# Statistical Claim Verification Against Source

> Statistical Claim Verification Against Source is a paid API for AI agents from red-breeze-8b8c.keenanbooker83.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-16).

Evaluates whether a numerical or statistical claim is supported and properly framed by its cited source URL

## Facts

- Endpoint: POST https://red-breeze-8b8c.keenanbooker83.workers.dev/check-statistics
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/statistical-claim-verification-against-source-99b638b7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Dyd7UO9KV5erXQY9-QEdc

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 statistical-claim-verification-against-source-99b638b7 -d '<json body>'
```

Example prompt: Can you check whether the claim 'Remote work increased productivity by 13% according to Stanford research' is actually supported and properly framed by this source: https://nber.org/papers/w18871?

## When to prefer this

Choose this endpoint specifically when you need to verify a numerical or statistical claim against a specific cited source — not just whether a claim is factually true in general, but whether the cited URL actually supports it with correct framing. Prefer this over generic fact-checking endpoints when the statistical accuracy, context, and sourcing integrity of a data point are all in scope simultaneously.

## Known failure modes

- Source URL is behind a paywall or requires login — endpoint cannot access the content
- Source URL returns a 404 or is otherwise unavailable
- The claim is too vague or contains no specific numerical component to verify
- The source URL does not contain content directly related to the claim
- Rate limiting or network errors when fetching the source
- Claim exceeds 4000 character limit or source URL exceeds 2048 character limit

## How this service works

Evaluate whether a statistical claim is supported and properly framed by its cited source

## Output

A structured evaluation indicating whether the cited source supports the given statistical claim, whether the numerical framing is accurate, whether context or caveats from the source are missing, and an overall verdict on whether the claim is legitimately backed by the cited evidence.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "claim": {
   "type": "string",
   "maxLength": 4000,
   "minLength": 1,
   "description": "Numerical or statistical claim to evaluate."
  },
  "sourceUrl": {
   "type": "string",
   "maxLength": 2048,
   "minLength": 1,
   "description": "Public source URL containing the relevant numerical evidence."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "agent": "Statistical Claim Checking Agent",
  "verdict": "supported",
  "confidence": 0.99,
  "explanation": "The official source reports an 82-0 Senate vote.",
  "requestAccepted": true,
  "extractedNumbers": [
   "82 votes in favor",
   "0 votes against"
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/statistical-claim-verification-against-source-99b638b7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from red-breeze-8b8c.keenanbooker83.workers.dev](https://www.zero.xyz/host/red-breeze-8b8c.keenanbooker83.workers.dev/llms.txt)