Yes, we do! We just suggest you go on this link (this link requires you to be logged in and will open in a new tab or window) where you'll see all the goodness we have for your developers! Our API is simple but robust at the same time.
Pro and Advanced have access to Standard API which offers limited API requests. Enterprise has access to our Premium API which allows you to integrate with the highly powerful application. To get a better view of Standard vs Premium API, please visit this slide presentation available here.