OnStar announces 'closed' API, developers welcome to apply

Tonight OnStar's pulled back the curtain just a tad, revealing it'll soon allow pre-approved third parties to build "apps" atop its platform. While the closed API won't launch until later, at CES the telematics service announced its first partner: RelayRides -- a peer-to-peer car sharing service that enables OnStar owners to rent their cars. Access to the API allows RelayRides to remotely unlock reserved cars, all from a smartphone. It'll be one of many to go live in 2012, so devs with a knack for the next big thing ought to peep the PR after the break.