About this API
The VAT Register, commonly known as the "Biała Lista" (White List), is a registry of VAT taxpayers maintained by Poland's Ministry of Finance. The API lets you check, by tax ID (NIP), whether a business is an active VAT taxpayer and whether a given bank account is on the registered list — the basis for due-diligence checks on transfers above 15,000 PLN.
Frequently asked questions
Do I need an API key?
No. The VAT Register is fully public — no registration or key needed, requests go directly to wl-api.mf.gov.pl.
What data does this API return?
The business's VAT status, its name, national statistical number (REGON), address, court registry number (KRS, if applicable), and the list of registered bank accounts — all from just a tax ID (NIP) and a date.
Can this API be called directly from a browser?
Yes — the API returns correct CORS headers, so it works straight from frontend code without a backend proxy (hence the live "Try it" button above).
Who runs this API?
Poland's Ministry of Finance. Full technical documentation is available at wl-api.mf.gov.pl.