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);