No, it's not. It is far from being dead.
I have Bittrex and BinanceUS. When I search for IOST on both the results of the search show... "no search found.. " or something similar. If I search for a coin like ADA on that same search it works as normal. My coin are on Bittrex and they show $0.00 and above that my BTC shows it current value. So damn frustrating!
It seems that it's not really on the market of Binance.us. But on Binance.com, it is listed with a lot of buy and sell orders. That really depends on the country where you trade and if it's not on Binance.us. Look elsewhere for another exchange that supports your country and has it listed.