With the Cocoonmail API, you can easily manage contacts directly from your application or service. For example, creating a new contact is as easy as sending a POST request to https://webhook.cocoonmail.com/webhook/contact/create. 
{
   "email": "<string>",
   "first_name": "<string>", 
   "middle_name":  "<string>", 
   "last_name":  "<string>", 
   "attributes":  "[{}]", 
   "lists":  "[]", 
   "tag":  "[]"
}
We also offer endpoints for finding, updating and deleting contacts (plus some other features like sending transactional email and sending events). Go to our API reference for a full guide.