Great job - adding NBT, but even more creating shapeshift.io at all!
I tried to test the NBT conversion, but no matter what pair (and what direction of conversion) I choose, the deposit limit is always 0.0000 NBT.
How does exchanging from or to NBT start if you can’t create any NBT “order”?
Seems to be working now 
I tried to convert something else and that went swimmingly.
I already love shapeshift.io! 