Spread and price slippage: critical factors of the real cost of trading

Key Principles

When you perform operations on a cryptocurrency exchange, it is important to understand that the final price of your trade depends not only on the established rate. Two mechanisms—the spread between buyers' and sellers' offers, as well as a phenomenon known as slippage—can significantly affect your costs.

The spread is the difference in prices set by buyers and sellers in the order book. When you want to make an immediate buy or sell, you will have to agree to the terms offered by the opposing party — usually this is an unfavorable price for you.

Slippage occurs when the size of your order exceeds the available volume at the desired price, and the system is forced to fill your order at sequentially increasing ( or decreasing ) prices. The result is that you receive execution at a completely different rate than you expected.

Markets with narrow spreads and minimal slippage signal healthy and active trading. In contrast, when the spread is wide, it is a sign of low liquidity and increased risk for traders.

How the pricing system works on the exchange

On cryptocurrency exchanges, the price of an asset constantly fluctuates based on the balance of supply and demand. Each market participant pursues their own benefit: buyers want to buy cheaper, sellers want to sell at a higher price.

This natural struggle of interests creates a spread phenomenon, where a gap forms between the maximum bid price and the minimum selling price. If you initiate an instant purchase, you are forced to accept the lowest offer from the seller. When selling, you take the highest price from the buyer.

Trading volume directly affects the size of the spread. Assets with high trading activity (such as Bitcoin or Ethereum) have narrow spreads due to the large number of participants willing to execute orders. Low-traded coins face wide spreads — there are simply fewer opposing orders in the book.

The Role of Market Makers in Price Formation

In traditional financial markets, liquidity is provided by specialized companies — market makers. In the cryptocurrency ecosystem, this process is different: liquidity is created by the traders themselves through limit orders.

However, the principle remains the same. Any participant willing to buy and simultaneously sell the same asset effectively acts as a market maker. They can, for example, buy BNB for $800 and immediately list it for sale at $801, earning $1 in the difference. Even such a tiny margin yields profit in high-frequency trading.

When many participants compete for such earning opportunities, spreads inevitably narrow. Popular assets attract more market makers, leading to even tighter price gaps.

Market Depth Visualization

To see the spread in action, it is useful to refer to the exchange's tools. Many platforms offer a market depth display feature — a chart that shows all active buy and sell orders.

Typically, the chart is represented by two curves: the red line (sell orders) and the green (buy orders). The gap between them is the spread. The closer the curves are to each other, the narrower the spread, and the greater the liquidity in the market.

For assets with good liquidity, the charts almost converge, showing the readiness of many participants to execute your order. For rarely traded assets, the curves are positioned far apart, signaling the danger of slippage.

Calculation of the Percentage Value of the Spread

A percentage metric is used to compare the spreads of different assets. The formula is simple:

(Offer Price - Bid Price) / Offer Price × 100 = Spread Percentage

Let's take a specific example. Suppose the TRUMP coin is trading with a bid price of $9.43 and an ask price of $9.44. The difference is $0.01. We divide by $9.44 and multiply by one hundred: we get approximately 0.106% spread.

Now let's compare it with Bitcoin. If the spread is $1 at a price of about $118,500, then the percentage of the spread will be only 0.000844%. Although the absolute value of the spread is larger, in percentage terms, Bitcoin has a much better indicator due to the huge trading volumes.

This calculation is especially useful when working with low-cap assets. For example, TRUMP has a lower trading volume, which is reflected in a higher percentage spread. Assets with narrow spreads ( in percentage terms ) are usually more liquid and allow for large orders to be executed without significant cost increase.

What Happens During Slippage

Slippage occurs in situations where your market order cannot be executed at one price. Suppose you want to buy an asset at $100 by placing a large order. However, there is not enough volume at that price in the order book. The system starts looking for additional offers—first at $100.10, then at $100.20 and higher.

As a result, your purchase is executed at an average price that turns out to be higher than expected. This is called slippage. In volatile markets with low liquidity, slippage can be 10% or more from the initial price.

Slippage is a common occurrence on decentralized exchanges and in automated market makers. When you send an order to the blockchain, market conditions may change before the transaction is processed. Additionally, other traders may outbid you with a higher processing fee for (gas).

Positive Slippage and Methods for Its Minimization

Interestingly, slippage is not always unfavorable. Positive slippage occurs when the price moves in your favor. For example, if you place a buy order and the market prices drop, you may fill the order at a lower price than expected. Such situations are rare but can occur in highly volatile markets.

To counteract undesirable slippage, many platforms offer the option to set a permissible price deviation. This parameter informs the exchange of the maximum percentage change you are willing to accept. If the price deviates more than that, the order will not be executed.

However, a low tolerance level may result in your order not being executed at all. A high tolerance level risks leaving you vulnerable to front-running—when another participant or bot notices your order and completes their trade first, changing the price to their advantage.

Practical Recommendations for Traders

It is impossible to completely avoid slippage, but there are ways to reduce it:

Break large orders into parts. Instead of placing one large order, place several smaller ones. Before placing, check the order book and make sure that the volume of your order does not exceed the available amount at the current price level.

Consider processing fees. On decentralized platforms, gas fees can be significant. During times of high network activity, costs may completely offset profits from the transaction.

Avoid assets with low liquidity. If the liquidity pool is small, your trade can significantly shift the price. Choose markets with high volumes and numerous participants.

Use limit orders instead of market orders. A limit order is executed only at the specified price or better. You may wait longer, but you will avoid unpleasant surprises with slippage.

Final Thoughts

Trading cryptocurrency requires an understanding of hidden costs that are not reflected in explicit fees. The spread and slippage can significantly increase the true cost of your trade, especially when working with large volumes.

In small orders, these factors may go unnoticed, but for active traders, they are critical indicators. Understanding pricing mechanisms, choosing the right assets, and the correct position size are the keys to minimizing losses and enhancing trading efficiency. It is essential to constantly monitor market conditions and adapt your strategy to the current environment.