ERC-20
DeFi
Overview
Max Total Supply
58,258.136104486011545185 EEFI
Holders
3,303 (0.00%)
Market
Price
$107.76 @ 0.042494 ETH (+1.39%)
Onchain Market Cap
$6,277,896.75
Circulating Supply Market Cap
$6,277,993.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
0.147068536894053953 EEFIValue
$15.85 ( ~0.00625022409035663 Eth) [0.0003%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
EEFIToken
Compiler Version
v0.7.6+commit.7338295f
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2024-02-23 */ /** *Submitted for verification at Etherscan.io on 2023-09-26 */ // SPDX-License-Identifier: GPL-3.0-or-later // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. pragma solidity 0.7.6; // solhint-disable /** * @dev Reverts if `condition` is false, with a revert reason containing `errorCode`. Only codes up to 999 are * supported. */ function _require(bool condition, uint256 errorCode) pure { if (!condition) _revert(errorCode); } /** * @dev Reverts with a revert reason containing `errorCode`. Only codes up to 999 are supported. */ function _revert(uint256 errorCode) pure { // We're going to dynamically create a revert string based on the error code, with the following format: // 'BAL#{errorCode}' // where the code is left-padded with zeroes to three digits (so they range from 000 to 999). // // We don't have revert strings embedded in the contract to save bytecode size: it takes much less space to store a // number (8 to 16 bits) than the individual string characters. // // The dynamic string creation algorithm that follows could be implemented in Solidity, but assembly allows for a // much denser implementation, again saving bytecode size. Given this function unconditionally reverts, this is a // safe place to rely on it without worrying about how its usage might affect e.g. memory contents. assembly { // First, we need to compute the ASCII representation of the error code. We assume that it is in the 0-999 // range, so we only need to convert three digits. To convert the digits to ASCII, we add 0x30, the value for // the '0' character. let units := add(mod(errorCode, 10), 0x30) errorCode := div(errorCode, 10) let tenths := add(mod(errorCode, 10), 0x30) errorCode := div(errorCode, 10) let hundreds := add(mod(errorCode, 10), 0x30) // With the individual characters, we can now construct the full string. The "BAL#" part is a known constant // (0x42414c23): we simply shift this by 24 (to provide space for the 3 bytes of the error code), and add the // characters to it, each shifted by a multiple of 8. // The revert reason is then shifted left by 200 bits (256 minus the length of the string, 7 characters * 8 bits // per character = 56) to locate it in the most significant part of the 256 slot (the beginning of a byte // array). let revertReason := shl(200, add(0x42414c23000000, add(add(units, shl(8, tenths)), shl(16, hundreds)))) // We can now encode the reason in memory, which can be safely overwritten as we're about to revert. The encoded // message will have the following layout: // [ revert reason identifier ] [ string location offset ] [ string length ] [ string contents ] // The Solidity revert reason identifier is 0x08c739a0, the function selector of the Error(string) function. We // also write zeroes to the next 28 bytes of memory, but those are about to be overwritten. mstore(0x0, 0x08c379a000000000000000000000000000000000000000000000000000000000) // Next is the offset to the location of the string, which will be placed immediately after (20 bytes away). mstore(0x04, 0x0000000000000000000000000000000000000000000000000000000000000020) // The string length is fixed: 7 characters. mstore(0x24, 7) // Finally, the string itself is stored. mstore(0x44, revertReason) // Even if the string is only 7 bytes long, we need to return a full 32 byte slot containing it. The length of // the encoded message is therefore 4 + 32 + 32 + 32 = 100. revert(0, 100) } } library Errors { // Math uint256 internal constant ADD_OVERFLOW = 0; uint256 internal constant SUB_OVERFLOW = 1; uint256 internal constant SUB_UNDERFLOW = 2; uint256 internal constant MUL_OVERFLOW = 3; uint256 internal