Chainlink

Install Dependencies

forge install smartcontractkit/chainlink

Using in contract

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.0;

import "lib/chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

contract SampleOracle {
     ///@dev Asset Pricefeed interface from Chainlink
    AggregatorV3Interface public immutable priceFeed;   
    
    constructor (address priceFeedAddress) {
       priceFeed = AggregatorV3Interface(priceFeedAddress);
    }
    
    function getPrice() {
       (,int price,,,) = priceFeed.latestRoundData();
    } 
    
}