Contract 0x150B4fD25c7c0c65301e86B599822f2feeCC29E7

 
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0x032388acb8db04c1cdc5f1523439b2126e00df820053d9a26c544a59b7940539Claim221852572021-12-06 2:15:341 day 30 mins ago0x5985cfc7e4b1c03aa97e6f74bf317d6f06dd3e20 IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.00260772
0xa1f3cccd8624bd55a725b53c4e16851e09a90d650e776966f8a5d4c75fcdb273Claim221724162021-12-05 17:55:331 day 8 hrs ago0x6a9d8b216d3ceb41329762cc5054c45f6827859a IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.002868492
0xbd062a1843c49567104fad8371fd0cd313f903f630b1467c3dff5b78a800d9a6Genesis Lock Rou...221699332021-12-05 16:16:041 day 10 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.00172235
0x3726a8a35df93802d0babd1bed612ed3235e6ecb6cc467b56b6854ba5b9752a7Genesis Start Ro...221697582021-12-05 16:10:021 day 10 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.00737405
0x412c9d3ce061a1a3b665d7b224f67716919aac075c803690283b1d88a2f2058eReset221697532021-12-05 16:09:521 day 10 hrs ago0x45b04f6a1a7ec9678cb208d6dc3a5ce5929e9838 IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.00074652
0x0b90b5512ce763bb22da379633b01bf9a3c5e24f6ab098c38b6f716144034a0dExecute Round221697502021-12-05 16:09:461 day 10 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.0032602
0xff8430acceabca30c58fb458e78eda5a24bc136304157fbd13968fb0495d2073Execute Round221696092021-12-05 16:04:561 day 10 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.0032602
0xa227a980132826efd62e704b3be3062defe6049351de8fcf31e6b2ff77cd86b6Claim221695862021-12-05 16:04:001 day 10 hrs ago0xdd68685d939a5003b2128330f8cf90d65c661be6 IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.00583881
0x531ee4eb5d40046e3cf00fa5aeab1bef4450a9f1f298360242f6f0f22e753454Execute Round221695272021-12-05 15:58:341 day 10 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.01294505
0xc2ee0188baa44d7377a906a4f10407770baf83667ec8a93d6da42545d3b10a28Claim221693902021-12-05 15:53:521 day 10 hrs ago0x4ec2dcdfb3c165da62dd1367cb42fe7551524984 IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.00260772
0xb9fa4de5f05524aab84009e3dd8f3f73cdb73feea6bf0931b5553e1f81d58c01Execute Round221693792021-12-05 15:53:301 day 10 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.01295695
0xb134fbd30e0430673f5e085b9d275da93867b073987302a5dc3319607bf4862aExecute Round221692852021-12-05 15:48:221 day 10 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.01507955
0x2f3b977f696b7836d95d1d877bcdcdeb79b61b6566e1504a6c56fca0ca0ecac0Execute Round221691352021-12-05 15:42:581 day 11 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.01295695
0x49b9ba4944ecf1dc30a24000e69b4687a3520533968b5d3928a5f00423d3ed3bBet Bear221691212021-12-05 15:42:301 day 11 hrs ago0x6a9d8b216d3ceb41329762cc5054c45f6827859a IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e73.93 MATIC0.00819763
0x13d518fd3cbf164a057bc8ff25476b6c388f4062d17ec7a2840442f41673bc02Bet Bear221691192021-12-05 15:42:261 day 11 hrs ago0xdd68685d939a5003b2128330f8cf90d65c661be6 IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70.25 MATIC0.010065675
0x9df6bdeeabb4eb1474b2cd9f6f93415a8cf4ae089af60874de31fc147029abd4Bet Bull221690642021-12-05 15:40:321 day 11 hrs ago0x4ec2dcdfb3c165da62dd1367cb42fe7551524984 IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e730 MATIC0.00394293
0xb5200c44d4380116b2753c26cd550cea551a91075f62712051eb4149f85d7fa5Claim221690592021-12-05 15:40:221 day 11 hrs ago0x4ec2dcdfb3c165da62dd1367cb42fe7551524984 IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.00260901
