> ## Documentation Index
> Fetch the complete documentation index at: https://docs.amberdata.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Bid Ask Spread

# Description

Bid-Ask Spread measures the difference between the best bid and best ask prices for a particular instrument. It returns both:

* The absolute spread (in quote currency)
* The spread as a percentage of the mid-price

This dual representation allows for cross-instrument and cross-exchange comparison of liquidity conditions.

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# Details

This metric provides a view of market tightness and liquidity fragmentation. By analyzing how wide or narrow the spread is, traders can quickly identify:

* The most liquid exchange for a given asset
* Which instruments offer the best execution conditions

The percentage spread is especially useful when comparing instruments with different quote currencies (e.g., BTC-USDT vs. BTC-USD vs. BTC-EUR), as it normalizes price scale effects.

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# API Endpoint

[/derivatives-analytics-bid-ask-spread](/http/analytics/derivatives/bid-ask-spread)

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# Availability

We cover all instruments on major exchanges like Binance, Deribit, OKX (Okex) and more.

Please use the information endpoint to find all coverage and exact instruments.

| Exchange    | History                     | Depth Order Count |
| :---------- | :-------------------------- | :---------------- |
| Arkham      | 2025-08-10 (end 2026-02-16) | Full              |
| Binance     | 2024-01-01                  | 1000              |
| Bitmex      | 2024-01-01                  | Full              |
| Bybit       | 2024-01-01                  | 500               |
| Deribit     | 2024-01-01                  | Full              |
| Hyperliquid | 2025-03-19                  | 20                |
| Kraken      | 2024-01-01                  | Full              |
| Okex (OKX)  | 2024-01-01                  | 2000              |

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# Frequently Asked Questions

**How is the absolute spread calculated?**

* `spread = bestAskPrice − bestBidPrice`
* This is returned in the quote currency of the instrument.

**What does spreadPercent represent?**

* It’s the absolute spread divided by the mid-price:
* `spreadPercent = (spread / midPrice) × 100`
* This normalizes spread data across different pairs.