Address Contract Verified
Address
0xAe6B44ebdd005669B410524eC076424A7308e9e1
Balance
0 ETH
Nonce
1
Code Size
3905 bytes
Creator
0x11EC7849...710D at tx 0x4fd3377f...7e4108
Indexed Transactions
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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
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