Bid-Ask Spread
The difference between the highest price a buyer will pay (bid) and the lowest price a seller will accept (ask); a market maker's primary revenue source.
Bid-Ask Spread — The bid-ask spread is the difference between the highest price a buyer is willing to pay (bid) and the lowest price a seller is willing to accept (ask) for an asset. In crypto markets, tight spreads indicate healthy liquidity and active market making, while wide spreads signal low liquidity and higher trading costs.
What Is the Bid-Ask Spread?
The bid-ask spread represents the cost of immediate execution in a trading market. When you place a market buy order, you pay the ask price. When you sell, you receive the bid price. The spread between these two prices is effectively a fee paid to market makers who provide the liquidity for instant trades.
On major crypto pairs like BTC/USDT on Binance, the spread is often just $0.01 to $0.10 on a $60,000 asset — less than 0.001%. On smaller tokens listed on DEXs, spreads can range from 0.5% to 5% or more, directly impacting trading profitability.
How the Bid-Ask Spread Works
On centralized exchanges, the spread is determined by the most competitive buy and sell limit orders on the order book. Market makers continuously place and adjust these orders to maintain tight spreads. When a market maker quotes a bid of $1.00 and an ask of $1.02, the spread is $0.02 or 2%.
On DEXs using AMMs, the concept translates to price impact — the difference between buying and selling the same amount of a token. A pool with deep liquidity produces minimal price impact (tight effective spread), while a thin pool creates significant impact (wide effective spread).
Spreads widen during periods of high volatility, low liquidity, or market uncertainty. They tighten when multiple market makers compete for order flow and when trading volume is high.
Why the Bid-Ask Spread Matters
The spread is a direct cost to every trader. A 2% spread means a trader loses 2% immediately on a round-trip trade (buy then sell). For active traders making multiple trades daily, cumulative spread costs can significantly erode returns.
For token projects, tight spreads signal a healthy, liquid market. Investors and traders are more willing to enter positions when they know they can exit without losing several percent to spread costs. Market-making tools like OpenLiquid's CEX market maker help maintain competitive spreads on centralized exchanges.
Related Terms
Market Maker
An entity (human, firm, or bot) that provides continuous two-sided quotes on an exchange to ensure trade execution for others.
Read definition DEX & ExchangeOrder Book
A real-time list of outstanding buy and sell orders for an asset on an exchange, used by CEXs and some hybrid DEXs.
Read definitionFrequently Asked Questions
Common questions about Bid-Ask Spread in cryptocurrency and DeFi.
For major tokens on centralized exchanges, spreads under 0.1% are standard. For mid-cap tokens, 0.1% to 0.5% is healthy. For small-cap or newly listed tokens, anything under 2% is considered acceptable. Spreads above 5% typically indicate insufficient market making.
DEXs using AMMs do not have traditional order books, so there is no explicit bid-ask spread. Instead, the effective spread is determined by the price impact of trading — the difference between buy and sell execution prices for the same trade size. Deeper liquidity pools produce tighter effective spreads.
Market makers control the spreads they quote. On competitive markets with multiple market makers, spreads naturally tighten through competition. On tokens with a single market maker, that entity has more control over spread width, which is why projects benefit from multiple liquidity sources.
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