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Agent Evidence API
x402
Agent Evidence API is a paid API for AI agents from agent-evidence-api.thx93.workers.dev, paid per call via x402, $0.003/call, status down (last checked 2026-10-15).
Verifies a claim against up to 5 public web URLs, returning cited passages that support, contradict, or fail to settle the claim, each with a source URL, retrieval timestamp, and content hash.
Price / call$0.003
Success—
StatusDown
How this service works
Verify a claim 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.
Output
Returns cited evidence excerpts from the provided URLs, each labeled as supporting, contradicting, or inconclusive relative to the claim, along with the source URL, retrieval timestamp, and a content hash for auditability. If no content is retrieved, no charge is incurred.
Example use cases
Fact-checking a news claim
“I saw a headline saying 'US inflation hit 9% in June 2022' — can you verify that against these three sources and show me the exact passages that support or contradict it: https://www.bls.gov/news.release/cpi.nr0.htm, https://www.federalreserve.gov, and https://apnews.com?”
Research citation validation
“I'm writing a paper and want to confirm the claim 'deep learning outperforms classical ML on image classification benchmarks' — can you check it against these URLs and pull the relevant cited excerpts with source details: https://paperswithbenchmarks.ai, https://arxiv.org/abs/1409.4842?”
Debunking a viral social media claim
“Someone is saying 'coffee causes cancer according to WHO' — can you check whether that's actually supported or contradicted by https://www.who.int and https://www.cancer.org and give me the specific passages with retrieval timestamps?”
Technical details
Endpoint
POSThttps://agent-evidence-api.thx93.workers.dev/v1/evidence?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need traceable, cited evidence for or against a specific claim, grounded in particular URLs the user or agent specifies. It is ideal when auditability matters (content hash, retrieval time) and when you want verdict-tagged passages rather than a generic web search summary. Prefer it over general search APIs when you already have candidate sources and need structured evidence extraction with citation metadata.
Side effects
- URL is inaccessible, paywalled, or returns no retrievable content — passage not returned, no charge
- Claim is too ambiguous for clear support/contradiction classification — returned as inconclusive
- More than 5 URLs submitted — request rejected or truncated
- Source content has changed since retrieval — hash reflects retrieval-time snapshot only
- Network timeout or worker error — HTTP 5xx returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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