# AttestPage: Verify Quotes and Citations on Live Web Pages > 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. ## Facts - Endpoint: POST https://vehcdj664efetfrsolne5umanq.srv.us/v1/verify/document?utm_source=zero.xyz - Price: $0.1/call - Payment: x402 - Status: unknown - Last checked: 2026-10-17 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/attestpage-verify-quotes-and-citations-on-live-web-pages-8b29a1a1 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cDp6ptLblXiQkIjs2d8J_ Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. ## How to call it through Zero Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`): ```sh zero fetch --capability attestpage-verify-quotes-and-citations-on-live-web-pages-8b29a1a1 -d '' ``` Example prompt: Check every quote and citation in this report I wrote — use fuzzy matching with a 0.9 threshold — and tell me which ones actually appear on their linked web pages: [paste document here]. ## When to prefer this 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. ## Known failure modes - 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 ## 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. ## Request schema (JSON Schema) ```json { "type": "object", "properties": { "part": { "type": "integer", "minimum": 0, "description": "0-based part to check, default 0; call POST /v1/verify/document/preview first to see how many parts there are." }, "match": { "enum": [ "exact", "fuzzy", "passages" ], "type": "string", "description": "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": { "enum": [ "markdown", "text", "html" ], "type": "string", "description": "markdown (default), text (only bare URLs and [n] references are links) or html ( links,
and quotes; other tags are dropped)." }, "document": { "type": "string", "description": "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": { "type": "integer", "maximum": 20, "minimum": 1, "description": "A quoted span with fewer words is skipped as too_short (default 4)." }, "part_size": { "type": "integer", "maximum": 10, "minimum": 1, "description": "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": { "type": "number", "maximum": 1, "minimum": 0.5, "description": "Fuzzy similarity needed, default 0.9." }, "case_sensitive": { "type": "boolean", "description": "Default false; must be false with match \"passages\"." } } } ``` ## Response schema (JSON Schema) ```json { "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": "…" } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/attestpage-verify-quotes-and-citations-on-live-web-pages-8b29a1a1/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from vehcdj664efetfrsolne5umanq.srv.us](https://www.zero.xyz/host/vehcdj664efetfrsolne5umanq.srv.us/llms.txt)