AggregatorV2V3Interface

function latestAnswer() external view returns (int256);

function latestTimestamp() external view returns (uint256);

function latestRound() external view returns (uint256);

function getAnswer(uint256 roundId) external view returns (int256);

function getTimestamp(uint256 roundId) external view returns (uint256);

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);

event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 timestamp);

event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt);