Large-scale, real-time, machine-learning-based ecommerce fraud protection is the business of Sift Science. Its technology lets merchants create rules for automated decisions aimed at reducing challenges to authorizations of card payments that result in lost sales. Sift Science says its platform lowers the false positive rate at ecommerce merchants to about 20%, significantly reducing manual reviews. These merchants also receive lower chargeback rates and catch fake account, account takeover, and referral fraud. The company started fighting ecommerce fraud four years ago. Today it collects d...