What Is a Bid-Ask Spread?
The bid-ask spread is the difference between the buy price (bid) and the ask price (ask) of an asset.
- Bid price: The highest price buyers are willing to pay.
- Ask price: The lowest price sellers are willing to accept.
In cryptocurrency markets, these prices are determined in real-time through the order book on exchanges. The narrower the spread, the more liquid the market; the wider the spread, the higher the transaction cost.
The Bid Price Explained
The bid price represents the highest price that buyers in the market are willing to pay at that moment.
This price is:
- Determined by investors who place limit buy orders.
- It changes constantly and appears as the highest buy level in the order book.
For example:
- Highest buy order for BTC: $60,000
- Highest buy order for ETH: $3,200
This price shows the current demand.
The Ask Price Explained
The ask price is the lowest price that sellers are willing to accept.
This price is:
- Determined by investors who place limit sell orders.
- It appears as the lowest selling level in the order book.
For example:
- Lowest sell order for BTC: $60,010
- Lowest sell order for ETH: $3,205
The difference between the bid and the ask price constitutes the spread.
Key Takeaways
- Spread = Ask – Bid
- Narrow spread = High liquidity
- Widespread = High transaction cost
- Spread is an invisible “implicit fee”
- In high-volume and institutional markets, spreads are generally lower.
How Bid-Ask Spread Works in Crypto Markets
Crypto markets are open 24/7 and traded on multiple exchanges. This differentiates spread dynamics from traditional markets.
The Spread as a Transaction Cost
Spread is a hidden cost paid by the investor.
For example:
- Bid: $60,000
- Ask: $60,010
- Spread: $10
When you buy with a market order, you buy at the ask price. If you want to sell at the same time, you sell at the bid price. In this case, a loss of $10 automatically occurs.
Price Discovery Process
The continuous interaction between bid and ask prices creates the fair value of the market.
- Intense buying → ask price goes up
- Intense selling → bid price goes down
- The equilibrium between them → the real market price
This process is called price discovery.
Calculating Bid-Ask Spread
Spread measurement is done using several different methods.
Basic Spread Calculation (Dollar Amount)
Formula:
Spread = Ask – Bid
Example:
Ask: $60,010
Bid: $60,000
Spread = $10
Percentage Spread Calculation
Formula:
Spread % = (Ask – Bid) / Ask × 100
Example:
(10 / 60,010) × 100 ≈ 0.016%
Basis Points (bps) in Crypto Trading
1 basis point (b) = 0.01%
0.016% ≈ 1.6 bps
Professional traders usually evaluate the spread in bps.
Advanced Spread Metrics
- Weighted spread: Weighted average spread based on order volume
- Effective spread: The difference between the actual price and the mid-price
- Realized spread: Spread adjusted for market volatility
Bid-Ask Spread and Market Liquidity
There is a direct relationship between spread and liquidity.
Tight vs. Wide Spreads
Tight spread → Strong market, high volume
Widespread → Low volume, high risk
Market Depth and Order Books
As the total trading volume in the order book increases, the spread becomes more stable.
Liquidity Indicators
Spread is the most basic indicator of an asset’s tradability.
Factors That Impact Bid-Ask Spread in Crypto
Trading Volume
High 24-hour volume → Narrower spread
Market Volatility
Sudden price movements widen the spread. All Users
During the FTX crash week, the BTC spread increased from 1 bp to 4-5 bp.
Time of Day and Market Sessions
Liquidity is generally higher during US and European trading sessions.
Asset Market Capitalization
- Large cap (BTC, ETH) → Very narrow spread
- Mid-cap → Medium level
- Micro-cap → Widespread
Exchange and Market Structure
Exchanges with institutional market makers have lower spreads.
Perceived Risk and Market Events
Regulation news and hacking incidents can suddenly widen the spread.
The Role of Market Makers
Market makers keep the spread narrow by constantly providing buy and sell quotes.
How Market Makers Supply Liquidity
They provide liquidity to the market by continuously placing bid and ask orders.
