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Verity Suite Citation & Fact-Check Endpoint
x402
Verity Suite Citation & Fact-Check Endpoint is a paid API for AI agents from verity-suite.onrender.com, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).
Searches for and returns calibrated citations that support or contradict a factual claim, returning a verdict, support score, and source list
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 enum (supported, partially_supported, no_sources_found, or contradicted), a calibrated support score from 0 to 1, a list of specific citations retrieved that bear on the statement, concrete reasons for the verdict, and optional caveats about scope limits, conflicting evidence, or recency concerns.
Example use cases
Example prompt
“Can you check whether the claim 'mRNA vaccines have been shown to reduce COVID-19 hospitalization rates by over 90%' is actually supported by real sources? Focus the search on clinical evidence.”
Technical details
Endpoint
POSThttps://verity-suite.onrender.com/citeWhen to prefer
Use this endpoint when an AI agent needs to back a specific factual claim with real, retrieved citations before presenting it to a user, publishing content, or making a decision — especially when a calibrated support score and explicit rejection reasoning are required. Prefer this over generic web search when you need a structured, fail-closed verdict with traceable sources rather than raw search results.
Side effects
- No supporting sources found — returns verdict 'no_sources_found' with empty citations and support score near 0
- Claim is contradicted by retrieved sources — returns verdict 'contradicted' with reasons explaining the contradiction
- Ambiguous or overly broad statement returns 'partially_supported' with low support score and caveats
- Domain hint does not narrow results effectively, returning off-topic or low-quality sources that are rejected
- Payment not processed — call rejected before execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| statementrequired | string | the factual claim to find supporting sources for |
| domain_hint | string | optional topic/field to focus the search (e.g. 'clinical', 'tax law') |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| caveats | array | scope limits, partial coverage, conflicting evidence, or recency/quality concerns the caller should know |
| reasonsrequired | array | concrete grounds for the verdict, including why any candidate sources were rejected (off-topic, unverifiable, low-quality, vague, contradicts) |
| supportrequired | number | calibrated 0..1: how strongly the retrieved sources actually establish the statement (0=none retrieved or contradicted, ~0.3-0.7=partial, 0.8-1.0=explicit and on-point) |
| verdictrequired | string | whether real retrieved sources actually support the statement; no_sources_found is the safe/uncertain value |
| citationsrequired | array | only sources actually retrieved this call and verified to bear on the statement; each entry = source identifier/title + what specifically it supports. Empty if none qualify. |
Tags
x402
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