Amazon’s palm-scanning payment technology known as Amazon One is prepared to make a significant expansion across the U.S. The retailer announced this morning the payment tech will come to all 500+ Amazon-owned Whole Foods Market stores nationwide by year-end. The biometric payment system works by having the customer hover their palm above a reader device. The device then identifies the individual’s unique palm signature which is then associated with the customer’s payment card on file in order to charge them for their purchases.

Since the technology’s launch in 2020, Amazon One’s service has been established at more than 400 locations across the U.S., the retailer notes, and has reached a milestone of over 3 million uses. These locations have included Amazon’s own retail stores, including its Amazon Go convenience stores, as well as various sports stadiums, entertainment venues and travel retailers like Hudson, CREWS and OHM at several U.S. airports, in addition to Panera Bread through a partnership announced in March 2023.

Stadiums using the tech include Bridgestone Arena, Climate Pledge Arena, Globe Life Field, Lumen Field, T-Mobile Center, T-Mobile Park, NASCAR Raceway and Texas A&M’s Kyle Field, along with entertainment venue Hollywood Casino at Greektown in Detroit and others.