JPMorgan Chase has agreed to buy payments start-up WePay, in its first major acquisition of a financial technology (fintech) firm. The investment bank said Tuesday it would provide its 4 million small businesses clients with WePay's payments technology. "With WePay, Chase is taking the work out of payments for both our business clients and the software providers who serve them," Matt Kane, CEO of Chase Merchant Services, said in a statement Tuesday. "We are powering payments for growth, so...