3.Live_price_feeds.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.8;

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

  function description() external view returns (string memory);

  function version() external view returns (uint256);

  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}
contract FundMe{
    uint256 public number;
    function fund() public payable{
        number = 5;

        require(msg.value > 1e18,"not enough");
    }

    function getPrice() public view returns(int256){
        AggregatorV3Interface priceFeed = AggregatorV3Interface(0xD4a33860578De61DBAbDc8BFdb98FD742fA7028e);
        (,int256 price,,,)= priceFeed.latestRoundData();
        return price;
    }
}