The API is Work In Progress and may change.
The base URL of the API is https://api.sendmachine.com. All resources support stateless authentication via Basic HTTP Auth. The user and password can be found in the SMTP panel of your account.
The preferred Request content-type is application/json. The Response content-type is application/json and status is 200 unless noted otherwise.
An official API client can be found here: https://github.com/Sendmachine/SendmachineApiClient