Decentralized finance, commonly known as DeFi, allows cryptocurrency users to provide liquidity to decentralized exchanges and potentially earn trading fees. However, providing liquidity is not completely risk-free.
One important risk is known as impermanent loss.
Impermanent loss occurs when the value of assets held in a liquidity pool changes compared with simply holding those assets in a wallet. The greater the price difference between the assets when deposited and their later prices, the greater the potential impermanent loss can become.
Understanding this concept is important for anyone considering liquidity provision in decentralized finance.
What Is Impermanent Loss?
Impermanent loss is the potential loss in value that a liquidity provider experiences compared with simply holding the same assets outside the liquidity pool.
The term “impermanent” is used because the difference can decrease or disappear if the asset prices return to their original relative prices.
However, the loss can become effectively permanent if the liquidity provider withdraws the assets while the price difference remains.
Importantly, impermanent loss does not necessarily mean the investor has lost money in absolute terms. It means the investor may have earned less than they would have by simply holding the assets.
How Do Liquidity Pools Work?
To understand impermanent loss, it is helpful to understand liquidity pools.
A decentralized exchange can use a liquidity pool containing two or more cryptocurrency assets. Liquidity providers deposit assets into the pool so that other users can trade against that liquidity.
For example, a liquidity pool might contain:
- ETH
- USDC
A liquidity provider could deposit an equivalent value of both assets into the pool.
In return, the liquidity provider may receive a share of trading fees generated by the pool.
The exact design varies between decentralized exchanges and protocols.
A Simple Impermanent Loss Example
Imagine you deposit:
- 1 ETH worth $2,000
- $2,000 worth of USDC
Your total deposit is therefore worth $4,000.
Now suppose the price of ETH doubles to $4,000.
Because the liquidity pool’s pricing mechanism automatically adjusts the relative quantities of assets, your position may contain less ETH and more USDC than when you initially deposited.
The value of your liquidity position may therefore be different from the value you would have had by simply holding the original 1 ETH and $2,000 USDC.
This difference is the basic idea behind impermanent loss.
The exact outcome depends on the pool’s design, trading activity and asset prices.
Why Does Impermanent Loss Happen?
Impermanent loss occurs because automated market makers, or AMMs, adjust asset quantities as traders buy and sell against the liquidity pool.
Suppose traders purchase ETH from an ETH-USDC pool because ETH’s market price is increasing.
As ETH is purchased from the pool, the pool holds less ETH and more USDC.
This changes the composition of the liquidity provider’s position.
If ETH’s price moves significantly compared with USDC, the difference between holding the assets directly and providing them as liquidity can become larger.
Price Volatility Is a Major Factor
The greater the price movement between the paired assets, the greater the potential impermanent loss.
For example, if two assets maintain relatively similar prices or move together, impermanent loss may be relatively small.
But if one asset rises sharply while the other remains stable, the difference can become much larger.
This is why liquidity pools containing a volatile cryptocurrency and a stablecoin can experience significant impermanent loss during major market movements.
Stablecoin Pairs and Impermanent Loss
Liquidity pools containing two stablecoins can potentially have lower impermanent loss because their prices are designed to remain close to one another.
For example, a pool containing two stablecoins targeting the same fiat currency may experience less price divergence than a pool containing a volatile cryptocurrency and a stablecoin.
However, stablecoin pools are not completely risk-free.
Stablecoins can lose their intended peg, and liquidity pools also carry smart contract, protocol and other risks.
Impermanent Loss vs Permanent Loss
The word “impermanent” can sometimes be misunderstood.
Suppose the price ratio between two assets changes significantly after you provide liquidity. Your position may experience impermanent loss compared with simply holding the assets.
If the price ratio later returns to approximately its original level, the difference can potentially disappear.
However, if you withdraw your liquidity while the price ratio remains significantly different, the loss relative to holding can become realized.
Therefore, impermanent loss is not necessarily temporary in every practical situation.
Do Trading Fees Compensate for Impermanent Loss?
Liquidity providers generally receive a portion of trading fees generated by a pool.
These fees can help offset impermanent loss.
For example, a pool with significant trading activity may generate substantial fees for liquidity providers.
If the fees earned are greater than the value lost through impermanent loss and other costs, providing liquidity could still be profitable.
However, there is no guarantee.
A pool can generate attractive fees while the liquidity provider’s overall return remains lower than a simple buy-and-hold strategy.
How Is Impermanent Loss Calculated?
For a simple constant-product liquidity pool, a commonly used formula for impermanent loss depends on the ratio between the new asset price and the original price.
If the price ratio changes significantly, the percentage difference between providing liquidity and holding the assets can increase.
For example, approximate impermanent loss values are often illustrated as follows:
| Price Change | 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 examples for a basic two-asset constant-product model and do not include trading fees, rewards, gas costs or other factors.
How Can Liquidity Providers Reduce Impermanent Loss?
There is no guaranteed method for eliminating impermanent loss, but investors can consider several approaches.
Choose Less Volatile Asset Pairs
Assets that tend to move together may experience less divergence than highly unrelated assets.
Consider Stablecoin Pools
Stablecoin pairs may have lower price divergence under normal conditions, although they still carry other risks.
Compare Fees With Potential Loss
A pool offering higher trading fees may potentially compensate for impermanent loss more effectively than a low-volume pool.
Understand the Pool’s Design
Different decentralized exchanges use different AMMs and liquidity mechanisms. Investors should understand how the specific pool operates before depositing funds.
Monitor Asset Prices
Large changes in the relative price of paired assets can increase impermanent loss.
Impermanent Loss Is Not the Only Risk
Liquidity providers should consider more than just impermanent loss.
Other risks include:
- Smart contract vulnerabilities
- Protocol exploits
- Stablecoin depegging
- Low liquidity
- Cryptocurrency price volatility
- Network transaction fees
- Governance risks
- Token reward fluctuations
Therefore, a high advertised annual percentage yield (APY) should not automatically be interpreted as a low-risk opportunity.
Why Impermanent Loss Matters to DeFi Investors
Impermanent loss is important because liquidity provision can appear attractive when investors focus only on trading fees and token rewards.
For example, a liquidity pool might advertise an attractive yield. However, if one asset experiences a large price increase or decline, impermanent loss could significantly reduce the investor’s overall return.
The correct question is therefore not simply:
“How much yield can I earn?”
It is:
“How much can I potentially earn after considering impermanent loss and other risks?”
Final Thoughts
Impermanent loss is the difference between the value of assets held in a liquidity pool and what those assets might have been worth if they had simply been held outside the pool.
It generally occurs when the relative prices of the assets in a liquidity pool change. Greater price divergence can lead to greater impermanent loss.
Trading fees and liquidity rewards can help compensate for this loss, but they do not guarantee profitability.
Before becoming a liquidity provider, investors should understand the pool’s asset pair, pricing mechanism, expected fees, volatility and smart contract risks. Most importantly, they should compare the potential returns from liquidity provision with the alternative of simply holding the underlying assets.
For DeFi users, understanding impermanent loss is essential because earning trading fees does not automatically mean that providing liquidity will outperform holding cryptocurrency directly.
