Quota on Client-less users not available but can API?

Reference with SOP-HOS xg230 not offer Quota on Client-less users, but SOP-HOS also officially offer API functionally in where take help of programmer and separately build application.

Our concern that what the risk on that if we build app.

  1. What damage of  OS/Firmware  if use API?
  2. Is API causes of device slow performance?

Note: We're simply use GET/SET function for limited information and all conditional quires calculate on third party application.