CELO Price: $0.80 (+0.72%)
Gas: 20 GWei

Contract

0x6ff6a0982c68f49586360F5Bef302ef8Ca837734

Overview

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CELO Value

$0.00

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Transaction Hash
Method
Block
From
To
Value
Transfer Ownersh...182268732023-03-14 14:02:03402 days ago1678802523IN
0x6ff6a098...8Ca837734
0 CELO0.0007229525
0x60806040182268702023-03-14 14:01:48402 days ago1678802508IN
 Contract Creation
0 CELO0.004248615

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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x3b870eC4...184b9b97D
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
NoExternalStrategy

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 10 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at celoscan.io on 2023-04-28
*/

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// File: contracts/strategies/IStrategy.sol

pragma solidity 0.8.7;

interface IStrategy {
    function invest(address _inboundCurrency, uint256 _minAmount) external payable;

    function earlyWithdraw(address _inboundCurrency, uint256 _amount, uint256 _minAmount) external;

    function redeem(
        address _inboundCurrency,
        uint256 _amount,
        uint256 _minAmount,
        bool disableRewardTokenClaim
    ) external;

    function getTotalAmount() external view returns (uint256);

    function getLPTokenAmount(uint256 _amount) external view returns (uint256);

    function getFee() external view returns (uint256);

    function getNetDepositAmount(uint256 _amount) external view returns (uint256);

    function getAccumulatedRewardTokenAmounts(bool disableRewardTokenClaim) external returns (uint256[] memory);

    function getRewardTokens() external view returns (IERC20[] memory);

    function getUnderlyingAsset() external view returns (address);

    function strategyOwner() external view returns (address);
}

// File: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

/**
 * @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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: contracts/strategies/NoExternalStrategy.sol



pragma solidity 0.8.7;



//*********************************************************************//
// --------------------------- custom errors ------------------------- //
//*********************************************************************//
error INVALID_REWARD_TOKEN();
error TOKEN_TRANSFER_FAILURE();
error TRANSACTIONAL_TOKEN_TRANSFER_FAILURE();

/**
  @notice
  This strategy holds the deposited funds without transferring them to an external protocol.
  @author Francis Odisi & Viraz Malhotra.
*/
contract NoExternalStrategy is Ownable, IStrategy {
    /// @notice inbound token (deposit token) address
    IERC20 public inboundToken;

    /// @notice reward token address
    IERC20[] public rewardTokens;

    //*********************************************************************//
    // ------------------------- external views -------------------------- //
    //*********************************************************************//

    /** 
    @notice
    Get strategy owner address.
    @return Strategy owner.
    */
    function strategyOwner() external view override returns (address) {
        return super.owner();
    }

    /** 
    @notice
    Returns the total accumulated amount (i.e., principal + interest) stored in curve.
    Intended for usage by external clients and in case of variable deposit pools.
    @return Total accumulated amount.
    */
    function getTotalAmount() external view override returns (uint256) {
        return address(inboundToken) == address(0) ? address(this).balance : inboundToken.balanceOf(address(this));
    }

    /** 
    @notice
    Get the expected net deposit amount (amount minus slippage) for a given amount. Used only for AMM strategies.
    @return net amount.
    */
    function getNetDepositAmount(uint256 _amount) external pure override returns (uint256) {
        return _amount;
    }

    /** 
    @notice
    Returns the underlying token address.
    @return Returns the underlying inbound (deposit) token address.
    */
    function getUnderlyingAsset() external view override returns (address) {
        return address(inboundToken);
    }

    /** 
    @notice
    Returns the instances of the reward tokens
    */
    function getRewardTokens() external view override returns (IERC20[] memory) {
        return rewardTokens;
    }

    /** 
    @notice
    Returns the lp token amount received (for amm strategies)
    */
    function getLPTokenAmount(uint256 _amount) external pure override returns (uint256) {
        return _amount;
    }

    /** 
    @notice
    Returns the fee (for amm strategies)
    */
    function getFee() external pure override returns (uint256) {
        return 0;
    }

    //*********************************************************************//
    // -------------------------- constructor ---------------------------- //
    //*********************************************************************//

    /** 
    @param _inboundCurrency inbound currency address.
    */
    constructor(address _inboundCurrency, IERC20[] memory _rewardTokens) {
        inboundToken = IERC20(_inboundCurrency);
        uint256 numRewards = _rewardTokens.length;
        for (uint256 i = 0; i < numRewards; ) {
            if (address(_rewardTokens[i]) == address(0)) {
                revert INVALID_REWARD_TOKEN();
            }
            unchecked {
                ++i;
            }
        }
        rewardTokens = _rewardTokens;
    }

    //*********************************************************************//
    // ------------------------- internal method -------------------------- //
    //*********************************************************************//
    /** 
    @notice
    Transfers inbound token amount back to pool.
    @param _inboundCurrency Address of the inbound token.
    @param _amount transfer amount
    */
    function _transferInboundTokenToPool(address _inboundCurrency, uint256 _amount) internal {
        if (_inboundCurrency == address(0)) {
            (bool success, ) = msg.sender.call{ value: _amount }("");
            if (!success) {
                revert TRANSACTIONAL_TOKEN_TRANSFER_FAILURE();
            }
        } else {
            bool success = IERC20(_inboundCurrency).transfer(msg.sender, _amount);
            if (!success) {
                revert TOKEN_TRANSFER_FAILURE();
            }
        }
    }

