The SK Telecom-backed app advertising and monetisation service provider is set to be bought by Zynga following $21m of venture funding.

Video game developer Zynga agreed on Wednesday to buy Chartboost, the US-based developer of a mobile app advertising and monetisation platform, for about $250m, enabling telecommunications firm SK Telecom to exit.

Founded in 2011, Chartboost provides a programmatic advertising and monetisation platform for mobile-based applications that utilises machine learning technology and data science techniques.

The company claims the platform has more than 700 million monthly active users and generates in excess of 90 billion monthly advertising auctions.

Chartboost CEO Rich…