Commission is charged proportionally, based on the lot size you trade.
If the commission is $3.5 per side, per 1.0 lot, then trading a smaller volume means paying a smaller commission.
Example (ECN Account):
Commission: $3.5 per side, per 1.0 lot
Trade size: 0.2 lots (EUR/USD)
Commission calculation:
Opening the trade:
$3.5 × 0.2 = $0.70Closing the trade:
$3.5 × 0.2 = $0.70
👉 Total Round Turn commission: $1.40