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Agent Evidence API — Claim Verification
x402
Agent Evidence API — Claim Verification is a paid API for AI agents from agent-evidence.thx93.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).
Verifies a claim or fact-checks a statement by retrieving cited evidence passages (supporting, contradicting, or inconclusive) from up to 5 provided URLs.
Price / call$0.01
Success—
StatusUnknown
How this service works
Verify a claim or fact check a statement against public web sources: send a question and up to 5 URLs, get cited evidence - passages that support, contradict or fail to settle it. Claim verification with a citation for every excerpt: source URL, retrieval time, content hash. Never charges when nothing is retrieved. Free to evaluate: the `sample` tool returns one real response at no cost, so you can judge the output before paying for your own question.
Output
Returns a set of evidence passages from the provided URLs, each labeled as supporting, contradicting, or failing to settle the claim, along with the source URL, retrieval timestamp, and content hash for auditability. No charge is incurred if no relevant content is retrieved.
Example use cases
Verify a news article claim
“I just read that 'the FDA approved mRNA vaccines for children under 5 in June 2022' — can you check that claim against https://www.fda.gov/vaccines and https://www.cdc.gov/covid-vaccines and tell me what passages support or contradict it?”
Fact-check a product marketing claim
“Our competitor's site claims 'our battery lasts 48 hours on a single charge' — can you verify that against https://competitor.com/specs and https://rtings.com/competitor-battery-review and pull the exact excerpts that support or contradict it?”
Research validation for an academic assertion
“I need to verify the statement 'global average sea surface temperature rose by 0.13°C per decade since 1901' — please check it against https://noaa.gov/climate-report and https://ipcc.ch/ar6 and give me cited passages with source URLs and retrieval times.”
Technical details
Endpoint
POSThttps://agent-evidence.thx93.dev/v1/weather/forecast?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need verifiable, cited evidence for a specific claim drawn from a defined set of source URLs — ideal for fact-checking workflows, due diligence, content moderation, or research validation where provenance (source URL, retrieval time, content hash) matters. Prefer it over general web search when you need traceable excerpts rather than ranked links, and when you already have candidate source URLs to check against.
Side effects
- No content retrieved from provided URLs — no charge applied, empty evidence set returned
- URL unreachable or blocked — passage omitted for that source
- Claim is ambiguous — passages may be labeled inconclusive
- Fewer than expected URLs processed if some return errors
- Rate limiting or timeout on external URL fetch
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"periods": [
{
"name": "Today",
"windSpeed": "5 to 10 mph",
"temperature": 68,
"windDirection": "W",
"temperatureUnit": "F",
"detailedForecast": "Sunny."
}
],
"latitude": 37.7749,
"longitude": -122.4194
}
}Tags
x402
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