What is impermanent loss?
Impermanent loss is the difference in value between providing two assets to a liquidity pool and simply holding those same assets in your wallet. It happens when the price ratio of the two assets changes after you deposit them. It's called "impermanent" because the loss only becomes real when you withdraw; if prices return to where they started, it disappears.
When you add liquidity to an automated market maker (AMM) like Uniswap, you deposit a pair of tokens (say ETH and USDC). As the market price of ETH moves, arbitrage traders rebalance the pool to match the outside market. That rebalancing leaves you holding more of the asset that fell and less of the asset that rose, so your position is worth less than if you'd just held both tokens untouched.
Why it happens
- A pool always keeps your two assets in a set ratio (often 50/50 by value).
- When one asset's price changes, traders buy or sell against the pool until its price matches the wider market.
- That process sells you out of the winner and into the loser, mechanically.
- The bigger the price divergence between the two assets, the larger the impermanent loss.
How to think about the trade-off
Liquidity providers earn trading fees (and sometimes incentives) in exchange for taking on impermanent loss. The position is profitable when fee income exceeds the impermanent loss over the time you're in the pool. A few practical levers:
- Correlated or stable pairs (ex: two stablecoins, or ETH/stETH) diverge less, so impermanent loss is smaller.
- Higher-fee, high-volume pools generate more fees to offset the loss.
- Volatile pairs can earn big fees but also carry the most impermanent loss risk.
This is educational information, not financial advice. Providing liquidity carries smart-contract and market risk, and you can lose money.
Frequently asked questions
Is impermanent loss a real loss?
It only becomes a realized loss when you withdraw your liquidity while the price ratio is different from when you deposited. If prices return to the original ratio, the impermanent loss goes away.
How do I reduce impermanent loss?
Provide liquidity for correlated or stablecoin pairs that don't diverge much in price, choose pools where trading fees are high enough to offset the loss, and avoid highly volatile pairs if you're sensitive to it.
Do I still earn anything as a liquidity provider?
Yes. Liquidity providers earn a share of trading fees (and sometimes extra incentives). The position is net-positive when those fees outweigh the impermanent loss over your holding period.