AnswerPool

NAICS Code Lookup API: NAICS industry code resolution: text or code prefix in, code + — USAspending and NIH RePORTER

NAICS industry code resolution: text or code prefix in, code + description + retired flag out. The identifier layer for any US federal contracting analysis. Free, no key.

Free — no key, no signup, rate-limited to 60 calls per minute per client.

How do you call it?

GET /v1/funding/naics — product id funding_naics_lookup. Over MCP, call answerpool_get with product_id=funding_naics_lookup.

curl "https://answerpool.io/v1/funding/naics?q=software"

Live call: https://answerpool.io/v1/funding/naics?q=software · JSON sample: /v1/samples/funding_naics_lookup

What does the answer look like?

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

as_of2026-09-03T02:00:00Z
count1
disclaimerReference data from USAspending.gov (US federal public domain); not procurement advice.
refresh_after2026-09-18T00:00:00.000Z

matches

codedescriptionretired
541511Custom Computer Programming Servicesfalse
The same sample as raw JSON
{
 "as_of": "2026-09-03T02:00:00Z",
 "count": 1,
 "matches": [
  {
   "code": "541511",
   "description": "Custom Computer Programming Services",
   "retired": false
  }
 ],
 "disclaimer": "Reference data from USAspending.gov (US federal public domain); not procurement advice.",
 "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.

Method version 0.1.0 · serving cache 7 days · every response carries a result_id you can resolve at /v1/provenance.

When should you use it?

You need a NAICS code for a federal-spending query and have only an industry name or partial code.

What you skip building

When should you not use it?

Non-US industry classification (use the relevant national scheme).

Where else can you find this?