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Evidence Fingerprint & Claim Verification
x402
Evidence Fingerprint & Claim Verification is a paid API for AI agents from x402-gateway-production-1f21.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-22).
Fetches a webpage and deterministically verifies whether specified claims are supported by the page content, returning a fingerprint for evidentiary use.
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-payable x402 utilities for hashing, Base64, UUID generation, unit and timezone conversion, realtime crypto market data, webpage/document extraction, URL-to-Markdown, metadata, RAG ingestion and deterministic website change detection.
Output
Returns a JSON object with status 'ready' and evidence fingerprint data indicating which claims were found supported in the fetched page content, usable as tamper-evident proof of webpage state at call time.
Example use cases
Fact-check a news article claim
“Verify that the article at https://techcrunch.com/2024/05/01/openai-gpt5-launch actually supports the claim 'OpenAI launched GPT-5 in May 2024' and return an evidence fingerprint.”
Audit a supplier's compliance page
“Check whether https://acmecorp.com/compliance supports these claims: 'ISO 27001 certified' and 'SOC 2 Type II compliant' — I need the fingerprint for our vendor audit records.”
Price or feature claim verification
“Go to https://stripe.com/pricing and verify whether it supports the claim 'Stripe charges 2.9% plus 30 cents per transaction' — I want documented evidence for a client proposal.”
Technical details
Endpoint
POSThttps://x402-gateway-production-1f21.up.railway.app/commerce/evidence-fingerprint?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need machine-verifiable, deterministic proof that a specific URL supports a stated claim — especially for compliance auditing, fact-checking pipelines, legal evidence gathering, or RAG ingestion workflows where source attribution must be verifiable. Prefer it over generic scraping endpoints when the output must serve as structured evidence rather than raw content.
Side effects
- Source URL is unreachable or returns non-200 status — claim verification fails with connectivity error
- URL points to a paywalled or bot-blocked page — content cannot be extracted
- Claims array is empty or exceeds 20 items — schema validation error
- Claim text exceeds 600 characters per item — rejected by input schema
- Page content is dynamic/JS-rendered and differs from raw HTTP response — claims may not match
- Malformed URI in source_url field — immediate validation rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"status": "ready"
}
}Tags
x402
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