Depth of Market
In simple terms
Depth of market shows how many people want to buy or sell a cryptocurrency at different prices. Think of it like a store shelf where you can see how many customers are waiting to buy at $100 versus $101—the deeper the market, the easier it is to make a trade without moving the price too much.
Definition
The volume of buy and sell orders at various price levels, visible in the order book.
In depth
Depth of market (DOM) represents the aggregated volume of limit orders at each price level in an exchange's order book, typically displayed as a two-sided visualization showing buy orders (bids) and sell orders (asks) stacked by price. Market depth indicates liquidity by revealing how many orders must be filled to execute a trade of a given size; shallow depth means large trades will experience significant price slippage, while deep markets allow substantial transactions with minimal price impact. DOM data feeds directly from the matching engine that processes orders on centralized exchanges, and this information is crucial for traders assessing execution risk and for market makers who profit from the bid-ask spread by providing liquidity at multiple price levels.
How does Depth of Market work?
Depth of market is the full ladder of resting limit orders, aggregated by price level on both sides of the book. A depth display lists each price with the total quantity waiting there; a depth chart plots the same data cumulatively, so the steepness of the curve shows how quickly price would move against size. To estimate an order's cost, add quantities outward from the best price until the size is covered. Because resting orders can be cancelled in an instant, depth is a snapshot of intent, not committed volume.
An example
Illustrative figures only. The bid side shows 5 units at $99.90, 8 at $99.80, and 12 at $99.70. Selling 15 units clears the first two levels and 2 units of the third: $499.50 plus $798.40 plus $199.40, or $1,497.30, an average of $99.82. Selling just 4 units would have filled entirely at $99.90, which shows how depth determines the true cost of size.
Figures are illustrative only.
What beginners get wrong
- Displayed depth is not a commitment, and large resting orders are routinely cancelled milliseconds before they would be hit.
- A visible wall of orders at one price is often read as support, but spoofed walls are placed precisely to be seen.
- Depth belongs to one pair on one venue, so the same asset can be deep on one exchange and thin on another.
- Judging liquidity from the top of the book alone hides how thin the levels sitting behind it may actually be.
Related terms
Part of
How does crypto trading and market structure work? — the subject page for trading and market structure, with all 27 of its definitions in one place.
Educational only — not financial advice.