# CortexAssay Federal Register Rules Search

> CortexAssay Federal Register Rules Search is a paid API for AI agents from cortexassay.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Searches and retrieves recent U.S. federal regulatory rules and proposed rules from the Federal Register, filtered by keyword, agency, date range, and significance.

## Facts

- Endpoint: GET https://cortexassay.com/v1/regs/rules
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cortexassay-federal-register-rules-search-10052add
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DxDp1IIXzqz6DMB5dZCkZ

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 cortexassay-federal-register-rules-search-10052add
```

Example prompt: Can you pull the latest proposed rules from the Securities and Exchange Commission published in the last 30 days — especially any marked as significant under E.O. 12866 — and show me their titles, comment deadlines, and abstracts?

## When to prefer this

Use this endpoint when you need machine-readable, structured Federal Register regulatory data with clean schemas, per-call micropayment pricing, and provenance metadata — especially for AI agents that need to monitor, filter, or analyze U.S. federal rulemaking by agency, keyword, date, or significance level without building a Federal Register scraper yourself.

## Known failure modes

- No documents returned if term or agency slug is misspelled or too narrow
- Agency slug must match Federal Register's exact slug format or filter is ignored
- Date range filters accept ISO dates only; malformed dates may return defaults or errors
- Payment required (x402) — missing or invalid payment header returns 402
- Result set capped at 100; pagination not supported in single call
- Very recent documents may not yet be indexed

## How this service works

Machine-consumable research and technology intelligence computed from open data (OpenAlex, CC0). Pay per call with x402. Schemas, prices and provenance are machine-readable.

## Output

Returns a JSON object with the query timestamp, total matching documents count, and an array of regulatory documents each containing: document number, title, type (rule/proposed rule/notice), action description, publishing agencies, publication date, effective date, comment close date, days until comment close, significance flag, abstract, docket IDs, regulation ID numbers, CFR references, topics, Federal Register URL, and alert flags (e.g. 'significant', 'comments_close_soon').

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "as_of": "2026-08-30T18:00:00Z",
  "count": 1,
  "documents": [
   {
    "url": "https://www.federalregister.gov/documents/2026/08/21/2026-15872",
    "type": "Proposed Rule",
    "flags": [
     "significant",
     "comments_close_soon"
    ],
    "title": "Regulation Crypto Assets",
    "action": "Proposed rule",
    "topics": [
     "securities"
    ],
    "abstract": "The Commission proposes a framework for crypto asset securities...",
    "agencies": [
     "Securities and Exchange Commission"
    ],
    "docket_ids": [
     "S7-12-26"
    ],
    "significant": true,
    "effective_on": null,
    "cfr_references": [
     "17 CFR 230"
    ],
    "document_number": "2026-15872",
    "publication_date": "2026-08-21",
    "comments_close_on": "2026-10-20",
    "days_to_effective": null,
    "days_to_comment_close": 51,
    "regulation_id_numbers": [
     "3235-AN70"
    ]
   }
  ],
  "total_matching": 14
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cortexassay-federal-register-rules-search-10052add/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cortexassay.com](https://www.zero.xyz/host/cortexassay.com/llms.txt)