Decentralized finance, commonly known as DeFi, allows cryptocurrency users to participate in financial activities without relying entirely on traditional financial institutions. One popular DeFi activity is providing liquidity to decentralized exchanges.
Liquidity providers deposit cryptocurrency into liquidity pools and can earn a share of trading fees. However, providing liquidity also comes with risks. One of the most important is impermanent loss.
Impermanent loss occurs when the value of assets deposited into a liquidity pool becomes lower than the value the investor would have had by simply holding those assets outside the pool, based on the same market prices.
Understanding this concept is essential before depositing cryptocurrency into a liquidity pool.
What Is Impermanent Loss?
Impermanent loss is the difference between the value of a liquidity provider’s pool position and the value of simply holding the same assets in a wallet.
It usually occurs when the relative prices of the assets in a liquidity pool change after the user deposits them.
For example, imagine you provide liquidity to an ETH-USDC pool.
You deposit:
- 1 ETH worth $2,000
- 2,000 USDC
Your total position is worth $4,000.
If the price of ETH later rises significantly, the automated market maker may adjust the amount of ETH and USDC held on your behalf.
You may end up with less ETH and more USDC than you originally deposited.
The resulting value may be lower than if you had simply held the original 1 ETH and 2,000 USDC.
That difference is known as impermanent loss.
Why Is It Called “Impermanent” Loss?
The term “impermanent” refers to the fact that the difference can potentially disappear if the relative prices of the assets return to their original ratio.
For example, if ETH rises significantly after you provide liquidity but later returns to its original price relative to USDC, the impermanent loss may decrease or disappear.
However, if you withdraw your liquidity while the price relationship remains different, the loss becomes effectively realized compared with the simple holding strategy.
Therefore, “impermanent” does not mean that the loss will always disappear.
How Do Liquidity Pools Work?
To understand impermanent loss, it helps to understand how liquidity pools work.
A decentralized exchange can use an automated market maker (AMM) instead of a traditional order book.
The AMM uses a pool containing cryptocurrency assets.
For example, an ETH-USDC liquidity pool may contain both ETH and USDC.
Liquidity providers deposit assets into the pool and receive a share of the pool’s trading fees, depending on the protocol.
When traders buy or sell assets against the pool, the balance between the assets changes.
These changes can create impermanent loss for liquidity providers.
Why Does Impermanent Loss Happen?
Suppose an ETH-USDC pool initially has ETH priced at $2,000.
A large number of traders begin buying ETH from the pool because the market price of ETH is increasing.
As ETH is purchased, the pool’s ETH balance decreases while its USDC balance increases.
The AMM adjusts the asset ratio based on its pricing mechanism.
If ETH’s external market price eventually reaches $4,000, the composition of the liquidity pool will be different from when the liquidity provider initially deposited the assets.
The liquidity provider may therefore have a different portfolio compared with simply holding the original assets.
Price Divergence Is the Key Factor
Impermanent loss becomes more significant when the relative prices of the assets move apart.
Consider two broad situations.
Similar Price Movement
If two assets move in a similar direction and at a similar rate, their relative price may not change substantially.
This can result in relatively lower impermanent loss.
Significant Price Divergence
If one asset rises dramatically while the other remains stable or declines, the price ratio changes significantly.
This can result in greater impermanent loss.
This is why pools containing a volatile cryptocurrency and a stablecoin can experience significant impermanent loss when the cryptocurrency’s price moves sharply.
A Simple Example of Impermanent Loss
Suppose you deposit equal values of ETH and USDC into a liquidity pool.
Initially:
- 1 ETH = $2,000
- 2,000 USDC
- Total = $4,000
Later, ETH rises to $4,000.
The liquidity pool automatically adjusts its asset ratio as traders interact with it.
Because the pool now contains proportionally more USDC and less ETH than your original deposit, your position may be worth less than simply holding:
- 1 ETH
- 2,000 USDC
The difference between these two outcomes represents the impermanent loss.
The exact percentage depends on the price change and the specific AMM model.
