You can retrieve the list of users on your account by doing the following:
HTTP GET to https://www.easy-insight.com/app/api/users.json
The result will be a JSON array with an entry for each user:
[ { "email": "email@email.com", "first_name": "Joe", "last_name": "Smith", "username", "email@email.com" }, { "email": "email2@email.com", "first_name": "Lisa", "last_name": "Smith", "username", "email2@email.com" } ]