Order Book
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Key Takeaway
A real-time electronic record of all open buy and sell orders for a cryptocurrency on an exchange, showing the prices and quantities that traders are willing to transact at.
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What Is Order Book?
A real-time electronic record of all open buy and sell orders for a cryptocurrency on an exchange, showing the prices and quantities that traders are willing to transact at.
How Order Book Works
Frequently Asked Questions
What is an order book in crypto trading?
An order book is a real-time electronic record maintained by a cryptocurrency exchange that lists all open buy orders and sell orders for a specific trading pair. It shows the prices traders are willing to pay or accept and how much quantity is available at each price level. The buy side shows pending purchase orders arranged from the highest price downward; the sell side shows pending sale orders from the lowest price upward. The order book is the mechanism through which the exchange matches buyers and sellers to execute trades.
How does the order book affect the price I pay when buying crypto?
When you place a market buy order, the exchange fills it by matching it against the lowest-priced sell orders currently in the order book. If your order size is small relative to available supply at the best ask price, you will pay close to that price. If your order is large and exhausts all the supply at the best ask, it will continue filling at the next available price levels — each slightly higher than the last. This is why large market orders can result in a worse average price than the price you saw when you clicked buy, a phenomenon known as slippage.
Can I see the order book on my crypto exchange?
Yes — most centralised cryptocurrency exchanges display the order book directly within their trading interface, typically as a two-sided list or depth chart. The bid side usually appears in green and the ask side in red. You can see the price levels and quantities available in real time. Some exchanges also offer a visual depth chart that plots cumulative order volume against price, making it easier to see where large clusters of buy or sell orders are concentrated. Decentralised exchanges operate differently and may display liquidity in the form of automated market maker pool data rather than a traditional order book.
Common Misconceptions About Order Book
The order book shows every trade that has already happened.
The order book shows only open, unfilled orders — trades that traders want to make but have not yet been matched. Completed trades are recorded separately in the trade history or market feed, which logs executed transactions. These are distinct data sets. The order book is forward-looking, showing intent; the trade history is backward-looking, showing what has already occurred. Confusing the two is common for new traders but leads to misreading market activity and price formation signals.
A large order in the order book means that order will definitely execute at that price.
Orders in the book can be cancelled at any time before they are matched. A large buy or sell order sitting at a price level creates the appearance of strong support or resistance, but it may be pulled before the market reaches it. This tactic — placing large orders with no intention of executing them — is known as spoofing, and it is used to manipulate price perception. Treat large book orders as signals of potential interest, not confirmed commitments, and look for supporting evidence before drawing conclusions.
All crypto exchanges use the same order book.
Each centralised exchange maintains its own independent order book. A buy order on Binance only matches against sell orders on Binance; it has no connection to orders on Coinbase, Kraken, or any other platform. This is why the same cryptocurrency can trade at slightly different prices across exchanges at the same time — a difference that arbitrage traders actively exploit. The price you see on one exchange reflects the supply and demand of that specific platform's participants, not the entire global market.