Empire Market is late, new and developing for the peak of dark web market on the hidden network.
It collects essentially all of it's central features from now Alphabay. And calls itself a replacement of it.
The validity of It's onion URL can be verified by using the tor market’s own link-verifier page http://empiremarket-url.com/.
If onion link links are not working, here is the onion mirrors where you can find active onion marketplace mirrors http://empiremarket-url.com/