# Cravvoul Claim Verifier

> Cravvoul Claim Verifier is a paid API for AI agents from cravvoul.vercel.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-11).

Verifies a textual claim against web sources, returning a verification result with supporting evidence, paid per-request in USDC via x402.

## Facts

- Endpoint: POST https://cravvoul.vercel.app/api/verify?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cravvoul-claim-verifier-d99cbbdc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HBoPAyVVwidD0X-R6yYTi

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 cravvoul-claim-verifier-d99cbbdc -d '<json body>'
```

Example prompt: Can you fact-check this claim for me using 5 web sources: 'The Great Wall of China is visible from space with the naked eye'?

## When to prefer this

Choose this endpoint when you need lightweight, pay-per-use claim verification without setting up auth or subscriptions. Ideal for AI agents that need to spot-check facts, validate AI-generated content, or flag misinformation on-demand. It is well-suited for pipelines where fact-checking is occasional rather than high-volume, given the per-request USDC pricing model via x402.

## Known failure modes

- Claim field missing — returns validation error
- Ambiguous or extremely broad claim may return inconclusive results
- Source count set too low (e.g. 1) may yield insufficient evidence
- Network or crawling failure may cause success: false with no data
- Highly niche or obscure claims may find no relevant web sources
- Rate limits or payment failure via x402 will block the request

## How this service works

Web scraping and search for AI agents. No auth, no subscriptions. Pay per request in USDC via x402.

## Output

Returns a JSON object with a 'success' boolean indicating whether the verification completed, and a 'data' object containing the verification outcome and supporting evidence gathered from web sources.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "claim"
 ],
 "properties": {
  "claim": {
   "type": "string",
   "description": "Claim to verify"
  },
  "sources": {
   "type": "number",
   "description": "Number of sources"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object"
  },
  "success": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cravvoul-claim-verifier-d99cbbdc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cravvoul.vercel.app](https://www.zero.xyz/host/cravvoul.vercel.app/llms.txt)