# Verity Suite Quick Cite

> Verity Suite Quick Cite is a paid API for AI agents from verity-suite.onrender.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).

Finds and returns calibrated supporting citations for a factual statement, with a graded verdict on how strongly the retrieved sources establish the claim

## Facts

- Endpoint: POST https://verity-suite.onrender.com/cite/quick
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/verity-suite-quick-cite-fa1f47c6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AF4FdNXwJ0FvVDmhPKhQ_

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability verity-suite-quick-cite-fa1f47c6 -d '<json body>'
```

Example prompt: Can you find real supporting citations for this claim: 'Metformin reduces all-cause mortality in type 2 diabetics' — use the clinical domain hint and tell me how strongly the sources actually back it up?

## When to prefer this

Use this endpoint when an AI agent needs to ground a specific factual claim in real, retrieved sources rather than relying on parametric knowledge — especially for high-stakes domains like clinical, legal, or scientific assertions where hallucination risk is unacceptable. Prefer this over generic web search when you need a calibrated confidence score and structured verdict alongside citations, or when you need fail-closed behavior (no_sources_found rather than a fabricated answer). Best for single, discrete factual claims rather than open-ended research queries.

## Known failure modes

- No qualifying sources retrieved — returns verdict 'no_sources_found' with empty citations array and support score near 0
- Statement is too vague or ambiguous for targeted retrieval — low support score with explanatory reason
- Domain hint too narrow causes relevant sources to be excluded — partially_supported verdict with caveat
- Retrieved sources contradict the statement — verdict 'contradicted' with support score 0 and reasons listing contradicting evidence
- Malformed input (missing required 'statement' field) — returns HTTP 4xx validation error
- Service unavailable or payment not accepted — returns HTTP 402 or 5xx error

## 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 / contradicted), a calibrated 0–1 support score, a list of actual retrieved citation identifiers with what each specifically supports, concrete reasons for the verdict including why any candidates were rejected, and caveats about scope limits, partial coverage, conflicting evidence, or recency concerns.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "statement"
 ],
 "properties": {
  "statement": {
   "type": "string",
   "description": "the factual claim to find supporting sources for"
  },
  "domain_hint": {
   "type": "string",
   "description": "optional topic/field to focus the search (e.g. 'clinical', 'tax law')"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "title": "citation_out",
 "required": [
  "verdict",
  "support",
  "citations",
  "reasons"
 ],
 "properties": {
  "caveats": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "title": "Caveats",
   "description": "scope limits, partial coverage, conflicting evidence, or recency/quality concerns the caller should know"
  },
  "reasons": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "title": "Reasons",
   "description": "concrete grounds for the verdict, including why any candidate sources were rejected (off-topic, unverifiable, low-quality, vague, contradicts)"
  },
  "support": {
   "type": "number",
   "title": "Support",
   "maximum": 1,
   "minimum": 0,
   "description": "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)"
  },
  "verdict": {
   "enum": [
    "supported",
    "partially_supported",
    "no_sources_found",
    "contradicted"
   ],
   "type": "string",
   "title": "Verdict",
   "description": "whether real retrieved sources actually support the statement; no_sources_found is the safe/uncertain value"
  },
  "citations": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "title": "Citations",
   "description": "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."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/verity-suite-quick-cite-fa1f47c6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from verity-suite.onrender.com](https://www.zero.xyz/host/verity-suite.onrender.com/llms.txt)