Price Impact
The percentage change in a token's price caused by executing a trade against a liquidity pool; larger trades cause greater impact.
Price Impact — Price impact is the change in a token's market price caused by executing a trade against a liquidity pool. Larger trades relative to the pool's reserves create greater price impact, meaning the trader receives a worse average price than the displayed spot price.
What Is Price Impact?
Price impact measures how much a trade moves the pool's price. In an AMM, every swap changes the ratio of tokens in the pool, which shifts the price along the bonding curve. A small swap in a deep pool moves the price minimally, while a large swap in a shallow pool can shift it significantly.
Price impact is displayed as a percentage on DEX interfaces — for example, a 2% price impact means the trader's average execution price is 2% worse than the current spot price.
How Price Impact Works
In a constant-product AMM (x * y = k), buying token X removes it from the pool and adds token Y. As X becomes scarcer in the pool, each additional unit costs more. The total price impact depends on the trade size relative to the pool's reserves. A $10,000 swap in a $10 million pool has roughly 0.1% impact; the same swap in a $100,000 pool could have 10% impact.
Concentrated liquidity DEXs reduce price impact by focusing reserves around the active price, but the same principle applies at the edges of the concentrated range.
Why Price Impact Matters
High price impact directly reduces the value a trader receives. For large trades, price impact can exceed the swap fee as the primary cost. Understanding price impact helps traders choose appropriately sized positions and select pools with sufficient liquidity depth.
Related Terms
Slippage
The difference between the expected price of a trade and the actual execution price, caused by price movement or low liquidity.
Read definition DeFi & AMMLiquidity Pool
A smart contract holding two or more tokens that traders swap against, funded by liquidity providers who earn fees.
Read definition Volume Bot & Market MakingLiquidity Depth
The amount of available buy and sell orders within a given price range; deeper liquidity means less slippage on large trades.
Read definition DeFi & AMMConstant Product Formula (x*y=k)
The mathematical formula used by Uniswap v2-style AMMs where the product of two token reserves must remain constant after every trade.
Read definitionFrequently Asked Questions
Common questions about Price Impact in cryptocurrency and DeFi.
For most trades, price impact under 1% is considered acceptable. Impact above 3% warrants splitting the trade or using an aggregator. Impact above 10% signals dangerously thin liquidity.
No. Price impact is the deterministic price change from your trade size. Slippage is the difference between the quoted price and the actual execution price, which can include price impact plus any price movement between quote and execution.
Use a DEX aggregator to split across pools, break large trades into smaller ones, trade in pools with deeper liquidity, or use limit orders on DEXs that support them.
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