Post Only

Post Only can only be used on a limit order.  

This condition specifies that if your order can be matched with anything on entry for an immediate execution, you want the order cancelled.

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The risk of creating an order for "Post Only" is that you aren’t guaranteed an execution.  The market could move and you might never get a fill.

Who would want to use this condition?  In an order matching marketplace, there are takers - who take liquidity away from the marketplace - and there are makers, who add liquidity to the market.

Makers are rewarded for helping to make the market more efficient with a lower fee.

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