Feature Tip: Add private address tag to any address under My Name Tag !
ERC-20
Overview
Max Total Supply
31,946,040.151 sPAID
Holders
718
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
SPAID
Compiler Version
v0.8.19+commit.7dd6d404
Optimization Enabled:
Yes with 200 runs
Other Settings:
paris EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: UNLICENSED pragma solidity 0.8.19; import {ERC20} from "../../lib/solady/src/tokens/ERC20.sol"; import {Ownable} from "../../lib/solady/src/auth/Ownable.sol"; import {SafeERC20} from "../../lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol"; import {IERC20} from "../../lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol"; contract SPAID is ERC20, Ownable { using SafeERC20 for IERC20; /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* CUSTOM ERRORS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Zero address is not allowed. error ZeroAddressNotAllowed(); /// @dev The caller provided amount is out of range. error InvalidAmount(); /// @dev The caller provided tax amount is out of range. error InvalidTaxAmount(); /// @dev There is not enough PAID tokens for transfer. error InsufficientPAIDBalance(); /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* EVENTS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Tax was updated to `amount` by `owner`. /// This event is emitted anytime `setTax` is called by the `owner`. event TaxUpdated(address indexed owner, uint256 amount); /// @dev Treasury wallet was updated to `treasuryAddress` by `owner`. /// This event is emitted anytime `setTreasury` is called by the `owner`. event TreasuryUpdated(address indexed owner, address treasuryAddress); /// @dev A deposit of `amount` was made by `user`. /// This event is emitted anytime a `deposit` is made by a user. event Deposit(address indexed user, uint256 amount); /// @dev A withdraw of `amount` was made by `user`. /// This event is emitted anytime a `withdraw` is made by a user. event Withdraw(address indexed user, uint256 amount); /// @dev All staked PAID tokens of `amount` was withdrawn by /// `user`, which will be the owner. /// /// This event is emitted anytime `withdrawAllStaked` is called /// by the owner. event WithdrawStakedPAID(address indexed user, uint256 amount); /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* STORAGE */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev `tokenPAID` points to the PAID token. /// Provided in constructor. /// /// *Immutable* IERC20 public immutable tokenPAID; /// @dev `treasury` points to the current treasury wallet. /// Provided in constructor. /// /// Can be updated by using `setTreasury` function. address public treasury; /// @dev `tax` is the current tax amount. /// Provided in constructor. /// /// Can be updated by using `setTax` function. uint8 public tax; /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* CONSTRUCTOR */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Intialize new SPAID contract with the following params: /// `tokenPAID_` - address of PAID token /// `treasury_` - The address of the treasury wallet. /// All `tax` will go to this wallet. /// `tax_` - The amount of tax to add on deposit or subtract on withdraw. constructor(address tokenPAID_, address treasury_, uint8 tax_) { if (tokenPAID_ == address(0)) { revert ZeroAddressNotAllowed(); } if (treasury_ == address(0)) { revert ZeroAddressNotAllowed(); } if (tax_ == 0 || tax_ > 10) { revert InvalidTaxAmount(); } _initializeOwner(msg.sender); tokenPAID = IERC20(tokenPAID_); tax = tax_; treasury = treasury_; } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* PUBLIC/EXTERNAL FUNCTIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Sets `tax_` as the new tax amount for deposit and withdraws. /// `_tax` must be in a range of 1 - 10. function setTax(uint8 tax_) external onlyOwner { if (tax_ == 0 || tax_ > 10) { revert InvalidTaxAmount(); } tax = tax_; emit TaxUpdated(msg.sender, tax_); } /// @dev Sets `treasury_` as the new treasury wallet address for taxes. function setTreasury(address treasury_) external onlyOwner { if (treasury_ == address(0)) { revert ZeroAddressNotAllowed(); } treasury = treasury_; emit TreasuryUpdated(msg.sender, treasury_); } /// @dev Returns the `name` of the token. function name() public view virtual override returns (string memory) { return "Staked PAID"; } /// @dev Returns the `symbol` of the token. function symbol() public view virtual override returns (string memory) { return "sPAID"; } /// @dev Deposit `amount` of PAID tokens and mint same amount in `sPAID` token. /// The total transfer will be `amount` + (`amount` * `tax`). /// /// Emits a {Deposit} event. function deposit(uint256 amount) external { if (amount == 0) { revert InvalidAmount(); } uint256 fee = amount * tax / 100; if (tokenPAID.balanceOf(msg.sender) < amount + fee) { revert InsufficientPAIDBalance(); } tokenPAID.safeTransferFrom(msg.sender, treasury, fee); tokenPAID.safeTransferFrom(msg.sender, address(this), amount); _mint(msg.sender, amount); emit Deposit(msg.sender, amount); } /// @dev Withdraw `amount` of PAID tokens and burn same amount of `sPAID` tokens /// The amount being withdrawn will have `tax` deducted. /// /// Emits a {Withdraw} event. function withdraw(uint256 amount) external { if (amount == 0) { revert InvalidAmount(); } if (tokenPAID.balanceOf(address(this)) < amount) { revert InsufficientPAIDBalance(); } uint256 fee = amount * tax / 100; tokenPAID.safeTransfer(treasury, fee); tokenPAID.safeTransfer(msg.sender, amount - fee); _burn(msg.sender, amount); emit Withdraw(msg.sender, amount); } /// @dev Withdraw all currently staked PAID tokens in the contract. /// /// Emits a {WithdrawStakedPAID} event. function withdrawAllStaked() external onlyOwner { uint256 paidBalance = tokenPAID.balanceOf(address(this)); if (paidBalance == 0) { revert InsufficientPAIDBalance(); } tokenPAID.safeTransfer(msg.sender, paidBalance); emit WithdrawStakedPAID(msg.sender, paidBalance); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.4; /// @notice Simple ERC20 + EIP-2612 implementation. /// @author Solady (https://github.com/vectorized/solady/blob/main/src/tokens/ERC20.sol) /// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol) /// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol) /// /// @dev Note: /// - The ERC20 standard allows minting and transferring to and from the zero address, /// minting and transferring zero tokens, as well as self-approvals. /// For performance, this implementation WILL NOT revert for such actions. /// Please add any checks with overrides if desired. /// - The `permit` function uses the ecrecover precompile (0x1). /// /// If you are overriding: /// - NEVER violate the ERC20 invariant: /// the total sum of all balances must be equal to `totalSupply()`. /// - Check that the overridden function is actually used in the function you want to /// change the behavior of. Much of the code has been manually inlined for performance. abstract contract ERC20 { /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* CUSTOM ERRORS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev The total supply has overflowed. error TotalSupplyOverflow(); /// @dev The allowance has overflowed. error AllowanceOverflow(); /// @dev The allowance has underflowed. error AllowanceUnderflow(); /// @dev Insufficient balance. error InsufficientBalance(); /// @dev Insufficient allowance. error InsufficientAllowance(); /// @dev The permit is invalid. error InvalidPermit(); /// @dev The permit has expired. error PermitExpired(); /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* EVENTS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Emitted when `amount` tokens is transferred from `from` to `to`. event Transfer(address indexed from, address indexed to, uint256 amount); /// @dev Emitted when `amount` tokens is approved by `owner` to be used by `spender`. event Approval(address indexed owner, address indexed spender, uint256 amount); /// @dev `keccak256(bytes("Transfer(address,address,uint256)"))`. uint256 private constant _TRANSFER_EVENT_SIGNATURE = 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef; /// @dev `keccak256(bytes("Approval(address,address,uint256)"))`. uint256 private constant _APPROVAL_EVENT_SIGNATURE = 0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925; /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* STORAGE */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev The storage slot for the total supply. uint256 private constant _TOTAL_SUPPLY_SLOT = 0x05345cdf77eb68f44c; /// @dev The balance slot of `owner` is given by: /// ``` /// mstore(0x0c, _BALANCE_SLOT_SEED) /// mstore(0x00, owner) /// let balanceSlot := keccak256(0x0c, 0x20) /// ``` uint256 private constant _BALANCE_SLOT_SEED = 0x87a211a2; /// @dev The allowance slot of (`owner`, `spender`) is given by: /// ``` /// mstore(0x20, spender) /// mstore(0x0c, _ALLOWANCE_SLOT_SEED) /// mstore(0x00, owner) /// let allowanceSlot := keccak256(0x0c, 0x34) /// ``` uint256 private constant _ALLOWANCE_SLOT_SEED = 0x7f5e9f20; /// @dev The nonce slot of `owner` is given by: /// ``` /// mstore(0x0c, _NONCES_SLOT_SEED) /// mstore(0x00, owner) /// let nonceSlot := keccak256(0x0c, 0x20) /// ``` uint256 private constant _NONCES_SLOT_SEED = 0x38377508; /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* CONSTANTS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev `(_NONCES_SLOT_SEED << 16) | 