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Given a transaction on Uniswap,

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how to find out what pair is being swapped, and the amount of it? Namely, via web3.js/ethers.js

Is there relevant and sufficient information in the fields of a transction? Or will one have to make additional calls?

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You need to decode the transaction input using UniswapV2Router abi. Look at this part of ethers' documentation: https://docs.ethers.io/v5/api/utils/abi/interface/. Especially at the parseTransaction method.

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