According to Apple CEO Tim Cook, Apple Pay is now growing at a faster rate than PayPal, the web’s most popular payment service. Apple Pay is the company’s mobile payment service that allows users to make purchases using their iPhones.

During a call with investors, Cook asserted that Apple Pay is currently servicing close to one billion transactions every month—an increase of more than 100% from a year ago. Business Insider reports: “In the past three months, [Apple Pay] has launched in 17 new countries, which means its reach now extends to 47 markets in total, including the entire European Union.”

Cook stated that, over the last quarter, Apple Pay bested PayPal in two critical areas: volume of transactions per month and the number of new users that have signed on to the service.

“Cook was likely referencing numbers reported earlier this month in PayPal’s second-quarter earnings,” Business Insider reports. “PayPal said that it added nine million new members during the second quarter. It also said that engagement per active account increased by 9% to 39 times a year.”

While Cook’s spokespeople did not respond to a request for comment, Business Insider estimates that a minimum of nine million new users were picked up by Apple Pay during the last quarter.

In January Apple announced that, with the addition of Target, Taco Bell, Hy-Vee supermarkets in the Midwest, Speedway convenience stores and Jack in the Box, “74 of the top 100 merchants in the US and 65 percent of all retail locations across the country will support Apple Pay.”

Commenting on the expansion, Apple’s vice president of Internet Services, Jennifer Baily, stated:

“Whether customers are buying everyday household items, groceries, snacks for a road trip or grabbing a quick meal, Apple Pay is the easiest way to pay in stores, while also being secure and faster than using a credit or debit card at the register. We’re thrilled even more customers will be able to pay at their favorite stores and restaurants using the Apple devices that are always with them.”