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Castle

Stop bots and account abuse at scale

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Castle is a fraud and abuse prevention platform that combines device, IP, email, and behavioral intelligence to detect bots, account takeover, fake accounts, and other abusive activity. It provides a unified stack of data, tools, and APIs, replacing the need for multiple disconnected fraud and security tools.

The platform includes IP intelligence for identifying proxies, VPNs, Tor, and datacenter traffic; device fingerprinting; bot detection; AI scoring for account takeover and abusive behavior; behavioral analysis with custom aggregations and rate limiters; and email intelligence for detecting disposable domains and enumeration patterns. It offers case and state management for blocklists, allowlists, and trusted devices, inline blocking, Slack alerts, and webhooks. Analytics features include pattern exploration, network analysis, session monitoring, and rule backtesting. A single API supports device intelligence, bot detection, ATO and abuse scoring, IP and proxy analysis, email intelligence, custom metrics, custom alerts, rule evaluation, and state management.

Castle is designed for teams needing to detect and block fraud and abuse at scale, including fake accounts, account takeovers, multi-accounting, content abuse, SMS pumping, account sharing, transaction abuse, and API abuse. The platform offers a free tier and free API quota, with usage-based pricing for the IP Intelligence API.

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