Castle

Castle provides a comprehensive suite of APIs and SDKs designed to help businesses prevent account takeovers, fake account registrations, and other malicious activities. The platform uses real-time risk scoring based on device fingerprinting, behavioral analytics, and a global intelligence network to distinguish between legitimate users and fraudsters without adding friction to the user experience. Founded in 2015 and a graduate of the Y Combinator (W16) accelerator program, Castle's mission is to secure every online identity against emerging threats.