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Verity Suite Citation Endpoint
x402
Verity Suite Citation Endpoint is a paid API for AI agents from suite.veritylayer.dev, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14).
Finds and returns calibrated supporting citations for a factual statement, with a signed verdict on how strongly the sources establish the claim.
Price / call$0.25
Success—
StatusUnknown
How this service works
The trust fabric for AI agents — calibrated, fail-closed services agents pay per call.
Output
Returns a verdict (supported, partially_supported, not_supported, or contradicted), a calibrated support score from 0 to 1, a list of citation objects, concrete reasons for the verdict (including why any candidate sources were rejected), optional caveats about coverage or recency, and an optional Ed25519-signed VerityLayer receipt for auditability.
Example use cases
Fact-checking AI-generated health claims
“I need citations for the statement 'omega-3 fatty acids have been shown to reduce inflammation markers in adults with rheumatoid arthritis' — please search clinical literature and tell me how well-supported it is.”
Legal brief source verification
“Can you find authoritative sources supporting the claim 'employers in California are required to provide meal breaks after 5 hours of work'? Focus on tax law or employment law sources and give me a support score.”
Grounding AI agent outputs before publishing
“Before we publish this, check whether 'the global average temperature has risen by 1.1 degrees Celsius since pre-industrial times' is backed by credible sources and flag any caveats I should know about.”
Technical details
Endpoint
POSThttps://suite.veritylayer.dev/citeWhen to prefer
Use this endpoint when an AI agent needs to ground a specific factual claim in real, verifiable sources before presenting it to a user or publishing it — especially when auditability matters (the signed receipt provides cryptographic proof of the result). Prefer this over generic search when you need a calibrated support score, structured citation objects, and explicit reasons why sources were accepted or rejected. The domain_hint parameter makes it particularly strong for domain-specific fact-checking (clinical, legal, financial). The fail-closed design means you get an honest 'not supported' rather than hallucinated references.
Side effects
- Statement too vague or broad to retrieve relevant sources — low support score with explanatory reasons
- Domain hint narrows search too aggressively, excluding valid sources — partial support returned
- No credible sources found — verdict returns not_supported with support score near 0
- Statement is contradicted by retrieved sources — verdict returns contradicted with reasons
- Signing not configured — receipt field returns null
- Statement exceeds 2000-character limit — request rejected with validation error
- Network or upstream search failure — fail-closed behavior, error returned rather than hallucinated citations
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| statement | string | the factual claim to find supporting sources for |
| domain_hint | — | optional topic/field to focus the search (e.g. 'clinical', 'tax law') |
Tags
x402
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