AttestPage Quote Verification

x402

AttestPage Quote Verification is a paid API for AI agents from vehcdj664efetfrsolne5umanq.srv.us, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Verifies whether a specific quote or claim appears on a live web page and returns signed, auditable evidence of the result

Price / call$0.01

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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

A JSON object containing the HTTP status of the fetched page, a result block with match type, similarity score, character start/end offsets of the match, surrounding context text, occurrence count, and a normalized SHA-256 of the matched text, plus a signed JWT receipt that serves as auditable evidence of the verification.

Example use cases

AI answer citation check

“I just got a response from an AI that cited this quote from https://www.who.int/news/item/2023-report: 'Global life expectancy fell by 1.8 years between 2019 and 2021.' Can you verify whether that quote actually appears on that page using fuzzy matching and give me a signed receipt?”

Research report footnote audit

“I'm reviewing a research report and it claims that https://www.nature.com/articles/d41586-023-00001-9 says 'AI systems now outperform humans on several standard benchmarks.' Can you verify that sentence appears on that page verbatim with exact matching?”

Claim support passage finder

“Check the page at https://climate.nasa.gov/evidence/ and find the 3 passages that best support the claim 'Human activity is the primary driver of recent climate change' — use passages mode so I can judge the evidence myself.”

Technical details

Endpoint

POSThttps://vehcdj664efetfrsolne5umanq.srv.us/v1/verify/quote?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need cryptographically signed, auditable evidence that a specific quote or claim appears on a live web page — particularly for AI-generated answer fact-checking, citation auditing, or compliance workflows where a verifiable receipt matters. It supports exact, fuzzy, and passages matching modes, making it suitable for verbatim checks, near-duplicate detection, and paraphrase evidence gathering. Prefer it over generic web scrapers when you need a trust artifact (the signed receipt) rather than just raw page content.

Side effects

Page returns non-200 HTTP status — result reflects the HTTP error and no match is returned
URL is unreachable or times out — endpoint returns an error indicating the page could not be fetched
Quote exceeds 1,000 character limit after normalization — request is rejected with a validation error
case_sensitive set to true with match=passages — rejected as an invalid parameter combination
Fuzzy threshold below 0.5 — rejected with a validation error
Page content is behind a login or CAPTCHA — real content cannot be accessed, content_kind may indicate non-real

Input

Schema · Request body

Field	Type	Description
url	string	http(s) URL of the page to check (max 2,048 characters).
match	string	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).
quote	string	Text to look for on the page, or with match "passages" the claim to find support for (max 1,000 characters after normalisation).
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",
    "result": {
      "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": "…"
    },
    "receipt": "eyJ…"
  }
}

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