KnowFirm

The KYB & firmographic data API.

Verify, enrich, and sanctions-screen any U.S. business by EIN, name, LEI, or CIK in one call — cross-source resolved across authoritative public records, with a confidence score and per-field provenance.

View the API Live status

# resolve a business in one call
curl -H "X-API-Key: $KNOWFIRM_KEY" \
"https://api.knowfirm.com/v1/business?name=bank%20of%20america"

GET /v1/business

Resolve a business by EIN, name, LEI, or CIK → identifiers, sources, confidence, firmographics, provenance.

GET /v1/business/search

Search businesses by name → ranked candidate entities.

GET /v1/business/similar

Similar companies for a resolved entity (industry + size + state).

POST /v1/screening

Sanctions / denied-party screening vs the U.S. Consolidated Screening List.

POST /v1/enrich

Batch resolve up to 100 businesses in one request.

Built on 2.77M EIN-keyed businesses, 3.35M GLEIF LEIs, SEC, IRS, FDIC, and the U.S. Consolidated Screening List — resolved into one entity with provenance. KYB / firmographic data only — not a consumer report (FCRA); not for credit, employment, insurance, or housing decisions.