constant ZERO_DIVISION = 4; uint256 internal constant DIV_INTERNAL = 5; uint256 internal constant X_OUT_OF_BOUNDS = 6; uint256 internal constant Y_OUT_OF_BOUNDS = 7; uint256 internal constant PRODUCT_OUT_OF_BOUNDS = 8; uint256 internal constant INVALID_EXPONENT = 9; // Input uint256 internal constant OUT_OF_BOUNDS = 100; uint256 internal constant UNSORTED_ARRAY = 101; uint256 internal constant UNSORTED_TOKENS = 102; uint256 internal constant INPUT_LENGTH_MISMATCH = 103; uint256 internal constant ZERO_TOKEN = 104; // Shared pools uint256 internal constant MIN_TOKENS = 200; uint256 internal constant MAX_TOKENS = 201; uint256 internal constant MAX_SWAP_FEE_PERCENTAGE = 202; uint256 internal constant MIN_SWAP_FEE_PERCENTAGE = 203; uint256 internal constant MINIMUM_BPT = 204; uint256 internal constant CALLER_NOT_VAULT = 205; uint256 internal constant UNINITIALIZED = 206; uint256 internal constant BPT_IN_MAX_AMOUNT = 207; uint256 internal constant BPT_OUT_MIN_AMOUNT = 208; uint256 internal constant EXPIRED_PERMIT = 209; uint256 internal constant NOT_TWO_TOKENS = 210; // Pools uint256 internal constant MIN_AMP = 300; uint256 internal constant MAX_AMP = 301; uint256 internal constant MIN_WEIGHT = 302; uint256 internal constant MAX_STABLE_TOKENS = 303; uint256 internal constant MAX_IN_RATIO = 304; uint256 internal constant MAX_OUT_RATIO = 305; uint256 internal constant MIN_BPT_IN_FOR_TOKEN_OUT = 306; uint256 internal constant MAX_OUT_BPT_FOR_TOKEN_IN = 307; uint256 internal constant NORMALIZED_WEIGHT_INVARIANT = 308; uint256 internal constant INVALID_TOKEN = 309; uint256 internal constant UNHANDLED_JOIN_KIND = 310; uint256 internal constant ZERO_INVARIANT = 311; uint256 internal constant ORACLE_INVALID_SECONDS_QUERY = 312; uint256 internal constant ORACLE_NOT_INITIALIZED = 313; uint256 internal constant ORACLE_QUERY_TOO_OLD = 314; uint256 internal constant ORACLE_INVALID_INDEX = 315; uint256 internal constant ORACLE_BAD_SECS = 316; uint256 internal constant AMP_END_TIME_TOO_CLOSE = 317; uint256 internal constant AMP_ONGOING_UPDATE = 318; uint256 internal constant AMP_RATE_TOO_HIGH = 319; uint256 internal constant AMP_NO_ONGOING_UPDATE = 320; uint256 internal constant STABLE_INVARIANT_DIDNT_CONVERGE = 321; uint256 internal constant STABLE_GET_BALANCE_DIDNT_CONVERGE = 322; uint256 internal constant RELAYER_NOT_CONTRACT = 323; uint256 internal constant BASE_POOL_RELAYER_NOT_CALLED = 324; uint256 internal constant REBALANCING_RELAYER_REENTERED = 325; uint256 internal constant GRADUAL_UPDATE_TIME_TRAVEL = 326; uint256 internal constant SWAPS_DISABLED = 327; uint256 internal constant CALLER_IS_NOT_LBP_OWNER = 328; uint256 internal constant PRICE_RATE_OVERFLOW = 329; uint256 internal constant INVALID_JOIN_EXIT_KIND_WHILE_SWAPS_DISABLED = 330; uint256 internal constant WEIGHT_CHANGE_TOO_FAST = 331; uint256 internal constant LOWER_GREATER_THAN_UPPER_TARGET = 332; uint256 internal constant UPPER_TARGET_TOO_HIGH = 333; uint256 internal constant UNHANDLED_BY_LINEAR_POOL = 334; uint256 internal constant OUT_OF_TARGET_RANGE = 335; // Lib uint256 internal constant REENTRANCY = 400; uint256 internal constant SENDER_NOT_ALLOWED = 401; uint256 internal constant PAUSED = 402; uint256 internal constant PAUSE_WINDOW_EXPIRED = 403; uint256 internal constant MAX_PAUSE_WINDOW_DURATION = 404; uint256 internal constant MAX_BUFFER_PERIOD_DURATION = 405; uint256 internal constant INSUFFICIENT_BALANCE = 406; uint256 internal constant INSUFFICIENT_ALLOWANCE = 407; uint256 internal constant ERC20_TRANSFER_FROM_ZERO_ADDRESS = 408; uint256 internal constant ERC20_TRANSFER_TO_ZERO_ADDRESS = 409; uint256 internal constant ERC20_MINT_TO_ZERO_ADDRESS = 410; uint256 internal constant ERC20_BURN_FROM_ZERO_ADDRESS = 411; uint256 internal constant ERC20_APPROVE_FROM_ZERO_ADDRESS = 412; uint256 internal constant ERC20_APPROVE_TO_ZERO_ADDRESS = 413; uint256 internal constant ERC20_TRANSFER_EXCEEDS_ALLOWANCE = 414; uint256 internal constant ERC20_DECREASED_ALLOWANCE_BELOW_ZERO = 415; uint256 internal constant ERC20_TRANSFER_EXCEEDS_BALANCE = 416; uint256 internal constant ERC20_BURN_EXCEEDS_ALLOWANCE = 417; uint256 internal