The aim of the study is to examine the efficient market hypothesis by using the capital market efficiency of Crypto currencies. The efficient market hypothesis is generally used by reducing it to the weak form since the semi-strong form or strong form is difficult to test. In order to determine market efficiency, EI and CMEE efficiency indices are used. According to the EI efficiency index, Bitcoin, Ethereum and Bitcoin cash of Crypto currencies are close to strong form efficiency while Riple Crypto currency is close to weak form. However, CMEE efficiency index, Bitcoin, Ethereum, Bitcoin cash and Riple have semi-strong form.