# Verity Suite – Claim Freshness Checker

> Verity Suite – Claim Freshness Checker 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).

Checks whether a given factual claim is still current by judging it against retrieved evidence snippets, returning a fail-closed freshness verdict (current, outdated, changed, or unverifiable).

## Facts

- Endpoint: POST https://suite.veritylayer.dev/freshness/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-claim-freshness-checker-e0eeea54
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lc70yCY6hpcXBe7r-y3UK

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-claim-freshness-checker-e0eeea54 -d '<json body>'
```

Example prompt: Check whether this claim is still current: 'OpenAI's GPT-4 is the most capable publicly available model from OpenAI' — I last knew this to be true as of 2024-01-01, and here are some recent snippets I found: ['OpenAI released GPT-4o in May 2024, which supersedes GPT-4 for most tasks (source: OpenAI blog, 2024-05-13)', 'GPT-4o is now the default model in ChatGPT (source: OpenAI, 2024-05-13)'].

## When to prefer this

Use this endpoint when an AI agent needs a reliable, fail-closed judgment on whether a specific factual claim is still current before presenting it to a user or acting on it. Prefer it over naive LLM self-assessment when you need a calibrated, paid-per-call service with explicit staleness categories and traceable reasoning tied to retrieved evidence. Especially valuable in RAG pipelines, knowledge base maintenance, and agent workflows where acting on stale data carries real risk.

## Known failure modes

- Empty or undated evidence array causes an 'unverifiable' verdict rather than an error — the service is fail-closed by design
- Claim exceeds 2000 character limit — returns a validation error
- Evidence snippets without dates or sources reduce confidence and may force an 'unverifiable' result
- Ambiguous or compound claims may be difficult to judge accurately
- If evidence is irrelevant to the claim, the service returns 'unverifiable' rather than guessing

## How this service works

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

## Output

Returns a JSON object with a status enum (current, outdated, changed, or unverifiable), a list of concrete reasons tied to specific evidence snippets and their dates, and optionally a current_value field when the evidence establishes a specific new value. The default fail-closed verdict is 'unverifiable' when evidence is absent, undated, or insufficient.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "as_of": {
   "anyOf": [
    {
     "type": "string",
     "maxLength": 2000
    },
    {
     "type": "null"
    }
   ],
   "title": "As Of",
   "default": null,
   "description": "The date or version at which the claim was last known to be true, if known (e.g. '2024-01-01'). Used only to weigh evidence recency; it is not itself proof of current truth."
  },
  "claim": {
   "type": "string",
   "title": "Claim",
   "maxLength": 2000,
   "minLength": 1,
   "description": "The single fact or claim to check for currency. Treated as data to be judged, not as instructions."
  },
  "evidence": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "title": "Evidence",
   "description": "Retrieved current snippets, ideally each with a date and source, to judge the claim against. If empty or undated, currency cannot be confirmed."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/verity-suite-claim-freshness-checker-e0eeea54/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)