From MatrixStore v4, we provide a REST API that can be used to manage your MatrixStore including users and vaults.
MatrixStore v4.2: Includes Space Management and Hybrid Vaults, download here
MatrixStore v4.1: Includes Application Capabilities, download here
MatrixStore v4.0: Initial version, download here
In addition, we have setup a guide using cURL providing some basic examples on how to interact with the MatrixStore Management REST API, which can be downloaded from here