0x0c6883c100d84b1f6bf904048576e704d6096862b80bb65a68417050b14ce236Execute Round221689852021-12-05 15:37:501 day 11 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.01509145
0x096efadb4462528bb12167984be1726c4dab695a2b8131ab32196294b78aed3fExecute Round221688342021-12-05 15:32:401 day 11 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.01295695
0x05c33f1a03d92886ae837ddffe48c2015755795de825bf6e05b4ff675e39cf4bBet Bull221688232021-12-05 15:32:141 day 11 hrs ago0x6a9d8b216d3ceb41329762cc5054c45f6827859a IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e74.365 MATIC0.00680617
0xcc8d1b45a511fa7b09e42474bd20becc879880363c057a7e7293c52c8b20c706Bet Bull221688192021-12-05 15:32:061 day 11 hrs ago0xdd68685d939a5003b2128330f8cf90d65c661be6 IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70.25 MATIC0.004458909
0x9338a741100a773914a848c1408ac0ae0903aa9dbd2f77fb13b3f3d5d158ee32Claim221688182021-12-05 15:32:041 day 11 hrs ago0xdd68685d939a5003b2128330f8cf90d65c661be6 IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.003390036
0xe8d3edef60fd55862e43e9858c7b91d9fffab92bac31a11cd24c82e2228b5a09Bet Bear221687162021-12-05 15:28:361 day 11 hrs ago0x4ec2dcdfb3c165da62dd1367cb42fe7551524984 IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e730 MATIC0.00453927
0xb9f28e1b3a964ac38eb3ba7aac035e6e6a9fcf371c4c22438037cd68c49743a0Execute Round221686832021-12-05 15:27:261 day 11 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.01507955
0xddeb2d7592a04a4de53efa2c3ed61d2fa2852f4aeae0977fc7c8cdfd4d34c752Execute Round221685342021-12-05 15:22:201 day 11 hrs ago0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f IN  0x150b4fd25c7c0c65301e86b599822f2feecc29e70 MATIC0.01295695
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0x032388acb8db04c1cdc5f1523439b2126e00df820053d9a26c544a59b7940539221852572021-12-06 2:15:341 day 30 mins ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x5985cfc7e4b1c03aa97e6f74bf317d6f06dd3e200.0194 MATIC
0xa1f3cccd8624bd55a725b53c4e16851e09a90d650e776966f8a5d4c75fcdb273221724162021-12-05 17:55:331 day 8 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x6a9d8b216d3ceb41329762cc5054c45f6827859a31.946338655462184873 MATIC
0xc2ee0188baa44d7377a906a4f10407770baf83667ec8a93d6da42545d3b10a28221693902021-12-05 15:53:521 day 10 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x4ec2dcdfb3c165da62dd1367cb42fe755152498433.1546 MATIC
0xb5200c44d4380116b2753c26cd550cea551a91075f62712051eb4149f85d7fa5221690592021-12-05 15:40:221 day 11 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x4ec2dcdfb3c165da62dd1367cb42fe755152498433.57655 MATIC
0x9338a741100a773914a848c1408ac0ae0903aa9dbd2f77fb13b3f3d5d158ee32221688182021-12-05 15:32:041 day 11 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70xdd68685d939a5003b2128330f8cf90d65c661be61.770861344537815126 MATIC
0xbcd6bb89531bf66c2eccde6bd74f8ccab56a10d16a23307676fe1ae98663c521221672932021-12-05 14:33:101 day 12 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70xdd68685d939a5003b2128330f8cf90d65c661be60.25 MATIC
0x78e0cc62b4adb5c96fd97d9d4026e36ea638601d0a85012583b17e70cc7a3ccb221563912021-12-05 7:17:591 day 19 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x5985cfc7e4b1c03aa97e6f74bf317d6f06dd3e200.0194 MATIC
0x277e81fbf9abc2ea05f2e08ced6b699d0c100a0bd3d02c099717e65ed4a654b8221315622021-12-04 16:34:242 days 10 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x1fac7bd5964dd4d1f26a373bf31281faa0e7b26219.4 MATIC
0x84316bf05604f8255e134daab0f0d7cb676f9449d813ee4e10bd3626ca2e24d4221295652021-12-04 15:18:352 days 11 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x1fac7bd5964dd4d1f26a373bf31281faa0e7b262199.5 MATIC
