Here is the OFFICIAL list of Agora market place registration links from the Agora sub Reddit -
"How do I register a new Agora account?
Agora is an invitation-only dark market, and you'll need an Agora invite link or "referral link" (see list below) to register a new market account. Luckily, each link can be used an unlimited number of times, and you can find a list of them below. Start at the top, and work downwards. If one of the links doesn't work, use the next one on the list. If you find that none of the links work, it means that the staff are working behind the scenes and have temporarily closed new user registrations. If this happens, they will re-open soon enough, usually after a few hours, maybe a day tops. Simply try again later."