Impermanent Loss

You deposit two tokens into a liquidity pool and come back later to find less value than if you'd just held them in your wallet. That gap is impermanent loss — and it has nothing to do with the pool losing money. It's a math problem that kicks in the moment prices move.

Liquidity providers earn fees, but they also take on price exposure in both directions. If you deposited ETH and USDC when ETH was $2,000, and ETH climbs to $3,000, the pool's automated rebalancing has been selling your ETH the whole way up. You end up with less ETH than you started with — and less total value than a simple hold would have produced.

How It Works

Automated market makers like Uniswap use a constant-product formula (x × y = k) to keep pool ratios balanced. When one token's price rises, arbitrageurs buy it from the pool until the ratio reflects the new market price. That process mechanically drains the appreciating asset from your position.

Here's a concrete snapshot: deposit 1 ETH and $2,000 USDC when ETH = $2,000. ETH doubles to $4,000. The pool rebalances, and your share is now worth roughly $5,657 — but holding those same assets would have returned $6,000. The $343 gap is impermanent loss: about 5.7% of what you would have had.

The "impermanent" label means it reverses if prices return to your entry ratio. But prices rarely cooperate on your schedule. If you withdraw while the ratio is off, the loss becomes permanent — locked in the moment you exit.

Why It Matters

For crypto lenders and borrowers, the stakes are specific. Some platforms accept LP tokens — your proof of pool ownership — as collateral. The loan-to-value ratio on that collateral is calculated against the LP token's current value, which already bakes in impermanent loss. A sharp price move can erode your collateral value faster than you expect, pushing you toward a liquidation threshold you thought you had headroom on.

Fee income can offset impermanent loss, but only if volume is high enough and the price divergence is small enough. Stable pairs — USDC/DAI, for example — see minimal impermanent loss because prices barely move relative to each other. Volatile pairs are a different story.

What to Watch

The most common mistake is netting fee APY against impermanent loss as if they cancel cleanly. They don't. Fees accrue gradually; impermanent loss can spike in minutes during a volatile market. If you're using LP tokens as collateral, monitor your position's health factor — not just the yield number you signed up for.