The number one way hackers are stealing your Bitcoins is by showing what looks like an invite link but the address is really slightly changed leading you a phishing website. These sites will look like Agora but when you deposit anything it just steals your BTC. This is a serious issue and should not be taken lightly.
ALWAYS make sure the address starts with - http://agorahooawayyfoe.onion
As shown on the Agora Reddit page - http://www.reddit.com/r/AgMarketplace
Followed by - /register/(Code) Like this Reddit verified invite address = http://agorahooawayyfoe.onion/register/Yp38jeoAcz
Anyways, Have fun and be safe!