What is Fill or Kill (FOK)?
From a crypto perspective, FOK (Fill or Kill) is a form of limit order to buy or sell cryptocurrency that must be realized in its entirety immediately and at a pre-specified price. The order will be canceled or terminated if the price is not matched or the full quantity cannot be bought at the order price. The FOK orders cannot be partially filled. This type of order is offered on some exchanges, and it is similar to the AON order, with the difference being that the “All or Nothing” order doesn’t have to be executed immediately.