Abstract: A device for conducting monetary transactions with smart cards such as blank cards comprises a housing (120), a coupler (121) for smart cards, a slot (121a) located at the coupler for partial insertion of a smart card, a keypad (122) for the input of at least one confidential code associated with the card inserted into the coupler, and a process for validating the transaction. The slot is adjacent to an edge of the keypad, and the coupler and the slot are positioned so that a portion of the card remaining outside of the housing after partial insertion extends at least partially above the keypad, forming a screen during input of the code to protect confidentiality.