constant SAFE_ERC20_CALL_FAILED = 418; uint256 internal constant ADDRESS_INSUFFICIENT_BALANCE = 419; uint256 internal constant ADDRESS_CANNOT_SEND_VALUE = 420; uint256 internal constant SAFE_CAST_VALUE_CANT_FIT_INT256 = 421; uint256 internal constant GRANT_SENDER_NOT_ADMIN = 422; uint256 internal constant REVOKE_SENDER_NOT_ADMIN = 423; uint256 internal constant RENOUNCE_SENDER_NOT_ALLOWED = 424; uint256 internal constant BUFFER_PERIOD_EXPIRED = 425; uint256 internal constant CALLER_IS_NOT_OWNER = 426; uint256 internal constant NEW_OWNER_IS_ZERO = 427; uint256 internal constant CODE_DEPLOYMENT_FAILED = 428; uint256 internal constant CALL_TO_NON_CONTRACT = 429; uint256 internal constant LOW_LEVEL_CALL_FAILED = 430; // Vault uint256 internal constant INVALID_POOL_ID = 500; uint256 internal constant CALLER_NOT_POOL = 501; uint256 internal constant SENDER_NOT_ASSET_MANAGER = 502; uint256 internal constant USER_DOESNT_ALLOW_RELAYER = 503; uint256 internal constant INVALID_SIGNATURE = 504; uint256 internal constant EXIT_BELOW_MIN = 505; uint256 internal constant JOIN_ABOVE_MAX = 506; uint256 internal constant SWAP_LIMIT = 507; uint256 internal constant SWAP_DEADLINE = 508; uint256 internal constant CANNOT_SWAP_SAME_TOKEN = 509; uint256 internal constant UNKNOWN_AMOUNT_IN_FIRST_SWAP = 510; uint256 internal constant MALCONSTRUCTED_MULTIHOP_SWAP = 511; uint256 internal constant INTERNAL_BALANCE_OVERFLOW = 512; uint256 internal constant INSUFFICIENT_INTERNAL_BALANCE = 513; uint256 internal constant INVALID_ETH_INTERNAL_BALANCE = 514; uint256 internal constant INVALID_POST_LOAN_BALANCE = 515; uint256 internal constant INSUFFICIENT_ETH = 516; uint256 internal constant UNALLOCATED_ETH = 517; uint256 internal constant ETH_TRANSFER = 518; uint256 internal constant CANNOT_USE_ETH_SENTINEL = 519; uint256 internal constant TOKENS_MISMATCH = 520; uint256 internal constant TOKEN_NOT_REGISTERED = 521; uint256 internal constant TOKEN_ALREADY_REGISTERED = 522; uint256 internal constant TOKENS_ALREADY_SET = 523; uint256 internal constant TOKENS_LENGTH_MUST_BE_2 = 524; uint256 internal constant NONZERO_TOKEN_BALANCE = 525; uint256 internal constant BALANCE_TOTAL_OVERFLOW = 526; uint256 internal constant POOL_NO_TOKENS = 527; uint256 internal constant INSUFFICIENT_FLASH_LOAN_BALANCE = 528; // Fees uint256 internal constant SWAP_FEE_PERCENTAGE_TOO_HIGH = 600; uint256 internal constant FLASH_LOAN_FEE_PERCENTAGE_TOO_HIGH = 601; uint256 internal constant INSUFFICIENT_FLASH_LOAN_FEE_AMOUNT = 602; } /** * @dev Library for managing * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive * types. * * Sets have the following properties: * * - Elements are added, removed, and checked for existence in constant time * (O(1)). * - Elements are enumerated in O(n). No guarantees are made on the ordering. * * ``` * contract Example { * // Add the library methods * using EnumerableSet for EnumerableSet.AddressSet; * * // Declare a set state variable * EnumerableSet.AddressSet private mySet; * } * ``` * * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`) * and `uint256` (`UintSet`) are supported. */ library EnumerableSet { // The original OpenZeppelin implementation uses a generic Set type with bytes32 values: this was replaced with // AddressSet, which uses address keys natively, resulting in more dense bytecode. struct AddressSet { // Storage of set values address[] _values; // Position of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping(address => uint256) _indexes; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(AddressSet storage set, address value) internal returns (bool) { if (!contains(set, value)) { set._values.push(value); // The value is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value set._indexes[value] = set._values.length; return true; } else { return false; } } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(AddressSet storage set, address value) internal returns (bool) { // We read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 0) { // Equivalent to contains(set, value) // To delete an element from the _values array in O(1), we swap the element to delete with