How to Read an Order Book: Crypto Trading Basics [2026]

1. What is an order book?

An order book lists the exchange's current buy and sell orders by price, showing market supply and demand in real time.

2. Order-book structure

Sell orders, asks $69,100 | 5.2 BTC $69,050 | 3.1 BTC ← Best ask ───────────────────── $69,000 | 4.5 BTC ← Best bid $68,950 | 8.3 BTC Buy orders, bids Spread = $69,050 − $69,000 = $50

3. Core concepts

Buy wall

A large concentration of buy orders at one price. It can act as support, making it harder for price to fall below that level in the source's explanation.

Sell wall

A large concentration of sell orders at one price. It can act as resistance, making it harder for price to break above that level.

Spread

The difference between the best ask and best bid. A narrower spread indicates better liquidity in this comparison.

4. Beware of spoofing

⚠️ Fake orders

Spoofing places large deceptive orders to mislead other traders, an activity the source describes as illegal. A large buy wall may disappear when price approaches it. Do not rely blindly on the order book.

5. AI and order books

The source describes AI as analyzing order-book data to execute efficiently at prices with abundant liquidity.

🃏 AI order-book analysis

AI automatically executes orders at prices it identifies as optimal.

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