MoPub is a hosted ad serving solution built specifically for mobile publishers
MoPub’s consolidated mobile ad serving platform gives app publishers the ultimate in monetization flexibility. You can manage your whole advertising stack: from 1st party direct-sold ads and cross-promotions to ad network management. You are also automatically connected to the world’s largest and most liquid RTB exchange for mobile, MoPub Marketplace.
MoPub features streamlined campaign management, reporting, metric tracking and native multi-platform support. Publishers/Developers are in control and can easily sell ads directly to brand and performance advertisers along with being able to dynamically optimize mobile inventory with ad networks.
More Details: Mopub website