I set Nethermind to zero gas price:
"Blocks": {
"MinGasPrice": 0
},
Nevertheless, MetaMask for this network shows rather big positive gas prices and does not allow to set the gas price to 0 (or about zero).
Why can't I set the gas price in MetaMask to zero? Is it possible to implement private network with zero gas price and use MetaMask without gas?
Once (apparently, as a result of a MetaMask bug) the gas price were set to zero. Then the transaction didn't validate.