市價成交

What is Market execution in forex and CFD trading

Market execution is an order type that instructs the broker to fill a trade immediately at the best available price currently offered by the liquidity providers, prioritizing speed and certainty of 執行 over a specific price level. This is critical for real trading decisions because it ensures the trader enters or exits the market as quickly as possible, which is essential for momentum, news, and scalping strategies, though the final executed price may involve slippage. A trader verifies Market execution by selecting it as the order type on the platform’s order ticket, usually labeled “Market Order” or “Execute at Market,” and then checking the trade history for an immediate fill price which may differ slightly from the displayed quote.

Key facts about Market execution

• Priority: Market execution prioritizes order execution speed and filling the full requested volume over receiving a guaranteed entry price.
• Price: The final execution price is the best bid (for selling) or ask (for buying) price available on the liquidity provider’s price stream at the moment the order is filled.
• Order Status: Orders submitted via Market execution are filled immediately and do not remain pending; the status is either “Filled” or “Rejected” (for lack of liquidity or disconnection).
• Slippage: Orders using Market execution are subject to slippage, meaning the executed price can be better or worse than the price displayed when the order was submitted.
• Usage: Predominantly used for time-sensitive strategies like news trading, where immediate entry/exit is more valuable than price precision.
• Requotes: Brokers using an ECN/STP model typically use Market execution and do not issue requotes; any price movement is absorbed as slippage.
• Time-in-Force: Market execution orders are typically treated as Immediate-or-Cancel (IOC) by default, aiming for a full fill instantly.

How Market execution works in forex and CFD trading

The Market execution mechanism is designed for immediate conversion of a trading decision into a live position by utilizing the price feeds from the broker’s liquidity pool.

此流程包含以下依序進行的步驟：

1. Order Request: The trader submits a 市價單 (e.g., Buy 1 standard lot of EUR/USD).
2. Server Transmission: The order is instantly transmitted to the broker’s execution server.
3. Liquidity Sweep: The execution engine scans the aggregated bid and ask quotes from all connected liquidity providers (LPs).
4. Best Price Selection: The system identifies the best available counter-price, for instance, the lowest 賣出價 for a Buy order.
5. Execution and Fill: The order is filled at the identified price, potentially across multiple price levels (depth of market) if the order size is large, which constitutes the final Market execution price.
6. Confirmation: The final executed price is instantly sent back to the trader’s platform, and the new live position appears in the account.

Example of Market execution with a real trade

This example demonstrates the result of a Market execution, including the potential for slippage.

How Market execution affects your cost and risk

Market execution does not directly change the base trading cost (spread/commission), but it directly introduces execution price risk due to the possibility of slippage, which impacts the initial PnL. It minimizes the risk of non-execution inherent in limit orders.

Market execution compared with related concepts

Market execution vs Instant execution

Market execution is a method where the trader accepts the best available price offered by the liquidity pool, resulting in price slippage but immediate execution without requotes, typically used by ECN brokers. 即時執行 is a method where the broker attempts to fill the order at the exact price quoted to the trader; if the price is unavailable, the order is requoted to the trader for manual confirmation, typically used by market makers. Market execution prioritizes speed; Instant execution prioritizes a guaranteed price or a requote.

Market execution vs Limit Order

Market execution is an order to buy or sell immediately at the current market price, prioritizing entry regardless of minor price changes. A 限價單 is an instruction to buy or sell only at a specified price or better, prioritizing price certainty and accepting that the order may not be executed (no fill). Market execution offers certainty of fill; a Limit Order offers certainty of price.

Broker differences in Market execution across the industry

The quality and outcome of Market execution are directly dependent on the broker’s underlying execution philosophy, primarily whether they are a Market Maker or an ECN/STP.

How to verify Market execution on your trading platform

Verifying and using Market execution is a standard process on most platforms, but the key is confirming its behavior, particularly slippage.

• Open the Order Panel: Navigate to the order creation window for your desired instrument (e.g., EUR/USD).
• Select Market Execution: In MT4, MT5, or TraderEvolution, ensure the Order Type is set to “Market Execution” or “Market Order.”
• Disable Price Control (MT4/MT5): For a pure test of Market execution, set the “Maximum Deviation” field to 0. This ensures the order is filled without any price tolerance (on ECN, this still means the best available price).
• Submit the Order: Click the Buy or Sell button.
• Check History Immediately: Open the Account History tab and find the execution record.
• Compare Price: Compare the actual Executed Price to the price displayed on the chart at the moment you clicked the button.
• Verify Status: The status should be “Filled” with no subsequent “Rejected” or “Canceled” message.
• 合理性檢查： A Market execution order must result in an immediate fill; if a pop-up appears or the order remains pending, the order type was not true Market execution, but rather Instant execution or a conditional order.

For a broader understanding of related trading concepts, explore our full glossary.