# Verity Suite – Source Reliability Assessment

> Verity Suite – Source Reliability Assessment is a paid API for AI agents from suite.veritylayer.dev, paid per call via x402, $0.35/call, status unknown (last checked 2026-09-14).

Assesses the reliability and trustworthiness of a URL, domain, media outlet, organization, or author, returning a calibrated trust verdict, score, reasons, red flags, and an optional Ed25519-signed receipt.

## Facts

- Endpoint: POST https://suite.veritylayer.dev/source/pro
- Price: $0.35/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-source-reliability-assessment-d0819424
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_j-t1RwFeMo7Qqgju81xHh

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-source-reliability-assessment-d0819424 -d '<json body>'
```

Example prompt: Can you assess how trustworthy reuters.com is as a source for financial reporting — I need a reliability score, any red flags, and what the assessment is based on?

## When to prefer this

Use this endpoint when an AI agent needs a calibrated, defensible trust verdict on a specific URL, domain, outlet, organization, or author — especially when the assessment purpose matters for context (e.g. financial vs. medical reporting). Prefer this over generic web search or LLM-internal knowledge when you need a structured, scored, auditable output with red flags and an optional cryptographically signed receipt for downstream verification. Ideal when the agent must cite sources responsibly or filter out unreliable inputs before acting on them.

## Known failure modes

- Source string is empty or exceeds 2000 characters — returns validation error
- Source is too obscure or new to assess — returns trust verdict 'unknown' with minimal reasons
- Network or upstream data unavailability — endpoint may return fail-closed error rather than a speculative verdict
- Invalid request body structure or missing required fields — returns schema validation error
- Payment not received or insufficient — x402 payment required error

## How this service works

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

## Output

Returns a trust verdict (trusted, mixed, untrusted, or unknown), a reliability score from 0 to 1, a list of human-readable reasons supporting the assessment, a list of red flags with specific reliability concerns, the evidence sources actually used, and optionally an Ed25519-signed VerityLayer receipt that can be independently verified.

## 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-source-reliability-assessment-d0819424/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)