The Google Cloud Go SDK by Google Cloud Platform allows developers to integrate the Google Cloud APIs into their Go applications. This SDK is under development and may occasionally make backwards-incompatible changes.
Amazon just dropped prices on its popular Amazon S3 API, which provides storage to much of the web. The service will pass 1 trillion objects stored this year. With that volume comes opportunities to lower the costs, as we've seen from other companies whose entire product line includes APIs.
Popular cloud-stored notes app Evernote recently announced its first contest. Developers can use the Evernote API to build apps that help users remember and track anything using photos and text. The contest is serious, with big prizes: $50,000 to the winner, and $50,000 more in prizes up for grabs.