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Can Orders Be Guaranteed to Fill?

September 30, 2025 at 07:48 PM
Dear Users,
 
You may wonder whether your orders can always be guaranteed to be filled. To help clarify, please see the explanations and recommendations below:
 

Common Reasons for Unfilled Orders

1. Price Mismatch
Your order price does not match the current executable market price.

  • Example: The best ask price is 10.05 USDT, but you placed a buy order at 10 USDT, so it cannot be executed immediately.

  • Analysis: The exchange follows a price-time priority matching mechanism. Only orders that meet the price condition are executed right away.

2. K-line Reaches Price but Order Not Filled
The chart may show that the price touched your order, but it was not executed.

  • Analysis:

    • K-line highs/lows represent price ranges, not actual traded volume.

    • Market depth may be insufficient even if the price is reached.

    • At the same price level, orders are matched by submission time. If earlier orders remain unfilled, your order will queue.

3. Fast Market Fluctuations
In volatile markets, the price may briefly touch your order but move away too quickly to execute.

4. Partial Fill
Large orders may be filled only in part if market depth is insufficient, leaving the remainder unfilled.

5. Copy Trading with FOK Orders 
In Copy Trading, when a Trader places an order, the Copier’s order is executed using FOK (Fill or Kill). This means the order must be fully executed immediately or else it is canceled.
  • Analysis:
    • FOK does not allow partial fills — it must be all-or-nothing.
    • Because market depth and counterparty orders are limited, Copy Trading orders cannot be guaranteed to execute 100%.
  • Example: If a Trader buys at 10.00 USDT but the available sell-side volume is insufficient for the Copier’s entire order, the Copier’s order will be canceled.
     

Conditional Order (Plan Order) Explanation

1. Conditional orders are only submitted to the market after being triggered.
2. The entry time depends on the trigger moment; once triggered, the order is matched at the user-specified price.
3. Conditional orders are not guaranteed to fill and remain subject to market conditions.
 

Methods to Increase Fill Probability

Adjust Price: Increase buy price or lower sell price to match the market executable price.
Observe Market Depth: Check the order book before placing orders and select prices with sufficient liquidity.
Use Market Orders: Market orders execute quickly but may incur slippage.
Split Orders: Large orders can be split into smaller batches to increase fill probability.
Set Appropriate Order Duration: GTC (Good Till Cancel) orders stay on the book longer.
Avoid Extreme Prices: Orders far from the market price have a low probability of being filled.
 

Frequently Asked Questions

Q: Can orders be guaranteed to fill?
A: No. Limit orders depend on price conditions and queue position. Market orders usually fill quickly but may still be affected by liquidity.

Q: Why does the K-line show my price was reached but my order wasn’t filled?
A: K-line shows price ranges, not executed volume. Filling requires a price match, sufficient depth, and time priority.

Q: Why was my large order only partially filled?
A: Market depth was insufficient, so only part of the order could be executed.

Q: Why wasn’t my market order fully filled?
A: In low-liquidity or highly volatile markets, market orders may partially fill or experience short delays.

Q: Can I place the order again after canceling?
A: Yes. You can adjust the price or split the order to increase the likelihood of execution.

Q: Why wasn’t my Copy Trading order filled? 
A: Copy Trading uses FOK orders, which must be fully executed immediately or canceled. If market depth is insufficient or prices move, the order may not fill.
 
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