Glossary

What is an Order Book? How to Read Those Numbers Below the Chart

FoxPress Editorial · 2026-04-22 · 13 min read

The Order Book is a real-time list of all currently open buy and sell orders for a specific asset. While it may look complex to a beginner, it essentially consists of two things: people wanting to buy and people wanting to sell. You can find it on the spot trading page of the Binance Official Website. On the Binance Official APP, you can see it by scrolling down on the trading screen. For regional switching instructions, refer to Binance App Download. Let's explain how it works.

Basic Structure of an Order Book

Section	Color	Meaning
Upper	Red	Sell Orders (Asks), sorted by price in ascending order.
Middle	Latest Price	The price of the most recent successful trade.
Lower	Green	Buy Orders (Bids), sorted by price in descending order.

An Example Walk-through

BTC/USDT Order Book:

Sell Orders (Red)
70010  Qty 0.05
70008  Qty 0.10
70005  Qty 0.20
70003  Qty 0.50  ← Cheapest Sell Order (Ask 1)
==========
70000  ← Latest Traded Price
==========
69998  Qty 0.40  ← Highest Buy Order (Bid 1)
69995  Qty 0.30
69990  Qty 0.50
69985  Qty 0.60
Buy Orders (Green)

The Role of the Order Book in Trading

1. Counterparty Matching

When you place a Market Buy order, the system "eats" into the cheapest available sell orders:

First, the 0.5 BTC at 70,003.
Then, the 0.2 BTC at 70,005.
...and so on, until your order is filled.

2. Price Reference

The "Latest Price" tells you what the market currently believes the asset is worth based on actual transactions.

3. Liquidity Indicator

A dense order book with many orders indicates high liquidity, meaning you can buy or sell large amounts with minimal "slippage."

Depth Charts

A Depth Chart is a visual representation of the order book:

X-Axis: Price.
Y-Axis: Cumulative Order Volume.
Red Side: Sell side accumulation.
Green Side: Buy side accumulation.

Beginners usually don't need to study depth charts; the numbers in the order book are sufficient.

Bid and Ask Prices

Term	Meaning
Bid 1	The highest buy price (the price you get if you sell immediately).
Ask 1	The lowest sell price (the price you pay if you buy immediately).

Spread = Ask 1 - Bid 1.

For major pairs like BTC/USDT, the spread is usually within 0.01%. For "altcoins" or small-cap coins, it can be 0.5% or higher.

Deep vs. Shallow Liquidity

Deep Liquidity (High Liquidity)

Seen in major coins (BTC, ETH).
Dense order book with continuous price levels.
Low slippage for large orders.
Ideal for all types of traders.

Shallow Liquidity (Low Liquidity)

Seen in small-cap or newly listed coins.
Sparse order book with large gaps between prices.
High slippage for large orders.
Vulnerable to "price crashes" from single large sells.

Beginners should stick to coins with deep liquidity.

Order Book "Signals"

Signal 1: Large Buy Wall

A massive buy order (e.g., 100 BTC) appears at a certain price level. This might indicate:

A "Whale" supporting that price.
Others following the buy lead.
The price is unlikely to drop below that level in the short term.

However, be careful — these can be "fake orders" placed just to manipulate market sentiment.

Signal 2: Large Sell Wall

A massive sell order at a certain price level suggests that the price is unlikely to break through that level in the short term.

Signal 3: Thin Zones

Sparse orders around a certain price level mean the price could move through that zone very quickly (up or down).

Fake Order Books

In some small-cap markets:

Market makers might place large "spoof" orders to create pressure.
Beginners get scared and sell.
The market maker cancels the order before it's filled.

Beginners should not over-interpret order book signals for small-cap coins.

Using the Order Book for Decisions

How beginners should use it:

Check the spread to judge liquidity.
Look at the distribution of orders to see where the pressure is.
Don't rely on it exclusively.

How advanced users use it:

Analyze order stacking.
Monitor price momentum.
Combine with candlestick (K-line) patterns.

For your first year, focusing on candlestick charts is usually enough.

Order Book vs. Candlestick (K-Line) Charts

K-Line charts show past trades, while the order book shows current untraded intent.

K-Line = History.
Order Book = The Present.

You need to look at both for a complete picture.

Real-Time Latency

Binance Web and App order books have minimal latency:

WebSocket provides real-time updates (millisecond level).
During extreme volatility, there might be a 1–2 second delay.
What you see might not be the absolute millisecond-accurate state.

This rarely affects regular trading for major coins.

Order Book in Extreme Markets

During extreme market volatility:

Liquidity can dry up instantly.
Spreads can widen significantly.
Large market orders can suffer severe slippage.

In such times, beginners should avoid large market orders. Use limit orders or simply stay on the sidelines.

Glossary of Terms

Term	English
Order Book	Order Book
Buy Order	Bid
Sell Order	Ask
Price Spread	Spread
Depth	Depth
Liquidity	Liquidity

Usage Recommendations for Beginners

Use Case	Recommended for Beginners?
Checking spread for liquidity	✓
Deciding to buy/sell based on orders	×
Following large "Whale" orders	×
Detecting signals for volatility	×

FAQ

Q: Can I put my own order in the Order Book?
A: Yes. Placing a "Limit Order" puts your order into the book.

Q: How long does an order stay in the book?
A: By default, 30 days, or until filled or cancelled. You can also set shorter durations.

Q: What do the numbers in each row mean?
A: Each row represents a specific price level and the cumulative volume of orders at that price.

Q: Can the Order Book predict price movements?
A: It provides signals, but it cannot accurately predict future prices. Don't over-rely on it as a beginner.