Mumbai Testnet

Contract

0x05B0A8195AA4C21944d68f71a263f836670E3605

Overview

MATIC Balance

Polygon PoS Chain LogoPolygon PoS Chain LogoPolygon PoS Chain Logo0 MATIC

Token Holdings

Multichain Info

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Transaction Hash
Method
Block
From
To
Value
0x60e06040270855522022-07-08 18:04:40628 days ago1657303480IN
 Create: ChainlinkOracle
0 MATIC0.002743668

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Contract Source Code Verified (Exact Match)

Contract Name:
ChainlinkOracle

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
Yes with 1 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 4 : ChainlinkOracle.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.3;
pragma experimental ABIEncoderV2;

import '@openzeppelin/contracts/math/SafeMath.sol';

import '../interfaces/IOracle.sol';
import '../interfaces/IDataFeed.sol';

contract ChainlinkOracle is IOracle {
    using SafeMath for uint256;

    IDataFeed public immutable dataFeed;
    uint256 public immutable decimals;
    uint256 public immutable tolerance;

    /**
     * @notice Create the contract
     * @param _dataFeed - chainlink's data feed address to obtain a rate. https://docs.chain.link/docs/get-the-latest-price/#solidity
     * @param _decimals - amount of decimals the rate should be returned with
     * @param _tolerance - amount of time in seconds from getRate's call block timestamp that the rate can be accepted without receiving an update
     */
    constructor(IDataFeed _dataFeed, uint256 _decimals, uint256 _tolerance) {
        dataFeed = _dataFeed;
        decimals = _decimals;
        tolerance = _tolerance;
    }

    /**
     * @notice Get rate
     * @return rate in the expected token decimals
     */
    function getRate() external view override returns (uint256) {
        uint256 feedDecimals = uint256(dataFeed.decimals());

        (, int256 rate, , uint256 updatedAt, ) = dataFeed.latestRoundData();
        
        require(updatedAt >= block.timestamp.sub(tolerance), "ChainlinkOracle#getRate: STALE_RATE");

        if (rate <= 0) {
            revert('ChainlinkOracle#getRate: INVALID_RATE');
        }

        return uint256(rate).mul(10**(decimals.sub(feedDecimals)));
    }
}

File 2 of 4 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @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) {
        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, reverting 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) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting 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) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

File 3 of 4 : IOracle.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;
pragma experimental ABIEncoderV2;

interface IOracle {
    function getRate() external view returns (uint256);
}

File 4 of 4 : IDataFeed.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.6;
pragma experimental ABIEncoderV2;

/**
 * @notice Chainlink Data Feed interface
 * @dev This is a renamed copy of https://github.com/smartcontractkit/chainlink/blob/develop/contracts/src/v0.7/interfaces/AggregatorV3Interface.sol
 * containing only the required functions required by our contracts.
 * We could have imported the chainlink/contracts package but decided not to due to the large amount of things imported we would not need.
 */
interface IDataFeed {
    /**
     * @notice Get the number of decimals present in the response value
     * @return The number of decimals
     */
    function decimals() external view returns (uint8);

    /**
     * @notice Get the price from the latest round
     * @return roundId - The round ID
     * @return answer - The price 
     * @return startedAt - Timestamp of when the round started
     * @return updatedAt - Timestamp of when the round was updated
     * @return answeredInRound - The round ID of the round in which the answer was computed
     */
    function latestRoundData()
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 1
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract ABI

[{"inputs":[{"internalType":"contract IDataFeed","name":"_dataFeed","type":"address"},{"internalType":"uint256","name":"_decimals","type":"uint256"},{"internalType":"uint256","name":"_tolerance","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"dataFeed","outputs":[{"internalType":"contract IDataFeed","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tolerance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","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)

0000000000000000000000005521ade5494225e0936c74f97e474107d73c406e00000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000015180

-----Decoded View---------------
Arg [0] : _dataFeed (address): 0x5521ade5494225E0936c74f97e474107D73c406e
Arg [1] : _decimals (uint256): 18
Arg [2] : _tolerance (uint256): 86400

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000005521ade5494225e0936c74f97e474107d73c406e
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [2] : 0000000000000000000000000000000000000000000000000000000000015180


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