Post Only & TIF

Post Only

When placing a limit order, you can select Post Only to ensure it does not execute immediately. Instead, the order will be placed on the order book as a maker order, never matching with existing orders already in the book. Maker orders add liquidity, and when your order executes later, you will pay the maker fee rather than the taker fee.

Time-in-Force (TIF) determines how long your order remains active before being executed or canceled. This lets you control the duration of your order when placing it. Aster supports three types of TIF orders:

• GTC (Good ‘Til Cancelled): The order stays active until it is filled or you cancel it.

• IOC (Immediate or Cancel): The order attempts to execute immediately (fully or partially). Any unfilled portion is canceled. If no quantity is available at your chosen price, the entire order is canceled. Iceberg orders are not supported.

• FOK (Fill or Kill): The order must be filled in full immediately, or it will be canceled. Iceberg orders are not supported.