How are contract trading fees calculated?
Market orders are always charged taker fees; limit orders are also charged taker fees if they match existing orders as soon as they are placed.
For frequent short-term trading, fees can add up to more than you might expect and make up a significant portion of your final returns.
Back to the market: $BTC is quoted at 75083.9 (24h +0.032%).
After a loss, don't immediately double your position to try to win it back—this often leads to even bigger losses.

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For reference only; not investment advice.