Slippage is the difference between the price you expect when placing a crypto trade and the price you actually receive when the order executes. It is often described as the “cost of immediacy,” because executing instantly can mean accepting a worse price if the market moves or available liquidity is limited. Slippage can be negative, you receive a less favorable price, or positive, you get filled at a better price than expected.
Why slippage happens in crypto
Crypto markets can change quickly, especially around major news, liquidations, or sudden order flow. On centralized exchanges (CEXs), slippage commonly occurs when you submit a market order that consumes multiple price levels in the order book, which is typical for large orders or thinly traded pairs. Latency also matters, prices can move between the moment you click “buy” and when the exchange matches your order.
On decentralized exchanges (DEXs), slippage is closely tied to how automated market makers price swaps. If a liquidity pool is small or your trade is large relative to the pool, the swap pushes the pool price along its curve, so the execution price worsens as you take more liquidity. Network congestion can amplify this because the transaction may confirm after the market has already shifted.
Slippage settings, risk, and practical examples
Many DEX interfaces let users set a slippage tolerance, a maximum allowed price deviation before the swap fails. For example, if you set a tight tolerance and the price moves beyond it before confirmation, the transaction may revert, costing time and possibly network fees. If you set tolerance too high, you may be exposed to unfavorable execution, including opportunistic trading in volatile conditions.
Understanding slippage matters because it affects real trading costs, execution reliability, and strategy performance across both CEX and DEX markets.