Looking forward to the response the author of this topic. I really wonder where did his $ 850 and whether he could return them.
He doesn't seems replying for his exchange of GDAX but as I research this coin is scam and some discussions are about that.
If he needs to exchange the bitcoins for any payment option you could check it on exchange section on this board.
Nope selling the tokens back will not be possible and market growth may decide if that listed on any reputed exchanges.