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Market FOK order Meaning

A "Market Fill-or-Kill" order. This is a request to buy or sell a specific amount of an asset at the current market price immediately.

If the entire amount cannot be filled immediately (e.g., because there isn't enough depth), the entire order is canceled. This is a very "aggressive" order type.

It prioritizes "Total Execution" and "Speed." It is used when a trader needs a specific "Size" to complete a trade and isn't willing to accept a partial fill, but is willing to pay the "Market Price" to get it done now. For example, if an arbitrageur sees a $100 profit opportunity that requires 10 ETH, they will use a FOK order.

If they only get 5 ETH, they might not make enough to cover their "Gas Fees," so they'd rather have the order fail completely than receive a partial fill.

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