The firm's business-focused payments arm, Square, told CNBC that it opened registrations for its Square Card product in Britain late Wednesday, marking the first time Block has expanded its business card offering outside North America, where it first launched in 2019.

Currently available in the U.S. and Canada, Square Card is a free business spending card that reduces the time between merchants making a sale and having funds available to spend. It competes with offerings from the likes of American Express and Citigroup.