0x64f48b6bc59600ebcb88a79f6e0a24c4218f44add8e0381fe6de4115f4d2e6f7221240032021-12-04 11:41:082 days 15 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x1fac7bd5964dd4d1f26a373bf31281faa0e7b262199 MATIC
0x30fb4bc3288c8c638fd57c3e00890ab68ed748cae2130feea156a25c6b6d365e221194222021-12-04 8:43:112 days 18 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x248cd2628e07b2520e39864c99f9cb67370cfb5c0.03 MATIC
0x8066f5bd5b9439828857808cb6eb67e3e1883d8baaa1c9879da484853f8daf29221166172021-12-04 6:56:542 days 19 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x6a9d8b216d3ceb41329762cc5054c45f6827859a4.820115842988832885 MATIC
0x119e057de9fd53ef01be49136e58e44c55e122c6dc24cd000ac47db396a54ddf221166162021-12-04 6:56:522 days 19 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x6a9d8b216d3ceb41329762cc5054c45f6827859a5.4016875 MATIC
0x6776025c95f020fd7743737c182f74d51be2180e98f37b28301b972e19c3ed78221093722021-12-04 2:19:363 days 26 mins ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70xdd68685d939a5003b2128330f8cf90d65c661be60.964023168597766577 MATIC
0x9c89b55bec1481e9d0988d95f34216e28295094014cb78ffa62da3cf723d54be221050722021-12-03 23:21:523 days 3 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70xdd68685d939a5003b2128330f8cf90d65c661be61.0003125 MATIC
0xae9bea00bf38f1b1a12de7e9ab6fbf81c0689df9aaa1651dc4dad77eb732da3c221023632021-12-03 21:37:263 days 5 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x6a9d8b216d3ceb41329762cc5054c45f6827859a0.2425 MATIC
0xb7a39c16c60bcd8ac5b39d77e875d47b192a59e6dbefbf069439f643d80ec0c9220974072021-12-03 18:33:423 days 8 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x348bfd598e46f9e5204eb449ce3909fe1af80e274 MATIC
0x324a84bed789824f7d02efb767ce02f9b7d49ea19724d39dcd61863f652ff0f1220861582021-12-03 11:33:593 days 15 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x6a9d8b216d3ceb41329762cc5054c45f6827859a0.21825 MATIC
0x6ff79b969d300c25b40384c194791b81a13e8c9793bb861708c4e3709dee88ab220861572021-12-03 11:33:573 days 15 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x6a9d8b216d3ceb41329762cc5054c45f6827859a0.21825 MATIC
0xe52d672e76825e0010d3a3b9b798f3e45ba0743752928a69746b6f87ec47f7ba220861572021-12-03 11:33:573 days 15 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x6a9d8b216d3ceb41329762cc5054c45f6827859a0.230121641791044776 MATIC
0xd6df86019279135dda0c91bebe1b87b2a70c71d38ad9aaa4540c964ccc2de8f3220847242021-12-03 10:32:213 days 16 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x8d0b6b8801fcb79817a563b1856182765d01910a0.21825 MATIC
0xc41853a9ffccf331f79fa7905b4dc341a597d00fb9af2cbc755f093cb09bdc29220815522021-12-03 8:19:123 days 18 hrs ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70xfd7846f77e41bbdae1bce61b2bb361ee04216cb71.558695652173913043 MATIC
0x3ee92ef8b06fbd2a3d2034796b1c600bfd8ee8fbbcbec876ce0b02ddd189a1da220712712021-12-03 2:00:304 days 45 mins ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70xdd68685d939a5003b2128330f8cf90d65c661be60.676828358208955223 MATIC
0x48f7b341693f33ed2275f84435e792f795b49f8b214c0f849b48f37cea2f4015220712152021-12-03 1:57:144 days 48 mins ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x248cd2628e07b2520e39864c99f9cb67370cfb5c0.06 MATIC
0x64403c9e31e9ff81086d98372e291da60bc4d6658345396164192df04abf961d220712112021-12-03 1:57:064 days 48 mins ago 0x150b4fd25c7c0c65301e86b599822f2feecc29e70x248cd2628e07b2520e39864c99f9cb67370cfb5c0.776 MATIC
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Contract Source Code Verified (Exact Match)