Approximate Impermanent Loss Levels
For a basic constant-product liquidity pool, simplified examples are often presented like this:
| Change in Relative Price | Approximate Impermanent Loss |
| 1.25× | 0.6% |
| 1.50× | 2.0% |
| 2× | 5.7% |
| 3× | 13.4% |
| 4× | 20.0% |
| 5× | 25.5% |
These figures are simplified and represent the difference compared with holding the assets, before considering trading fees, rewards, gas costs or other factors.
The actual outcome can vary depending on the liquidity pool and protocol.
Do Liquidity Providers Lose Money?
Not necessarily. This distinction is important.
Impermanent loss measures underperformance compared with simply holding the assets.
A liquidity provider could still have a profitable position after receiving trading fees and other rewards.
For example, suppose impermanent loss reduces the relative return by $100 but the liquidity provider earns $250 in trading fees.
The overall position could still be profitable.
However, if fees and rewards are smaller than the impermanent loss and other costs, providing liquidity may underperform holding the assets directly.
Can Trading Fees Offset Impermanent Loss?
Yes, trading fees can potentially offset some or all of the impermanent loss.
Liquidity providers typically receive a portion of trading fees generated by the pool.
The amount earned depends on factors such as:
- Trading volume
- Liquidity pool size
- Fee rate
- Provider’s share of the pool
- Time spent providing liquidity
A high-volume pool may generate substantial fees, but high trading activity can also accompany significant price movements.
Therefore, investors should consider both fee income and impermanent loss.
Stablecoin Liquidity Pools
Liquidity pools containing stablecoins can potentially experience less impermanent loss when the assets maintain similar prices.
For example, two stablecoins designed to track the same currency may normally have relatively little price divergence.
However, stablecoin pools are not risk-free.
A stablecoin can lose its intended peg, which can significantly change the relative price between the assets.
Liquidity providers should therefore consider depegging risk as well as impermanent loss.
How Can Investors Reduce Impermanent Loss?
Impermanent loss cannot always be completely avoided when providing liquidity, but investors can consider several strategies.
Choose Correlated Assets
Pairs whose prices tend to move together can potentially experience less price divergence.
Consider Stablecoin Pools
Stablecoin pairs may have lower relative price volatility under normal market conditions.
Evaluate Trading Fees
Higher trading volume and reasonable fee rates can potentially generate more income to offset impermanent loss.
Understand the AMM Model
Different decentralized exchanges use different liquidity mechanisms.
Investors should understand how the specific pool calculates prices and manages liquidity.
Monitor Volatility
Highly volatile asset pairs may create greater potential impermanent loss.
Impermanent Loss Is Not the Only DeFi Risk
Liquidity providers should consider several other risks before depositing funds.
These include:
- Smart contract vulnerabilities
- Protocol exploits
- Stablecoin depegging
- Cryptocurrency price volatility
- Low liquidity
- Network fees
- Oracle-related risks
- Governance risks
- Token reward changes
A liquidity pool offering a high advertised yield is not necessarily a low-risk investment.
Why APY Alone Can Be Misleading
Some DeFi platforms display attractive annual percentage yields (APYs) to encourage users to provide liquidity.
However, the displayed yield may not account for the potential impact of impermanent loss.
For example, a pool could offer a 20% annualized reward rate, but a major price divergence between the two assets could result in a significant impermanent loss.
Therefore, investors should not evaluate liquidity pools based solely on their advertised APY.
Instead, they should consider:
Trading fees + rewards − impermanent loss − transaction costs − other risks
This provides a more complete way to think about potential returns.
Final Thoughts
Impermanent loss is an important risk associated with providing cryptocurrency liquidity. It occurs when the relative prices of assets in a liquidity pool change, causing the liquidity provider’s position to perform differently from simply holding the same assets.
The larger the price divergence between the paired assets, the greater the potential impermanent loss can become.
However, impermanent loss does not automatically mean that a liquidity provider loses money. Trading fees and other rewards can potentially compensate for the loss and may result in an overall profitable position.
Before providing liquidity, investors should understand the pool’s asset pair, AMM mechanism, trading volume, fee structure, volatility and smart contract risks.
Most importantly, a high APY does not automatically mean high returns. Liquidity providers should compare potential fee income and rewards with impermanent loss and other risks before committing cryptocurrency to a DeFi liquidity pool.
