removeLiquidityETHSupportingFeeOnTransferToken

[Aruninnblockchain]

Why we need removeLiquidityETHSupportingFeeOnTransferToken function?

How it works? I couldn't found an exact answer in many forums. As a Developer when should i call removeLiquidtyETH( ) and removeLiquidityETHSupportingFeeOnTransferToken( ) function? If you provide exact answer, this would be helpful for many people. Most of the people are searching answer for the above one.

[Kingtsu3288]

Why we need removeLiquidityETHSupportingFeeOnTransferToken function?

How it works? I couldn't found an exact answer in many forums. As a Developer when should i call removeLiquidtyETH( ) and removeLiquidityETHSupportingFeeOnTransferToken( ) function? If you provide exact answer, this would be helpful for many people. Most of the people are searching answer for the above one.

• @jab416171

[VeronikaSemykopna]

🦁

[sambacha]

Why we need removeLiquidityETHSupportingFeeOnTransferToken function?

How it works? I couldn't found an exact answer in many forums. As a Developer when should i call removeLiquidtyETH( ) and removeLiquidityETHSupportingFeeOnTransferToken( ) function? If you provide exact answer, this would be helpful for many people. Most of the people are searching answer for the above one.

There is an entire section in the audit reports discussing this https://uniswap.org/audit.html#orgd15839d

Router: incompatible with token with fees on transfer
The user facing contract UniswapV2Router01.sol calculates the amount a user needs to transfer to UniswapV2Pair.sol in order to perform a mint, swap or burn.

In cases dealing with a token which subtracts a fee on transferFrom, the amount received by UniswapV2Pair is smaller than the required amount to perform a successful swap, causing the whole call to fail when the fee adjusted invariant is checked at the end of swap.

This is only a problem with the router, and additional routers or token wrappers can be used to mitigate this issue.