Market Maker Incentives and Rebates
Many exchanges pay rebates to makers. This model generates hundreds of millions of dollars in volume per quarter.
Impact on Crypto Spread Compression
Since 2021, spreads have narrowed by approximately 40% due to institutional participation.
Bid-Ask Spread vs. Slippage
Spread and slippage are different concepts.
What Is Slippage?
The order is executed at a different price than the expected one.
How Spread Affects Slippage
Wide spread → Higher risk of slippage.
Positive vs. Negative Slippage
- Positive → Better price
- Negative → Worse price
Setting Slippage Tolerance
DEX systems typically have a tolerance range of 0.1–1%.
Interpreting Bid-Ask Spread: What’s “Good” in Crypto?
Large-Cap Crypto Benchmarks (BTC, ETH)
A drop below 5 bps is considered good. On major exchanges, drops below 1 bps may be seen.
Mid-Cap and Altcoin Spreads
The 20–50 bps range is common.
Low-Cap Token Spreads
It is common to see rates above 100 bps.
Context Matters: Spread Relative to Volatility
If volatility is high, a slightly wider spread may be acceptable.
Visualizing Spread: Depth Charts and Order Books
Reading the Order Book
The upper bid and ask levels determine the spread.
Depth Charts Explained
It visually displays cumulative trading volume.
Identifying Support and Resistance
Large buy walls can act as support, while sell walls can act as resistance.
Trading Strategies Based on Bid-Ask Spread
Market Orders vs. Limit Orders
Narrow spread → Market order
Wide spread → Limit order
Scalping and High-Frequency Trading
Requires a sub-bp spread.
Spread Trading and Arbitrage
Spread differences between different exchanges can create opportunities.
Market Timing with Spread Analysis
Narrowing spread → May be a consolidation signal.
Minimizing Negative Slippage
- Using limit orders
- Splitting orders
- Trading during liquid trading hours
Centralized vs. Decentralized Exchange Spreads
CEX Spread Characteristics
It is based on the order book model.
DEX Liquidity Pool Model
In the AMM model, the spread is implicitly embedded in the fee structure (0.05–0.30%).
Cost Comparison for Large Orders
CEX may be more advantageous for large orders.
Tools and Platforms for Monitoring Bid-Ask Spreads
Exchange Trading Interfaces
Stock exchange order book screens display real-time spreads.
Third-Party Analysis Platforms
Platforms like Trading View and Bookmap offer in-depth analysis.
Data APIs and Research Tools
Liquidity scores are used in spread analysis.
Market-Making Tools
Bot systems provide live spread tracking.
Real-World Examples and Case Studies
Example 1: BTC/USD Spread on Coinbase
A 1 bp spread on a $10,000 trade costs approximately $1.
Example 2: Low-Cap Altcoin Spread
A 150 bp spread on a trade of the same size → a cost of $150.
Example 3: Market Stress Impact
During the FTX crash week, the spread widened 4–5 times.
Impact of Regulatory Changes on Spreads
Spot BTC ETF Approval Effect
Institutional entries have increased depth and narrowed the spread.
Exchange Competition and Maker Incentives
As competition increases, spreads tend to narrow.
Common Mistakes When Dealing with Bid-Ask Spreads
Ignoring Spread Costs
It erodes profits for frequent traders.
Using Market Orders in Low-Liquidity Conditions
It creates a high risk of slippage.
Not Comparing Across Exchanges
Better price opportunities might be missed.
Advanced Concepts: Arbitrage and Bid-Ask Spread
Cross-Exchange Arbitrage
Profiting from price differences between exchanges.
Statistical Arbitrage Using Spread Data
Algorithmic strategies utilize spread data.
Frequently Asked Questions
H3: How to interpret bid-ask spread?
The bid-ask spread measures the cost of executing a transaction instantly.
For example, if the spread for BTC is 2 bps (0.02%), this means you are paying an implicit fee of 0.02% of your transaction size.
