Federal Agency Lookup API: Resolve a US federal agency name to its Federal Register slug
Resolve a US federal agency name to its Federal Register slug — searches all ~470 agencies, returns slug, display name, short name and parent. Free. The slug is the agency parameter every other AnswerPool regulation endpoint takes.
Free — no key, no signup, rate-limited to 60 calls per minute per client.
How do you call it?
GET /v1/regs/agencies — product id
reg_agency_lookup. Over MCP, call answerpool_get with
product_id=reg_agency_lookup.
curl "https://answerpool.io/v1/regs/agencies?q=securities"Live call: https://answerpool.io/v1/regs/agencies?q=securities · JSON sample: /v1/samples/reg_agency_lookup
What does the answer look like?
A representative response, the same static sample served at /v1/samples/reg_agency_lookup.
as_of | 2026-09-02T14:00:00Z |
|---|---|
count | 1 |
refresh_after | 2026-09-18T00:00:00.000Z |
agencies
| slug | name | short_name | parent_slug |
|---|---|---|---|
| securities-and-exchange-commission | Securities and Exchange Commission | SEC | — |
The same sample as raw JSON
{
"as_of": "2026-09-02T14:00:00Z",
"count": 1,
"agencies": [
{
"slug": "securities-and-exchange-commission",
"name": "Securities and Exchange Commission",
"short_name": "SEC",
"parent_slug": null
}
],
"refresh_after": "2026-09-18T00:00:00.000Z"
}How fresh is it, and where does the data come from?
The fastest source behind this answer can change daily, so every response carries a refresh_after timestamp — right now it would be 2026-09-18T00:00:00.000Z. 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
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 have an agency name or acronym and need the canonical slug for filtered rule-tracking calls.
What you skip building
- agencies endpoint pagination
- slug-guessing errors
When should you not use it?
State or local agencies — the Federal Register covers US federal only.
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