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Address Contract Verified

Address 0x15f7744C393CD07bEac9322cE531bd0cB363536b
Balance 0 ETH
Nonce 1
Code Size 3905 bytes
Creator 0xcfaD496f...a781 at tx 0xd42b30c7...abc4ae
Indexed Transactions 0 (1 on-chain, 1.1% indexed)
External Etherscan · Sourcify

Contract Bytecode

3905 bytes
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Verified Source Code Full Match

Compiler: v0.8.20+commit.a1b79de6 EVM: shanghai Optimization: Yes (10000 runs)
ChainlinkBasePriceFeed.sol 162 lines 
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "src/interfaces/IChainlinkFeed.sol";

interface IAggregator {
    function maxAnswer() external view returns (int192);

    function minAnswer() external view returns (int192);
}

// Standard feed component for FiRM price feeds
/// @dev Always return the feed price in 18 decimals
contract ChainlinkBasePriceFeed {
    IChainlinkFeed public immutable assetToUsd;
    IChainlinkFeed public immutable assetToUsdFallback;
    uint8 public immutable assetToUsdDecimals;
    uint8 public immutable assetToUsdFallbackDecimals;
    string public description;

    address public owner;
    address public pendingOwner;

    uint256 public assetToUsdHeartbeat;

    modifier onlyOwner() {
        require(msg.sender == owner, "Only owner");
        _;
    }

    modifier onlyPendingOwner() {
        require(msg.sender == pendingOwner, "Only pending owner");
        _;
    }

    constructor(
        address _owner,
        address _assetToUsd,
        address _assetToUsdFallback,
        uint256 _assetToUsdHeartbeat
    ) {
        owner = _owner;
        assetToUsd = IChainlinkFeed(_assetToUsd);
        assetToUsdFallback = IChainlinkFeed(_assetToUsdFallback);
        assetToUsdHeartbeat = _assetToUsdHeartbeat;
        assetToUsdDecimals = IChainlinkFeed(_assetToUsd).decimals();
        uint8 fallbackDecimals = 0;
        if (address(assetToUsdFallback) != address(0)) {
            fallbackDecimals = assetToUsdFallback.decimals();
        }
        assetToUsdFallbackDecimals = fallbackDecimals;
        description = assetToUsd.description();
    }

    /**
     * @notice Retrieves the latest round data for the asset token price feed
     * @return roundId The round ID of the Chainlink price feed for the feed with the lowest updatedAt feed
     * @return usdPrice The latest asset price in USD with 18 decimals
     * @return startedAt The timestamp when the latest round of Chainlink price feed started of the lowest last updatedAt feed
     * @return updatedAt The lowest timestamp when either of the latest round of Chainlink price feed was updated
     * @return answeredInRound The round ID in which the answer was computed of the lowest updatedAt feed
     */
    function latestRoundData()
        public
        view
        returns (
            uint80 roundId,
            int256 usdPrice,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        )
    {
        (roundId, usdPrice, startedAt, updatedAt, answeredInRound) = assetToUsd
            .latestRoundData();

        if (isPriceStale(usdPrice, updatedAt)) {
            if (hasFallback()) {
                (
                    roundId,
                    usdPrice,
                    startedAt,
                    updatedAt,
                    answeredInRound
                ) = assetToUsdFallback.latestRoundData();
                usdPrice = normalizePrice(usdPrice, assetToUsdFallbackDecimals);
            } else {
                usdPrice = normalizePrice(usdPrice, assetToUsdDecimals);
                updatedAt = 0;
            }
        } else {
            usdPrice = normalizePrice(usdPrice, assetToUsdDecimals);
        }
    }

    /**
     * @notice Returns the latest price only
     * @dev Unlike chainlink oracles, the latestAnswer will always be the same as in the latestRoundData
     * @return int256 Returns the last finalized price of the chainlink oracle
     */
    function latestAnswer() external view returns (int256) {
        (, int256 latestPrice, , , ) = latestRoundData();
        return latestPrice;
    }

    /**
     * @notice Checks if a given price is out of the boundaries defined in the Chainlink aggregator.
     * @param price The price to be checked.
     * @param feed The Chainlink feed to retrieve the boundary information from.
     * @return bool Returns `true` if the price is out of bounds, otherwise `false`.
     */
    function isPriceOutOfBounds(
        int price,
        IChainlinkFeed feed
    ) public view returns (bool) {
        IAggregator aggregator = IAggregator(feed.aggregator());
        int192 max = aggregator.maxAnswer();
        int192 min = aggregator.minAnswer();
        return (max <= price || min >= price);
    }

    function isPriceStale(
        int256 price,
        uint256 updatedAt
    ) public view returns (bool) {
        bool stalePrice = updatedAt + assetToUsdHeartbeat < block.timestamp;
        return stalePrice || isPriceOutOfBounds(price, assetToUsd);
    }

    function hasFallback() public view returns (bool) {
        return address(assetToUsdFallback) != address(0);
    }

    function setHeartbeat(uint256 newHeartbeat) public onlyOwner {
        assetToUsdHeartbeat = newHeartbeat;
    }

    function setPendingOwner(address newPendingOwner) public onlyOwner {
        pendingOwner = newPendingOwner;
    }

    function acceptOwner() public onlyPendingOwner {
        owner = pendingOwner;
        pendingOwner = address(0);
    }

    function decimals() public pure returns (uint8) {
        return 18;
    }

    function normalizePrice(
        int256 price,
        uint8 feedDecimals
    ) public pure returns (int256) {
        if (feedDecimals > 18) {
            return price / int(10 ** (feedDecimals - 18));
        } else if (feedDecimals < 18) {
            return price * int(10 ** (18 - feedDecimals));
        }
        return price;
    }
}
IChainlinkFeed.sol 30 lines 
pragma solidity ^0.8.13;

interface IChainlinkFeed {
    function aggregator() external view returns (address aggregator);

    function decimals() external view returns (uint8 decimals);

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

    function latestAnswer() external view returns (int256 price);

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

interface IChainlinkBasePriceFeed is IChainlinkFeed {
    function assetToUsd() external view returns (IChainlinkFeed);

    function assetToUsdFallback() external view returns (IChainlinkFeed);

    function assetToUsdHeartbeat() external view returns (uint256 heartbeat);
}

Read Contract

assetToUsd 0xd116c081 → address
assetToUsdDecimals 0x1af214a8 → uint8
assetToUsdFallback 0xebdac458 → address
assetToUsdFallbackDecimals 0xa06a7207 → uint8
assetToUsdHeartbeat 0x620518d8 → uint256
decimals 0x313ce567 → uint8
description 0x7284e416 → string
hasFallback 0x8a0531a6 → bool
isPriceOutOfBounds 0x0d73ed7b → bool
isPriceStale 0xacdb31f6 → bool
latestAnswer 0x50d25bcd → int256
latestRoundData 0xfeaf968c → uint80, int256, uint256, uint256, uint80
normalizePrice 0xa0dcdc68 → int256
owner 0x8da5cb5b → address
pendingOwner 0xe30c3978 → address

Write Contract 3 functions

These functions modify contract state and require a wallet transaction to execute.

acceptOwner 0xebbc4965
No parameters
setHeartbeat 0xd29dba91
uint256 newHeartbeat
setPendingOwner 0xc42069ec
address newPendingOwner
Transactions Internal Txs Token Transfers Events

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