Address Contract Partially Verified
Address
0x44d771D0C998f524ff39aB6Df64B72bce1d09566
Balance
0 ETH
Nonce
1
Code Size
8102 bytes
Creator
0xf29b6cfD...a08e at tx 0x53867670...5076d2
Indexed Transactions
0
Contract Bytecode
8102 bytes
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Verified Source Code Partial Match
Compiler: v0.6.12+commit.27d51765
EVM: istanbul
Optimization: No
YfDAIstaking.sol 471 lines
pragma solidity 0.6.12;
// SPDX-License-Identifier: BSD-3-Clause
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
/**
* @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 v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`
* (`UintSet`) are supported.
*/
library EnumerableSet {
// To implement this library for multiple types with as little code
// repetition as possible, we write it in terms of a generic Set type with
// bytes32 values.
// The Set implementation uses private functions, and user-facing
// implementations (such as AddressSet) are just wrappers around the
// underlying Set.
// This means that we can only create new EnumerableSets for types that fit
// in bytes32.
struct Set {
// Storage of set values
bytes32[] _values;
// Position of the value in the `values` array, plus 1 because index 0
// means a value is not in the set.
mapping (bytes32 => 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(Set storage set, bytes32 value) private 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(Set storage set, bytes32 value) private 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;
// When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
// so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.
bytes32 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(Set storage set, bytes32 value) private view returns (bool) {
return set._indexes[value] != 0;
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function _length(Set storage set) private 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(Set storage set, uint256 index) private view returns (bytes32) {
require(set._values.length > index, "EnumerableSet: index out of bounds");
return set._values[index];
}
// AddressSet
struct AddressSet {
Set _inner;
}
/**
* @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) {
return _add(set._inner, bytes32(uint256(value)));
}
/**
* @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) {
return _remove(set._inner, bytes32(uint256(value)));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(AddressSet storage set, address value) internal view returns (bool) {
return _contains(set._inner, bytes32(uint256(value)));
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(AddressSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @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) {
return address(uint256(_at(set._inner, index)));
}
// UintSet
struct UintSet {
Set _inner;
}
/**
* @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(UintSet storage set, uint256 value) internal returns (bool) {
return _add(set._inner, bytes32(value));
}
/**
* @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(UintSet storage set, uint256 value) internal returns (bool) {
return _remove(set._inner, bytes32(value));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(UintSet storage set, uint256 value) internal view returns (bool) {
return _contains(set._inner, bytes32(value));
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function length(UintSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @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(UintSet storage set, uint256 index) internal view returns (uint256) {
return uint256(_at(set._inner, index));
}
}
/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address public owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
constructor() public {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) onlyOwner public {
require(newOwner != address(0));
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
interface Token {
function transferFrom(address, address, uint) external returns (bool);
function transfer(address, uint) external returns (bool);
}
contract YfDAIstaking is Ownable {
using SafeMath for uint;
using EnumerableSet for EnumerableSet.AddressSet;
event RewardsTransferred(address holder, uint amount);
// yfdai token contract address
address public constant tokenAddress = 0xf4CD3d3Fda8d7Fd6C5a500203e38640A70Bf9577;
// reward rate 72.00% per year
uint public constant rewardRate = 7200;
uint public constant rewardInterval = 365 days;
// staking fee 1.50 percent
uint public constant stakingFeeRate = 150;
// unstaking fee 0.50 percent
uint public constant unstakingFeeRate = 50;
// unstaking possible after 72 hours
uint public constant cliffTime = 72 hours;
uint public totalClaimedRewards = 0;
EnumerableSet.AddressSet private holders;
mapping (address => uint) public depositedTokens;
mapping (address => uint) public stakingTime;
mapping (address => uint) public lastClaimedTime;
