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I'm hoping to build a system that would let me, in one transaction, transfer ETH from WalletA and receive DAI in Wallet B.

Is there a contract out there that currently does it? or is it even possible to build a contract that does this?

Keep in mind the toToken, fromToken, walletB addresses would all be parameters on a given function call.

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Yes, it's possible. You can directly interact with UniswapV3 or Sushiswap router contracts to swap ETH to DAI and send that to a particular receiver address.

Here's the example with Sushiswap (UniswapV2) router:

function-ss

  1. payableAmount: ETH amount you want to swap
  2. path: [WETH, DAI]
  3. to: walletB

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