In a V2 pool, a 2× rise in ETH’s market price can leave an LP holding about 0.707 ETH and 2,828 USDC for each original 1 ETH and 2,000 USDC, before fees. If you need the broader choice first, how BaseSwap swaps compare with pool liquidity explains which activity fits your goal; here, the focus is how a pool position changes as prices move.
What happens to my tokens when the pool price moves?
In a V2 pool, trades change the reserve ratio, so your share of the pool changes from holding a fixed pair of token amounts to holding a moving mix. The pool follows the constant-product relationship x × y = k: x and y are the two token reserves, and k is their product.
Suppose a pool starts with 1 ETH and 2,000 USDC, so its implied price is 2,000 USDC per ETH. If the outside market price rises to 4,000 USDC, traders can buy ETH from the pool until its price catches up. In the simplified model, the reserves settle near 0.707 ETH and 2,828 USDC: their product is still about 2,000, and their ratio now reflects the new price.
If you own 1% of the pool, you own about 1% of those updated reserves. The exact amounts depend on pool activity and your share; they are not a promise that you can withdraw the original pair unchanged. Uniswap’s V2 documentation describes the reserve formula and proportional pool ownership used in this example.
Why might my position be worth less than holding?
When one token rises or falls relative to the other, the pool trades some of the rising token away and accumulates more of the falling one. Your position may therefore be worth less than simply keeping the original tokens outside the pool. This difference is commonly called impermanent loss; it describes a comparison, not a separate amount deducted from your wallet.
In the example, the updated reserves are worth about $5,657 at 4,000 USDC per ETH: 0.707 × 4,000 plus 2,828. Holding the original 1 ETH and 2,000 USDC would be worth $6,000. The pool position trails by roughly $343, or 5.7%, before fees and transaction costs. If the relative price later returns to its starting point, that gap can shrink; if you withdraw while prices remain changed, the difference is realized in the value of the tokens you receive.
Fees from swaps may offset some of that gap, but they are not guaranteed profit. The result depends on how far the relative price moves, how long it stays changed, and the trading fees your share receives. The Uniswap V2 whitepaper describes the constant-product mechanism behind this rebalancing.
What should I check before adding or removing liquidity?
Use the pool’s current reserve ratio to estimate the token mix you would contribute and the share you would own. For example, if an existing pool holds 10 ETH and 20,000 USDC, its reserve ratio is 2,000 USDC per ETH; a proportional addition of 0.1 ETH would pair with about 200 USDC. A deposit far from that ratio may be only partly used or may shift the pool’s price, depending on the pool’s rules.
Before adding liquidity through BaseSwap, decide whether you are comfortable ending up with a different mix of assets and compare that outcome with simply holding them. Before withdrawing, estimate the value of the pool share at current prices rather than expecting the original amounts back. Check the pool and token identities carefully, since similarly named tokens can be different assets, and remember that adding or removing liquidity requires onchain transactions and network gas.