Futures traders often focus on leverage and entry price while ignoring two small toggles that can prevent costly mistakes: reduce-only and post-only. They sound similar because both restrict an order, but they solve different problems. Reduce-only is about position direction and size. Post-only is about whether the order adds liquidity instead of taking liquidity immediately.
Bybit’s help center says reduce-only orders are designed to strictly reduce an existing position and avoid unintentionally increasing or flipping exposure. OKX explains a similar rule: in one-way mode, traders can choose reduce-only orders to close a position, while in hedge mode close orders are reduce-only by default. This matters when a stop-loss fires first and an old take-profit order is still resting. Without reduce-only, that stale exit can become a new position in the opposite direction.
Post-only has a different job. Binance Academy describes a Limit Maker, or post-only, order as a limit order meant to add liquidity rather than execute immediately against an existing order. Kraken’s derivatives order-type documentation uses the same idea: if the order would immediately take liquidity, it is rejected or canceled. This can help control maker-versus-taker fees, but it can also mean the order never fills during a fast move.
A practical workflow is simple. Use reduce-only for exits, partial take-profits, and orders that must not enlarge exposure. Use post-only when maker fees and passive execution matter more than immediate fill certainty. Do not use post-only for emergency stops, and do not assume reduce-only guarantees a good exit price. It only controls whether the order can increase the position.
Sources: Bybit reduce-only order guide; OKX basic order types; Binance Academy order types; Kraken derivatives order types.
Risk notice: Order settings reduce execution mistakes but cannot remove market, liquidity, leverage, or liquidation risk. Practice with small size before using new futures controls.
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