Organised in association with record company Bella Union, the stage will host independent label acts including Emmy the Great, Adem, Semifinalists and Duke Spirit.
New additions to the main stages include David Jordan, The Cool Kids, Deadmau5, Neon Neon and Ryan Shaw.
O2 Wireless takes place on July 3-6 at London's Hyde Park. The bash is headlined by Jay-Z, Fatboy Slim, Morrissey and Counting Crows.
Tickets are still available for all four days.