The standard unit size of a forex transaction. 1 Standard Lot in forex is typically 100,000 units of the base currency. Brokers also offer smaller lot sizes: Mini Lot (0.1 lot = 10,000 units), Micro Lot (0.01 lot = 1,000 units), and sometimes Nano Lot (0.001 lot = 100 units). For example, if your EA buys 1.00 lot of EUR/USD, it is buying €100,000. If it buys 0.10 lot, that’s €10,000. The concept of lots also ties into pip value – e.g., in a 1.0 lot EUR/USD trade, one pip movement is $10; in a 0.1 lot trade, one pip is $1, etc. Understanding lot sizes is important for position sizing in robots: you may need to adjust the lot size (volume) parameter of an EA based on your account balance and risk settings. (Note: For non-forex CFD instruments, the lot definition may vary – e.g., 1 lot of Gold might be 100 ounces – but the trading platform abstracts this so that you still enter volume in lots.)

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