MidPrice Algo Orders

The MidPrice order is designed to split the difference between the bid and ask prices, and fill at the current midpoint of the NBBO or better. Set an optional price cap to define the highest price (for a buy order) or the lowest price (for a sell order) you are willing to accept.

To achieve the midpoint price or better, the Midprice algo routes the order to the exchange with the highest probability of filling as a Pegged-to-Midpoint order, or in the case of IEX as a Discretionary Peg (D-Peg) order. If no such exchange is available, the MidPrice order is routed as either a native or simulated Relative order.


The Reference Table to the upper right provides a general summary of the order type characteristics. The checked features are applicable in some combination, but do not necessarily work in conjunction with all other checked features. For example, if Options and Stocks, US and Non-US, and Smart and Directed are all checked, it does not follow that all US and Non-US Smart and direct-routed stocks support the order type. It may be the case that only Smart-routed US Stocks, direct-routed Non-US stocks and Smart-routed US Options are supported.

Products Availability Routing TWS
Stocks US Products Smart Attribute
Non-US Products Directed Algo Order Type
Time in Force
Open Users' Guide