About this API
CEIDG (Central Registration and Information on Business) is the registry of all sole proprietorships in Poland. The "Data Warehouse" API v2 exposes this data programmatically — business status, address, PKD codes, dates of starting/suspending/ending activity.
Frequently asked questions
Do I need an API key?
Yes. You need to register at dane.biznes.gov.pl — a JWT key arrives by email within a few minutes, registration is free.
What data does this API return?
Business status (active/suspended/deregistered), address, PKD codes, tax form, and change history — from a tax ID (NIP) or entry number.
Can this API be called directly from a browser?
Even if the API allowed it, a JWT key shouldn't end up in frontend code visible to every visitor — such requests should be made from your own backend.
Who runs this API?
Poland's Ministry of Development and Technology, via the Biznes.gov.pl portal. Full documentation is available at dane.biznes.gov.pl.