company registries and aggregators: official API and open-data routes
Symptom: Paid aggregators, CAPTCHA-protected registry search pages
What agents usually want: legal entity names, identifiers, addresses
GLEIF API (global LEI data)
- Documentation: https://www.gleif.org/en/lei-data/gleif-api
- Authentication: No key
- Last check: ok, 2026-10-27
UK Companies House API
- Documentation: https://developer.company-information.service.gov.uk/
- Authentication: Free key required (401 without one)
- Last check: ok, 2026-10-27
Belgian KBO/BCE open data
- Documentation: https://economie.fgov.be/en/themes/enterprises/crossroads-bank-enterprises/services-everyone/cbe-open-data
- Authentication: Bulk download; see page for access conditions
- Last check: docs reachable, 2026-10-27