More than 3,500 stores offer Cash Back. Join for free to start saving today. Sign up for free and start saving today. Rakuten has helped shape the way people shop online since they were founded in 1997, offering Cash Back, deals, and shopping rewards on the world’s largest selection of products and services. Over the past year,17M members in the U.S. have earned over $3.7B in Cash Back at their favorite stores. Does it sound too good to be true? Here’s how it works: Stores pay them a commission for sending you their way. You get cash back on that commission. The system works for everyone!