Contract Name:
DfynPricePrediction

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 1000000 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 10 : DfynPredictionMarket.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

import "./interfaces/AggregatorV3Interface.sol";

contract DfynPricePrediction is Ownable, Pausable {
    using SafeMath for uint256;

    struct Round {
        uint256 epoch;
        uint256 startTime;
        uint256 lockTime;
        uint256 endTime;
        int256 lockPrice;
        int256 closePrice;
        uint256 totalAmount;
        uint256 bullAmount;
        uint256 bearAmount;
        uint256 rewardBaseCalAmount;
        uint256 rewardAmount;
        bool oracleCalled;
    }

    enum Position {
        Bull,
        Bear
    }

    struct BetInfo {
        Position position;
        uint256 amount;
        bool claimed; // default false
    }

    mapping(uint256 => Round) public rounds;
    mapping(uint256 => mapping(address => BetInfo)) public ledger;
    mapping(address => uint256[]) public userRounds;
    uint256 public currentEpoch;
    uint256 public interval;
    uint256 public buffer;
    address public adminAddress;
    address public operatorAddress;
    uint256 public treasuryAmount;
    AggregatorV3Interface internal oracle;
    uint256 public oracleLatestRoundId;

    uint256 public constant TOTAL_RATE = 100; // 100%
    uint256 public rewardRate = 90; // 90%
    uint256 public treasuryRate = 10; // 10%
    uint256 public minBetAmount;
    uint256 public oracleUpdateAllowance; // seconds

    bool public genesisStartOnce = false;
    bool public genesisLockOnce = false;

    event StartRound(uint256 indexed epoch, uint256 time);
    event LockRound(uint256 indexed epoch, uint256 time, int256 price);
    event EndRound(uint256 indexed epoch, uint256 time, int256 price);
    event BetBull(
        address indexed sender,
        uint256 indexed currentEpoch,
        uint256 amount
    );
    event BetBear(
        address indexed sender,
        uint256 indexed currentEpoch,
        uint256 amount
    );
    event Claim(
        address indexed sender,
        uint256 indexed currentEpoch,
        uint256 amount
    );
    event ClaimTreasury(uint256 amount);
    event RatesUpdated(
        uint256 indexed epoch,
        uint256 rewardRate,
        uint256 treasuryRate
    );
    event MinBetAmountUpdated(uint256 indexed epoch, uint256 minBetAmount);
    event RewardsCalculated(
        uint256 indexed epoch,
        uint256 rewardBaseCalAmount,
        uint256 rewardAmount,
        uint256 treasuryAmount
    );
    event Pause(uint256 epoch);
    event Unpause(uint256 epoch);
    event Reset(uint256 epoch);

    constructor(
        AggregatorV3Interface _oracle,
        address _adminAddress,
        address _operatorAddress,
        uint256 _interval,
        uint256 _buffer,
        uint256 _minBetAmount,
        uint256 _oracleUpdateAllowance
    ) public {
        oracle = _oracle;
        adminAddress = _adminAddress;
        operatorAddress = _operatorAddress;
        interval = _interval;
        buffer = _buffer;
        minBetAmount = _minBetAmount;
        oracleUpdateAllowance = _oracleUpdateAllowance;
    }

    modifier onlyAdmin() {
        require(msg.sender == adminAddress, "admin: wut?");
        _;
    }

    modifier onlyOperator() {
        require(msg.sender == operatorAddress, "operator: wut?");
        _;
    }

    modifier onlyAdminOrOperator() {
        require(
            msg.sender == adminAddress || msg.sender == operatorAddress,
            "admin | operator: wut?"
        );
        _;
    }

    modifier notContract() {
        require(!_isContract(msg.sender), "contract not allowed");
        require(msg.sender == tx.origin, "proxy contract not allowed");
        _;
    }

    /**
     * @dev set admin address
     * callable by owner
     */
    function setAdmin(address _adminAddress) external onlyOwner {
        require(_adminAddress != address(0), "Cannot be zero address");
        adminAddress = _adminAddress;
    }

    /**
     * @dev set operator address
     * callable by admin
     */
    function setOperator(address _operatorAddress) external onlyAdmin {
        require(_operatorAddress != address(0), "Cannot be zero address");
        operatorAddress = _operatorAddress;
    }

    /**
     * @dev set interval in seconds
     * callable by admin
     */
    function setInterval(uint256 _interval) external onlyAdmin {
        interval = _interval;
    }

    /**
     * @dev set buffer in seconds
     * callable by admin
     */
    function setBuffer(uint256 _buffer) external onlyAdmin {
        require(_buffer <= interval, "Cannot be more than interval");
        buffer = _buffer;
    }

    /**
     * @dev set Oracle address
     * callable by admin
     */
    function setOracle(address _oracle) external onlyAdmin {
        require(_oracle != address(0), "Cannot be zero address");
        oracle = AggregatorV3Interface(_oracle);
    }

    /**
     * @dev set oracle update allowance
     * callable by admin
     */
    function setOracleUpdateAllowance(uint256 _oracleUpdateAllowance)
        external
        onlyAdmin
    {
        oracleUpdateAllowance = _oracleUpdateAllowance;
    }

    /**
     * @dev set reward rate
     * callable by admin
     */
    function setRewardRate(uint256 _rewardRate) external onlyAdmin {
        require(
            _rewardRate <= TOTAL_RATE,
            "rewardRate cannot be more than 100%"
        );
        rewardRate = _rewardRate;
        treasuryRate = TOTAL_RATE.sub(_rewardRate);

        emit RatesUpdated(currentEpoch, rewardRate, treasuryRate);
    }

    /**
     * @dev set treasury rate
     * callable by admin
     */
    function setTreasuryRate(uint256 _treasuryRate) external onlyAdmin {
        require(
            _treasuryRate <= TOTAL_RATE,
            "treasuryRate cannot be more than 100%"
        );
        rewardRate = TOTAL_RATE.sub(_treasuryRate);
        treasuryRate = _treasuryRate;

