I don't find compare OPEN/ETH, Most pair USDT. you can't sell it immediately to ETH. In this case, you have to exchange to USDT first then USDT to ETH. Bilaxy exchange has a big volume, you can easily compare it fast without waiting for a long time, however, you should  proof KYC. at least you have to go to uniswap but, you must prepare a higher fee.