0x1901`. uint256 private constant _NONCES_SLOT_SEED_WITH_SIGNATURE_PREFIX = 0x383775081901; /// @dev `keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")`. bytes32 private constant _DOMAIN_TYPEHASH = 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f; /// @dev `keccak256("1")`. bytes32 private constant _VERSION_HASH = 0xc89efdaa54c0f20c7adf612882df0950f5a951637e0307cdcb4c672f298b8bc6; /// @dev `keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)")`. bytes32 private constant _PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9; /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* ERC20 METADATA */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Returns the name of the token. function name() public view virtual returns (string memory); /// @dev Returns the symbol of the token. function symbol() public view virtual returns (string memory); /// @dev Returns the decimals places of the token. function decimals() public view virtual returns (uint8) { return 18; } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* ERC20 */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Returns the amount of tokens in existence. function totalSupply() public view virtual returns (uint256 result) { /// @solidity memory-safe-assembly assembly { result := sload(_TOTAL_SUPPLY_SLOT) } } /// @dev Returns the amount of tokens owned by `owner`. function balanceOf(address owner) public view virtual returns (uint256 result) { /// @solidity memory-safe-assembly assembly { mstore(0x0c, _BALANCE_SLOT_SEED) mstore(0x00, owner) result := sload(keccak256(0x0c, 0x20)) } } /// @dev Returns the amount of tokens that `spender` can spend on behalf of `owner`. function allowance(address owner, address spender) public view virtual returns (uint256 result) { /// @solidity memory-safe-assembly assembly { mstore(0x20, spender) mstore(0x0c, _ALLOWANCE_SLOT_SEED) mstore(0x00, owner) result := sload(keccak256(0x0c, 0x34)) } } /// @dev Sets `amount` as the allowance of `spender` over the caller's tokens. /// /// Emits a {Approval} event. function approve(address spender, uint256 amount) public virtual returns (bool) { /// @solidity memory-safe-assembly assembly { // Compute the allowance slot and store the amount. mstore(0x20, spender) mstore(0x0c, _ALLOWANCE_SLOT_SEED) mstore(0x00, caller()) sstore(keccak256(0x0c, 0x34), amount) // Emit the {Approval} event. mstore(0x00, amount) log3(0x00, 0x20, _APPROVAL_EVENT_SIGNATURE, caller(), shr(96, mload(0x2c))) } return true; } /// @dev Transfer `amount` tokens from the caller to `to`. /// /// Requirements: /// - `from` must at least have `amount`. /// /// Emits a {Transfer} event. function transfer(address to, uint256 amount) public virtual returns (bool) { _beforeTokenTransfer(msg.sender, to, amount); /// @solidity memory-safe-assembly assembly { // Compute the balance slot and load its value. mstore(0x0c, _BALANCE_SLOT_SEED) mstore(0x00, caller()) let fromBalanceSlot := keccak256(0x0c, 0x20) let fromBalance := sload(fromBalanceSlot) // Revert if insufficient balance. if gt(amount, fromBalance) { mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`. revert(0x1c, 0x04) } // Subtract and store the updated balance. sstore(fromBalanceSlot, sub(fromBalance, amount)) // Compute the balance slot of `to`. mstore(0x00, to) let toBalanceSlot := keccak256(0x0c, 0x20) // Add and store the updated balance of `to`. // Will not overflow because the sum of all user balances // cannot exceed the maximum uint256 value. sstore(toBalanceSlot, add(sload(toBalanceSlot), amount)) // Emit the {Transfer} event. mstore(0x20, amount) log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, caller(), shr(96, mload(0x0c))) } _afterTokenTransfer(msg.sender, to, amount); return true; } /// @dev Transfers `amount` tokens from `from` to `to`. /// /// Note: Does not update the allowance if it is the maximum uint256 value. /// /// Requirements: /// - `from` must at least have `amount`. /// - The caller must have at least `amount` of allowance to transfer the tokens of `from`. /// /// Emits a {Transfer} event. function transferFrom(address from, address to, uint256 amount) public virtual returns (bool) { _beforeTokenTransfer(from, to, amount); /// @solidity memory-safe-assembly assembly { let from_ := shl(96, from) // Compute the allowance slot and load its value. mstore(0x20, caller()) mstore(0x0c, or(from_, _ALLOWANCE_SLOT_SEED)) let allowanceSlot := keccak256(0x0c, 0x34) let allowance_ := sload(allowanceSlot) // If the allowance is not the maximum uint256 value. if add(allowance_, 1) { // Revert if the amount to be transferred exceeds the allowance. if gt(amount, allowance_) { mstore(0x00, 0x13be252b) // `InsufficientAllowance()`. revert(0x1c, 