        emit RatesUpdated(currentEpoch, rewardRate, treasuryRate);
    }

    /**
     * @dev set minBetAmount
     * callable by admin
     */
    function setMinBetAmount(uint256 _minBetAmount) external onlyAdmin {
        minBetAmount = _minBetAmount;

        emit MinBetAmountUpdated(currentEpoch, minBetAmount);
    }

    /**
     * @dev Start genesis round
     */
    function genesisStartRound() external onlyOperator whenNotPaused {
        require(!genesisStartOnce, "Can only run genesisStartRound once");

        currentEpoch = currentEpoch + 1;
        _startRound(currentEpoch);
        genesisStartOnce = true;
    }

    /**
     * @dev Lock genesis round
     */
    function genesisLockRound() external onlyOperator whenNotPaused {
        require(
            genesisStartOnce,
            "Can only run after genesisStartRound is triggered"
        );
        require(!genesisLockOnce, "Can only run genesisLockRound once");
        require(
            block.timestamp <= rounds[currentEpoch].lockTime.add(buffer),
            "Can only lock round within buffer"
        );

        int256 currentPrice = _getPriceFromOracle();
        _safeLockRound(currentEpoch, currentPrice);

        currentEpoch = currentEpoch + 1;
        _startRound(currentEpoch);
        genesisLockOnce = true;
    }

    /**
     * @dev Start the next round n, lock price for round n-1, end round n-2
     */
    function executeRound() external onlyOperator whenNotPaused {
        require(
            genesisStartOnce && genesisLockOnce,
            "Can only run after genesisStartRound and genesisLockRound is triggered"
        );

        int256 currentPrice = _getPriceFromOracle();
        // CurrentEpoch refers to previous round (n-1)
        _safeLockRound(currentEpoch, currentPrice);
        _safeEndRound(currentEpoch - 1, currentPrice);
        _calculateRewards(currentEpoch - 1);

        // Increment currentEpoch to current round (n)
        currentEpoch = currentEpoch + 1;
        _safeStartRound(currentEpoch);
    }

    /**
     * @dev Bet bear position
     */
    function betBear() external payable whenNotPaused notContract {
        require(_bettable(currentEpoch), "Round not bettable");
        require(
            msg.value >= minBetAmount,
            "Bet amount must be greater than minBetAmount"
        );
        require(
            ledger[currentEpoch][msg.sender].amount == 0,
            "Can only bet once per round"
        );

        // Update round data
        uint256 amount = msg.value;
        Round storage round = rounds[currentEpoch];
        round.totalAmount = round.totalAmount.add(amount);
        round.bearAmount = round.bearAmount.add(amount);

        // Update user data
        BetInfo storage betInfo = ledger[currentEpoch][msg.sender];
        betInfo.position = Position.Bear;
        betInfo.amount = amount;
        userRounds[msg.sender].push(currentEpoch);

        emit BetBear(msg.sender, currentEpoch, amount);
    }

    /**
     * @dev Bet bull position
     */
    function betBull() external payable whenNotPaused notContract {
        require(_bettable(currentEpoch), "Round not bettable");
        require(
            msg.value >= minBetAmount,
            "Bet amount must be greater than minBetAmount"
        );
        require(
            ledger[currentEpoch][msg.sender].amount == 0,
            "Can only bet once per round"
        );

        // Update round data
        uint256 amount = msg.value;
        Round storage round = rounds[currentEpoch];
        round.totalAmount = round.totalAmount.add(amount);
        round.bullAmount = round.bullAmount.add(amount);

        // Update user data
        BetInfo storage betInfo = ledger[currentEpoch][msg.sender];
        betInfo.position = Position.Bull;
        betInfo.amount = amount;
        userRounds[msg.sender].push(currentEpoch);

        emit BetBull(msg.sender, currentEpoch, amount);
    }

    /**
     * @dev Claim reward
     */
    function claim(uint256 epoch) external notContract {
        require(rounds[epoch].startTime != 0, "Round has not started");
        require(block.timestamp > rounds[epoch].endTime, "Round has not ended");
        require(!ledger[epoch][msg.sender].claimed, "Rewards claimed");

        uint256 reward;
        // Round valid, claim rewards
        if (rounds[epoch].oracleCalled) {
            require(claimable(epoch, msg.sender), "Not eligible for claim");
            Round memory round = rounds[epoch];
            reward = ledger[epoch][msg.sender]
            .amount
            .mul(round.rewardAmount)
            .div(round.rewardBaseCalAmount);
        }
        // Round invalid, refund bet amount
        else {
            require(refundable(epoch, msg.sender), "Not eligible for refund");
            reward = ledger[epoch][msg.sender].amount;
        }

