# Passive Only **Passive Only** ensures that the engine **does not cross the spread or take liquidity**, meaning all fills will be **maker-type (limit) orders**. This setting helps traders **add liquidity to the market** while reducing execution costs, as **maker fees are typically lower than taker fees**. #### **How It Works** * The engine **only places passive limit orders**, preventing orders from executing immediately as taker orders. * Helps traders **optimize execution costs** by avoiding **higher taker fees**. #### **Considerations** * **Fill quantities may occasionally fall below the trajectory's lower bound**, as the engine **cannot guarantee fills without taking liquidity**. * **Orders may not reach the full target quantity** if the **duration expires** before all fills are completed. This setting is useful for traders prioritizing **cost efficiency over execution speed**, ensuring all orders contribute to market liquidity. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.tread.fi/creating-and-submitting-orders/advanced-settings/passive-only.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.