NEW YORK (CNNMoney) -- American Express is diving into the e-wallet space with Serve, a service that lets customers transfer money to others online and make payments with their mobile phones. In its announcement Monday, AmEx said Serve is aimed at customers who use cash, checks and debit cards, rather than the company's traditional credit card users. Serve accounts will be available immediately in the U.S. and are expected to launch internationally over the coming year. Mobile payments are a new direction for AmEx as it tries to get a toehold in a rapidly growing market. Research firm Generator Research...
