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Castle is a YC-backed Series A startup helping companies like Canva, Atlassian, and Rockstar Games fight fraud and abuse. We build modern, AI-powered bot detection and abuse prevention technology, focusing on real-time protection and behavioral intelligence. Our platform lets businesses block bad bots, account takeovers, transaction fraud, and spam without relying on CAPTCHAs, leveraging user identity, reputation, and behavior analysis through features like advanced device fingerprinting, AI scoring, customizable rules engines, and comprehensive analytics.