Solidity example of how to read USD price of ETH onchain using MakerDAO medianizer price feed contract

Example.sol

pragma solidity >=0.4.22 <0.6.0;

interface IMakerDaoMedianizer {
    function read() external view returns (bytes32);
}

contract Example {
    IMakerDaoMedianizer makerDaoMedianizer;
    
    constructor(address _makerDaoMedianizer) public {
        makerDaoMedianizer = IMakerDaoMedianizer(_makerDaoMedianizer);
    }
    
    function usdPrice() external view returns (bytes32) {
        return makerDaoMedianizer.read();
    }
}