Market Sell

When a trader places a market sell, they are instructing the exchange to fill the order immediately against whatever buy orders currently sit on the book, rather than waiting for a specific price. The trade executes as a "taker," matching against the highest available bid first, then working down through lower bids until the full amount is sold.

Because the fill price depends entirely on existing demand in the order book, a market sell on a thin or illiquid pair can move noticeably below the last traded price. This gap between the expected price and the actual execution price is known as slippage, and it grows with order size: a small sell might barely dent the top bid, while a large one can walk through several price levels and drag the average fill down significantly.

Market sells are useful when speed matters more than price, for example exiting a fast-moving position during high volatility or reacting to breaking news. Most exchanges also charge higher "taker" fees for market orders than for limit orders, since market orders consume liquidity rather than adding it.

Before submitting one, checking the order book depth around the current bid helps estimate how much slippage to expect. On thin markets, splitting a large sell into smaller pieces, or using a limit order instead, generally produces a better average price.