Yes, Coinhub is an exchange; and it's a small one. It looks to be working fine, but I don't know about the security and customer support.
Any reason you're interested in Coinhub? As they only currently trade very very few coins(BTC, ETH, LTC, DASH, DRG, and BBI). I'd personally go with Binance instead[1].
[1] https://binance.com/
Thank you. I'm also trading in Binance but an ICO that I joined listed the token in coinhub which I never heard of. I check in reddit but no feedback there, many posted question but no replies and then here, I only saw a post but no feedback too.
I think you are trying to trade HBZ coin in Coinhub, today Helbiz Coin ( HBZ ) listed in Coinhub. I have never used Coinhub, I prefer to trade in Binance.