Overview
Impermanent loss occurs when the value of tokens in a liquidity pool changes compared to holding them outside the pool, leading to a temporary loss in dollar value. It is the risk that liquidity providers bear in exchange for trading fees, and it becomes permanent if the price ratio shifts and the provider withdraws at the new prices. It is a defining cost of automated market maker liquidity provision.
How It Works
When a provider deposits two assets in a pool, the pool maintains a constant product. If the price of one asset rises relative to the other, arbitrageurs trade against the pool, shifting its composition so that the provider holds more of the depreciated asset. Compared with simply holding both assets, the pool position is worth less; this difference is the impermanent loss. The loss is called impermanent because it shrinks if prices return to the deposit ratio, but it crystallizes on withdrawal.
Why It Matters
Impermanent loss can exceed the fees earned from a pool, especially for volatile pairs, making some positions net negative despite active trading. Stablecoin pairs minimize it, while volatile asset pairs maximize it. Providers can mitigate it by choosing correlated assets, farming rewards, or using protocols with loss-protection mechanisms, but no pool fully eliminates the risk.
Related Concepts
Impermanent loss is the central trade-off of Liquidity Pools and AMMs. It interacts with Yield Farming rewards, which can offset or outweigh the loss, and is a key reason stablecoin and correlated-asset pools dominate high-TVL pairs.