What is mint rate in ERC721A?

Question

What is mintRate here ?

contract Contract721A is ERC721A, Ownable {
      uint256 public mintRate = 0.001 ether; 
    
        function setMintRate(uint256 _mintRate) public onlyOwner {
            mintRate = _mintRate;
        }
    }

Reference : https://etherscan.io/address/0xd4299e6df45a393dc3104d02bb92dcd984f0f40f#code#F1#L29

Answer 1

mintRate is just the price(ETH value) of one NFT on the current ERC721A contract

Look the below code snippet
Users can't mint any NFT when they don't pay more than or equal to ETH value of mintRate * quantity

uint256 public mintRate = 0.0069 ether;

function mint(uint256 quantity) external payable {
   require(msg.value >= (mintRate * quantity), "Not enough ether sent");
   _safeMint(msg.sender, quantity);
}

Answer 2

The value of mintRate is 0.001 ether, or 1000000000000000 wei. It can be changed by reassigning through _mintRate.