Trade Volume – The size of a trade, typically measured in lots or base currency units. In Forex, one standard lot is usually 100,000 units of base currency. Robots set volume based on risk or strategy (for example, volume = 100000 for 1 lot in cTrader). Trade volume determines position size and market impact. Higher volume may require more liquidity to execute without moving the price. In APIs, volume is a required parameter for market/limit orders. Proper volume (position sizing) ensures that trade risk matches the trader’s rules.

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