Empire Market is big and most notorious Deep Net Marketplace at the time. Being this big has it's consequences regular Ddos attack causes primary Empire Market link to be down, and alternative mirrors as well. That means to empire market had to design more and more URLs and tor mirrors and links. And the thing is that there are not to many ways costumers can discover a right Empire Marketplace link.
So that's why Empire Marketplace decided to create a special website where their users can at any time discover legit URLs and onion mirrors, for quick access to Empire Market. Here it is http://empiremarketurl.online/ make sure you using it every time you you wish to login to darknet market empire market.

You are able to enter at several Deep Web markets with the only help of URLs, it means next : inpending buyers and merchants are not allowed to join the market until they will gtab an alternative URL from an previously enlisted vendor or buyer.
You can find those at https://darkwebonion.com/, it has updated urls to suggested Dark Web marketplaces. You may follow these alternative URL to register on the sites.
Whenever there are some issues with an access (links don't work), you ought to hang around and check for Deep Web markets URLs. Persist with it, for the reason that some of the markets shut down and open registrations periodically, due to server load.