First reported last week as an undisclosed round, CafeX has revealed it closed a $21m series B round.

CafeX Communications, a US-based developer of mobile and web advertising technology, has received a $21m series B round from backers including Intel Capital, the corporate venturing unit of semiconductor company Intel.

An unnamed subsidiary of insurance provider USAA, Illuminate Ventures and angel investors joined the round.

Founded in 2013, CafeX previously secured $10.5m from investors including Illuminate Ventures, according to regulatory filings.

CafeX has developed a platform for real-time communication that can be run either in the cloud or a…