0x04) } // Subtract and store the updated allowance. sstore(allowanceSlot, sub(allowance_, amount)) } // Compute the balance slot and load its value. mstore(0x0c, or(from_, _BALANCE_SLOT_SEED)) let fromBalanceSlot := keccak256(0x0c, 0x20) let fromBalance := sload(fromBalanceSlot) // Revert if insufficient balance. if gt(amount, fromBalance) { mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`. revert(0x1c, 0x04) } // Subtract and store the updated balance. sstore(fromBalanceSlot, sub(fromBalance, amount)) // Compute the balance slot of `to`. mstore(0x00, to) let toBalanceSlot := keccak256(0x0c, 0x20) // Add and store the updated balance of `to`. // Will not overflow because the sum of all user balances // cannot exceed the maximum uint256 value. sstore(toBalanceSlot, add(sload(toBalanceSlot), amount)) // Emit the {Transfer} event. mstore(0x20, amount) log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, from_), shr(96, mload(0x0c))) } _afterTokenTransfer(from, to, amount); return true; } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* EIP-2612 */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev For more performance, override to return the constant value /// of `keccak256(bytes(name()))` if `name()` will never change. function _constantNameHash() internal view virtual returns (bytes32 result) {} /// @dev Returns the current nonce for `owner`. /// This value is used to compute the signature for EIP-2612 permit. function nonces(address owner) public view virtual returns (uint256 result) { /// @solidity memory-safe-assembly assembly { // Compute the nonce slot and load its value. mstore(0x0c, _NONCES_SLOT_SEED) mstore(0x00, owner) result := sload(keccak256(0x0c, 0x20)) } } /// @dev Sets `value` as the allowance of `spender` over the tokens of `owner`, /// authorized by a signed approval by `owner`. /// /// Emits a {Approval} event. function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public virtual { bytes32 nameHash = _constantNameHash(); // We simply calculate it on-the-fly to allow for cases where the `name` may change. if (nameHash == bytes32(0)) nameHash = keccak256(bytes(name())); /// @solidity memory-safe-assembly assembly { // Revert if the block timestamp is greater than `deadline`. if gt(timestamp(), deadline) { mstore(0x00, 0x1a15a3cc) // `PermitExpired()`. revert(0x1c, 0x04) } let m := mload(0x40) // Grab the free memory pointer. // Clean the upper 96 bits. owner := shr(96, shl(96, owner)) spender := shr(96, shl(96, spender)) // Compute the nonce slot and load its value. mstore(0x0e, _NONCES_SLOT_SEED_WITH_SIGNATURE_PREFIX) mstore(0x00, owner) let nonceSlot := keccak256(0x0c, 0x20) let nonceValue := sload(nonceSlot) // Prepare the domain separator. mstore(m, _DOMAIN_TYPEHASH) mstore(add(m, 0x20), nameHash) mstore(add(m, 0x40), _VERSION_HASH) mstore(add(m, 0x60), chainid()) mstore(add(m, 0x80), address()) mstore(0x2e, keccak256(m, 0xa0)) // Prepare the struct hash. mstore(m, _PERMIT_TYPEHASH) mstore(add(m, 0x20), owner) mstore(add(m, 0x40), spender) mstore(add(m, 0x60), value) mstore(add(m, 0x80), nonceValue) mstore(add(m, 0xa0), deadline) mstore(0x4e, keccak256(m, 0xc0)) // Prepare the ecrecover calldata. mstore(0x00, keccak256(0x2c, 0x42)) mstore(0x20, and(0xff, v)) mstore(0x40, r) mstore(0x60, s) let t := staticcall(gas(), 1, 0, 0x80, 0x20, 0x20) // If the ecrecover fails, the returndatasize will be 0x00, // `owner` will be checked if it equals the hash at 0x00, // which evaluates to false (i.e. 0), and we will revert. // If the ecrecover succeeds, the returndatasize will be 0x20, // `owner` will be compared against the returned address at 0x20. if iszero(eq(mload(returndatasize()), owner)) { mstore(0x00, 0xddafbaef) // `InvalidPermit()`. revert(0x1c, 0x04) } // Increment and store the updated nonce. sstore(nonceSlot, add(nonceValue, t)) // `t` is 1 if ecrecover succeeds. // Compute the allowance slot and store the value. // The `owner` is already at slot 0x20. mstore(0x40, or(shl(160, _ALLOWANCE_SLOT_SEED), spender)) sstore(keccak256(0x2c, 0x34), value) // Emit the {Approval} event. log3(add(m, 0x60), 0x20, _APPROVAL_EVENT_SIGNATURE, owner, spender) mstore(0x40, m) // Restore the free memory pointer. mstore(0x60, 0) // Restore the zero pointer. } } /// @dev Returns the EIP-712 domain separator for the EIP-2612 permit. function DOMAIN_SEPARATOR() public view virtual returns (bytes32 result) { bytes32 nameHash = _constantNameHash(); // We simply calculate it on-the-fly to allow for cases where the `name` may change. if (nameHash == bytes32(0)) nameHash = keccak256(bytes(name())); /// @solidity memory-safe-assembly assembly { let m := mload(0x40) // Grab the free memory