HistoricalPriceConsumerV3

HistoricalPriceConsumerV3.sol

// This example code is designed to quickly deploy an example contract using Remix.

pragma solidity ^0.6.7;

import "https://github.com/smartcontractkit/chainlink/blob/master/evm-contracts/src/v0.6/interfaces/AggregatorV3Interface.sol";

contract HistoricalPriceConsumerV3 {

    AggregatorV3Interface internal priceFeed;

    /**
     * Network: Kovan
     * Aggregator: ETH/USD
     * Address: 0x9326BFA02ADD2366b30bacB125260Af641031331
     */
    constructor() public {
        priceFeed = AggregatorV3Interface(0x9326BFA02ADD2366b30bacB125260Af641031331);
    }

    /**
     * Returns the latest price
     */
    function getHistoricalPrice(uint80 roundsBack) public view returns (int256) {
        (uint80 roundId,,,,) = priceFeed.latestRoundData();
        uint80 historicalRoundId = roundId - roundsBack;
        (
            uint80 id, 
            int price,
            uint startedAt,
            uint timeStamp,
            uint80 answeredInRound
        ) = priceFeed.getRoundData(historicalRoundId);
        return price;
    }
}