# Order Book Depth

<figure><img src="/files/k2IBQWFULmOAGMicT5nL" alt=""><figcaption><p>Spot and Perpetuals 1-10% Order Book Depth</p></figcaption></figure>

The **Order Book Depth Indicator** on TRDR provides a **real-time visualization of market liquidity imbalance**, showing the distribution of buy (bid) and sell (ask) orders at different price levels. It helps traders assess **market depth, supply and demand imbalances, and potential support/resistance zones**.

### **Key Features:**

* [x] **Liquidity Analysis** – Identifies strong order clusters that can act as support or resistance.
* [x] **Bid-Ask Imbalances** – Highlights potential price direction.
* [x] **Dynamic Market Depth** – Tracks real-time changes in order placement and cancellations.

### **How to Use It:**

* **Thicker order book walls** suggest strong support/resistance levels.
* **Disappearing liquidity** may indicate fake orders (spoofing) or upcoming volatility.

By combining the **OBD Indicator** with Open Interest, Order Book Changes widget and Trades widget, traders on TRDR gain a **comprehensive view of market sentiment and liquidity dynamics**.

1. **Bids and Asks** \
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   The foundation of the overlay lies in the order book depth (OBD). Let's explore its functionality:

<div align="right" data-full-width="true"><figure><img src="/files/TCHHIlZX0VL5PqEhd22e" alt="" width="374"><figcaption><p><strong>Depth</strong>: This term refers to the range from the price we want to examine, using 1%-2.5% from the best bid and asks in this instance. <br><br><strong>Overrides</strong>: If you choose 'spot,' the OBD data will only appear when you select a specific spot market. Different settings for different markets can be beneficial due to differences between Spot/Perpetuals/Futures markets.</p></figcaption></figure> <figure><img src="/files/dIuPwrX7pYvgDtJZssqy" alt=""><figcaption><p><strong>Bids</strong>: These are buy orders at a specified price. <br><br><strong>Asks</strong>: These are sell orders at a specified price. </p></figcaption></figure></div>

Using these settings, your chart will display information like:                                                   <br>

<figure><img src="/files/1dUcdzjMZwsgvF57OPpD" alt=""><figcaption><p><strong>Using these settings, your chart will display information like:</strong>           <br>Bids: ₿ <strong>1006</strong> Asks<strong>:</strong> ₿ 287<br></p></figcaption></figure>

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1.2 Delta\
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Delta: This term signifies the difference between two values. \
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**Calculation**: Bids - Asks. Delta = Bids (959) - Asks (285) = ₿ 674 more on the bid side, 1%-2.5% from the best bid and ask.\ <br>

<figure><img src="/files/x34GysKVRNERAehZMBC0" alt="" width="299"><figcaption><p>Under the style section you can select the <strong>Delta option</strong></p></figcaption></figure>

<div data-full-width="true"><figure><img src="/files/kk3lJS7j7O5VJEiOK1q1" alt=""><figcaption></figcaption></figure></div>

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**1.3 Ratio** \
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**Ratio**: A ratio demonstrates the comparative quantities of two variables. Using the bids and asks, a ratio can be calculated as followed: (bids 959 - asks 285) ÷ (bids 959 + asks 285) = 0.54.&#x20;

Alternatively, this can be expressed as bids - asks = -₿ 674 (delta) the total = 1244, so we divide the **delta** 674 ÷ **total** 1244 = 54% buyer dominance in the 1-2.5% range.&#x20;

Luckily our users don't have to go trough those calculations, our users can just enable the ratio setting under the style section:stuck\_out\_tongue\_winking\_eye:.

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&#x20;                             &#x20;

<figure><img src="/files/FRz5NmnXZPSwS29theVK" alt="" width="375"><figcaption></figcaption></figure>

<div align="left" data-full-width="true"><figure><img src="/files/QWRPE72xM73f9PckYjxH" alt=""><figcaption><p>From top to bottom:<br><strong>Ratio</strong><br><strong>Delta</strong><br><strong>Bids &#x26; Asks</strong></p></figcaption></figure></div>

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1.4 [Totals (liquidity)](/key-features-and-indicators/order-book-indicators/order-book-depth-totals-liquidity.md)\
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**Total**: Total = Bids + Asks. For instance, Bids ₿959 + Asks ₿285 = Total ₿1244.

<figure><img src="/files/4PjkRf0cfDHgm7AQcwas" alt="" width="375"><figcaption><p>Total enabled</p></figcaption></figure>

<div data-full-width="true"><figure><img src="/files/RmvwaCTNTSqLUu30qvJg" alt=""><figcaption></figcaption></figure></div>

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**1.5 Order book depth aggregation**

This feature displays the total from all exchanges for the chosen markets. You can select which exchanges to include in the aggregation, use markets (Spot/Perpetuals/Futures) of the same type or compare different markets, and decide which exchanges are to be included in the aggregation, for example, Binance & Coinbase. Aggregated order book data is expressed in $ instead of ₿ or ETH.

The image above offers a brief summary of all concepts explained so far. Now, let's apply the calculations for Binance (usdt+tusd+busd) and Coinbase on the spot markets: Bids: $25.641M Asks: $20.667M Delta = bids - asks = - $4.974M Ratio = bids - asks ÷ bids + asks = -10.74 Total = bids + asks = $46.308M

Below another example of spot + perpetuals, which paints a significantly different picture compared to the first example (spot). This explanation covers every function of the order book depth indicator.

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<div data-full-width="true"><figure><img src="/files/Nu5kwjicKCLCPGMwT3vF" alt=""><figcaption></figcaption></figure></div>

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