How the two legs place orders
How the two legs work together when they place orders. It follows from the two legs’ order types and has no setting of its own.
In the product
| execution mode | |
|---|---|
| both legs at market | Both legs trade at market at the same time, and any unfilled part is topped up automatically. |
| one leg post-only | One leg rests a post-only order first, and the other leg follows at market for the filled quantity. The resting leg can be either the long or the short leg. |
| both legs post-only | Both legs rest post-only orders at the same time. Whichever fills first leads the other to catch up. |
How to read it
Market orders fill fast and pay the taker fee. post-only orders fill at their resting price, pay the maker fee and may not fill. liquidation guard, automatic alignment and small-position cleanup always trade at market, whatever the legs’ order types. See Open and close with post-only orders.