Address Details

contract

0x572564B0efEC39Dd325138187F5DD4e75B17251E

Contract Name: StakingRewards

Creator: 0x9ee360–7a65d2 at 0x326c20–38c74d

Balance: 0 CELO ( )

Locked CELO Balance: 0.00 CELO

Voting CELO Balance: 0.00 CELO

Pending Unlocked Gold: 0.00 CELO

Tokens: Fetching tokens... Error trying to fetch balances.

Transactions: 14,703 Transactions

Transfers: 15,287 Transfers

Gas Used: 1,175,014,932

Last Balance Update: 12840156

Transactions Token Transfers Tokens Internal Transactions Coin Balance History Logs Code Read Contract Write Contract

This contract has been verified via Sourcify. View contract in Sourcify repository

Contract name:: StakingRewards
Optimization enabled: true

Compiler version: v0.8.3+commit.8d00100c
Optimization runs: 999999

EVM Version: istanbul
Verified at: 2021-05-02T20:52:29.209587Z

Contract source code

// SPDX-License-Identifier: MIT
// solhint-disable not-rely-on-time

pragma solidity ^0.8.3;

import "../../openzeppelin-solidity/contracts/Math.sol";
import "../../openzeppelin-solidity/contracts/SafeMath.sol";
import "../../openzeppelin-solidity/contracts/SafeERC20.sol";
import "../../openzeppelin-solidity/contracts/ReentrancyGuard.sol";

// Inheritance
import "./interfaces/IStakingRewards.sol";
import "./RewardsDistributionRecipient.sol";


// https://docs.synthetix.io/contracts/source/contracts/stakingrewards
// XXX: removed Pausable
contract StakingRewards is IStakingRewards, RewardsDistributionRecipient, ReentrancyGuard {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    /* ========== STATE VARIABLES ========== */

    IERC20 public rewardsToken;
    IERC20 public stakingToken;
    uint256 public periodFinish = 0;
    uint256 public rewardRate = 0;
    uint256 public rewardsDuration = 7 days;
    uint256 public lastUpdateTime;
    uint256 public rewardPerTokenStored;

    mapping(address => uint256) public userRewardPerTokenPaid;
    mapping(address => uint256) public rewards;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;

    /* ========== CONSTRUCTOR ========== */

    constructor(
        address _owner,
        address _rewardsDistribution,
        address _rewardsToken,
        address _stakingToken
    ) Owned(_owner) {
        rewardsToken = IERC20(_rewardsToken);
        stakingToken = IERC20(_stakingToken);
        rewardsDistribution = _rewardsDistribution;
    }

    /* ========== VIEWS ========== */

    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) external view override returns (uint256) {
        return _balances[account];
    }

    function lastTimeRewardApplicable() public view override returns (uint256) {
        return Math.min(block.timestamp, periodFinish);
    }

    function rewardPerToken() public view override returns (uint256) {
        if (_totalSupply == 0) {
            return rewardPerTokenStored;
        }
        return
            rewardPerTokenStored.add(
                lastTimeRewardApplicable().sub(lastUpdateTime).mul(rewardRate).mul(1e18).div(_totalSupply)
            );
    }

    function earned(address account) public view override returns (uint256) {
        return _balances[account].mul(rewardPerToken().sub(userRewardPerTokenPaid[account])).div(1e18).add(rewards[account]);
    }

    function getRewardForDuration() external view override returns (uint256) {
        return rewardRate.mul(rewardsDuration);
    }

    /* ========== MUTATIVE FUNCTIONS ========== */

    // XXX: removed notPaused
    function stake(uint256 amount) external override nonReentrant updateReward(msg.sender) {
        require(amount > 0, "Cannot stake 0");
        _totalSupply = _totalSupply.add(amount);
        _balances[msg.sender] = _balances[msg.sender].add(amount);
        stakingToken.safeTransferFrom(msg.sender, address(this), amount);
        emit Staked(msg.sender, amount);
    }

    function withdraw(uint256 amount) public override nonReentrant updateReward(msg.sender) {
        require(amount > 0, "Cannot withdraw 0");
        _totalSupply = _totalSupply.sub(amount);
        _balances[msg.sender] = _balances[msg.sender].sub(amount);
        stakingToken.safeTransfer(msg.sender, amount);
        emit Withdrawn(msg.sender, amount);
    }

    function getReward() public override nonReentrant updateReward(msg.sender) {
        uint256 reward = rewards[msg.sender];
        if (reward > 0) {
            rewards[msg.sender] = 0;
            rewardsToken.safeTransfer(msg.sender, reward);
            emit RewardPaid(msg.sender, reward);
        }
    }

    function exit() external override {
        withdraw(_balances[msg.sender]);
        getReward();
    }

