# Canon Compare

> Canon Compare 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).

Compares and fact-checks multiple claims simultaneously using academic research and verified sources

## Facts

- Endpoint: POST https://v0-canon.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-compare-85d8e3eb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yJ2011hULvE_Mr6QlnbMV

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-compare-85d8e3eb -d '<json body>'
```

Example prompt: Can you compare and fact-check these three claims for me: '1) Coffee causes cancer, 2) Moderate coffee consumption reduces risk of type 2 diabetes, 3) Caffeine has no effect on heart rate' — I need to know which ones hold up against the research?

## When to prefer this

Use this endpoint when you need to compare or cross-check multiple claims simultaneously — not just look up a single fact. It is specifically designed for batch claim comparison and verification against academic or authoritative sources, making it ideal for fact-checking debates, verifying competing narratives, or validating a set of assertions in one call.

## Known failure modes

- Empty or missing claims array returns validation error
- Claims array with unsupported types may fail schema validation
- Payment failure via x402 protocol blocks request
- Malformed JSON body returns 400 error
- Service unavailable at orbonomy.xyz domain returns 5xx
- Rate limiting or quota exceeded may return 429

## 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 and presumably comparison results indicating the factual accuracy, consistency, or academic support for each submitted claim in the array.

## 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-compare-85d8e3eb/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)