chainlink中获取btc价格示例

gistfile1.txt

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

/*
    Chainlink BTC/USD Price Feed
    Network: Sepolia
*/

interface AggregatorV3Interface {

    function decimals() external view returns (uint8);

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

    function version() external view returns (uint256);

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

contract BTCPriceFullData {

    AggregatorV3Interface internal dataFeed;

    constructor() {

        // BTC / USD feed on Sepolia
        dataFeed = AggregatorV3Interface(
            0x1b44F3514812d835EB1BDB0acB33d3fA3351Ee43
        );
    }

    /*
        获取基础信息
    */
    function getFeedInfo()
        public
        view
        returns (
            string memory description,
            uint8 decimals,
            uint256 version
        )
    {
        description = dataFeed.description();

        decimals = dataFeed.decimals();

        version = dataFeed.version();
    }

    /*
        获取完整价格数据
    */
    function getLatestRoundData()
        public
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        )
    {
        (
            roundId,
            answer,
            startedAt,
            updatedAt,
            answeredInRound
        ) = dataFeed.latestRoundData();
    }

    /*
        获取处理后的BTC价格
        去掉8位小数
    */
    function getReadablePrice()
        public
        view
        returns (int256)
    {
        (
            ,
            int256 answer,
            ,
            ,
            
        ) = dataFeed.latestRoundData();

        return answer / int256(10 ** uint256(dataFeed.decimals()));
    }
}