pointer. mstore(m, _DOMAIN_TYPEHASH) mstore(add(m, 0x20), nameHash) mstore(add(m, 0x40), _VERSION_HASH) mstore(add(m, 0x60), chainid()) mstore(add(m, 0x80), address()) result := keccak256(m, 0xa0) } } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* INTERNAL MINT FUNCTIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Mints `amount` tokens to `to`, increasing the total supply. /// /// Emits a {Transfer} event. function _mint(address to, uint256 amount) internal virtual { _beforeTokenTransfer(address(0), to, amount); /// @solidity memory-safe-assembly assembly { let totalSupplyBefore := sload(_TOTAL_SUPPLY_SLOT) let totalSupplyAfter := add(totalSupplyBefore, amount) // Revert if the total supply overflows. if lt(totalSupplyAfter, totalSupplyBefore) { mstore(0x00, 0xe5cfe957) // `TotalSupplyOverflow()`. revert(0x1c, 0x04) } // Store the updated total supply. sstore(_TOTAL_SUPPLY_SLOT, totalSupplyAfter) // Compute the balance slot and load its value. mstore(0x0c, _BALANCE_SLOT_SEED) mstore(0x00, to) let toBalanceSlot := keccak256(0x0c, 0x20) // Add and store the updated balance. sstore(toBalanceSlot, add(sload(toBalanceSlot), amount)) // Emit the {Transfer} event. mstore(0x20, amount) log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, 0, shr(96, mload(0x0c))) } _afterTokenTransfer(address(0), to, amount); } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* INTERNAL BURN FUNCTIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Burns `amount` tokens from `from`, reducing the total supply. /// /// Emits a {Transfer} event. function _burn(address from, uint256 amount) internal virtual { _beforeTokenTransfer(from, address(0), amount); /// @solidity memory-safe-assembly assembly { // Compute the balance slot and load its value. mstore(0x0c, _BALANCE_SLOT_SEED) mstore(0x00, from) let fromBalanceSlot := keccak256(0x0c, 0x20) let fromBalance := sload(fromBalanceSlot) // Revert if insufficient balance. if gt(amount, fromBalance) { mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`. revert(0x1c, 0x04) } // Subtract and store the updated balance. sstore(fromBalanceSlot, sub(fromBalance, amount)) // Subtract and store the updated total supply. sstore(_TOTAL_SUPPLY_SLOT, sub(sload(_TOTAL_SUPPLY_SLOT), amount)) // Emit the {Transfer} event. mstore(0x00, amount) log3(0x00, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, shl(96, from)), 0) } _afterTokenTransfer(from, address(0), amount); } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* INTERNAL TRANSFER FUNCTIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Moves `amount` of tokens from `from` to `to`. function _transfer(address from, address to, uint256 amount) internal virtual { _beforeTokenTransfer(from, to, amount); /// @solidity memory-safe-assembly assembly { let from_ := shl(96, from) // Compute the balance slot and load its value. mstore(0x0c, or(from_, _BALANCE_SLOT_SEED)) let fromBalanceSlot := keccak256(0x0c, 0x20) let fromBalance := sload(fromBalanceSlot) // Revert if insufficient balance. if gt(amount, fromBalance) { mstore(0x00, 0xf4d678b8) // `InsufficientBalance()`. revert(0x1c, 0x04) } // Subtract and store the updated balance. sstore(fromBalanceSlot, sub(fromBalance, amount)) // Compute the balance slot of `to`. mstore(0x00, to) let toBalanceSlot := keccak256(0x0c, 0x20) // Add and store the updated balance of `to`. // Will not overflow because the sum of all user balances // cannot exceed the maximum uint256 value. sstore(toBalanceSlot, add(sload(toBalanceSlot), amount)) // Emit the {Transfer} event. mstore(0x20, amount) log3(0x20, 0x20, _TRANSFER_EVENT_SIGNATURE, shr(96, from_), shr(96, mload(0x0c))) } _afterTokenTransfer(from, to, amount); } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* INTERNAL ALLOWANCE FUNCTIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Updates the allowance of `owner` for `spender` based on spent `amount`. function _spendAllowance(address owner, address spender, uint256 amount) internal virtual { /// @solidity memory-safe-assembly assembly { // Compute the allowance slot and load its value. mstore(0x20, spender) mstore(0x0c, _ALLOWANCE_SLOT_SEED) mstore(0x00, owner) let allowanceSlot := keccak256(0x0c, 0x34) let allowance_ := sload(allowanceSlot) // If the allowance is not the maximum uint256 value. if add(allowance_, 1) { // Revert if the amount to be transferred exceeds the allowance. if gt(amount, allowance_) { mstore(0x00, 0x13be252b) // `InsufficientAllowance()`. revert(0x1c, 0x04) } // Subtract and store the updated allowance. sstore(allowanceSlot, sub(allowance_, amount)) } } } /// @dev Sets `amount` as the allowance of `spender` over the tokens of `owner`. /// /// Emits a {Approval} event. function _approve(address