# Canon Claim Verifier

> Canon Claim Verifier is a paid API for AI agents from v0-canon.orbonomy.xyz, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).

Verifies a factual claim using fact-checking and academic research sources, returning a verification result

## Facts

- Endpoint: POST https://v0-canon.orbonomy.xyz/api/verify
- 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-claim-verifier-ae7834dc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jYB0HGjHGyGkDvFxrCpmr

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-claim-verifier-ae7834dc -d '<json body>'
```

Example prompt: Can you fact-check this claim for me in English: 'The human brain uses approximately 20% of the body's total energy'?

## When to prefer this

Use Canon when an AI agent needs to fact-check a specific claim or assertion against academic and journalistic sources, especially when accuracy and source credibility matter. Prefer this over general web search when the task is explicitly to verify truth value of a statement rather than gather background information.

## Known failure modes

- Missing required 'claim' field returns validation error
- Missing required 'lang' field returns validation error
- Payment not received or insufficient USDC causes 402 Payment Required
- Unverifiable or ambiguous claims may return success:false or inconclusive result
- Rate limiting or server errors may return 5xx responses

## How this service works

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

## Output

Returns a JSON object with a 'success' boolean indicating whether the verification call was processed. The response is expected to include whether the claim could be verified, though full schema detail beyond the success flag is limited.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "lang",
  "claim"
 ],
 "properties": {
  "lang": {
   "type": "string"
  },
  "claim": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/canon-claim-verifier-ae7834dc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from v0-canon.orbonomy.xyz](https://www.zero.xyz/host/v0-canon.orbonomy.xyz/llms.txt)