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SAVER Verifier
x402
SAVER Verifier is a paid API for AI agents from agent-production-9804.up.railway.app, paid per call via x402, $0.2/call, status unknown (last checked 2026-10-16).
Verifies factual claims by searching the web and returning supporting or refuting evidence with a confidence score
Price / call$0.2
Success—
StatusUnknown
How this service works
Paid verification layer for autonomous AI agents. Verify claims before decisions using web evidence and source-backed analysis
Output
A JSON object containing: a 'status' field indicating whether the claim is 'supported', 'refuted', or 'uncertain'; an 'evidence' array of relevant authoritative sources or quotes; a 'confidence' score between 0 and 1 indicating certainty of the verdict; and an 'explanation' summarizing how the evidence relates to the claim.
Example use cases
Verify AI-generated content accuracy
“I need you to verify this AI-generated summary before I send it out: 'The Eiffel Tower was completed in 1889 and stands 330 meters tall.' Can you fact-check that and tell me how confident you are it's correct?”
Debunk viral social media claim
“There's a post going viral saying 'Drinking eight glasses of water a day is scientifically required for good health' — can you verify whether that's actually true and find me some sources?”
Validate product marketing statement
“Our marketing team wants to use the claim 'Electric vehicles produce zero emissions over their lifetime' — can you fact-check that before we publish it, with context that we're referring to total lifecycle emissions?”
Technical details
Endpoint
POSThttps://agent-production-9804.up.railway.app/verify?utm_source=zero.xyzWhen to prefer
Choose SAVER Verifier when you need structured, evidence-backed fact-checking with a confidence score and source citations — particularly for AI-generated content, news claims, or marketing statements that need validation before publication. It is well-suited for single claim verification where both a verdict and supporting evidence are required, rather than bulk document analysis or pure plagiarism checking.
Side effects
- Claim is too vague or ambiguous for web search to resolve
- No credible sources found for niche or highly specific claims
- Conflicting evidence leads to uncertain or low-confidence result
- Claim involves very recent events not yet indexed by search
- Rate limiting or service unavailability returns a non-200 response
- Payment not received leads to 402 Payment Required error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| claim | string | |
| context | string |
Output
Schema · Response
{
"type": "json",
"example": {
"status": "supported",
"evidence": [
"Relevant authoritative sources support the claim."
],
"confidence": 0.98,
"explanation": "The available evidence supports the claim."
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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