Big banks have been snapping up fintech firms to better serve customers who have become accustomed to digital products. : Capital One acquired a four-year old online-shopping startup in its latest effort to offer tech services that engender loyalty to the bank's credit cards. The bank purchased Wikibuy on Nov. 17 for an undisclosed amount, according to executives from Capital One and the Austin, Texas-based startup. Two million members use Wikibuy to automatically find low prices and coupon codes and earn loyalty points.