Compared to the traditional market the number of cryptocurrency exchanges is much higher than usual. However, not all of them offer services that are worthy of creating a separate site. The emergence of decentralized systems (such as Idex and Oasis) threw a challenge to the exchange community. They do not require any documents, and the registration process takes only a few minutes. Such areas were a natural development of a decentralized movement.
With the growth of liquidity of these exchanges to the attention of the regulators towards them was getting closer. With trading volumes that exceed $ 1 billion, decentralized exchange turned into a full-fledged market participants. Some sites chose to become centralized, to follow the dictates of the authorities and to protect assets held in accounts.