owner, address spender, uint256 amount) internal virtual { /// @solidity memory-safe-assembly assembly { let owner_ := shl(96, owner) // Compute the allowance slot and store the amount. mstore(0x20, spender) mstore(0x0c, or(owner_, _ALLOWANCE_SLOT_SEED)) sstore(keccak256(0x0c, 0x34), amount) // Emit the {Approval} event. mstore(0x00, amount) log3(0x00, 0x20, _APPROVAL_EVENT_SIGNATURE, shr(96, owner_), shr(96, mload(0x2c))) } } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* HOOKS TO OVERRIDE */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Hook that is called before any transfer of tokens. /// This includes minting and burning. function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {} /// @dev Hook that is called after any transfer of tokens. /// This includes minting and burning. function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {} }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.4; /// @notice Simple single owner authorization mixin. /// @author Solady (https://github.com/vectorized/solady/blob/main/src/auth/Ownable.sol) /// /// @dev Note: /// This implementation does NOT auto-initialize the owner to `msg.sender`. /// You MUST call the `_initializeOwner` in the constructor / initializer. /// /// While the ownable portion follows /// [EIP-173](https://eips.ethereum.org/EIPS/eip-173) for compatibility, /// the nomenclature for the 2-step ownership handover may be unique to this codebase. abstract contract Ownable { /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* CUSTOM ERRORS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev The caller is not authorized to call the function. error Unauthorized(); /// @dev The `newOwner` cannot be the zero address. error NewOwnerIsZeroAddress(); /// @dev The `pendingOwner` does not have a valid handover request. error NoHandoverRequest(); /// @dev Cannot double-initialize. error AlreadyInitialized(); /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* EVENTS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev The ownership is transferred from `oldOwner` to `newOwner`. /// This event is intentionally kept the same as OpenZeppelin's Ownable to be /// compatible with indexers and [EIP-173](https://eips.ethereum.org/EIPS/eip-173), /// despite it not being as lightweight as a single argument event. event OwnershipTransferred(address indexed oldOwner, address indexed newOwner); /// @dev An ownership handover to `pendingOwner` has been requested. event OwnershipHandoverRequested(address indexed pendingOwner); /// @dev The ownership handover to `pendingOwner` has been canceled. event OwnershipHandoverCanceled(address indexed pendingOwner); /// @dev `keccak256(bytes("OwnershipTransferred(address,address)"))`. uint256 private constant _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE = 0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0; /// @dev `keccak256(bytes("OwnershipHandoverRequested(address)"))`. uint256 private constant _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE = 0xdbf36a107da19e49527a7176a1babf963b4b0ff8cde35ee35d6cd8f1f9ac7e1d; /// @dev `keccak256(bytes("OwnershipHandoverCanceled(address)"))`. uint256 private constant _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE = 0xfa7b8eab7da67f412cc9575ed43464468f9bfbae89d1675917346ca6d8fe3c92; /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* STORAGE */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev The owner slot is given by: /// `bytes32(~uint256(uint32(bytes4(keccak256("_OWNER_SLOT_NOT")))))`. /// It is intentionally chosen to be a high value /// to avoid collision with lower slots. /// The choice of manual storage layout is to enable compatibility /// with both regular and upgradeable contracts. bytes32 internal constant _OWNER_SLOT = 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffff74873927; /// The ownership handover slot of `newOwner` is given by: /// ``` /// mstore(0x00, or(shl(96, user), _HANDOVER_SLOT_SEED)) /// let handoverSlot := keccak256(0x00, 0x20) /// ``` /// It stores the expiry timestamp of the two-step ownership handover. uint256 private constant _HANDOVER_SLOT_SEED = 0x389a75e1; /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* INTERNAL FUNCTIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Override to return true to make `_initializeOwner` prevent double-initialization. function _guardInitializeOwner() internal pure virtual returns (bool guard) {} /// @dev Initializes the owner directly without authorization guard. /// This function must be called upon initialization, /// regardless of whether the contract is upgradeable or not. /// This is to enable generalization to both regular and upgradeable contracts, /// and