The Embedly Objective-C SDK by Embedly allows API interaction. Its resources include embed and extraction of APIs. An example demonstrates how to embed images to a project that a user can re-size and crop.
Uberblic is another instance of what may become a trend in the world with thousands of APIs: the Meta-API. The Uberblic Doppleganger API is currently in beta, but it is quite ambitious in that it looks to position itself as a API cross-reference or mutli-plexer. Submit an ID from one API to the Doppleganger, get 4-5 IDs for matching content from other APIs.