someone knows how to spot sales on uniswap in a contract (if the transfer function is used to sell on uniswap)

Monitor the events within the transaction

How i can do that

@solidity101

Simplest approach would be to monitor the swap event emitting from

emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);


And filter it for to/from contract address

Check how to monitor events in web3js or etherjs

But i want to check on every tx in solidity

In solidity it's not possible to monitor transactions

but I can't just look at the "to" of the transfer and see if it's uniswap?