Ethfinex is a virtual asset trading platform for digital currency that offers margin trading,spot trading and more. The exchange is only useful for trading Ethereum and ERC tokens which I perceive is the reason the exchange is named Ethfinex. The exchange has been closed down ever since October 2019 ,the exchange's website hasn't been deleted but whenthe website is accessed it takes one to Bitfinex exchange's web page, this shows that Ethfinex has been replaced with Bitfinex exchange. While it was still operatiing as an exchange they charge a 0.2% takers fee and 0.1% makers fee the same fee is charge on Bitfinex making a suitable alternative and even far better since Bitfinex supports other non Ethereum blockchain coins.