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Hotbit will always add more decimal bitcoin/ethereum if the coins under 1 sat, its a good steep for x-cash we all know hotbit its not a big exchange but atleast we have some good centrazlied exchange.
I have a great deal of experience with hotbit and most of their volume are fake and came from wash trading but still its a addition for x-cash it exposed them to additional investors for the project and more liquidity for the coin.
All trade between the bots of the exchange itself. In reality, there are no more than one percent transactions out of the total volume.