Paraphrased claim evidence retrieval
“I'm fact-checking a claim that a page supports a particular argument — can you use passages mode to pull the three most relevant passages from the source URL that share the most words with my claim, so I can judge whether it's actually supported?”
Technical details
Endpoint
POSThttps://s2h6qt73jtzlgbgnnfacln2poq.srv.us/v1/verify/citations?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to verify multiple citation-URL pairs in a single call with one shared signed receipt. It is more cost-effective than calling the single-citation endpoint repeatedly when you have 2–10 pairs to check. Prefer the single-citation endpoint ($0.01) for one-off checks, or the single-page multi-quote endpoint ($0.02) when all quotes reference the same page. Use this endpoint when citations span different URLs and you need a batch attestation.
Side effects
- 422 Unprocessable Entity if none of the submitted URLs resolve (no charge)
- Individual citations marked as 'gone' or 'unreadable' if the page is inaccessible but others succeed
- Quote exceeds 1,000 characters after normalisation — rejected
- URL exceeds 2,048 characters — rejected
- match 'passages' used with case_sensitive:true — rejected
- threshold below 0.5 or above 1.0 — rejected
- More than 10 citations submitted — rejected
- Payment failure via x402 protocol — request not processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| match | string | For every citation: 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). |
| citations | array | 1 to 10 citations. Each URL is fetched once however many quotes cite it. Dead domains are reported as results; if none resolves, 422 and no charge. |
| threshold | number | Fuzzy similarity needed, default 0.9. |
| case_sensitive | boolean | Default false; must be false with match "passages". |
Tags
x402
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