Recently, someone asked me about slippage, and I realized this is indeed a common issue that many beginners tend to overlook. If you trade frequently, slippage can directly impact your costs.

Simply put, slippage is the difference between the expected transaction price and the actual transaction price when you place an order. It’s especially likely to occur with market orders because of high market volatility or low liquidity, meaning your order can't be filled at your ideal price. Sometimes, a few points of difference can accumulate and significantly affect your profits.

My own experience is that the concept of bid-ask spread is very important. The difference between the buying price and the selling price varies with market liquidity and trading volume. Generally, large-cap trading pairs like BTC, ETH, and SOL have good liquidity, resulting in relatively small slippage; but some smaller coins or less common trading pairs tend to have noticeable slippage.

For example, if you want to buy an asset for $100, but due to insufficient market liquidity, your order ends up being filled at $110, that $10 difference is the slippage. It may not seem like much, but if you trade like this often, the losses can add up.

How to reduce slippage? I’ve summarized a few practical methods. First, split large orders into smaller ones to reduce market impact. Second, set a slippage tolerance—many decentralized exchanges support this feature, allowing you to set a limit of 0.5% or 0.1%. Third, pay attention to liquidity; the better the liquidity, the lower the slippage risk. Fourth, use limit orders, which may be slower to execute but ensure you buy or sell at a specific price or better, helping to avoid negative slippage as much as possible.

Interestingly, slippage isn’t always negative. If the price moves in your favor after you place an order, you get positive slippage, meaning you profit from it.

However, it’s important to balance the slippage tolerance setting. Setting it too low can cause orders to be delayed or fail; setting it too high might expose you to unexpected price swings. So, always think carefully about the acceptable slippage range before trading. These concepts may seem simple, but truly understanding and applying them in actual trading can be very helpful in reducing costs and risks.