Direct answer
“Buy by market” in forex typically means a market buy order: you submit a request to buy a currency pair immediately, and the trade is executed using the current available market prices rather than a preset future price.
Because market prices move continuously, the final fill (the actual trade price you get) may not match the price shown at the moment you placed the order.
How it works (market buy mechanics)
A forex order has an order type and a price handling rule. In a market buy:
- Order intent: buy the base/quote currencies for the selected pair (for example, buying one currency using the other as the quote currency).
- Execution approach: the broker or trading venue routes the order for execution against available liquidity at the time it arrives.
- Result: you receive a fill when execution occurs; the price is determined by the market at that moment.
A key related term is slippage: the difference between the price you expected and the price you actually receive. Slippage can happen when prices move quickly between the moment you place the order and the moment it is executed.
Example checks and what to look for
To independently confirm how “buy by market” behaves on your platform, focus on observable order details:
- Fill price vs. displayed price: compare the price shown in your order ticket to the reported execution (fill) price.
- Execution time: check timestamps to see how quickly the order filled after submission.
- Partial fills (if applicable): some systems may split execution into multiple fills rather than one.
- Order status wording: platforms often show whether the order was filled immediately or placed into a queue.
These checks do not predict outcomes; they help you understand what your specific broker or platform does with market buy orders under real conditions.
Relevant limitations and risks
Market buy orders come with uncertainty that differs from orders that use a fixed trigger price:
- No guaranteed exact price: since execution uses current available prices, the fill can differ from your expectation.
- Liquidity and volatility effects: thin liquidity or rapid price movement increases the chance of slippage.
- Platform wording differences: “buy by market” may be described differently across providers, so the safest interpretation is the underlying order type: market execution for a buy.
If you need a precise definition for your environment, compare the platform’s order-type description for “market buy” and review the execution fields shown in your trade confirmation.