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I'm trying to redeem my LP tokens with ethersJS and Uniswap's Router02 contract. How do I calculate the arguments amountAMin and amountAMin for the function linked below?

https://uniswap.org/docs/v2/smart-contracts/router02/#removeliquidity

2 Answers 2

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The amountAMin is parameter is present to prevent a sandwich attack on your transaction.

Lets say that, you have 1 share to a uniswap v2 pair which gives 1.1 ETH and 2200 DAI.

If you pass a value for e.g. 1 ETH to the amountAMin when calling remove liquidity, then the Router contract will make sure that ETH sent to you is >= 1 ETH. And if there is a sandwich attack that changes price of ETH such that you now get only 0.9 ETH, then for safety the Router contract will purposely revert the transaction.

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You need token balances and total supply of the liquidity pair, let's me share - example gist

It uses real token addresses from Cronos mainnet.

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