We're they recommended by the person you were trading with?
A quick search shows they've been running a scam project for many years now, and the person who suggested using that website most likely is culpable as well.

It depends on what you sent; if it's crypto currency, independently recovering the funds isn't possible, but if the owners are discovered by law enforcement agencies, then there might be a slight possibility.


This is not reported to be a case of phishing, but you can report the website here - https://safebrowsing.google.com/safebrowsing/report_phish/?hl=en
There's no guarantee it would be brought down, but it's worth the few seconds.