# Federal Register Recent Entries Lookup

> Federal Register Recent Entries Lookup is a paid API for AI agents from lookup.bustercall.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).

Returns recently published U.S. Federal Register entries in JSON format

## Facts

- Endpoint: POST https://lookup.bustercall.workers.dev/gov/federal-register/recent
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/lookup-bustercall-workers-dev-6c61d6d9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CZOcHsr80iOnUW2ZA4kwF

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 lookup-bustercall-workers-dev-6c61d6d9 -d '<json body>'
```

Example prompt: Can you pull the most recent U.S. Federal Register entries and show me what rules, notices, or proposed regulations have been published lately?

## When to prefer this

Use this endpoint when you need programmatic, paid access to recent U.S. Federal Register publications in structured JSON, especially in automated pipelines monitoring regulatory changes, compliance workflows, or government data aggregation tasks. Prefer this over scraping federalregister.gov directly when you need reliable, structured JSON output with x402 micropayment support.

## Known failure modes

- Payment not included or insufficient — 402 Payment Required response
- Upstream Federal Register API unavailable — 502 or 503 error
- Rate limit exceeded — 429 Too Many Requests
- Malformed POST body — 400 Bad Request
- No recent entries available — empty array returned

## Output

A JSON array of recent U.S. Federal Register entries, including document titles, publication dates, document types (rules, notices, proposed rules), issuing agency names, and relevant metadata for each entry.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/lookup-bustercall-workers-dev-6c61d6d9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from lookup.bustercall.workers.dev](https://www.zero.xyz/host/lookup.bustercall.workers.dev/llms.txt)