PubMatic offers a mobile SDK for developers to access and integrate the functionality with other applications and devices. PubMatic is a service for web publishers that automates and optimizes ad serving decisions. PubMatic simplifies the online publishing business by determining in real-time which ad network can best monetize each ad impression for a publisher.
The Moodstocks API provides image recognition services that developers can integrate into their mobile and web applications. The image recognition API allows developers to add reference images and define them--a process that in turn can be used when identifying objects in images.
There is something to be said for simplicity, especially when it comes to applications that leverage web APIs for mobile devices. Enter Sparrow, an application for the iPhone, that serves as a good example of how a few web APIs can be elegantly implemented for use on a mobile device.