Impermanent loss (IL) is the temporary drop in value that can happen when someone provides liquidity to a decentralized exchange (DEX), a blockchain platform where people trade cryptocurrencies directly with one another. Liquidity provision is like stocking a shared crypto wallet with equal amounts of two tokens. Traders can instantly swap one token for the other, while the liquidity provider (LP) earns a small fee each time someone trades.  

In essence, impermanent loss is the negative risk that LPs have to take in exchange for the trading fees they receive from these pools. Understanding this concept is important to anyone involved in decentralized finance. In the broader crypto space, it highlights how DEXes work, how users participate in them, and why it’s important to know the risks before adding crypto to a liquidity pool. 

How impermanent loss works

Impermanent loss occurs when a trader deposits crypto into a trading pool and the asset’s price changes compared to when it was first deposited. This can happen during periods of high volatility, when cryptocurrency prices fluctuate. 

To understand this, let’s look at an ideal real-world scenario. 

Imagine a trader deposits 1 Ether (ETH) worth $2,000 and 2,000 USDC (USDC), valued at $2,000, into a trading pool like Uniswap, a decentralized exchange that functions as a collection of liquidity pools. This totals exactly $4,000. 

After the deposit, ETH’s market value doubles to $4,000, while USDC remains at $1. But the pool doesn’t realize this right away. Inside the pool, ETH is still priced too low.

Traders notice this and to buy ETH, they pay with USDC. This means some of the ETH is sold and replaced with USDC, which causes USDC to flow into the pool and ETH to flow out. As the pool’s ETH balance decreases and its USDC balance increases, the pool’s pricing formula automatically raises ETH’s price. This process continues until the pool’s ETH price matches the $4,000 market price.

If the investor had simply held the assets outside the pool, the value after ETH doubled would be 1 ETH × $4,000 (current market price) + 2,000 USDC = $6,000.

Inside the liquidity pool, however, the position is now rebalanced as ETH’s price rises. In a Uniswap-style pool, when the price of one asset doubles, the total value of the position becomes the original value multiplied by √2. Starting from $4,000, the new pool value is $4,000 × √2 = $5,656.

The pool always keeps the value split evenly between the two assets. Half of $5,656 is $2,828 in ETH and $2,828 in USDC. At the new ETH price of $4,000, the ETH portion equals $2,828 ÷ $4,000 = 0.707 ETH, while the USDC portion remains 2,828 USDC.

So the investor’s impermanent loss is the difference between holding the assets and providing liquidity. Holding would be worth $6,000 at prevailing market prices, while the liquidity pool position is worth $5,656. This results in an impermanent loss of $344, or about 5.7% ($344÷$6,000) compared to simply holding the tokens.

Challenges concerning impermanent loss

Impermanent loss can reduce a significant portion of a LP potential profits. Although LPs are rewarded with trading fees from the pool, which can help offset IL, it is still crucial to understand the associated risks and challenges, including;

• Investors can earn less than they would by simply holding in a crypto wallet. 
• Impermanent loss is difficult to predict because it depends on price movements and volatility. 
• Pools that pair a volatile asset like ETH with a smaller altcoin are more likely to experience impermanent loss.
• If investors withdraw funds (i.e., liquidity) when a price difference exists in the pool, the loss can become permanent.
• Estimating IL requires understanding pool ratios, token prices, and market movements, which can be confusing for new users.  

How to avoid impermanent loss 

Impermanent loss cannot always be completely avoided, but liquidity providers can reduce its impact by using a few careful strategies:

• Use stablecoin pools: Traders can reduce the risk of Impermanent loss by providing liquidity with stablecoins like USDC or DAI. 
• Choose low-volatility pairs: Selecting cryptocurrencies with similar price behavior can also help avoid IL. An example is the ETH/stETH pair. 
• Focus on high-fee pools: Higher trading fees can help offset any potential losses.
• Diversify across pools:  Spreading liquidity across multiple pools reduces exposure to any single price movement.
• Use impermanent loss protection tools: Some DEX’s offer IL insurance to limit losses.
• Stay updated and monitor market trends: Closely watch price movements and volatility to help avoid large losses.  

When is impermanent loss ‘worth it’? 

Impermanent loss is a trade-off liquidity providers accept in exchange for earning trading fees. In pools with high trading activity, fee income can exceed the losses caused by price movements. 

In such cases, impermanent loss may be worth it for traders who can tolerate short-term volatility in return for steady fee earnings.

Impermanent Loss FAQs

How bad is impermanent loss? 

In extreme cases, impermanent loss can wipe out gains entirely when the market moves sharply, and trading fees cannot offset the loss. 

How to fix impermanent loss?

Stablecoin pairs can reduce or eliminate the risk of impermanent loss because they have a fixed ratio and are designed to maintain equal value. 

Why is it called impermanent loss?

It’s called impermanent loss because the loss is only temporary while prices differ, and it disappears if the token prices return to their original ratio before liquidity is withdrawn.