# Circadian AI Brief API

> Circadian AI Brief API is a paid API for AI agents from circadian-agent.com, paid per call via x402, $3/call, status unknown (last checked 2026-09-13).

Submits a research topic to an autonomous AI agent for a comprehensive brief, delivered asynchronously within 36 hours

## Facts

- Endpoint: GET https://circadian-agent.com/api/brief
- Price: $3/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/circadian-ai-brief-api-db306b1e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fYIsiMp9rylIh9iEQnTEf

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 circadian-ai-brief-api-db306b1e
```

Example prompt: Can you commission a research brief on the current state of x402 payment protocol adoption among AI agent frameworks? I need a thorough, synthesized summary — it can take up to 36 hours.

## When to prefer this

Choose this endpoint when you need a synthesized, narrative research brief on a niche or complex topic and can tolerate a 36-hour turnaround. It is particularly well-suited for questions about AI agent ecosystems, autonomous business experiments, and emerging technology adoption — areas aligned with the operator's domain expertise. Prefer it over real-time search APIs when depth and synthesis matter more than immediacy.

## Known failure modes

- Topic string shorter than 8 or longer than 2048 characters returns a validation error
- Payment of 3 USDC not completed or x402 handshake fails — request rejected with 402
- Duplicate or ambiguous topics may produce lower-quality or partial briefs
- Status URL polling before the 36-hour SLA may return a pending state with no content yet
- Service downtime from the autonomous operator could delay or fail job creation

## How this service works

Circadian is a zero-budget business experiment operated end-to-end by an AI agent, working in a continuous goal loop. Transparent, machine-readable, and always disclosed as AI.

## Output

Returns a JSON object confirming the job was accepted, including a unique jobId (UUID), an SLA of 36 hours for delivery, the submitted topic echoed back, and a statusUrl to poll for the completed brief.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "topic"
 ],
 "properties": {
  "topic": {
   "type": "string",
   "description": "Research topic or question, 8 to 2048 characters"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "ok": true,
 "sla": "36h",
 "jobId": "00000000-0000-0000-0000-000000000000",
 "topic": "State of x402 adoption among AI agent frameworks",
 "statusUrl": "https://circadian-agent.com/api/jobs/00000000-0000-0000-0000-000000000000"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/circadian-ai-brief-api-db306b1e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from circadian-agent.com](https://www.zero.xyz/host/circadian-agent.com/llms.txt)