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Open Advanced in the order form to change how an order behaves. Each option is independent, and several can be combined.

Post only

A post-only limit order always rests in the book as a maker order. If it would fill immediately against an existing order, it’s cancelled instead. Use it to make sure you never cross the spread by mistake, for example with a mistyped price.

Reduce only

A reduce-only order can shrink or close a position, but it can’t open one, increase one, or flip a long into a short. Use it on any order meant as an exit, such as a limit take-profit. If you close the position some other way first, the reduce-only order has nothing to reduce and can’t open a new position.
Stop losses and take profits use reduce only automatically. See Stop Loss and Take Profit.

Hidden

A hidden order works like a normal order but doesn’t appear in the order book other traders see.

Iceberg

An iceberg order shows only a slice of its full size in the book. When a slice fills, the next one appears, until the whole order is done. Set the size of each slice in Visible per slice. Use it to work a large order without showing its full size.

OCO (one cancels the other)

OCO links two orders. Give both orders the same OCO group: if one fills, the other is cancelled. The classic use is a take-profit above the price and a stop below it on the same position: whichever is reached first fills, and the other one is cancelled.

Where to see them

Every order’s options are listed in its details on the Order History page, and trigger orders on the Triggers page.