# Canon Summary

> Canon Summary is a paid API for AI agents from v0-canon.orbonomy.xyz, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Generates a fact-checked academic summary on a given topic in a specified language, drawing on research papers and journals.

## Facts

- Endpoint: POST https://v0-canon.orbonomy.xyz/api/summary
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/canon-summary-2b82325a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2lcwZ5njFG0AoQQE5wgH0

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-summary-2b82325a -d '<json body>'
```

Example prompt: Can you pull a Canon research summary in English on the long-term cardiovascular effects of PFAS exposure — I want to verify whether recent claims about heart disease risk are backed by peer-reviewed literature?

## When to prefer this

Choose Canon when an agent needs to verify factual claims, explore peer-reviewed research, or produce academically grounded summaries on a topic — especially when credibility and citation-backed accuracy matter more than speed or breadth. Prefer this over general web search when the goal is fact-checking against scientific or academic literature rather than retrieving raw web content.

## Known failure modes

- Missing required 'topic' or 'lang' fields returns a validation error
- Obscure or highly niche topics may yield thin or low-confidence summaries
- Payment failure via x402/USDC on Base blocks the request before processing
- Non-standard language codes in 'lang' may cause unexpected behavior or errors
- Ambiguous topic strings may return generalized rather than targeted summaries

## 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 (implied) a summary of fact-checked, academically grounded information on the requested topic in the specified language.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "lang",
  "topic"
 ],
 "properties": {
  "lang": {
   "type": "string"
  },
  "topic": {
   "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-summary-2b82325a/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)