The Spreadshirt API provides a programmable REST interface that gives you access to most of Spreadshirt's platform functionality. To understand what the API can do for you:

To get started using the APIĀ 

Please note that the Spreadshirt API is right now available as an alpha version. That means that the Spreadshirt API, i.e. offered URLs, representations and status codes, is not stable yet and we reserve the right to conduct changes on it.