    /**
    @notice
    Deposits funds into this contract.
    @param _inboundCurrency Address of the inbound token.
    @param _minAmount Used for aam strategies, since every strategy overrides from the same strategy interface hence it is defined here.
    _minAmount isn't needed in this strategy but since all strategies override from the same interface and the amm strategies need it hence it is used here.
    */
    function invest(address _inboundCurrency, uint256 _minAmount) external payable override onlyOwner {}

    /**
    @notice
    Withdraws funds from this strategy in case of an early withdrawal.
    @param _inboundCurrency Address of the inbound token.
    @param _amount Amount to withdraw.
    @param _minAmount Used for aam strategies, since every strategy overrides from the same strategy interface hence it is defined here.
    _minAmount isn't needed in this strategy but since all strategies override from the same interface and the amm strategies need it hence it is used here.
    */
    function earlyWithdraw(address _inboundCurrency, uint256 _amount, uint256 _minAmount) external override onlyOwner {
        _transferInboundTokenToPool(_inboundCurrency, _amount);
    }

    /**
    @notice
    Redeems funds from this strategy when the waiting round for the good ghosting pool is over.
    @param _inboundCurrency Address of the inbound token.
    @param _amount Amount to withdraw.
    @param _minAmount Used for aam strategies, since every strategy overrides from the same strategy interface hence it is defined here.
    _minAmount isn't needed in this strategy but since all strategies override from the same interface and the amm strategies need it hence it is used here.
    @param disableRewardTokenClaim Reward claim disable flag.
    */
    function redeem(
        address _inboundCurrency,
        uint256 _amount,
        uint256 _minAmount,
        bool disableRewardTokenClaim
    ) external override onlyOwner {
        uint256 _balance = _inboundCurrency == address(0)
            ? address(this).balance
            : IERC20(_inboundCurrency).balanceOf(address(this));
        // safety check since funds don't get transferred to a extrnal protocol
        if (_amount > _balance) {
            _amount = _balance;
        }

        _transferInboundTokenToPool(_inboundCurrency, _amount);

        if (!disableRewardTokenClaim) {
            // avoid multiple SLOADS
            IERC20[] memory _rewardTokens = rewardTokens;
            uint256 numRewards = _rewardTokens.length;
            for (uint256 i = 0; i < numRewards; ) {
                // safety check since funds don't get transferred to a extrnal protocol
                if (_rewardTokens[i].balanceOf(address(this)) != 0) {
                    bool success = _rewardTokens[i].transfer(msg.sender, _rewardTokens[i].balanceOf(address(this)));
                    if (!success) {
                        revert TOKEN_TRANSFER_FAILURE();
                    }
                }
                unchecked {
                    ++i;
                }
            }
        }
    }

    /**
    @notice
    Returns total accumulated reward token amount.
    @param disableRewardTokenClaim Reward claim disable flag.
    */
    function getAccumulatedRewardTokenAmounts(
        bool disableRewardTokenClaim
    ) external view override returns (uint256[] memory) {
        // avoid multiple SLOADS
        IERC20[] memory _rewardTokens = rewardTokens;
        uint256 numRewards = _rewardTokens.length;
        uint256[] memory amounts = new uint256[](numRewards);
        for (uint256 i = 0; i < numRewards; ) {
            amounts[i] = _rewardTokens[i].balanceOf(address(this));
            unchecked {
                ++i;
            }
        }
        return amounts;
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_inboundCurrency","type":"address"},{"internalType":"contract IERC20[]","name":"_rewardTokens","type":"address[]"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"INVALID_REWARD_TOKEN","type":"error"},{"inputs":[],"name":"TOKEN_TRANSFER_FAILURE","type":"error"},{"inputs":[],"name":"TRANSACTIONAL_TOKEN_TRANSFER_FAILURE","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"address","name":"_inboundCurrency","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"uint256","name":"_minAmount","type":"uint256"}],"name":"earlyWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"disableRewardTokenClaim","type":"bool"}],"name":"getAccumulatedRewardTokenAmounts","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"getLPTokenAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"getNetDepositAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"getRewardTokens","outputs":[{"internalType":"contract IERC20[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTotalAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getUnderlyingAsset","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"inboundToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_inboundCurrency","type":"address"},{"internalType":"uint256","name":"_minAmount","type":"uint256"}],"name":"invest","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_inboundCurrency","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"uint256","name":"_minAmount","type":"uint256"},{"internalType":"bool","name":"disableRewardTokenClaim","type":"bool"}],"name":"redeem","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"rewardTokens","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"strategyOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

Deployed Bytecode

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Swarm Source

ipfs://b22a727b154e4e8b229205c5c8bfd2818630b548d99c3d74bd041b653362dbc3

Block Transaction Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.