Great news my fellas! The recent Jetpack update brings in a great feature that many developers have waited for. From now on you can use the WordPress.com REST API on your self-hosted site. This means that if you have an app running off WordPress, you can offer REST API support by simply installing Jetpack. You can also build sophisticated apps that rely on the REST API, so you can
It’s also worth mentioning that self-hosted sites had XML-RPC API support for a while now, and is pretty useful by its own. That said, the WordPress.com API is far more robust and well-documented.