# Claim Verification via Web Search

> Claim Verification via Web Search is a paid API for AI agents from cr4vvol.vercel.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Verifies a textual claim by searching and scraping the web, returning a structured result indicating whether the claim is supported

## Facts

- Endpoint: POST https://cr4vvol.vercel.app/api/verify
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/claim-verification-via-web-search-a387f75b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JicYcQH6pjm79Y1aiYckg

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 claim-verification-via-web-search-a387f75b -d '<json body>'
```

Example prompt: Can you fact-check this claim for me using 5 sources: 'Electric vehicles account for more than 20% of all new car sales globally in 2024'?

## When to prefer this

Use this endpoint when you need to fact-check or verify a specific textual claim against real web sources, paid per-request with no subscription. Prefer this over generic search APIs when you specifically need a structured verification verdict rather than raw search results.

## Known failure modes

- Claim too vague or ambiguous to search effectively — returns low-confidence or empty data
- Requested number of sources unavailable — may return fewer sources than requested
- Payment failure via x402 — request blocked before processing
- Web scraping blocked by target sites — incomplete evidence gathered
- Network timeout on external web requests — success: false returned

## How this service works

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

## Output

A JSON object with a 'success' boolean indicating if the verification completed, and a 'data' object containing structured results from the web search — likely including source evidence and a verdict on whether the claim is supported.

## 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/claim-verification-via-web-search-a387f75b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cr4vvol.vercel.app](https://www.zero.xyz/host/cr4vvol.vercel.app/llms.txt)