to save gas in case the initial owner is not the caller. /// For performance reasons, this function will not check if there /// is an existing owner. function _initializeOwner(address newOwner) internal virtual { if (_guardInitializeOwner()) { /// @solidity memory-safe-assembly assembly { let ownerSlot := _OWNER_SLOT if sload(ownerSlot) { mstore(0x00, 0x0dc149f0) // `AlreadyInitialized()`. revert(0x1c, 0x04) } // Clean the upper 96 bits. newOwner := shr(96, shl(96, newOwner)) // Store the new value. sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner)))) // Emit the {OwnershipTransferred} event. log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner) } } else { /// @solidity memory-safe-assembly assembly { // Clean the upper 96 bits. newOwner := shr(96, shl(96, newOwner)) // Store the new value. sstore(_OWNER_SLOT, newOwner) // Emit the {OwnershipTransferred} event. log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner) } } } /// @dev Sets the owner directly without authorization guard. function _setOwner(address newOwner) internal virtual { if (_guardInitializeOwner()) { /// @solidity memory-safe-assembly assembly { let ownerSlot := _OWNER_SLOT // Clean the upper 96 bits. newOwner := shr(96, shl(96, newOwner)) // Emit the {OwnershipTransferred} event. log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner) // Store the new value. sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner)))) } } else { /// @solidity memory-safe-assembly assembly { let ownerSlot := _OWNER_SLOT // Clean the upper 96 bits. newOwner := shr(96, shl(96, newOwner)) // Emit the {OwnershipTransferred} event. log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner) // Store the new value. sstore(ownerSlot, newOwner) } } } /// @dev Throws if the sender is not the owner. function _checkOwner() internal view virtual { /// @solidity memory-safe-assembly assembly { // If the caller is not the stored owner, revert. if iszero(eq(caller(), sload(_OWNER_SLOT))) { mstore(0x00, 0x82b42900) // `Unauthorized()`. revert(0x1c, 0x04) } } } /// @dev Returns how long a two-step ownership handover is valid for in seconds. /// Override to return a different value if needed. /// Made internal to conserve bytecode. Wrap it in a public function if needed. function _ownershipHandoverValidFor() internal view virtual returns (uint64) { return 48 * 3600; } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* PUBLIC UPDATE FUNCTIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Allows the owner to transfer the ownership to `newOwner`. function transferOwnership(address newOwner) public payable virtual onlyOwner { /// @solidity memory-safe-assembly assembly { if iszero(shl(96, newOwner)) { mstore(0x00, 0x7448fbae) // `NewOwnerIsZeroAddress()`. revert(0x1c, 0x04) } } _setOwner(newOwner); } /// @dev Allows the owner to renounce their ownership. function renounceOwnership() public payable virtual onlyOwner { _setOwner(address(0)); } /// @dev Request a two-step ownership handover to the caller. /// The request will automatically expire in 48 hours (172800 seconds) by default. function requestOwnershipHandover() public payable virtual { unchecked { uint256 expires = block.timestamp + _ownershipHandoverValidFor(); /// @solidity memory-safe-assembly assembly { // Compute and set the handover slot to `expires`. mstore(0x0c, _HANDOVER_SLOT_SEED) mstore(0x00, caller()) sstore(keccak256(0x0c, 0x20), expires) // Emit the {OwnershipHandoverRequested} event. log2(0, 0, _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE, caller()) } } } /// @dev Cancels the two-step ownership handover to the caller, if any. function cancelOwnershipHandover() public payable virtual { /// @solidity memory-safe-assembly assembly { // Compute and set the handover slot to 0. mstore(0x0c, _HANDOVER_SLOT_SEED) mstore(0x00, caller()) sstore(keccak256(0x0c, 0x20), 0) // Emit the {OwnershipHandoverCanceled} event. log2(0, 0, _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE, caller()) } } /// @dev Allows the owner to complete the two-step ownership handover to `pendingOwner`. /// Reverts if there is no existing ownership handover requested by `pendingOwner`. function completeOwnershipHandover(address pendingOwner) public payable virtual onlyOwner { /// @solidity memory-safe-assembly assembly { // Compute and set the handover slot to 0. mstore(0x0c, _HANDOVER_SLOT_SEED) mstore(0x00, pendingOwner) let handoverSlot := keccak256(0x0c, 0x20) // If the handover does not exist, or has expired. if gt(timestamp(), sload(handoverSlot)) { mstore(0x00, 0x6f5e8818) // `NoHandoverRequest()`. revert(0x1c, 0x04) } // Set the handover slot to 0. sstore(handoverSlot, 