Ladies and Gentlemen, due to numerous telephone calls, we would like to inform you that today, July 23, 2024 (Tuesday), from approximately 1:00 p.m. there is a system failure on the part of the Ministry of Finance. Currently, neither the browser interface (GUI) nor the programming interface (API) work properly:
Unfortunately, there is nothing we can do except be patient. As soon as the List of VAT Payers starts returning correct answers, our API will also send them correctly to your systems.
We also encourage you to follow the official website of the Ministry of Finance where technical announcements are published: https://www.podatki.gov.pl/komunikaty-techniczne/
nip24.pl team
English (UK) 
Polski