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I think there are a lot of websites out there (e.g. etherscan) that shows you the current fees

I've so much more to learn about crypto!

Posted Using LeoFinance Beta

I just did it by trial and error. If fees were high I would pass, but that rarely happened. Remember though, here I'm only referring to the actual fees and not the "commissions" (the spread) you pay to Uniswap.