    /* ========== RESTRICTED FUNCTIONS ========== */

    function notifyRewardAmount(uint256 reward) external override onlyRewardsDistribution updateReward(address(0)) {
        if (block.timestamp >= periodFinish) {
            rewardRate = reward.div(rewardsDuration);
        } else {
            uint256 remaining = periodFinish.sub(block.timestamp);
            uint256 leftover = remaining.mul(rewardRate);
            rewardRate = reward.add(leftover).div(rewardsDuration);
        }

        // Ensure the provided reward amount is not more than the balance in the contract.
        // This keeps the reward rate in the right range, preventing overflows due to
        // very high values of rewardRate in the earned and rewardsPerToken functions;
        // Reward + leftover must be less than 2^256 / 10^18 to avoid overflow.
        uint balance = rewardsToken.balanceOf(address(this));
        require(rewardRate <= balance.div(rewardsDuration), "Provided reward too high");

        lastUpdateTime = block.timestamp;
        periodFinish = block.timestamp.add(rewardsDuration);
        emit RewardAdded(reward);
    }

    // End rewards emission earlier
    function updatePeriodFinish(uint timestamp) external onlyOwner updateReward(address(0)) {
        periodFinish = timestamp;
    }

    // Added to support recovering LP Rewards from other systems such as BAL to be distributed to holders
    function recoverERC20(address tokenAddress, uint256 tokenAmount) external onlyOwner {
        require(tokenAddress != address(stakingToken), "Cannot withdraw the staking token");
        IERC20(tokenAddress).safeTransfer(owner, tokenAmount);
        emit Recovered(tokenAddress, tokenAmount);
    }

    function setRewardsDuration(uint256 _rewardsDuration) external onlyOwner {
        require(
            block.timestamp > periodFinish,
            "Previous rewards period must be complete before changing the duration for the new period"
        );
        rewardsDuration = _rewardsDuration;
        emit RewardsDurationUpdated(rewardsDuration);
    }

    /* ========== MODIFIERS ========== */

    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateTime = lastTimeRewardApplicable();
        if (account != address(0)) {
            rewards[account] = earned(account);
            userRewardPerTokenPaid[account] = rewardPerTokenStored;
        }
        _;
    }

    /* ========== EVENTS ========== */

    event RewardAdded(uint256 reward);
    event Staked(address indexed user, uint256 amount);
    event Withdrawn(address indexed user, uint256 amount);
    event RewardPaid(address indexed user, uint256 reward);
    event RewardsDurationUpdated(uint256 newDuration);
    event Recovered(address token, uint256 amount);
}

Contract ABI

[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_owner","internalType":"address"},{"type":"address","name":"_rewardsDistribution","internalType":"address"},{"type":"address","name":"_rewardsToken","internalType":"address"},{"type":"address","name":"_stakingToken","internalType":"address"}]},{"type":"event","name":"OwnerChanged","inputs":[{"type":"address","name":"oldOwner","internalType":"address","indexed":false},{"type":"address","name":"newOwner","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"OwnerNominated","inputs":[{"type":"address","name":"newOwner","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"Recovered","inputs":[{"type":"address","name":"token","internalType":"address","indexed":false},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RewardAdded","inputs":[{"type":"uint256","name":"reward","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RewardPaid","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"reward","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"RewardsDurationUpdated","inputs":[{"type":"uint256","name":"newDuration","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Staked","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Withdrawn","inputs":[{"type":"address","name":"user","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"acceptOwnership","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"balanceOf","inputs":[{"type":"address","name":"account","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"earned","inputs":[{"type":"address","name":"account","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"exit","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"getReward","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getRewardForDuration","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"lastTimeRewardApplicable","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"lastUpdateTime","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"nominateNewOwner","inputs":[{"type":"address","name":"_owner","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"nominatedOwner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"notifyRewardAmount","inputs":[{"type":"uint256","name":"reward","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"periodFinish","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"recoverERC20","inputs":[{"type":"address","name":"tokenAddress","internalType":"address"},{"type":"uint256","name":"tokenAmount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"rewardPerToken","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"rewardPerTokenStored","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"rewardRate","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"rewards","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"rewardsDistribution","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"rewardsDuration","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IERC20"}],"name":"rewardsToken","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setRewardsDistribution","inputs":[{"type":"address","name":"_rewardsDistribution","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setRewardsDuration","inputs":[{"type":"uint256","name":"_rewardsDuration","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"stake","inputs":[{"type":"uint256","name":"amount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IERC20"}],"name":"stakingToken","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalSupply","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updatePeriodFinish","inputs":[{"type":"uint256","name":"timestamp","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"userRewardPerTokenPaid","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdraw","inputs":[{"type":"uint256","name":"amount","internalType":"uint256"}]}]

Deployed ByteCode

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0x572564B0efEC39Dd325138187F5DD4e75B17251E

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