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Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- YieldFlare
- Optimization enabled
- true
- Compiler version
- v0.8.9+commit.e5eed63a
- Optimization runs
- 200
- EVM Version
- default
- Verified at
- 2022-01-04T07:15:14.850270Z
Contract source code
// SPDX-License-Identifier: MIT
pragma solidity =0.8.9;
interface IFRC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function allowance(address owner, address spender) external view returns (uint256);
function approve(address spender, uint256 amount) external returns (bool);
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
function increaseAllowance(address spender, uint256 addedValue) external returns (bool);
function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
Uniswap's Ownable contract fork (commit 0db76e9):
remove using Context, add two step ownership verification
https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol
*/
abstract contract Ownable {
address internal _owner;
address internal _newOwner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor (address ownerAddress) {
require(ownerAddress != address(0), "Ownable: zero address");
_owner = ownerAddress;
emit OwnershipTransferred(address(0), ownerAddress);
}
function owner() public view virtual returns (address) {
return _owner;
}
function newOwner() public view virtual returns (address) {
return _newOwner;
}
modifier onlyOwner() {
require(owner() == msg.sender, "Ownable: caller is not the owner");
_;
}
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
function transferOwnership(address transferOwner) public onlyOwner {
require(transferOwner != newOwner());
_newOwner = transferOwner;
}
function acceptOwnership() virtual public {
require(msg.sender == newOwner(), "Ownable: caller is not the new owner");
emit OwnershipTransferred(_owner, _newOwner);
_owner = _newOwner;
_newOwner = address(0);
}
}
abstract contract YieldFlareStorage is Ownable {
mapping (address => uint256) internal _balances;
mapping (address => mapping (address => uint256)) internal _allowances;
mapping (address => bool) internal _frozen;
uint256 internal _totalSupply = 110000000 * 1e18;
string internal _name = "Experimental Finance Token";
string internal _symbol = "EXFI";
uint8 internal _decimals = 18;
uint public minSendInterval;
uint public maxSendAmount;
mapping (address => uint) public userLastTransfer;
// keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
mapping(address => uint) public nonces;
event FreezeAccount (address indexed account);
event UnfreezeAccount (address indexed account);
event UpdateMinSendInterval(uint indexed previousMinSendInterval, uint indexed newMinSendInterval);
event UpdateMaxSendAmount(uint indexed previousMaxSendAmount, uint indexed newMaxSendAmount);
constructor(address _owner) Ownable(_owner) { }
}
interface IFRC20Permit {
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
}
contract YieldFlare is YieldFlareStorage, IFRC20, IFRC20Permit {
address public target;
constructor () YieldFlareStorage (address(0x1)) { }
function initialize(address receiver) external {
_balances[receiver] = _totalSupply;
emit Transfer(address(0), receiver, _totalSupply);
}
function DOMAIN_SEPARATOR() public view returns (bytes32) {
uint chainId;
assembly {
chainId := chainid()
}
return keccak256(
abi.encode(
keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
keccak256(bytes(_name)),
keccak256(bytes('1')),
chainId,
address(this)
)
);
}
function name() external view override returns (string memory) {
return _name;
}
function symbol() external view override returns (string memory) {
return _symbol;
}
function decimals() external view override returns (uint8) {
return _decimals;
}
function totalSupply() external view override returns (uint256) {
return _totalSupply;
}
function balanceOf(address account) external view override returns (uint256) {
return _balances[account];
}
function isFrozen(address account) public view returns (bool) {
return _frozen[account];
}
function transfer(address recipient, uint256 amount) external override returns (bool) {
_transfer(msg.sender, recipient, amount);
return true;
}
function allowance(address owner, address spender) public view override returns (uint256) {
return _allowances[owner][spender];
}
function approve(address spender, uint256 amount) external override returns (bool) {
_approve(msg.sender, spender, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
_transfer(sender, recipient, amount);
uint allowed = _allowances[sender][msg.sender];
require(allowed >= amount, "EXFI: Transfer amount exceeds allowance");
if (allowed < type(uint).max) {
_approve(sender, msg.sender, allowed - amount);
}
return true;
}
function increaseAllowance(address spender, uint256 addedValue) external override returns (bool) {
_approve(msg.sender, spender, _allowances[msg.sender][spender] + addedValue);
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) external override returns (bool) {
_approve(msg.sender, spender, _allowances[msg.sender][spender] - subtractedValue);
return true;
}
function burn(uint256 amount) external {
_burn(msg.sender, amount);
}
function burnFrom(address account, uint256 amount) external {
uint256 currentAllowance = allowance(account, msg.sender);
require(currentAllowance >= amount, "EXFI: Burn amount exceeds allowance");
unchecked {
_approve(account, msg.sender, currentAllowance - amount);
}
_burn(account, amount);
}
function _transfer(address sender, address recipient, uint256 amount) internal {
require(sender != address(0), "EXFI: Transfer from the zero address");
require(recipient != address(0), "EXFI: Transfer to the zero address");
require(!isFrozen(sender), "EXFI: Sender's account is frozen");
require(!isFrozen(recipient), "EXFI: Recipient's account is frozen");
require(_balances[sender] >= amount, "EXFI: Transfer exceeds balance");
if (maxSendAmount > 0) {
require(amount <= maxSendAmount, "EXFI: Transfer amount exceeds allowed transfer");
}
if (minSendInterval > 0) {
require(userLastTransfer[sender] + minSendInterval >= block.timestamp, "EXFI: Allowed transfer interval hasn't passed yet");
userLastTransfer[sender] = block.timestamp; //don't update userLastTransfer if minSendInterval is 0
}
unchecked {
_balances[sender] -= amount;
_balances[recipient] += amount;
}
