In a flash, this is what the Coredination API is.
API = App - UI
The Coredination applications (web and mobile) use the API themselves. So just about anything you can do with our applications is available for you to do in your own application.
Free of Charge
Anyone with a Coredination account is welcome to use the API. Just obtain an API key and get going. We do limit request rates etc to protect our servers and your data but as longs as you're within normal usage, feel free to hack away.
The API follows (somewhat loosely) the architectural principles of REST. You can access it using curl, your favorite REST client, or even your web browser.
Almost all resources are transferred using JSON as the media type.