The messaging platform Line launched a new exchange a couple months back called Bitbox.
They seem to be real fans of AION as they had a promotion back then giving away $200k worth of Aion.
Their latest promotion is giving a 5% bonus on AION deposited to their exchange for the Swap event. (limited to 1000 Aion bonus or 20 000 Aion deposited)
See more details here https://www.bitbox.me/notice/20093665
Of course do your own research, from my experience having participated in prior promotions it is legit.
Not paid, no refferal, just letting my Aion buddies know