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Limit post-only order Meaning

A specific type of limit order that is guaranteed to be added to the order book as a "Maker" order. If your order would have been filled immediately (meaning it would "Take" liquidity), a post-only order is automatically canceled by the exchange.

Why would someone want this? To save on fees.

Most exchanges charge lower fees (or even give "rebates") to "Makers" who add liquidity to the book. If you accidentally place a limit order at the current market price, it becomes a "Taker" order and you pay a higher fee.

Post-only orders are essential for "Market Makers" and "Arbitrageurs" whose profit margins are so thin that even a small difference in exchange fees can make a trade unprofitable. It ensures they always stay on the "Maker" side of the fee schedule.

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