I would like to swap GNT to GLM. I've read the manual, but... when I want to swap, the metamask calculate the transaction fee to $270!
What is going on? How to make the swap and pay normal fee? The gas limit need to be set as high as 750000 fot that convert transaction?
The Gas Limit doesn't need to be that high, you'll end up spending around 90-110k of that. You can set the Gas Limit low if you want although with Gas Limit you'll only spend what you use so the transaction fee after the transaction goes through successfully will end up being the same. It's only the estimated fees that your wallet shows you that will change.