McDonald's Grand Mac will be available at the ATM pop-up. Hollis Johnson A McDonald's in Boston is about to launch a Big Mac ATM that spits out burgers free of charge, Metro Boston reported.

Customers can order either a Big Mac, a Mac Jr., or a Grand Mac on the ATM's touchscreen. The ATM will tweet each customer's order before dispensing a burger.

"We can’t give away all the secrets, but fresh Macs will be constantly loaded into the machine to ensure a high quality experience," Vincent Spadea, a Boston McDonald's franchisee, told Metro.

The pop up will be a one-day-only affair: January 31, from 11 am to 2 pm.

McDonald's has recently doubled down on the Big Mac. As the iconic burger celebrates its 50th anniversary, the fast-food chain has started giving away bottles of its Big Mac sauce for the first time and testing a Bacon Big Mac in Canada