An order execution mode where a trade is filled at the best available current price in the market, rather than a pre-specified price. With market execution, there are no requotes – the order will execute even if the price has changed; however, this means you may get filled at a slightly different price (positive or negative slippage) compared to when the order was sent. Most ECN/STP brokers operate with market execution. The advantage is faster execution and virtually guaranteed fills, which is beneficial for fast-moving market strategies (your EA’s order won’t be rejected due to price changes). The trade-off is that the exact fill price is not guaranteed – it could be a few pips off during volatile moves. Well-designed robots often prefer market execution to ensure their trades are executed, and they may include slippage allowances in their logic. Always test how your EA handles slight slippage, as results can differ from backtests if slippage is not accounted for.

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