The hidden order flag can be specified with any limit order (limit, stop limit, take limit) and ensures the order is not visible on the book. Hidden orders always pay the taker fee.
To submit a hidden order, select 'Hidden' from the Order Flag dropdown menu:
Hidden orders will not appear on the order book so traders can use this order flag to prevent large orders from impacting the market.
Once the limit price is reached, the hidden order is executed.