Anti-fraud startup Shape Security has tipped over the $1 billion valuation mark following its latest Series F round of $51 million.

The Mountain View, Calif.-based company announced the fundraise Thursday, bringing the total amount of outside investment to $173 million since the company debuted in 2011.

C5 Capital led the round along with several other new and returning investors, including Kleiner Perkins, HPE Growth, and Norwest Ventures Partners.

Shape Security protects companies against automated and imitation attacks, which often employ bots to break into networks using stolen or reused credentials. Shape uses artificial intelligence to discern bots from ordinary users by comparing known information such as a user’s location, and collected data like mouse movements to shut down attempted automated logins in real-time.

The company said it now protects against two billion fraudulent logins daily.

C5 managing partner André Pienaar said he believes Shape will become the “definitive” anti-fraud platform for the world’s largest companies.

“While we while we expect a strong financial return, we also believe that we can bring Shape’s platform into many of the leading companies in Europe who look to us for strategic ideas that benefit the entire value-chain where B2C applications are used,” Pienaar told TechCrunch.

Shape’s chief executive Derek Smith said the $51 million injection will go towards the company’s international expansion and product development — particularly the capabilities of its AI system.

He added that Shape was preparing for an IPO.