# Canon Fact-Checking & Claim Comparison

> Canon Fact-Checking & Claim Comparison is a paid API for AI agents from veri.orbonomy.xyz, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).

Verifies an array of claims against academic sources and fact-checking databases, returning validation results for each claim

## Facts

- Endpoint: POST https://veri.orbonomy.xyz/api/compare
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/canon-fact-checking-claim-comparison-d1df1426
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aWkMIC8UmFN2ewydY79sN

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 canon-fact-checking-claim-comparison-d1df1426 -d '<json body>'
```

Example prompt: Can you fact-check these three claims for me: '97% of climate scientists agree on human-caused warming', 'The Great Wall of China is visible from space', and 'Vitamin C cures the common cold'?

## When to prefer this

Choose this endpoint when an AI agent needs to programmatically verify factual claims, especially against academic or scientific sources. Ideal for content pipelines that need fact-checking before publishing, research assistants that need to ground claims in evidence, or any workflow where hallucination detection or claim validation is critical. Pays per call in USDC on Base, so best suited for targeted claim verification rather than broad exploratory research.

## Known failure modes

- Empty claims array returns validation error
- Malformed claims array fails schema validation
- Ambiguous or unfalsifiable claims may return inconclusive results
- Service unavailable if payment of 0.1 USDC on Base is not processed
- Rate limiting if too many claims submitted simultaneously
- Very niche or highly specialized claims may lack academic coverage

## How this service works

Fact-checking and academic research for AI agents. Verify claims, search papers, explore journals. USDC on Base.

## Output

Returns a success flag plus per-claim verification results, likely including whether each claim is supported or refuted, relevant academic sources or citations, and confidence indicators based on the available evidence.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "claims"
 ],
 "properties": {
  "claims": {
   "type": "array"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/canon-fact-checking-claim-comparison-d1df1426/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from veri.orbonomy.xyz](https://www.zero.xyz/host/veri.orbonomy.xyz/llms.txt)