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I am trying to build a smart contract which performs a multihop swap using Uniswap V3 but wherever I have seen the tutorial, amountOutMinimum is set to 0.

In Uniswap V2 there are several ways to estimate amountOutMinimum, but I am not finding any way to find it using Uniswap V3. Even in single hop swaps it can be done but how can we do it in multi hop swaps?

2 Answers 2

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Getting a quote within a transaction is a good way to lose money, and best to not do as a bot can frontrun the transaction by manipulating the prices...

you would really want to build this of chain and pass it to your contract

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You are looking for the function quoteExactInput from uniswap's quoter contract. It allows getting the expected amount out for a given swap without executing the swap. For a single swap, use quoteExactInputSingle

Find the deployed Quoter contract address here

Note, however, that unlike Uniswap V2, where the equivalent function getAmountsOut is a view function, the function in v3 is a non-view function and will incur the gas cost.

Also, do note that, the function is not meant to be called on-chain for the purpose of slippage control because performing a swap in the same transaction that this function is called in would provide no slippage protection. You may use this function off-chain to supply the estimates to a smart contract function.

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