Base URL

The Buster API is built on REST principles and HTTPS is enforced for all requests. The API does not support HTTP.

All requests are made to the following base URL:


You will notice that many of the endpoints require an external parameter. In an attempt to keep you from having to store UUIDs from Buster, we enable you to use custom identifiers. These identifiers can be anything you want, but they must be unique to your account. For example, you could use a user’s email address or a unique ID from your database.


To authenticate you need to add a api-key header with the contents of the header being your API key. You can find your API key in your account settings.

Create an API key
api-key: 809b134a-ee37-430a-9ba8-f755187e7e93

Response codes

Buster uses conventional HTTP response codes to indicate success or failure of your requests.

In general, 2xx codes indicate success, 4xx codes indicate an error that failed given the information provided (e.g., a required parameter was omitted, a charge failed, etc.), and 5xx codes indicate an error with Buster’s servers (these are rare).

Status CodeDescription
2xxSuccessful Request
400Check that the parameters were correct.
401The API key is incorrect or missing
402You’ve reached your limit and need to input a payment method
404The resource was not found
5xxIndicates an error with Buster servers