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February 8, 2019

Castle raises $9.2 million for AI that protects consumer apps from account takeovers

Castle, a San Francisco-based startup that wants to help businesses keep their customers’ online accounts safe from fraud, has raised $9.2 million in a series A round of funding from Index Ventures, with participation from Y Combinator, First Round Capital, F-Prime Capital Partners, and a host of individual angel investors.

Founded in 2015, Castle works with web and app developers looking to offer greater security inside their consumer-facing apps. Castle’s technology helps prevent all manner of account takeover (ATO) efforts, whether through manual attempts or automated methods, including credential stuffing.

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