Overview
Castle is an API platform for detecting account takeover, bots, multi-accounting and suspicious transactions in real time. It was founded in 2015 and is based in San Francisco.
Products The listed products are device and network fingerprinting, bot and credential-stuffing defence, multi-accounting detection and an inline policy engine. The description stresses fast SDK integration, which makes it a fit for product and engineering teams that do not have a dedicated fraud department.
Customers and coverage Target customers are fintech, crypto, marketplaces, SaaS and gaming. Geography is described as global.
Commercial model Castle publishes a SaaS tariff based on event volume. This ties cost to traffic rather than to seats, so the expected number of login and transaction events is the first number to estimate when comparing plans.
Fit The product covers account-level abuse rather than card-level scoring, so payment companies typically consider it alongside transaction fraud tools.
What they do
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