How many kinds of accounts do they offer?

https://www.mexexchange.com/     

MEX Exchange is owned and operated by MEX Australia Pty Ltd, a company authorized and regulated by the Australian Securities & Investments Commission (ASIC) under licence number: 416279. 

As for the question you asked, we would recommend that you check the "Account Types" section on the broker's official website or ask the official customer service directly for a more accurate answer. Fore more details about this broker you can check our full MEX Exchange review.