Methods, systems, and apparatus, for a payment card reader comprising: a frame, where the frame includes a top surface, a bottom surface, a first side surface, and a second side surface, a second side surface of the side surfaces on an opposite side of the frame from the first side surface, the first side surface including a groove configured to receive a swipe of a magnetic stripe card, the second side surface including a slot configured to receive insertion of a chip card; a magnetic stripe reader interface; a chip card reader interface; circuitry configured to direct signals from the magnetic stripe reader interface and the chip card reader interface to a microcontroller in the card reader; and circuitry configured to communicate wirelessly between the card reader and a computing device.