# Verity Suite Citation Quick

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

Given a factual statement, retrieves and evaluates supporting sources, returning a calibrated verdict, support score, citations, and a cryptographically signed receipt.

## Facts

- Endpoint: POST https://suite.veritylayer.dev/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-citation-quick-48401668
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hcjqILsfbvJLiSsb3F168

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-citation-quick-48401668 -d '<json body>'
```

Example prompt: Can you find supporting citations for the claim 'mRNA vaccines do not alter human DNA' — focus the search on clinical or biomedical sources — and give me a calibrated verdict on how well the sources actually back it up?

## When to prefer this

Use this endpoint when an AI agent needs to ground a factual claim in real, retrievable sources and receive a machine-readable verdict with a calibrated confidence score. It is especially valuable when downstream actions depend on the truthfulness of a claim, when a cryptographically signed receipt is needed for audit or accountability, or when a domain-specific focus (e.g. clinical, legal) is required. Prefer it over generic web search when you need structured citation output, a calibrated support score, and a fail-closed trust signal rather than a raw list of search results.

## Known failure modes

- No relevant sources found — returns 'not_supported' verdict with support score near 0
- Statement is ambiguous or too broad — verdict may be 'partially_supported' with low confidence
- Domain hint narrows search too aggressively — relevant sources outside the hint may be missed
- Statement exceeds 2000-character limit — request is rejected
- Signing not configured — receipt field returns null
- Network or upstream search failure — request fails closed rather than returning a false positive

## 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, not_supported, or contradicted), a calibrated 0–1 support score, a list of citations, reasons explaining the verdict (including why sources were rejected), optional caveats about coverage or recency, and an optional Ed25519-signed VerityLayer receipt that can be independently verified.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "statement": {
   "type": "string",
   "title": "Statement",
   "maxLength": 2000,
   "minLength": 1,
   "description": "the factual claim to find supporting sources for"
  },
  "domain_hint": {
   "anyOf": [
    {
     "type": "string",
     "maxLength": 2000
    },
    {
     "type": "null"
    }
   ],
   "title": "Domain Hint",
   "default": null,
   "description": "optional topic/field to focus the search (e.g. 'clinical', 'tax law')"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/verity-suite-citation-quick-48401668/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suite.veritylayer.dev](https://www.zero.xyz/host/suite.veritylayer.dev/llms.txt)