Rudex debuts itself as a decentralised exchange which seemingly is able or has some Crosschain capabilities as pairs even involving currencies like Bitcoin can be found on this exchange (in their unwrapped version) I do actually have some views of this Exchange as not being decentralised as it portrays to be. To begin use this exchange, one needs to sign up and deposit can be catered for by the users, there doesn't seems to be any provision for where one can see the private keys to the wallets they have on this exchange the way Idex does. Am also suspicious about the volume it displays as most of the pairs I have seen on this exchange are at 0 liquidity. There is though an active social group on Telegram which speaks Russian and makes it hard for me to interact and ask my questions about the exchange. I have decided not to use this exchange and I will advice you do the same