It's not helping that OP links to a different domain:
I know both are owned by eXch, but different domains make it even easier for phishing. I too keep forgetting which one of the similar domain extensions is legit.
exch.pw is a reserve domain which automatically redirects to exch.cx, it should remove any doubt.
I'm sure this topic has been talked about before. But, with so many posts, it never hurts to remember.
What is the minimum conversion value for the various coins?
You can leave the “Amount” fields blank during order creation, then the system will show the updated minimum deposit possible (also clicking on "Calculate" will give you this information). The minimum and maximum deposits are also always displayed on the order page, below the deposit address.
Also, the plan is to move everything to exch.net, which is in their possession. Although a lot of time has passed since then, I have not seen a later update on the status of this move.
Last update on the matter (still relevant):
I keep asking myself why they don't start using a more traditional domain in order to avoid these types of errors on the user's side.
We will either (a) have exch.net as our corporate site that will point to current platform domains (exch.cx and Tor address) or (b) completely move the platform to exch.net. We are still in a process of making a decision on that with no ETA.