BUSD.JSON

[
	{
		"inputs": [],
		"stateMutability": "nonpayable",
		"type": "constructor"
	},
	{
		"anonymous": false,
		"inputs": [
			{
				"indexed": true,
				"internalType": "address",
				"name": "owner",
				"type": "address"
			},
			{
				"indexed": true,
				"internalType": "address",
				"name": "spender",
				"type": "address"
			},
			{
				"indexed": false,
				"internalType": "uint256",
				"name": "value",
				"type": "uint256"
			}
		],
		"name": "Approval",
		"type": "event"
	},
	{
		"anonymous": false,
		"inputs": [
			{
				"indexed": true,
				"internalType": "address",
				"name": "from",
				"type": "address"
			},
			{
				"indexed": true,
				"internalType": "address",
				"name": "to",
				"type": "address"
			},
			{
				"indexed": false,
				"internalType": "uint256",
				"name": "value",
				"type": "uint256"
			}
		],
		"name": "Transfer",
		"type": "event"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "owner",
				"type": "address"
			},
			{
				"internalType": "address",
				"name": "spender",
				"type": "address"
			}
		],
		"name": "allowance",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "spender",
				"type": "address"
			},
			{
				"internalType": "uint256",
				"name": "amount",
				"type": "uint256"
			}
		],
		"name": "approve",
		"outputs": [
			{
				"internalType": "bool",
				"name": "",
				"type": "bool"
			}
		],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "account",
				"type": "address"
			}
		],
		"name": "balanceOf",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "decimals",
		"outputs": [
			{
				"internalType": "uint8",
				"name": "",
				"type": "uint8"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "spender",
				"type": "address"
			},
			{
				"internalType": "uint256",
				"name": "subtractedValue",
				"type": "uint256"
			}
		],
		"name": "decreaseAllowance",
		"outputs": [
			{
				"internalType": "bool",
				"name": "",
				"type": "bool"
			}
		],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "spender",
				"type": "address"
			},
			{
				"internalType": "uint256",
				"name": "addedValue",
				"type": "uint256"
			}
		],
		"name": "increaseAllowance",
		"outputs": [
			{
				"internalType": "bool",
				"name": "",
				"type": "bool"
			}
		],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "name",
		"outputs": [
			{
				"internalType": "string",
				"name": "",
				"type": "string"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "symbol",
		"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": "recipient",
				"type": "address"
			},
			{
				"internalType": "uint256",
				"name": "amount",
				"type": "uint256"
			}
		],
		"name": "transfer",
		"outputs": [
			{
				"internalType": "bool",
				"name": "",
				"type": "bool"
			}
		],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "sender",
				"type": "address"
			},
			{
				"internalType": "address",
				"name": "recipient",
				"type": "address"
			},
			{
				"internalType": "uint256",
				"name": "amount",
				"type": "uint256"
			}
		],
		"name": "transferFrom",
		"outputs": [
			{
				"internalType": "bool",
				"name": "",
				"type": "bool"
			}
		],
		"stateMutability": "nonpayable",
		"type": "function"
	}
]

BUSD.sol

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

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.1.0/contracts/token/ERC20/ERC20.sol";

contract MyERC20 is ERC20 {
  constructor () ERC20("BUSD Test", "T:BUSD") {
    _mint(msg.sender, 1_000_000_000 ether);
  }
}

Presale.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);
    }
}

interface IERC20
{
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

contract TokenPresale is Ownable {
    IERC20 public maiToken;
    IERC20 public busdToken;

    uint public RATE = 1;
    uint public MAX_WALLET = 6_000 ether;
    uint public MAX_TOTAL = 63_000 ether;
    uint public TIMELOCK_DURATION = 1 days;//60 days;

    bool public isPublicSaleActive;
    bool public isClaimActive;
    uint public claimGenesisTimestamp;

    uint public totalDeposited;

    mapping(address => bool) public whitelist;
    mapping(address => uint) public deposits;
    mapping(address => uint) public lastClaimTimestamp;

    constructor(address maiTokenAddress, address busdTokenAddress)
    {
        maiToken = IERC20(maiTokenAddress);
        busdToken = IERC20(busdTokenAddress);
    }