emit Transfer(sender, recipient, amount);
}
function _approve(address owner, address spender, uint256 amount) internal {
require(owner != address(0), "EXFI: Approve from the zero address");
require(spender != address(0), "EXFI: Approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "EXFI: Burn from the zero address");
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "EXFI: Burn amount exceeds balance");
unchecked {
_balances[account] = accountBalance - amount;
}
_totalSupply -= amount;
emit Transfer(account, address(0), amount);
}
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external override {
require(deadline >= block.timestamp, 'EXFI: Expired');
bytes32 digest = keccak256(
abi.encodePacked(
'\x19\x01',
DOMAIN_SEPARATOR(),
keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
)
);
address recoveredAddress = ecrecover(digest, v, r, s);
require(recoveredAddress != address(0) && recoveredAddress == owner, 'EXFI: invalid signature');
_approve(owner, spender, value);
}
function freezeAccount(address account) onlyOwner external {
require(!_frozen[account], "EXFI: Has been frozen");
_frozen[account] = true;
emit FreezeAccount(account);
}
function unfreezeAccount(address account) onlyOwner external {
require(_frozen[account], "EXFI: Has been unfrozen");
_frozen[account] = false;
emit UnfreezeAccount(account);
}
function updateMinSendInterval(uint newMinSendInterval) onlyOwner external {
//newMinSendInterval can be zero, no need for checking value
emit UpdateMinSendInterval(minSendInterval, newMinSendInterval);
minSendInterval = newMinSendInterval;
}
function updateMaxSendAmount(uint newMaxSendAmount) onlyOwner external {
//newMaxSendAmount can be zero, no need for checking value
emit UpdateMinSendInterval(maxSendAmount, newMaxSendAmount);
maxSendAmount = newMaxSendAmount;
}
}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[]},{"type":"event","name":"Approval","inputs":[{"type":"address","name":"owner","internalType":"address","indexed":true},{"type":"address","name":"spender","internalType":"address","indexed":true},{"type":"uint256","name":"value","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"FreezeAccount","inputs":[{"type":"address","name":"account","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Transfer","inputs":[{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":true},{"type":"uint256","name":"value","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"UnfreezeAccount","inputs":[{"type":"address","name":"account","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"UpdateMaxSendAmount","inputs":[{"type":"uint256","name":"previousMaxSendAmount","internalType":"uint256","indexed":true},{"type":"uint256","name":"newMaxSendAmount","internalType":"uint256","indexed":true}],"anonymous":false},{"type":"event","name":"UpdateMinSendInterval","inputs":[{"type":"uint256","name":"previousMinSendInterval","internalType":"uint256","indexed":true},{"type":"uint256","name":"newMinSendInterval","internalType":"uint256","indexed":true}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"DOMAIN_SEPARATOR","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"PERMIT_TYPEHASH","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"acceptOwnership","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"allowance","inputs":[{"type":"address","name":"owner","internalType":"address"},{"type":"address","name":"spender","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"approve","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"balanceOf","inputs":[{"type":"address","name":"account","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"burn","inputs":[{"type":"uint256","name":"amount","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"burnFrom","inputs":[{"type":"address","name":"account","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint8","name":"","internalType":"uint8"}],"name":"decimals","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"decreaseAllowance","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"subtractedValue","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"freezeAccount","inputs":[{"type":"address","name":"account","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"increaseAllowance","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"addedValue","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"initialize","inputs":[{"type":"address","name":"receiver","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isFrozen","inputs":[{"type":"address","name":"account","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"maxSendAmount","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"minSendInterval","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"name","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"newOwner","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"nonces","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"permit","inputs":[{"type":"address","name":"owner","internalType":"address"},{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"},{"type":"uint256","name":"deadline","internalType":"uint256"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"renounceOwnership","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"symbol","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"target","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalSupply","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"transfer","inputs":[{"type":"address","name":"recipient","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"transferFrom","inputs":[{"type":"address","name":"sender","internalType":"address"},{"type":"address","name":"recipient","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"transferOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"unfreezeAccount","inputs":[{"type":"address","name":"account","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateMaxSendAmount","inputs":[{"type":"uint256","name":"newMaxSendAmount","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateMinSendInterval","inputs":[{"type":"uint256","name":"newMinSendInterval","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"userLastTransfer","inputs":[{"type":"address","name":"","internalType":"address"}]}]
Contract Creation Code
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