Mai Staking

MaiNFT.JSON

[
	{
		"inputs": [],
		"stateMutability": "nonpayable",
		"type": "constructor"
	},
	{
		"anonymous": false,
		"inputs": [
			{
				"indexed": true,
				"internalType": "address",
				"name": "owner",
				"type": "address"
			},
			{
				"indexed": true,
				"internalType": "address",
				"name": "approved",
				"type": "address"
			},
			{
				"indexed": true,
				"internalType": "uint256",
				"name": "tokenId",
				"type": "uint256"
			}
		],
		"name": "Approval",
		"type": "event"
	},
	{
		"anonymous": false,
		"inputs": [
			{
				"indexed": true,
				"internalType": "address",
				"name": "owner",
				"type": "address"
			},
			{
				"indexed": true,
				"internalType": "address",
				"name": "operator",
				"type": "address"
			},
			{
				"indexed": false,
				"internalType": "bool",
				"name": "approved",
				"type": "bool"
			}
		],
		"name": "ApprovalForAll",
		"type": "event"
	},
	{
		"anonymous": false,
		"inputs": [
			{
				"indexed": true,
				"internalType": "address",
				"name": "from",
				"type": "address"
			},
			{
				"indexed": true,
				"internalType": "address",
				"name": "to",
				"type": "address"
			},
			{
				"indexed": true,
				"internalType": "uint256",
				"name": "tokenId",
				"type": "uint256"
			}
		],
		"name": "Transfer",
		"type": "event"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "to",
				"type": "address"
			},
			{
				"internalType": "uint256",
				"name": "tokenId",
				"type": "uint256"
			}
		],
		"name": "approve",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "owner",
				"type": "address"
			}
		],
		"name": "balanceOf",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "count",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "tokenId",
				"type": "uint256"
			}
		],
		"name": "getApproved",
		"outputs": [
			{
				"internalType": "address",
				"name": "",
				"type": "address"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "owner",
				"type": "address"
			},
			{
				"internalType": "address",
				"name": "operator",
				"type": "address"
			}
		],
		"name": "isApprovedForAll",
		"outputs": [
			{
				"internalType": "bool",
				"name": "",
				"type": "bool"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "mint",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "name",
		"outputs": [
			{
				"internalType": "string",
				"name": "",
				"type": "string"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "tokenId",
				"type": "uint256"
			}
		],
		"name": "ownerOf",
		"outputs": [
			{
				"internalType": "address",
				"name": "",
				"type": "address"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "from",
				"type": "address"
			},
			{
				"internalType": "address",
				"name": "to",
				"type": "address"
			},
			{
				"internalType": "uint256",
				"name": "tokenId",
				"type": "uint256"
			}
		],
		"name": "safeTransferFrom",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "from",
				"type": "address"
			},
			{
				"internalType": "address",
				"name": "to",
				"type": "address"
			},
			{
				"internalType": "uint256",
				"name": "tokenId",
				"type": "uint256"
			},
			{
				"internalType": "bytes",
				"name": "_data",
				"type": "bytes"
			}
		],
		"name": "safeTransferFrom",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "operator",
				"type": "address"
			},
			{
				"internalType": "bool",
				"name": "approved",
				"type": "bool"
			}
		],
		"name": "setApprovalForAll",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "bytes4",
				"name": "interfaceId",
				"type": "bytes4"
			}
		],
		"name": "supportsInterface",
		"outputs": [
			{
				"internalType": "bool",
				"name": "",
				"type": "bool"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "symbol",
		"outputs": [
			{
				"internalType": "string",
				"name": "",
				"type": "string"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "index",
				"type": "uint256"
			}
		],
		"name": "tokenByIndex",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "owner",
				"type": "address"
			},
			{
				"internalType": "uint256",
				"name": "index",
				"type": "uint256"
			}
		],
		"name": "tokenOfOwnerByIndex",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "tokenId",
				"type": "uint256"
			}
		],
		"name": "tokenURI",
		"outputs": [
			{
				"internalType": "string",
				"name": "",
				"type": "string"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "totalSupply",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "from",
				"type": "address"
			},
			{
				"internalType": "address",
				"name": "to",
				"type": "address"
			},
			{
				"internalType": "uint256",
				"name": "tokenId",
				"type": "uint256"
			}
		],
		"name": "transferFrom",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	}
]

MaiNFT.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";

contract MayNFT is ERC721, ERC721Enumerable {
    uint public count;

    constructor() ERC721("Mai NFT", "T: Mai NFT") {}
    
    function mint() public
    {
        _mint(msg.sender, count);
        count++;
    }
    function supportsInterface(bytes4 interfaceId) public view override(ERC721, ERC721Enumerable) returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }

    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal override(ERC721, ERC721Enumerable)
    {
        super._beforeTokenTransfer(from, to, tokenId);
    }
}

