# Depth Chart

See where visible buy and sell liquidity is concentrated around the current market.

**The Depth Chart turns the Order Book into two cumulative curves.** Use it to see how visible liquidity is distributed around the spread before choosing an order size or price.

![Depth Chart](https://media.polyester.com/cdn-cgi/image/width=800,quality=80,format=auto,fit=scale-down/content-assets/a/c5f4afe50c180800e966b53faf7a8dd75476488326af909a774783f71c439ca3/source.webp)

## What the widget shows

| Element             | What it means                                           |
| ------------------- | ------------------------------------------------------- |
| Buy depth           | Cumulative displayed buy quantity up to each price      |
| Sell depth          | Cumulative displayed sell quantity up to each price     |
| Horizontal position | How far a price is from the center of the market        |
| Vertical height     | How much visible quantity has accumulated by that price |
| Center gap          | The area between the best visible buy and sell prices   |

Hover over a curve to inspect its price and cumulative amount. A steep section means more displayed quantity is concentrated in a smaller price range.

## Use it with the Order Book

The Depth Chart and [Order Book](https://testnet.polyester.com/docs/user-docs/trade/widgets/order-book) describe the same visible liquidity in different ways. Use the chart to understand shape and concentration. Use the Order Book when you need exact prices, amounts, and cumulative totals.

> **Displayed depth can change**
>
> The chart is not a guaranteed quote. Orders can fill, move, or cancel before another order reaches the market, and a larger order can execute across several price levels.

## Confirm the chart is current

Confirm the active Pair and connection state before relying on the curves. After a disconnect, wait for the widget to rebuild from a fresh Order Book snapshot rather than treating the first new update as a complete view.