        BetInfo storage betInfo = ledger[epoch][msg.sender];
        betInfo.claimed = true;
        _safeTransferToken(address(msg.sender), reward);

        emit Claim(msg.sender, epoch, reward);
    }

    /**
     * @dev Claim all rewards in treasury
     * callable by admin
     */
    function claimTreasury() external onlyAdmin {
        uint256 currentTreasuryAmount = treasuryAmount;
        treasuryAmount = 0;
        _safeTransferToken(adminAddress, currentTreasuryAmount);

        emit ClaimTreasury(currentTreasuryAmount);
    }

    /**
     * @dev Return round epochs that a user has participated
     */
    function getUserRounds(
        address user,
        uint256 cursor,
        uint256 size
    ) external view returns (uint256[] memory, uint256) {
        uint256 length = size;
        if (length > userRounds[user].length - cursor) {
            length = userRounds[user].length - cursor;
        }

        uint256[] memory values = new uint256[](length);
        for (uint256 i = 0; i < length; i++) {
            values[i] = userRounds[user][cursor + i];
        }

        return (values, cursor + length);
    }

    /**
     * @dev called by the admin to pause, triggers stopped state
     */
    function pause() public onlyAdminOrOperator whenNotPaused {
        _pause();

        emit Pause(currentEpoch);
    }

    /**
     * @dev called by the admin to unpause, returns to normal state
     * Reset genesis state. Once paused, the rounds would need to be kickstarted by genesis
     */
    function unpause() public onlyAdmin whenPaused {
        genesisStartOnce = false;
        genesisLockOnce = false;
        _unpause();

        emit Unpause(currentEpoch);
    }

    function reset() public onlyAdmin whenNotPaused {
        pause();
        unpause();

        emit Reset(currentEpoch);
    }

    /**
     * @dev Get the claimable stats of specific epoch and user account
     */
    function claimable(uint256 epoch, address user) public view returns (bool) {
        BetInfo memory betInfo = ledger[epoch][user];
        Round memory round = rounds[epoch];
        if (round.lockPrice == round.closePrice) {
            return false;
        }
        return
            round.oracleCalled &&
            ((round.closePrice > round.lockPrice &&
                betInfo.position == Position.Bull) ||
                (round.closePrice < round.lockPrice &&
                    betInfo.position == Position.Bear));
    }

    function lastRound() public view returns (Round memory round) {
        return rounds[currentEpoch];
    }

    /**
     * @dev Get the refundable stats of specific epoch and user account
     */
    function refundable(uint256 epoch, address user)
        public
        view
        returns (bool)
    {
        BetInfo memory betInfo = ledger[epoch][user];
        Round memory round = rounds[epoch];
        return
            !round.oracleCalled &&
            block.timestamp > round.endTime.add(buffer) &&
            betInfo.amount != 0;
    }

    /**
     * @dev Start round
     * Previous round n-2 must end
     */
    function _safeStartRound(uint256 epoch) internal {
        require(
            genesisStartOnce,
            "Can only run after genesisStartRound is triggered"
        );
        require(
            rounds[epoch - 2].endTime != 0,
            "Can only start round after round n-2 has ended"
        );
        require(
            block.timestamp >= rounds[epoch - 2].endTime,
            "Can only start new round after round n-2 endTime"
        );
        _startRound(epoch);
    }

    function _startRound(uint256 epoch) internal {
        Round storage round = rounds[epoch];
        round.startTime = block.timestamp;
        round.lockTime = block.timestamp.add(interval);
        round.endTime = block.timestamp.add(interval * 2);
        round.epoch = epoch;
        round.totalAmount = 0;

        emit StartRound(epoch, block.timestamp);
    }

    /**
     * @dev Lock round
     */
    function _safeLockRound(uint256 epoch, int256 price) internal {
        require(
            rounds[epoch].startTime != 0,
            "Can only lock round after round has started"
        );
        require(
            block.timestamp >= rounds[epoch].lockTime,
            "Can only lock round after lockTime"
        );
        require(
            block.timestamp <= rounds[epoch].lockTime.add(buffer),
            "Can only lock round within buffer"
        );
        _lockRound(epoch, price);
    }

    function _lockRound(uint256 epoch, int256 price) internal {
        Round storage round = rounds[epoch];
        round.lockPrice = price;