the last one in // the array, and then remove the last element (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; // The swap is only necessary if we're not removing the last element if (toDeleteIndex != lastIndex) { address lastValue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastValue; // Update the index for the moved value set._indexes[lastValue] = toDeleteIndex + 1; // All indexes are 1-based } // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[value]; return true; } else { return false; } } /** * @dev Returns true if the value is in the set. O(1). */ function contains(AddressSet storage set, address value) internal view returns (bool) { return set._indexes[value] != 0; } /** * @dev Returns the number of values on the set. O(1). */ function length(AddressSet storage set) internal view returns (uint256) { return set._values.length; } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(AddressSet storage set, uint256 index) internal view returns (address) { _require(set._values.length > index, Errors.OUT_OF_BOUNDS); return unchecked_at(set, index); } /** * @dev Same as {at}, except this doesn't revert if `index` it outside of the set (i.e. if it is equal or larger * than {length}). O(1). * * This function performs one less storage read than {at}, but should only be used when `index` is known to be * within bounds. */ function unchecked_at(AddressSet storage set, uint256 index) internal view returns (address) { return set._values[index]; } function rawIndexOf(AddressSet storage set, address value) internal view returns (uint256) { return set._indexes[value] - 1; } } /** * @dev Contract module that allows children to implement role-based access * control mechanisms. * * Roles are referred to by their `bytes32` identifier. These should be exposed * in the external API and be unique. The best way to achieve this is by * using `public constant` hash digests: * * ``` * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); * ``` * * Roles can be used to represent a set of permissions. To restrict access to a * function call, use {hasRole}: * * ``` * function foo() public { * require(hasRole(MY_ROLE, msg.sender)); * ... * } * ``` * * Roles can be granted and revoked dynamically via the {grantRole} and * {revokeRole} functions. Each role has an associated admin role, and only * accounts that have a role's admin role can call {grantRole} and {revokeRole}. * * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means * that only accounts with this role will be able to grant or revoke other * roles. More complex role relationships can be created by using * {_setRoleAdmin}. * * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to * grant and revoke this role. Extra precautions should be taken to secure * accounts that have been granted it. */ abstract contract AccessControl { using EnumerableSet for EnumerableSet.AddressSet; struct RoleData { EnumerableSet.AddressSet members; bytes32 adminRole; } mapping(bytes32 => RoleData) private _roles; bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; /** * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` * * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite * {RoleAdminChanged} not being emitted signaling this. * * _Available since v3.1._ */ event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); /** * @dev Emitted when `account` is granted `role`. * * `sender` is the account that originated the contract call, an admin role * bearer except when using {_setupRole}. */ event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Emitted when `account` is revoked `role`. * * `sender` is the account that originated the contract call: * - if using `revokeRole`, it is the admin role bearer * - if using `renounceRole`, it is the role bearer (i.e. `account`) */ event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Returns `true` if `account` has been granted `role`. */ function hasRole(bytes32 role, address account) public view virtual returns (bool) { return _roles[role].members.contains(account); } /** * @dev Returns the number of accounts that have `role`. Can be used * together with {getRoleMember} to