What is market order?
An instruction to buy or sell immediately at the best available price.
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In this entry
An instruction to buy or sell immediately at the best available price.
Market orders execute reliably but pay the spread and the taker fee. This is the order type behind almost every simple buy button, so most people place one on their first purchase without ever choosing it. On an advanced trading screen it sits beside the limit order as the other basic choice.
What a market order guarantees is execution, not price. You are telling the exchange to fill your order whatever it costs, walking up the book until the size is complete. On a deep pair that is a fraction of a percent. On a thin one it can be several percent, and the difference does not appear anywhere in the fee schedule.
How it works
- You submit a size, either in units of the asset or in the quote currency.
- The matching engine fills against the best resting offer, then the next, until your size is complete.
- The fill price you receive is the average across every level it touched.
- The order is charged at the taker rate, because it removed liquidity rather than adding it.
Two guardrails exist on most venues. A slippage tolerance rejects the order if the average fill would be worse than a percentage you set. A circuit breaker or price band refuses fills beyond a certain distance from the reference price, which stops an order from clearing an entire thin book during an outage.
Where an exchange offers a market order denominated in the quote currency, "$500 of Bitcoin" and "0.005 Bitcoin" are different instructions. The first fixes what you spend, the second fixes what you receive.
Example
Illustrative comparison of the same $500 buy on a deep pair and a thin one, at a 0.25% taker fee.
| Book | Quoted best offer | Average fill | Slippage cost | Taker fee | All-in |
|---|---|---|---|---|---|
| Deep major pair | $100.00 | $100.02 | $0.10 | $1.25 | $1.35 |
| Thin small-cap pair | $100.00 | $101.60 | $8.00 | $1.25 | $9.25 |
The fee is identical. The cost is not, and the expensive part is the one no fee page lists.
Why it matters when you buy
A market order is the right choice when you value certainty and the pair is deep. It is the wrong choice on a thin pair or a large order, where a limit order costs less. Check the measured slippage for your intended size on the liquidity pages before deciding, and compare taker rates across venues on the fee comparison. For a recurring purchase, the difference compounds.
Related terms
- limit order — sets a price, not immediacy
- slippage — the cost of walking the book
- slippage tolerance — the guardrail you can set
- market depth — what decides how far you walk
- taker — the fee side you land on
- spread — paid on every market order
Questions
Will a market order always fill?
Almost always, but not at a price you controlled. If the book is thin enough or a price band is hit, part of the order can be rejected or cancelled rather than filled.
Should I use a market order or a limit order?
Use a market order when execution certainty matters more than a small price difference and the pair is liquid. Use a limit order when you can wait, when the book is thin, or when the order is large relative to resting depth.
Does the simple buy button place a market order?
Usually yes, and often at a wider all-in price than the same venue's advanced trading screen. Compare the two before assuming they cost the same.
Guides that use this term
- How Crypto Exchanges Make Money
A crypto exchange earns most of its money from trading fees charged on both sides of every trade, and adds revenue from the spread built into simple buy buttons, deposit and withdrawal charges, listing arrangements, interest on customer balances, and paid products such as staking and derivatives.
- Limit vs Market Orders: When to Use Each
A market order buys immediately at whatever price the order book offers, and a limit order buys only at a price you name or better, so the choice is between certainty of execution and certainty of price, and on most exchanges it is also a choice between two different fee rates.
- Recurring Buys on Exchanges: How They Work and What They Cost
A recurring buy is a standing instruction that tells an exchange to purchase a fixed amount of an asset on a schedule, funded either from your cash balance or by pulling from a linked bank account, and it is usually priced as a separate product at a higher rate than the same order placed by hand.
- Spread and Slippage: The Costs That Aren't on the Fee Page
The spread is the gap between the price you can buy at and the price you can sell at in the same moment, and slippage is the difference between the price you were shown and the price your order actually filled at, and neither one appears as a line item on your trade confirmation.