        emit LockRound(epoch, block.timestamp, round.lockPrice);
    }

    /**
     * @dev End round
     */
    function _safeEndRound(uint256 epoch, int256 price) internal {
        require(
            rounds[epoch].lockTime != 0,
            "Can only end round after round has locked"
        );
        require(
            block.timestamp >= rounds[epoch].endTime,
            "Can only end round after endTime"
        );
        require(
            block.timestamp <= rounds[epoch].endTime.add(buffer),
            "Can only end round within buffer"
        );
        _endRound(epoch, price);
    }

    function _endRound(uint256 epoch, int256 price) internal {
        Round storage round = rounds[epoch];
        round.closePrice = price;
        round.oracleCalled = true;

        emit EndRound(epoch, block.timestamp, round.closePrice);
    }

    /**
     * @dev Calculate rewards for round
     */
    function _calculateRewards(uint256 epoch) internal {
        require(
            rewardRate.add(treasuryRate) == TOTAL_RATE,
            "rewardRate and treasuryRate must add up to TOTAL_RATE"
        );
        require(
            rounds[epoch].rewardBaseCalAmount == 0 &&
                rounds[epoch].rewardAmount == 0,
            "Rewards calculated"
        );
        Round storage round = rounds[epoch];
        uint256 rewardBaseCalAmount;
        uint256 rewardAmount;
        uint256 treasuryAmt;
        // Bull wins
        if (round.closePrice > round.lockPrice) {
            rewardBaseCalAmount = round.bullAmount;
            rewardAmount = round.totalAmount.mul(rewardRate).div(TOTAL_RATE);
            treasuryAmt = round.totalAmount.mul(treasuryRate).div(TOTAL_RATE);
        }
        // Bear wins
        else if (round.closePrice < round.lockPrice) {
            rewardBaseCalAmount = round.bearAmount;
            rewardAmount = round.totalAmount.mul(rewardRate).div(TOTAL_RATE);
            treasuryAmt = round.totalAmount.mul(treasuryRate).div(TOTAL_RATE);
        }
        // House wins
        else {
            rewardBaseCalAmount = 0;
            rewardAmount = 0;
            treasuryAmt = round.totalAmount;
        }
        round.rewardBaseCalAmount = rewardBaseCalAmount;
        round.rewardAmount = rewardAmount;

        // Add to treasury
        treasuryAmount = treasuryAmount.add(treasuryAmt);

        emit RewardsCalculated(
            epoch,
            rewardBaseCalAmount,
            rewardAmount,
            treasuryAmt
        );
    }

    /**
     * @dev Get latest recorded price from oracle
     * If it falls below allowed buffer or has not updated, it would be invalid
     */
    function _getPriceFromOracle() internal returns (int256) {
        uint256 leastAllowedTimestamp = block.timestamp.add(
            oracleUpdateAllowance
        );
        (uint80 roundId, int256 price, , uint256 timestamp, ) = oracle
        .latestRoundData();
        require(
            timestamp <= leastAllowedTimestamp,
            "Oracle update exceeded max timestamp allowance"
        );
        require(
            roundId >= oracleLatestRoundId,
            "Oracle update roundId must be larger than oracleLatestRoundId"
        );
        oracleLatestRoundId = uint256(roundId);
        return price;
    }

    function isRefundable() public view returns (bool) {
        return
            (block.timestamp >= rounds[currentEpoch - 1].endTime.add(buffer)) &&
            (block.timestamp >= rounds[currentEpoch].lockTime.add(buffer)) &&
            !rounds[currentEpoch].oracleCalled;
    }

    function _safeTransferToken(address to, uint256 value) internal {
        (bool success, ) = to.call{gas: 23000, value: value}("");
        require(success, "TransferHelper: CURRENCY_TRANSFER_FAILED");
    }

    function _isContract(address addr) internal view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(addr)
        }
        return size > 0;
    }

    /**
     * @dev Determine if a round is valid for receiving bets
     * Round must have started and locked
     * Current time must be within startTime and endTime
     */
    function _bettable(uint256 epoch) internal view returns (bool) {
        return
            rounds[epoch].startTime != 0 &&
            rounds[epoch].lockTime != 0 &&
            block.timestamp > rounds[epoch].startTime &&
            block.timestamp < rounds[epoch].lockTime;
    }
}

File 2 of 10 : AggregatorV3Interface.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0;

interface AggregatorV3Interface {
    function decimals() external view returns (uint8);

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

    function version() external view returns (uint256);

    // getRoundData and latestRoundData should both raise "No data present"
    // if they do not have data to report, instead of returning unset values
    // which could be misinterpreted as actual reported values.
    function getRoundData(uint80 _roundId)
        external
        view
        returns (
            uint80 roundId,
            int256 answer,
            uint256 startedAt,
            uint256 updatedAt,
            uint80 answeredInRound
        );

