Self-service machines have been in operation at the regional branches of Narodowy Bank Polski since January 2021. The machines enable customers to deposit large numbers of coins quickly and conveniently, and subsequently withdraw the equivalent amounts in selected denominations in NBP cash desks, or make a transfer to a bank account via the Polish system of instant payments BLIK. Queues of customers waiting to use the devices and 350 million coins obtained in the first seven quarters of the operation of the machines are evidence of an enormous interest of the public in the service. During the presentation, you will learn how the project was launched and how the service is provided. The benefits of the service will be presented, including savings made in the costs of purchasing coins. The challenges and problems which had to be overcome during the project implementation, as well as plans of further development of the service will also be discussed.