Post-Only order flags are used to ensure that limit orders are not matched immediately with existing orders in the book. The Post-Only flag is available for limit orders, take profit, and stop limit orders.
Select 'Post-Only' from the Order Flags dropdown list in the order panel to receive a maker rebate:
A limit order with the Post-Only flag will be cancelled if it can be matched with existing orders in the order book.
For example, if the best ask in the order book is $9,350 and you submit a Post-Only limit order to buy at $9,355, the order will be cancelled. However, if there is a Post-Only limit order to buy at $9,340 and the best ask is at $9,350, the order is placed onto the book like a standard limit order.
The Post-Only order flag can also be used with stop limit or take limit orders to ensure that a trader does not pay trading fees (since the maker fee is 0.00%) once the order is executed.