// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.5.16;

interface FeedRegistryInterface {
    function decimals(address base, address quote) external view returns (uint8);

    function description(address base, address quote) external view returns (string memory);

    function version(address base, address quote) external view returns (uint256);

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

    function latestRoundData(address base, address quote)
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );

    function getFeed(address base, address quote) external view returns (address aggregator);

    function isFeedEnabled(address aggregator) external view returns (bool);
}