AdMob (Google) operates: AdMob
" A single platform to grow your app business Monetize your apps with ads from over a million Google advertisers worldwide. Get access to programmatic demand and best-in class mediation tools to maximize revenues effortlessly. Promote your apps to hundreds of millions of smartphone and tablet app users across the AdMob network. Cross-promote within your own apps for free with house ads. Analyze your apps with the power of Google Analytics now available through the AdMob interface. See powerful data, understand your users, take immediate action."