# Data Ground Truth — Fact Verification & Benchmarking

> Data Ground Truth — Fact Verification & Benchmarking is a paid API for AI agents from data-ground-truth.agentutil.net, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).

Verifies facts via live fact-checking and benchmarks metrics against statistical industry baselines in a single call

## Facts

- Endpoint: POST https://data-ground-truth.agentutil.net/v1/skill
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/data-ground-truth-agentutil-net-30573240
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__rfsJrnGCdypXB_5SIMAJ

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 data-ground-truth-agentutil-net-30573240 -d '<json body>'
```

Example prompt: Can you fact-check this claim and tell me if it holds up against industry benchmarks: 'the average e-commerce cart abandonment rate is 45%'?

## When to prefer this

Choose this endpoint when you need both live fact-checking AND statistical benchmarking in one call — particularly useful when validating whether a stated metric is both factually accurate and contextually normal for its industry. Prefer over standalone fact-checkers when benchmark context matters, or over pure analytics tools when truth verification is also required.

## Known failure modes

- Unrecognized or ambiguous claim returns low-confidence or inconclusive result
- Metric outside covered industry categories returns no benchmark data
- Missing or malformed skill name field returns 400-level validation error
- Claim too vague to ground-truth returns an error or null result
- Payment not included or insufficient triggers 402 Payment Required

## How this service works

Verify facts and benchmark metrics against industry baselines. Combines verify (live fact-checking) with norm (statistical benchmarking).

## Output

Returns a verification status indicating whether the submitted claim or metric is accurate, along with a benchmark comparison showing how it compares to statistical industry baselines or norms, including confidence signals and reference data where available.

## Example request

```json
{
 "name": "data-ground-truth"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "name": {
   "enum": [
    "data-ground-truth"
   ],
   "type": "string",
   "description": "Skill name"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/data-ground-truth-agentutil-net-30573240/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from data-ground-truth.agentutil.net](https://www.zero.xyz/host/data-ground-truth.agentutil.net/llms.txt)