Update regarding my experience on BaseFEX:
I have been trading there for a week. With $700 BTC deposit, I ended up $1600 BTC in my balance before my withdrawal yesterday. I trade exclusively on their BTC pairs.
The liquidity is way better than I thought. I can have my orders fulfilled or taken most of the time. I also began to develop some familiarity with their interface that I had criticized about. Their API is neat and comprehensive, pretty easy to integrate with my tools.
I trade a lot during the period of volatility. Some exchanges of even longer history often have the server overwhelmed(such as BitMEX) or error out(such as Deribit as I heard) during these times. BaseFEX is an exception, as I hoped, not much difference when the volume is up. I was told by the support that their backend is built and maintained by some former Huobi and OKEX engineers so I guess it's worth the trading fees I pay.
You're in the US, right? I assume you are trading through VPN? Sounds like there were no issues with getting your IP address flagged by BaseFEX, or server lag?
Let us know if you run into any concerns/problems. I'm all about having more options as far as trading platforms. Their fees aren't
quite as competitive as Bitmex, but if the UI and order matching engine is decent then I'm interested. Bitmex server performance under load is disappointing, and now that the US authorities are digging into them, they are getting less attractive.