StakingRewards.JSON

[
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "mai_nft_address",
				"type": "address"
			},
			{
				"internalType": "address",
				"name": "mai_token_address",
				"type": "address"
			}
		],
		"stateMutability": "nonpayable",
		"type": "constructor"
	},
	{
		"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": "uint256",
				"name": "token_id",
				"type": "uint256"
			}
		],
		"name": "claim",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"name": "dayRewards",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "amount",
				"type": "uint256"
			}
		],
		"name": "depositMai",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "initalizeClaim",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "maiNFT",
		"outputs": [
			{
				"internalType": "contract IERC721",
				"name": "",
				"type": "address"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "maiToken",
		"outputs": [
			{
				"internalType": "contract IERC20",
				"name": "",
				"type": "address"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "owner",
		"outputs": [
			{
				"internalType": "address",
				"name": "",
				"type": "address"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "renounceOwnership",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "rewardRateDailyPercentage",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "token_id",
				"type": "uint256"
			}
		],
		"name": "stake",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"name": "tokensDeposited",
		"outputs": [
			{
				"internalType": "bool",
				"name": "isDeposited",
				"type": "bool"
			},
			{
				"internalType": "address",
				"name": "owner",
				"type": "address"
			},
			{
				"internalType": "uint256",
				"name": "depositedTimestamp",
				"type": "uint256"
			},
			{
				"internalType": "uint256",
				"name": "lastClaimTimestamp",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "totalNFTDeposited",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "newOwner",
				"type": "address"
			}
		],
		"name": "transferOwnership",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "token_id",
				"type": "uint256"
			}
		],
		"name": "withdraw",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	}
]

StakingRewards.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

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

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

/**
 * @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 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 {
        _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);
    }
}

contract StakingRewards is Ownable {
    IERC721 public maiNFT;
    IERC20 public maiToken;

    struct TokenDeposited
    {
        bool isDeposited;
        address owner;
        uint depositedTimestamp;
        uint lastClaimTimestamp;
    }

    uint public totalNFTDeposited;
    mapping(uint => TokenDeposited) public tokensDeposited;

    uint public rewardRateDailyPercentage = 5;
    mapping(uint => uint) public dayRewards;
    uint rewardGenesisTiemstamp;
    uint lastDayCalculated;
    uint lastDayCalculatedTimestamp;
    bool isClaimActive = false;

    constructor(address mai_nft_address, address mai_token_address) {
        maiNFT = IERC721(mai_nft_address);
        maiToken = IERC20(mai_token_address);
    }

    // Admin

    function initalizeClaim() external onlyOwner
    {
        rewardGenesisTiemstamp = block.timestamp;
        isClaimActive = true;
    }

    // Modifiers

    modifier updateReward() {
        uint contractTokenSupply = maiToken.balanceOf(address(this));
        uint currentDayReward = ((contractTokenSupply * rewardRateDailyPercentage) / 10000)/ totalNFTDeposited;
        
        uint daysSinceLastDayRewardCalculation = (block.timestamp - lastDayCalculatedTimestamp)/(1 days);

        for(uint i=0; i<daysSinceLastDayRewardCalculation; i++)
        {
            dayRewards[lastDayCalculated + i] = currentDayReward;
        }
        lastDayCalculated = lastDayCalculated + daysSinceLastDayRewardCalculation;
        lastDayCalculatedTimestamp = block.timestamp;
        _;
    }

    // External functions

    function stake(uint token_id) external updateReward() {
        totalNFTDeposited += 1;
        tokensDeposited[token_id].isDeposited = true;
        tokensDeposited[token_id].owner = msg.sender;
        tokensDeposited[token_id].depositedTimestamp = block.timestamp;
        tokensDeposited[token_id].lastClaimTimestamp = block.timestamp;
        maiNFT.transferFrom(msg.sender, address(this), token_id);
    }

    function withdraw(uint token_id) external updateReward() {
        totalNFTDeposited -= 1;
        tokensDeposited[token_id].isDeposited = false;
        tokensDeposited[token_id].owner = address(0);
        maiNFT.transferFrom(address(this), msg.sender, token_id);
    }

    function claim(uint token_id) external updateReward() {
        uint amountDaysToClaim = (block.timestamp - tokensDeposited[token_id].lastClaimTimestamp) / (1 days);
        uint firstDayToClaim = (tokensDeposited[token_id].lastClaimTimestamp - rewardGenesisTiemstamp) / (1 days);
        uint reward;
        for(uint i=0; i<amountDaysToClaim;i++)
        {
            reward += dayRewards[firstDayToClaim + i];
        }
        tokensDeposited[token_id].lastClaimTimestamp = block.timestamp;
        maiToken.transfer(msg.sender, reward);
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint);

    function balanceOf(address account) external view returns (uint);

    function transfer(address recipient, uint amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}

interface IERC721 {
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    function balanceOf(address owner) external view returns (uint256 balance);
    function ownerOf(uint256 tokenId) external view returns (address owner);
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    function approve(address to, uint256 tokenId) external;
    function setApprovalForAll(address operator, bool _approved) external;
    function getApproved(uint256 tokenId) external view returns (address operator);
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

MAI (Test): 0x2aF56cb68BE0B92222Ff36e8A1E918E56A758903
MAI NFTs: 0x369CbecfE07f819263C88e32344d16E5d96DC061
Mai Staking: 0x191d6Df5C872DDA14bE59389341d5D6B256FFf28