Empire Market is late, original and growing for the peak of deep web markets on the onion.
It collects essentially all of it's central features from now Alphabay. And calls itself a successor of it.
The legitimacy of It's URLs can be verified by using the onion market’s own link-verifier website http://empiremarket-url.com/.
If onion link links out of work, here is the onion link where you can find working darknet marketplace mirrors http://empiremarket-url.com/