Post-Only

What "Post-Only" means

"Post-Only" is a mode for traders who want to pay a lower fee. It makes sure your order goes onto the order book and waits (as a maker) instead of executing instantly against someone else's price (as a taker, who pays a higher fee). If the order would execute immediately when placed, the exchange rejects it instead of filling it. This is one of the time-in-force (TIF) settings, not a separate submit button.