Cost Based Restriction in Smart Contract Solidity

Here we apply cost based restriction, in which sender can’t able to send ethers less than cost defined my contract Owner.

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

contract costBaseRistriction{

    modifier cost(uint _amount){
        if(msg.value < _amount)
            revert("Enough Ether");
        
        _;
        
        if(msg.value > _amount)
            payable(msg.sender).transfer(msg.value - _amount);
    }
    
    //this method to able called after 2 minute 
    function call1() public payable cost(1 ether){
        
    }
    //this method to able called after 3 minute
    function call2()public payable cost(2 ether){
        
    }
    
    function getBalance()public view returns(uint){
        return address(this).balance;
    } 
}

By Shabair

Frontend | Blockchain | Smart Contract Developer