The Campaign Monitor API allows users to interact and "sync" with their Campaign Monitor account via simple web-based methods. Common uses of the API include:
*Automatically sync subscribers between Campaign Monitor and a third party tool.
*Create and send custom email campaigns to segments of subscribers built on the fly.
*Develop useful plugins and integrations like these guys for other popular apps
*Automatically create a client account, set billing and load it with ready-to-send templates.
The API uses RESTful protocol and responses are formatted in XML or JSON.