I might be missing something but with current price of BTC of around 380 and you asking on LBC "Price: 455.52 USD / BTC" . You send to someone at 21 percent off... but they pay a 17 percent more the current bitcoin price. So would it not be closer to like 4 percent off currently?
And I might be misunderstanding.
Thanks for your reply! Basically the discount is calculated on Bitfinex rate! As per your example stated above, LBC price was showing $455.52 USD/BTC. It means that i am buying BTC @455.32 USD/BTC whereas the current Bitfinex rate would be 21% less than $455.32.
So, you are selling your BTC, 21% above Bitfinex rate which ultimately results in 21% discount on your purchase!
Hope i have cleared your doubt!