enumerate all bearers of a role. */ function getRoleMemberCount(bytes32 role) public view returns (uint256) { return _roles[role].members.length(); } /** * @dev Returns one of the accounts that have `role`. `index` must be a * value between 0 and {getRoleMemberCount}, non-inclusive. * * Role bearers are not sorted in any particular way, and their ordering may * change at any point. * * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure * you perform all queries on the same block. See the following * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] * for more information. */ function getRoleMember(bytes32 role, uint256 index) public view returns (address) { return _roles[role].members.at(index); } /** * @dev Returns the admin role that controls `role`. See {grantRole} and * {revokeRole}. * * To change a role's admin, use {_setRoleAdmin}. */ function getRoleAdmin(bytes32 role) public view returns (bytes32) { return _roles[role].adminRole; } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function grantRole(bytes32 role, address account) public virtual { _require(hasRole(_roles[role].adminRole, msg.sender), Errors.GRANT_SENDER_NOT_ADMIN); _grantRole(role, account); } /** * @dev Revokes `role` from `account`. * * If `account` had already been granted `role`, emits a {RoleRevoked} event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function revokeRole(bytes32 role, address account) public virtual { _require(hasRole(_roles[role].adminRole, msg.sender), Errors.REVOKE_SENDER_NOT_ADMIN); _revokeRole(role, account); } /** * @dev Revokes `role` from the calling account. * * Roles are often managed via {grantRole} and {revokeRole}: this function's * purpose is to provide a mechanism for accounts to lose their privileges * if they are compromised (such as when a trusted device is misplaced). * * If the calling account had been granted `role`, emits a {RoleRevoked} * event. * * Requirements: * * - the caller must be `account`. */ function renounceRole(bytes32 role, address account) public virtual { _require(account == msg.sender, Errors.RENOUNCE_SENDER_NOT_ALLOWED); _revokeRole(role, account); } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. Note that unlike {grantRole}, this function doesn't perform any * checks on the calling account. * * [WARNING] * ==== * This function should only be called from the constructor when setting * up the initial roles for the system. * * Using this function in any other way is effectively circumventing the admin * system imposed by {AccessControl}. * ==== */ function _setupRole(bytes32 role, address account) internal virtual { _grantRole(role, account); } /** * @dev Sets `adminRole` as ``role``'s admin role. * * Emits a {RoleAdminChanged} event. */ function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { emit RoleAdminChanged(role, _roles[role].adminRole, adminRole); _roles[role].adminRole = adminRole; } function _grantRole(bytes32 role, address account) private { if (_roles[role].members.add(account)) { emit RoleGranted(role, account, msg.sender); } } function _revokeRole(bytes32 role, address account) private { if (_roles[role].members.remove(account)) { emit RoleRevoked(role, account, msg.sender); } } } /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @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 `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount ) external returns (bool); /** * @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 Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; _require(c >= a, Errors.ADD_OVERFLOW); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, Errors.SUB_OVERFLOW); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, uint256 errorCode) internal pure returns (uint256) { _require(b <= a, errorCode); uint256 c = a - b; return c; } } /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is IERC20 { using SafeMath for uint256; mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is * called. * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(msg.sender, recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(msg.sender, spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve( sender, msg.sender, _allowances[sender][msg.sender].sub(amount, Errors.ERC20_TRANSFER_EXCEEDS_ALLOWANCE) ); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue)); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve( msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue, Errors.ERC20_DECREASED_ALLOWANCE_BELOW_ZERO) ); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { _require(sender != address(0), Errors.ERC20_TRANSFER_FROM_ZERO_ADDRESS); _require(recipient != address(0), Errors.ERC20_TRANSFER_TO_ZERO_ADDRESS); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, Errors.ERC20_TRANSFER_EXCEEDS_BALANCE); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { _beforeTokenTransfer(address(0), account, amount); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { _require(account != address(0), Errors.ERC20_BURN_FROM_ZERO_ADDRESS); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, Errors.ERC20_BURN_EXCEEDS_ALLOWANCE); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal { _decimals = decimals_; } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} } /** * @dev Extension of {ERC20} that allows token holders to destroy both their own * tokens and those that they have an allowance for, in a way that can be * recognized off-chain (via event analysis). */ abstract contract ERC20Burnable is ERC20 { using SafeMath for uint256; /** * @dev Destroys `amount` tokens from the caller. * * See {ERC20-_burn}. */ function burn(uint256 amount) public virtual { _burn(msg.sender, amount); } /** * @dev Destroys `amount` tokens from `account`, deducting from the caller's * allowance. * * See {ERC20-_burn} and {ERC20-allowance}. * * Requirements: * * - the caller must have allowance for ``accounts``'s tokens of at least * `amount`. */ function burnFrom(address account, uint256 amount) public virtual { uint256 decreasedAllowance = allowance(account, msg.sender).sub(amount, Errors.ERC20_BURN_EXCEEDS_ALLOWANCE); _approve(account, msg.sender, decreasedAllowance); _burn(account, amount); } } contract EEFIToken is ERC20Burnable, AccessControl { bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE"); constructor() ERC20("Elastic Finance Token", "EEFI") AccessControl() { _setupRole(DEFAULT_ADMIN_ROLE, msg.sender); } function mint(address account, uint256 amount) public { require(hasRole(MINTER_ROLE, msg.sender), "EEFIToken: must have minter role to mint"); _mint(account, amount); } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"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":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"previousAdminRole","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"newAdminRole","type":"bytes32"}],"name":"RoleAdminChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleGranted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"role","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"sender","type":"address"}],"name":"RoleRevoked","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":[],"name":"DEFAULT_ADMIN_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MINTER_ROLE","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"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":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burnFrom","outputs":[],"stateMutability":"nonpayable","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":"bytes32","name":"role","type":"bytes32"}],"name":"getRoleAdmin","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"getRoleMember","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"}],"name":"getRoleMemberCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"grantRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"hasRole","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","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":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","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"}]
Contract Creation Code
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Swarm Source
ipfs://c6dc2972e098f955202a9d96705d4859349d3db216b095c65f091d01634aee1e
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