Rule Impact Map API: Map a Federal Register rule to the public companies whose SEC filings

Map a Federal Register rule to the public companies whose SEC filings cite its docket, RIN or CFR part — cross-corpus full-text join, ranked by citation strength with filing counts and dates. One call replaces holding and joining both corpora.

$0.05 per call — pay with prepaid card credits (Authorization: Bearer ck_live_…, packs from $1) or with USDC over x402: call it, get 402 with the price, retry signed. Failed calls are never charged.

How do you call it?

GET /v1/impact/rule — product id impact_rule_companies. Over MCP, call answerpool_get with product_id=impact_rule_companies.

curl "https://answerpool.io/v1/impact/rule?document_number=2026-12341"

# with a prepaid credit key
curl -H "Authorization: Bearer ck_live_..." "https://answerpool.io/v1/impact/rule?document_number=2026-12341"

Live call: https://answerpool.io/v1/impact/rule?document_number=2026-12341 · JSON sample: /v1/samples/impact_rule_companies

What does the answer look like?

A representative response, the same static sample served at /v1/samples/impact_rule_companies.

companies

{
 "as_of": "2026-09-02T20:00:00Z",
 "document_number": "2026-12341",
 "title": "Cybersecurity Risk Management Rule",
 "agencies": [
  "Securities and Exchange Commission"
 ],
 "publication_date": "2026-08-30",
 "significant": true,
 "identifiers_searched": [
  "SEC-2026-001",
  "3235-AN00",
  "17 CFR 240"
 ],
 "total_filing_matches": 42,
 "count": 1,
 "companies": [
  {
   "cik": "0000320193",
   "company": "Apple Inc.",
   "filings": 3,
   "forms": [
    "10-K",
    "8-K"
   ],
   "latest_filed": "2026-08-15",
   "matched": [
    "17 CFR 240",
    "SEC-2026-001"
   ]
  }
 ],
 "refresh_after": "2026-09-17T11:15:00.000Z"
}

How fresh is it, and where does the data come from?

The fastest source behind this answer can change every 15 minutes, so every response carries a refresh_after timestamp — right now it would be 2026-09-17T11:15:00.000Z. Schedule the next call on that value rather than on a guess.

• Federal Register (US federal public domain) — upstream: https://www.federalregister.gov/api/v1
• SEC EDGAR (US federal public domain) — upstream: https://efts.sec.gov

Method version 0.1.0 · serving cache 1 day · every response carries a result_id you can resolve at /v1/provenance.

When should you use it?

You hold a Federal Register document number and need the likely-affected issuer list.

What you skip building

• dual-corpus infrastructure
• EDGAR full-text query syntax
• identifier extraction

When should you not use it?

Legal determinations of exposure — citations indicate relevance, not obligation.

Where else can you find this?

• Catalog entry (JSON, free)
• OpenAPI schema — input and output types, prices, the 402 flow
• llms.txt — every product in one plain-text document