When evaluating the spread, consider the following:
Your time horizon:
- High-frequency trader → Sub-bp spread required
- Long-term investor → 20–30 bps tolerable
Your trade size: Spread costs increase exponentially for larger positions.
Comparison with volatility:
- In a coin that moves 5% per hour, 10 bps might be insignificant.
- In a stablecoin, 10 bps is quite expensive.
Spread should always be interpreted in the context of volatility and your trading strategy.
What is considered a good bid-ask spread?
The “good” spread varies depending on the market value of the asset:
- Large-cap tokens (BTC/USDT, ETH/USD) → Below 5 bps (<0.05%) is considered good
- Above 20 bps → Signal of weak liquidity or market stress
- Mid-cap tokens → 20–50 bps is the normal range
- Micro-cap tokens → Above 100 bps may be common
Don’t just look at the best buy/sell price. Also check the order book for depth of 2-10 levels.
What is the bid-ask spread in crypto?
In cryptocurrency markets, the bid-ask spread is the real-time difference between the best buy (bid) and best ask (ask) prices displayed on an exchange’s order book.
Because cryptocurrency markets operate 24/7 and are traded on numerous exchanges, the spread is:
- Global liquidity
- Funding rates
- Macro data releases
- Protocol hacks
- Regulation news
It constantly changes depending on the market.
During busy Asian and US sessions, spreads on major currency pairs can fall below 1 basis point; they can widen during low-volume hours or when volatility increases.
Why do spreads differ for different cryptocurrencies?
The main reason for spread differences is liquidity differences.
In high-volume assets like BTC and ETH:
- There are many market makers.
- The order book is deep.
- The spread is narrow.
In low-cap altcoins:
- There are fewer participants.
- The order book is thinner.
- Market makers take higher risks.
- The spread is wider.
The spread is priced according to the market maker’s inventory risk and transaction frequency.
How do market makers have a big impact on spreads?
Market makers provide liquidity by constantly entering both buy and sell quotes.
Their algorithms:
- Updates prices based on volatility
- Balances inventory risk
- Optimizes spread
Without market makers:
- The spread widens significantly.
- Price gaps form, especially during volatile periods.
What causes unexpected changes in spreads?
Sudden spread widening is commonly seen in the following situations:
- Regulatory announcements
- Exchange hacks
- Large volume orders emptying the book
- Sudden increase in volatility
- Low liquidity hours
During periods of market stress (e.g., during major crash weeks), the spread can increase 4-5 times.
How do I use spreads to make trading decisions?
Spread analysis plays a critical role in trade timing.
Narrow spread:
- High liquidity
- Suitable environment for large orders
Wide spread:
- Signal of increasing volatility
- Decreased liquidity
Also:
- Compare spreads across different exchanges
- Use limit orders during wide spread periods
- Break down large orders into smaller parts
What is the relationship between liquidity and spreads?
There is an inverse relationship between liquidity and spread.
- High liquidity → Narrow spread
- Low liquidity → Wide spread
In highly liquid markets, there are many buy and sell orders, which narrows the price difference.
In low-liquidity markets, the gap between the buy and sell prices widens.
Therefore, the spread is one of the most reliable indicators of market liquidity.
Disclaimer
The information provided in this article is for educational purposes only and should not be considered as financial advice. The content discusses the Bid-Ask Spread in Cryptocurrency and how it affects trading decisions. However, you should consult a qualified financial advisor before making any investment based on this content.
Investing in cryptocurrencies involves substantial risk. The volatility of the market can lead to significant financial losses. While understanding the Bid-Ask Spread in Cryptocurrency can enhance trading strategies, it is essential to recognize that past performance does not guarantee future results.
We strive to present accurate and up-to-date information; however, market conditions can change rapidly. Therefore, you are encouraged to do your own research and due diligence before engaging in any type of trading activity.
Please note that the authors and publishers of this article are not liable for any losses or damages arising from your reliance on the information provided herein. Always trade responsibly and within your risk tolerance.
