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Developers portal

Bank Millennium

Developers portal

Providing a production API

For certified third Party Providers (TPP), production APIs are available at:


Open banking

The API (based on the PolishAPI 2.1.1 standard) provides three types of services: AIS, PIS and CAF. These services allow you to access account information, order transfers and check the availability of funds on your account. The API uses the OAuth2 standard and tokens. Communication with the API takes place via Mutual TLS connection based on qualified certificates in accordance with ETSI TS 119 495 standard. Only certificates issued by a qualified trust service provider in accordance with Regulation (EU) No 910/2014 are allowed.


The API is designed for corporate Clients. It uses the SOAP protocol to send messages. Their content is based on the ISO 20022 standard. Communication with the API takes place via a Mutual TLS connection. The API enables ordering transfers and checking transaction history.