There are two types of exchanges on the crypto market: centralized and decentralized. The former operate on almost the same principles as exchange platforms on other markets. The only striking difference is that there are no brokers on centralized crypto exchanges (CEX). Decentralized exchanges (DEX) have no analogues on other markets. They are platforms where a buyer and seller meet, without any identification of participants. The over-the-counter crypto market is a structure that, perhaps, no specialist can describe today. The thing is that almost any resource has the ability to perform at least one operation (generation, purchase and sale, exchange) with cryptocurrencies. For example, crypto wallets and the ability to buy crypto assets for fiat currency have appeared even in electronic payment systems (EPS).