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

File 3 of 10 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/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.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * 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.
 */
abstract 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 {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the 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 virtual 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 virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 4 of 10 : 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 5 of 10 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

File 6 of 10 : SafeERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

File 7 of 10 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 8 of 10 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @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.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

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

File 9 of 10 : Pausable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () internal {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

File 10 of 10 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"contract AggregatorV3Interface","name":"_oracle","type":"address"},{"internalType":"address","name":"_adminAddress","type":"address"},{"internalType":"address","name":"_operatorAddress","type":"address"},{"internalType":"uint256","name":"_interval","type":"uint256"},{"internalType":"uint256","name":"_buffer","type":"uint256"},{"internalType":"uint256","name":"_minBetAmount","type":"uint256"},{"internalType":"uint256","name":"_oracleUpdateAllowance","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"uint256","name":"currentEpoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"BetBear","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"uint256","name":"currentEpoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"BetBull","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"uint256","name":"currentEpoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Claim","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"ClaimTreasury","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"epoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"},{"indexed":false,"internalType":"int256","name":"price","type":"int256"}],"name":"EndRound","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"epoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"},{"indexed":false,"internalType":"int256","name":"price","type":"int256"}],"name":"LockRound","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"epoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"minBetAmount","type":"uint256"}],"name":"MinBetAmountUpdated","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"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"epoch","type":"uint256"}],"name":"Pause","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"epoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"rewardRate","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"treasuryRate","type":"uint256"}],"name":"RatesUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"epoch","type":"uint256"}],"name":"Reset","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"epoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"rewardBaseCalAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"rewardAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"treasuryAmount","type":"uint256"}],"name":"RewardsCalculated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"epoch","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"time","type":"uint256"}],"name":"StartRound","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"epoch","type":"uint256"}],"name":"Unpause","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[],"name":"TOTAL_RATE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"adminAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"betBear","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"betBull","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"buffer","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"epoch","type":"uint256"}],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"claimTreasury","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"epoch","type":"uint256"},{"internalType":"address","name":"user","type":"address"}],"name":"claimable","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentEpoch","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"executeRound","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"genesisLockOnce","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"genesisLockRound","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"genesisStartOnce","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"genesisStartRound","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"cursor","type":"uint256"},{"internalType":"uint256","name":"size","type":"uint256"}],"name":"getUserRounds","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"interval","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isRefundable","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastRound","outputs":[{"components":[{"internalType":"uint256","name":"epoch","type":"uint256"},{"internalType":"uint256","name":"startTime","type":"uint256"},{"internalType":"uint256","name":"lockTime","type":"uint256"},{"internalType":"uint256","name":"endTime","type":"uint256"},{"internalType":"int256","name":"lockPrice","type":"int256"},{"internalType":"int256","name":"closePrice","type":"int256"},{"internalType":"uint256","name":"totalAmount","type":"uint256"},{"internalType":"uint256","name":"bullAmount","type":"uint256"},{"internalType":"uint256","name":"bearAmount","type":"uint256"},{"internalType":"uint256","name":"rewardBaseCalAmount","type":"uint256"},{"internalType":"uint256","name":"rewardAmount","type":"uint256"},{"internalType":"bool","name":"oracleCalled","type":"bool"}],"internalType":"struct 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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000ab594600376ec9fd91f8e885dadf0ce036862de000000000000000000000000045b04f6a1a7ec9678cb208d6dc3a5ce5929e98380000000000000000000000003a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f0000000000000000000000000000000000000000000000000000000000000384000000000000000000000000000000000000000000000000000000000000003c000000000000000000000000000000000000000000000000002386f26fc100000000000000000000000000000000000000000000000000000000000000000014

-----Decoded View---------------
Arg [0] : _oracle (address): 0xab594600376ec9fd91f8e885dadf0ce036862de0
Arg [1] : _adminAddress (address): 0x45b04f6a1a7ec9678cb208d6dc3a5ce5929e9838
Arg [2] : _operatorAddress (address): 0x3a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f
Arg [3] : _interval (uint256): 900
Arg [4] : _buffer (uint256): 60
Arg [5] : _minBetAmount (uint256): 10000000000000000
Arg [6] : _oracleUpdateAllowance (uint256): 20

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 000000000000000000000000ab594600376ec9fd91f8e885dadf0ce036862de0
Arg [1] : 00000000000000000000000045b04f6a1a7ec9678cb208d6dc3a5ce5929e9838
Arg [2] : 0000000000000000000000003a2d4403cd065127bbfbe6ca2c49f1dfb051dc8f
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000384
Arg [4] : 000000000000000000000000000000000000000000000000000000000000003c
Arg [5] : 000000000000000000000000000000000000000000000000002386f26fc10000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000014


Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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