mapping (address => uint) public totalEarnedTokens;
function updateAccount(address account) private {
uint pendingDivs = getPendingDivs(account);
if (pendingDivs > 0) {
require(Token(tokenAddress).transfer(account, pendingDivs), "Could not transfer tokens.");
totalEarnedTokens[account] = totalEarnedTokens[account].add(pendingDivs);
totalClaimedRewards = totalClaimedRewards.add(pendingDivs);
emit RewardsTransferred(account, pendingDivs);
}
lastClaimedTime[account] = now;
}
function getPendingDivs(address _holder) public view returns (uint) {
if (!holders.contains(_holder)) return 0;
if (depositedTokens[_holder] == 0) return 0;
uint timeDiff = now.sub(lastClaimedTime[_holder]);
uint stakedAmount = depositedTokens[_holder];
uint pendingDivs = stakedAmount
.mul(rewardRate)
.mul(timeDiff)
.div(rewardInterval)
.div(1e4);
return pendingDivs;
}
function getNumberOfHolders() public view returns (uint) {
return holders.length();
}
function deposit(uint amountToStake) public {
require(amountToStake > 0, "Cannot deposit 0 Tokens");
require(Token(tokenAddress).transferFrom(msg.sender, address(this), amountToStake), "Insufficient Token Allowance");
updateAccount(msg.sender);
uint fee = amountToStake.mul(stakingFeeRate).div(1e4);
uint amountAfterFee = amountToStake.sub(fee);
require(Token(tokenAddress).transfer(owner, fee), "Could not transfer deposit fee.");
depositedTokens[msg.sender] = depositedTokens[msg.sender].add(amountAfterFee);
if (!holders.contains(msg.sender)) {
holders.add(msg.sender);
stakingTime[msg.sender] = now;
}
}
function withdraw(uint amountToWithdraw) public {
require(depositedTokens[msg.sender] >= amountToWithdraw, "Invalid amount to withdraw");
require(now.sub(stakingTime[msg.sender]) > cliffTime, "You recently staked, please wait before withdrawing.");
updateAccount(msg.sender);
uint fee = amountToWithdraw.mul(unstakingFeeRate).div(1e4);
uint amountAfterFee = amountToWithdraw.sub(fee);
require(Token(tokenAddress).transfer(owner, fee), "Could not transfer withdraw fee.");
require(Token(tokenAddress).transfer(msg.sender, amountAfterFee), "Could not transfer tokens.");
depositedTokens[msg.sender] = depositedTokens[msg.sender].sub(amountToWithdraw);
if (holders.contains(msg.sender) && depositedTokens[msg.sender] == 0) {
holders.remove(msg.sender);
}
}
function claimDivs() public {
updateAccount(msg.sender);
}
function getStakersList(uint startIndex, uint endIndex)
public
view
returns (address[] memory stakers,
uint[] memory stakingTimestamps,
uint[] memory lastClaimedTimeStamps,
uint[] memory stakedTokens) {
require (startIndex < endIndex);
uint length = endIndex.sub(startIndex);
address[] memory _stakers = new address[](length);
uint[] memory _stakingTimestamps = new uint[](length);
uint[] memory _lastClaimedTimeStamps = new uint[](length);
uint[] memory _stakedTokens = new uint[](length);
for (uint i = startIndex; i < endIndex; i = i.add(1)) {
address staker = holders.at(i);
uint listIndex = i.sub(startIndex);
_stakers[listIndex] = staker;
_stakingTimestamps[listIndex] = stakingTime[staker];
_lastClaimedTimeStamps[listIndex] = lastClaimedTime[staker];
_stakedTokens[listIndex] = depositedTokens[staker];
}
return (_stakers, _stakingTimestamps, _lastClaimedTimeStamps, _stakedTokens);
}
uint private constant stakingAndDaoTokens = 5129e18;
function getStakingAndDaoAmount() public view returns (uint) {
if (totalClaimedRewards >= stakingAndDaoTokens) {
return 0;
}
uint remaining = stakingAndDaoTokens.sub(totalClaimedRewards);
return remaining;
}
// function to allow admin to claim *other* ERC20 tokens sent to this contract (by mistake)
// Admin cannot transfer out YF-DAI from this smart contract
function transferAnyERC20Tokens(address _tokenAddr, address _to, uint _amount) public onlyOwner {
require (_tokenAddr != tokenAddress, "Cannot Transfer Out YF-DAI!");
Token(_tokenAddr).transfer(_to, _amount);
}
}
Read Contract
cliffTime 0x0f1a6444 → uint256
depositedTokens 0xc326bf4f → uint256
getNumberOfHolders 0x308feec3 → uint256
getPendingDivs 0x98896d10 → uint256
getStakersList 0x1911cf4a → address[], uint256[], uint256[], uint256[]
getStakingAndDaoAmount 0x268cab49 → uint256
lastClaimedTime 0xf3f91fa0 → uint256
owner 0x8da5cb5b → address
rewardInterval 0xbec4de3f → uint256
rewardRate 0x7b0a47ee → uint256
stakingFeeRate 0x5ef057be → uint256
stakingTime 0x583d42fd → uint256
tokenAddress 0x9d76ea58 → address
totalClaimedRewards 0xd578ceab → uint256
totalEarnedTokens 0x6270cd18 → uint256
unstakingFeeRate 0xd816c7d5 → uint256
Write Contract 5 functions
These functions modify contract state and require a wallet transaction to execute.
claimDivs 0x19aa70e7
No parameters
deposit 0xb6b55f25
uint256 amountToStake
transferAnyERC20Tokens 0x6a395ccb
address _tokenAddr
address _to
uint256 _amount
transferOwnership 0xf2fde38b
address newOwner
withdraw 0x2e1a7d4d
uint256 amountToWithdraw
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