    // Admin

    function enablePublicSale() public onlyOwner
    {
        require(!isPublicSaleActive, "Public sale is already active.");
        isPublicSaleActive = true;
    }

    function enableClaim() public onlyOwner
    {
        require(!isClaimActive, "Claim is already active.");
        isClaimActive = true;
        claimGenesisTimestamp = block.timestamp;
    }

    function editWhitelist(address[] memory addresses, bool value) public onlyOwner
    {
        for(uint i; i < addresses.length; i++){
            whitelist[addresses[i]] = value;
        }
    }

    // Public functions

    function deposit(uint amount_busd) public {
        require(deposits[msg.sender] + amount_busd < MAX_WALLET, "Max per wallet exceeded.");
        require(totalDeposited + amount_busd < MAX_TOTAL, "Sale maximum exceeded.");
        require(!isClaimActive, "Sale period is over.");
        require(isPublicSaleActive || whitelist[msg.sender], "You can't participate in this presale");
        deposits[msg.sender] += amount_busd;
        totalDeposited += amount_busd;
        busdToken.transferFrom(msg.sender, address(this), amount_busd);
    }

    function calculcateClaim(address participant) public view returns(uint)
    {
        if(!isClaimActive)
            return 0;

        uint claim_period_begin = lastClaimTimestamp[participant];

        if(claim_period_begin == 0)
        {
            claim_period_begin = claimGenesisTimestamp;
        }
        uint claim_period_end = block.timestamp;
        if(claim_period_end > claimGenesisTimestamp + TIMELOCK_DURATION)
        {
            claim_period_end = claimGenesisTimestamp + TIMELOCK_DURATION;
        }
        uint claim_period = claim_period_end - claim_period_begin;
        return (claim_period * deposits[participant]) / TIMELOCK_DURATION;
    }

    function claim() public {
        require(isClaimActive, "Claim is not active.");
        require(lastClaimTimestamp[msg.sender] <= claimGenesisTimestamp + TIMELOCK_DURATION, "You already claimed all your tokens.");
        uint claim_amount = calculcateClaim(msg.sender);
        lastClaimTimestamp[msg.sender] = block.timestamp;
        maiToken.transfer(msg.sender, claim_amount);
    }
}

PresaleABI.JSON

[
	{
		"inputs": [],
		"name": "claim",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "amount_busd",
				"type": "uint256"
			}
		],
		"name": "deposit",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address[]",
				"name": "addresses",
				"type": "address[]"
			},
			{
				"internalType": "bool",
				"name": "value",
				"type": "bool"
			}
		],
		"name": "editWhitelist",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "enableClaim",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "enablePublicSale",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "renounceOwnership",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "maiTokenAddress",
				"type": "address"
			},
			{
				"internalType": "address",
				"name": "busdTokenAddress",
				"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": "address",
				"name": "newOwner",
				"type": "address"
			}
		],
		"name": "transferOwnership",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "busdToken",
		"outputs": [
			{
				"internalType": "contract IERC20",
				"name": "",
				"type": "address"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "participant",
				"type": "address"
			}
		],
		"name": "calculcateClaim",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "claimGenesisTimestamp",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "",
				"type": "address"
			}
		],
		"name": "deposits",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "isClaimActive",
		"outputs": [
			{
				"internalType": "bool",
				"name": "",
				"type": "bool"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "isPublicSaleActive",
		"outputs": [
			{
				"internalType": "bool",
				"name": "",
				"type": "bool"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "",
				"type": "address"
			}
		],
		"name": "lastClaimTimestamp",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "maiToken",
		"outputs": [
			{
				"internalType": "contract IERC20",
				"name": "",
				"type": "address"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "MAX_TOTAL",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "MAX_WALLET",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "owner",
		"outputs": [
			{
				"internalType": "address",
				"name": "",
				"type": "address"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "RATE",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "TIMELOCK_DURATION",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "totalDeposited",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "address",
				"name": "",
				"type": "address"
			}
		],
		"name": "whitelist",
		"outputs": [
			{
				"internalType": "bool",
				"name": "",
				"type": "bool"
			}
		],
		"stateMutability": "view",
		"type": "function"
	}
]

BUSD (Test): 0xCa2bDAa8a57f679F05277c5331bAf6F73E8AE935
MAI (Test): 0x2aF56cb68BE0B92222Ff36e8A1E918E56A758903
Presale: 0xc25702B0C79B84967722427A0903EFE5D6e7197C