CELO Price: $0.11 (-1.43%)
Gas: 25 GWei

Contract

0x568547688121AA69bDEB8aEB662C321c5D7B98D0

Overview

CELO Balance

Celo Mainnet LogoCelo Mainnet LogoCelo Mainnet Logo0 CELO

CELO Value

$0.00

More Info

Private Name Tags

Multichain Info

Transaction Hash
Block
From
To
Transfer Ownersh...63795522021-04-26 21:57:551735 days ago1619474275IN
0x56854768...c5D7B98D0
0 CELO0.000014560.5

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Contract Source Code Verified (Exact Match)

Contract Name:
CeloProxyPriceProvider

Compiler Version
v0.5.14+commit.01f1aaa4

Optimization Enabled:
Yes with 200 runs

Other Settings:
istanbul EvmVersion, None license

Contract Source Code (Solidity Standard Json-Input format)

pragma solidity ^0.5.0;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/ownership/Ownable.sol";

import "../interfaces/IPriceOracleGetter.sol";
import "../libraries/EthAddressLib.sol";

interface ISortedOracles {
    function medianRate(address) external view returns (uint256, uint256);
    function medianTimestamp(address) external view returns (uint256);
}

interface IRegistry {
    function getAddressForOrDie(bytes32) external view returns (address);
}

contract UsingRegistry {
    bytes32 constant GOLD_TOKEN_REGISTRY_ID = keccak256(abi.encodePacked("GoldToken"));
    bytes32 constant SORTED_ORACLES_REGISTRY_ID = keccak256(abi.encodePacked("SortedOracles"));

    IRegistry constant public registry = IRegistry(0x000000000000000000000000000000000000ce10);

    function getGoldToken() internal view returns (address) {
        return registry.getAddressForOrDie(GOLD_TOKEN_REGISTRY_ID);
    }

    function getSortedOracles() internal view returns (ISortedOracles) {
        return ISortedOracles(registry.getAddressForOrDie(SORTED_ORACLES_REGISTRY_ID));
    }
}

/// @title CeloProxyPriceProvider
/// @author Moola
/// @notice Proxy smart contract to get the price of an asset from a price source, with Celo SortedOracles
///         smart contracts as primary option
/// - If the returned price by a SortedOracles is <= 0, the call is forwarded to a fallbackOracle
/// - Owned by the Aave governance system, allowed to add sources for assets, replace them
///   and change the fallbackOracle
contract CeloProxyPriceProvider is IPriceOracleGetter, Ownable, UsingRegistry {
    using SafeMath for uint256;

    event AssetSourceUpdated(address indexed asset, address indexed source);
    event FallbackOracleUpdated(address indexed fallbackOracle);

    IPriceOracleGetter private fallbackOracle;

    /// @notice Constructor
    /// @param _fallbackOracle The address of the fallback oracle to use if the data of an
    ///        aggregator is not consistent
    constructor(address _fallbackOracle) public {
        internalSetFallbackOracle(_fallbackOracle);
    }

    /// @notice Sets the fallbackOracle
    /// - Callable only by the Aave governance
    /// @param _fallbackOracle The address of the fallbackOracle
    function setFallbackOracle(address _fallbackOracle) external onlyOwner {
        internalSetFallbackOracle(_fallbackOracle);
    }

    /// @notice Internal function to set the fallbackOracle
    /// @param _fallbackOracle The address of the fallbackOracle
    function internalSetFallbackOracle(address _fallbackOracle) internal {
        fallbackOracle = IPriceOracleGetter(_fallbackOracle);
        emit FallbackOracleUpdated(_fallbackOracle);
    }

    /// @notice Gets an asset price by address
    /// @param _asset The asset address
    function getAssetPrice(address _asset) public view returns(uint256) {
        if (_asset == EthAddressLib.ethAddress()) {
            return 1 ether;
        }
        if (_asset == getGoldToken()) {
            return 1 ether;
        }
        uint256 _price;
        uint256 _divisor;
        ISortedOracles _oracles = getSortedOracles();
        (_price, _divisor) = _oracles.medianRate(_asset);
        require(_price > 0, "Reported price is 0");
        uint _reportTime = _oracles.medianTimestamp(_asset);
        require(block.timestamp.sub(_reportTime) < 10 minutes, "Reported price is older than 10 minutes");
        return _divisor.mul(1 ether).div(_price);
    }

    /// @notice Gets a list of prices from a list of assets addresses
    /// @param _assets The list of assets addresses
    function getAssetsPrices(address[] calldata _assets) external view returns(uint256[] memory) {
        uint256[] memory prices = new uint256[](_assets.length);
        for (uint256 i = 0; i < _assets.length; i++) {
            prices[i] = getAssetPrice(_assets[i]);
        }
        return prices;
    }

    /// @notice Gets the address of the fallback oracle
    /// @return address The addres of the fallback oracle
    function getFallbackOracle() external view returns(address) {
        return address(fallbackOracle);
    }
}

pragma solidity ^0.5.0;

/************
@title IPriceOracleGetter interface
@notice Interface for the Aave price oracle.*/
interface IPriceOracleGetter {
    /***********
    @dev returns the asset price in ETH
     */
    function getAssetPrice(address _asset) external view returns (uint256);
}

File 3 of 6 : EthAddressLib.sol
pragma solidity ^0.5.0;

library EthAddressLib {

    /**
    * @dev returns the address used within the protocol to identify ETH
    * @return the address assigned to ETH
     */
    function ethAddress() internal pure returns(address) {
        return 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
    }
}

pragma solidity ^0.5.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

pragma solidity ^0.5.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

pragma solidity ^0.5.0;

import "../GSN/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        _owner = _msgSender();
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

Settings
{
  "evmVersion": "istanbul",
  "libraries": {},
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

API
[{"inputs":[{"internalType":"address","name":"_fallbackOracle","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":true,"internalType":"address","name":"source","type":"address"}],"name":"AssetSourceUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"fallbackOracle","type":"address"}],"name":"FallbackOracleUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"constant":true,"inputs":[{"internalType":"address","name":"_asset","type":"address"}],"name":"getAssetPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address[]","name":"_assets","type":"address[]"}],"name":"getAssetsPrices","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getFallbackOracle","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"registry","outputs":[{"internalType":"contract IRegistry","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_fallbackOracle","type":"address"}],"name":"setFallbackOracle","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _fallbackOracle (address): 0x0000000000000000000000000000000000000000

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000


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Swarm Source

bzzr://7af8fcf500db8878ce962827e981b2867eb38c92280577e5addf8525ca9a6bda

Block Transaction Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
View All Deposits
0x568547688121AA69bDEB8aEB662C321c5D7B98D0
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.