# Canon – Timeline Endpoint

> Canon – Timeline Endpoint is a paid API for AI agents from v0-canon.orbonomy.xyz, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Retrieves a fact-checked, research-grounded timeline of events or developments on a given topic, drawing from academic and journalistic sources.

## Facts

- Endpoint: POST https://v0-canon.orbonomy.xyz/api/timeline
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/canon-timeline-endpoint-356a5d4b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ueYA2AScjMTHAIZIvtK5f

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-timeline-endpoint-356a5d4b -d '<json body>'
```

Example prompt: Can you pull up a fact-checked timeline of the development of mRNA vaccine technology, with sources, using Canon?

## When to prefer this

Use this endpoint when you need a chronologically ordered, source-backed overview of how a topic has developed over time — especially for academic research, fact-checking claims about historical sequences, or building a verified narrative around a subject. Prefer this over generic web search when citation quality and factual accuracy matter more than recency or breadth.

## Known failure modes

- Topic string is empty or too vague — returns success:false or empty timeline
- Topic is outside Canon's indexed knowledge domains — may return sparse or no results
- Payment failure (insufficient USDC on Base) — 402 response before processing
- Network timeout if source retrieval is slow — request may hang or return partial data
- Malformed request body (missing required 'topic' field) — 400 error

## How this service works

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

## Output

A structured object with a success flag and, on success, a chronological timeline of verified events, milestones, or findings related to the queried topic, grounded in academic and journalistic sources.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "topic"
 ],
 "properties": {
  "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-timeline-endpoint-356a5d4b/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)