And miners also don't charge any fees because you pay those to compete with the others that want your block space, let's not get into this debate
What debate?
It's irrelevant for me for what you pay the fee, just as it's irrelevant how the VAT I pay at the kiosk is used.
OP you need a wallet that does charge you any fee? You want to be able send Xamount of crypto and receive exactly the Xamount of money in your receiving wallet?
I need a multicoin wallet with a swap feature.
So if I don't have enough to pay for gas fees I woundn't have to deposit ETH again with $1000 worth of BTC already in that wallet, I could just exchange a bit of that for the fees, same when paying with BTC for example and I'm missing 5600 satoshis to bump the fees up, I already have $100 USDT there so let me easily convert those.
If no such web wallet wallet exist then what's the cheapest exchange for micro transactions?