# Verity Suite – Quick Source Trust Assessment

> Verity Suite – Quick Source Trust Assessment is a paid API for AI agents from suite.veritylayer.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-13).

Assesses the reliability and trustworthiness of a URL, domain, outlet, organization, or author, returning a calibrated trust verdict, score, and signed receipt.

## Facts

- Endpoint: POST https://suite.veritylayer.dev/source/quick
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/verity-suite-quick-source-trust-assessment-e2b4296b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QaAARWOlvYdI2jhzA-3C1

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-source-trust-assessment-e2b4296b -d '<json body>'
```

Example prompt: Can you check how trustworthy reuters.com is as a source for financial news coverage — I need a reliability score and any red flags before I use it in my report?

## When to prefer this

Use this endpoint when an AI agent needs a fast, calibrated, and cryptographically receipted trust verdict on a specific source before citing, sharing, or acting on information from it. Prefer this over manual search when you need a structured score with auditable provenance, especially in automated pipelines where fail-closed behavior and signed receipts matter. It is distinct from full content-fact-checking endpoints — it assesses the source entity itself, not a specific claim.

## Known failure modes

- Source string is empty or exceeds 2000 characters — validation error
- Source is obscure or brand-new with no discoverable evidence — verdict returns 'unknown' with limited reasons
- Network or upstream data unavailability causes service to fail-closed rather than return a guess
- Invalid JSON body or missing required fields returns a 400-level error
- Payment not authorized or insufficient USDC balance causes 402 Payment Required

## How this service works

The trust fabric for AI agents — calibrated, fail-closed services agents pay per call.

## Output

Returns a trust verdict (one of: trusted, mixed, untrusted, unknown), a numeric reliability score from 0 to 1, a list of human-readable reasons explaining the assessment, a list of red flags (specific reliability concerns), evidence sources consulted, and optionally an Ed25519-signed VerityLayer receipt for auditability.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "source": {
   "type": "string",
   "title": "Source",
   "maxLength": 2000,
   "minLength": 1,
   "description": "a URL, domain, outlet, org, or author to assess"
  },
  "purpose": {
   "anyOf": [
    {
     "type": "string",
     "maxLength": 2000
    },
    {
     "type": "null"
    }
   ],
   "title": "Purpose",
   "default": null,
   "description": "what the source is being trusted for"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/verity-suite-quick-source-trust-assessment-e2b4296b/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)