What am I charged?

No separate trading fee — you pay the price to fill your order.

OC Market does not add a separate trading fee. You pay the price it takes to fill your order on the live order book.

That price can be a little above the price on the button, because the button shows the best price for a small order and a bigger order may need to go one or two cents further into the book. The panel always shows your average price before you confirm.