> ## Documentation Index > Fetch the complete documentation index at: https://docs.pacifica.fi/llms.txt > Use this file to discover all available pages before exploring further. # Chase > Automatically reprice a post-only limit order to follow the best bid or ask while seeking a maker fill. A Chase order follows the best bid for a buy or the best ask for a sell. Pacifica reprices the unfilled amount as that price changes. Orders are post-only, so fills pay maker fees. A fill is not guaranteed. Chase order form with Chase until mode, Chase To Price, breach action and TP/SL ## How it works 1. When you place the order, Pacifica places a post-only (ALO) limit order at the current best bid (for a buy) or best ask (for a sell). 2. When the best bid or ask changes, Pacifica reprices your order. Only the unfilled remainder is moved, so partial fills are kept. 3. The order finishes when the whole amount has filled, when you cancel it, or when a price boundary cancels it. A boundary can also pause repricing. Because the order is always post-only, it never takes liquidity. It can only be filled by someone else crossing the spread into it. ## Settings | Setting | Options | What it does | | ----------------------------------------------- | ----------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Chase until** | **To Price** or **Till Fill** | **To Price** stops chasing at a limit you set. **Till Fill** keeps chasing until the order is fully filled or you cancel it, with no price boundary. | | **Chase To Price** | Positive price | The furthest price you are willing to chase to. For a buy it is a ceiling, for a sell it is a floor. The form pre-fills this at 0.5% away from the current price. Reaching the price exactly is still allowed. Only moving past it triggers the breach action. | | **If price moves above / below Chase To Price** | **Pause** or **Cancel** | What happens when the best bid or ask moves past your boundary. **Pause** stops repricing but leaves the resting order able to fill. Repricing resumes when the price returns inside the boundary. **Cancel** ends the strategy and cancels the resting order. | | **Reduce Only** | On / Off | Only reduces an existing position. Cannot be combined with **TP/SL**. | | **TP/SL** | Optional | A take profit and/or stop loss attached to the position the chase opens. They stay attached when the order is repriced. | ## Example BTC has a best bid of \$100,000 and a best ask of \$100,010. You want to buy 0.1 BTC without crossing the spread: * Place a **Chase** buy for 0.1 BTC, with **To Price** set to \$100,500 and breach action **Cancel**. * Your order rests at \$100,000. If the bid ticks up to \$100,001, your order follows to \$100,001. * If sellers hit your bid, you fill as a maker. If the best bid goes above \$100,500, the chase is cancelled and you can decide what to do next. ## Good to know * Each reprice replaces the resting order, so your order joins the back of the queue at the new price level. * A Chase can partially fill many times on its way to completion. Every fill shows up in **Trade History** and counts toward the total. * Chase orders can also be created from the **Positions** panel to reduce a position with a post-only order. * Chase orders appear under the **Strategies** tab (**Auto Chase** sub-tab) while they are working.