0) } _setOwner(pendingOwner); } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* PUBLIC READ FUNCTIONS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Returns the owner of the contract. function owner() public view virtual returns (address result) { /// @solidity memory-safe-assembly assembly { result := sload(_OWNER_SLOT) } } /// @dev Returns the expiry timestamp for the two-step ownership handover to `pendingOwner`. function ownershipHandoverExpiresAt(address pendingOwner) public view virtual returns (uint256 result) { /// @solidity memory-safe-assembly assembly { // Compute the handover slot. mstore(0x0c, _HANDOVER_SLOT_SEED) mstore(0x00, pendingOwner) // Load the handover slot. result := sload(keccak256(0x0c, 0x20)) } } /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/ /* MODIFIERS */ /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/ /// @dev Marks a function as only callable by the owner. modifier onlyOwner() virtual { _checkOwner(); _; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/IERC20Permit.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; /** * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } /** * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful. */ function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } /** * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 oldAllowance = token.allowance(address(this), spender); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value)); } /** * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. */ function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value)); } } /** * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value, * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval * to be set to zero before setting it to a non-zero value, such as USDT. */ function forceApprove(IERC20 token, address spender, uint256 value) internal { bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value); if (!_callOptionalReturnBool(token, approvalCall)) { _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0)); _callOptionalReturn(token, approvalCall); } } /** * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`. * Revert on invalid signature. */ function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). * * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead. */ function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false // and not revert is the subcall reverts. (bool success, bytes memory returndata) = address(token).call(data); return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. * * ==== Security Considerations * * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be * considered as an intention to spend the allowance in any specific way. The second is that because permits have * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be * generally recommended is: * * ```solidity * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public { * try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {} * doThing(..., value); * } * * function doThing(..., uint256 value) public { * token.safeTransferFrom(msg.sender, address(this), value); * ... * } * ``` * * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also * {SafeERC20-safeTransferFrom}). * * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so * contracts should have entry points that don't rely on permit. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. * * CAUTION: See Security Considerations above. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * * Furthermore, `isContract` will also return true if the target contract within * the same transaction is already scheduled for destruction by `SELFDESTRUCT`, * which only has an effect at the end of a transaction. * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
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Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"result","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"treasury","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawAllStaked","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000001614f18fc94f47967a3fbe5ffcd46d4e7da3d787000000000000000000000000001062f4896bba692ce92309ba02e822b5689db40000000000000000000000000000000000000000000000000000000000000002
-----Decoded View---------------
Arg [0] : tokenPAID_ (address): 0x1614F18Fc94f47967A3Fbe5FfcD46d4e7Da3D787
Arg [1] : treasury_ (address): 0x001062F4896Bba692cE92309Ba02E822b5689Db4
Arg [2] : tax_ (uint8): 2
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000001614f18fc94f47967a3fbe5ffcd46d4e7da3d787
Arg [1] : 000000000000000000000000001062f4896bba692ce92309ba02e822b5689db4
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000002
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