At most 0.1% back and forth, close the position if the profit is less than 0.1%?

📉 Shock! A single transaction fee eats up 60% of profits? A must-read contract fee trap for beginners!
Yesterday in the square, I saw a brother lamenting:
"Profit of 50U, but the fee deducted 30U!"
As a result… this was just the closing fee! Opening a position costs another 30U! 😱
🔍 Cold knowledge about contract fees:
▫️ Limit order (pending order): 0.02%
▫️ Market order (market order): 0.05%
💸 How to calculate fees?
👉 Position value = Quantity × Price
👉 Fee = Position value × Fee rate
📊 Case breakdown (market closing):
19.125 ETH × 3136.67 = 59988.81U
Fee = 59988.81 × 0.05% = 29.99U
Total fees for opening and closing ≈ 60U!
💡 The truth:
Did you think you made 50U?
Actual amount received: -10U!
This is the hidden reason why your account shows a loss!
🚨 Beginner’s guide to avoiding pitfalls:
✅ Try to use limit orders (lower fee rate)
✅ High-frequency trading must open a rebate
✅ Calculate costs before placing an order!