ERC-20
Overview
Max Total Supply
18,295,453,367,960.803364405242451432 opXEN
Holders
4,334
Market
Price
$0.00 @ 0.000000 ETH
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
251,134,387.056685888298029444 opXENValue
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This contract contains unverified libraries: XENMath
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Contract Name:
XENCrypto
Compiler Version
v0.8.17+commit.8df45f5f
Optimization Enabled:
Yes with 20 runs
Other Settings:
london EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.10; import "./XENMath.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/interfaces/IERC165.sol"; import "abdk-libraries-solidity/ABDKMath64x64.sol"; import "./interfaces/IStakingToken.sol"; import "./interfaces/IRankedMintingToken.sol"; import "./interfaces/IBurnableToken.sol"; import "./interfaces/IBurnRedeemable.sol"; contract XENCrypto is Context, IRankedMintingToken, IStakingToken, IBurnableToken, ERC20("XEN Crypto", "opXEN") { using XENMath for uint256; using ABDKMath64x64 for int128; using ABDKMath64x64 for uint256; // INTERNAL TYPE TO DESCRIBE A XEN MINT INFO struct MintInfo { address user; uint256 term; uint256 maturityTs; uint256 rank; uint256 amplifier; uint256 eaaRate; } // INTERNAL TYPE TO DESCRIBE A XEN STAKE struct StakeInfo { uint256 term; uint256 maturityTs; uint256 amount; uint256 apy; } // PUBLIC CONSTANTS uint256 public constant SECONDS_IN_DAY = 3_600 * 24; uint256 public constant DAYS_IN_YEAR = 365; uint256 public constant GENESIS_RANK = 1; uint256 public constant MIN_TERM = 1 * SECONDS_IN_DAY - 1; uint256 public constant MAX_TERM_START = 100 * SECONDS_IN_DAY; uint256 public constant MAX_TERM_END = 1_000 * SECONDS_IN_DAY; uint256 public constant TERM_AMPLIFIER = 15; uint256 public constant TERM_AMPLIFIER_THRESHOLD = 5_000; uint256 public constant REWARD_AMPLIFIER_START = 300; /* OP-300 */ uint256 public constant REWARD_AMPLIFIER_END = 1; uint256 public constant EAA_PM_START = 100; uint256 public constant EAA_PM_STEP = 1; uint256 public constant EAA_RANK_STEP = 100_000; uint256 public constant WITHDRAWAL_WINDOW_DAYS = 7; uint256 public constant MAX_PENALTY_PCT = 99; uint256 public constant XEN_MIN_STAKE = 0; uint256 public constant XEN_MIN_BURN = 0; uint256 public constant XEN_APY_START = 20; uint256 public constant XEN_APY_DAYS_STEP = 90; uint256 public constant XEN_APY_END = 2; string public constant AUTHORS = "@MrJackLevin @lbelyaev faircrypto.org"; // PUBLIC STATE, READABLE VIA NAMESAKE GETTERS uint256 public immutable genesisTs; uint256 public globalRank = GENESIS_RANK; uint256 public activeMinters; uint256 public activeStakes; uint256 public totalXenStaked; // user address => XEN mint info mapping(address => MintInfo) public userMints; // user address => XEN stake info mapping(address => StakeInfo) public userStakes; // user address => XEN burn amount mapping(address => uint256) public userBurns; // CONSTRUCTOR constructor() { genesisTs = block.timestamp; } // PRIVATE METHODS /** * @dev calculates current MaxTerm based on Global Rank * (if Global Rank crosses over TERM_AMPLIFIER_THRESHOLD) */ function _calculateMaxTerm() private view returns (uint256) { if (globalRank > TERM_AMPLIFIER_THRESHOLD) { uint256 delta = globalRank.fromUInt().log_2().mul(TERM_AMPLIFIER.fromUInt()).toUInt(); uint256 newMax = MAX_TERM_START + delta * SECONDS_IN_DAY; return XENMath.min(newMax, MAX_TERM_END); } return MAX_TERM_START; } /** * @dev calculates Withdrawal Penalty depending on lateness */ function _penalty(uint256 secsLate) private pure returns (uint256) { // =MIN(2^(daysLate+3)/window-1,99) uint256 daysLate = secsLate / SECONDS_IN_DAY; if (daysLate > WITHDRAWAL_WINDOW_DAYS - 1) return MAX_PENALTY_PCT; uint256 penalty = (uint256(1) << (daysLate + 3)) / WITHDRAWAL_WINDOW_DAYS - 1; return XENMath.min(penalty, MAX_PENALTY_PCT); } /** * @dev calculates net Mint Reward (adjusted for Penalty) */ function _calculateMintReward( uint256 cRank, uint256 term, uint256 maturityTs, uint256 amplifier, uint256 eeaRate ) private view returns (uint256) { uint256 secsLate = block.timestamp - maturityTs; uint256 penalty = _penalty(secsLate); uint256 rankDelta = XENMath.max(globalRank - cRank, 2); uint256 EAA = (1_000 + eeaRate); uint256 reward = getGrossReward(rankDelta, amplifier, term, EAA); return (reward * (100 - penalty)) / 100; } /** * @dev cleans up User Mint storage (gets some Gas credit;)) */ function _cleanUpUserMint() private { delete userMints[_msgSender()]; activeMinters--; } /** * @dev calculates XEN Stake Reward */ function _calculateStakeReward( uint256 amount, uint256 term, uint256 maturityTs, uint256 apy ) private view returns (uint256) { if (block.timestamp > maturityTs) { uint256 rate = (apy * term * 1_000_000) / DAYS_IN_YEAR; return (amount * rate) / 100_000_000; } return 0; } /** * @dev calculates Reward Amplifier */ function _calculateRewardAmplifier() private view returns (uint256) { uint256 amplifierDecrease = (block.timestamp - genesisTs) / SECONDS_IN_DAY; if (amplifierDecrease < REWARD_AMPLIFIER_START) { return XENMath.max(REWARD_AMPLIFIER_START - amplifierDecrease, REWARD_AMPLIFIER_END); } else { return REWARD_AMPLIFIER_END; } } /** * @dev calculates Early Adopter Amplifier Rate (in 1/000ths) * actual EAA is (1_000 + EAAR) / 1_000 */ function _calculateEAARate() private view returns (uint256) { uint256 decrease = (EAA_PM_STEP * globalRank) / EAA_RANK_STEP; if (decrease > EAA_PM_START) return 0; return EAA_PM_START - decrease; } /** * @dev calculates APY (in %) */ function _calculateAPY() private view returns (uint256) { uint256 decrease = (block.timestamp - genesisTs) / (SECONDS_IN_DAY * XEN_APY_DAYS_STEP); if (XEN_APY_START - XEN_APY_END < decrease) return XEN_APY_END; return XEN_APY_START - decrease; } /** * @dev creates User Stake */ function _createStake(uint256 amount, uint256 term) private { userStakes[_msgSender()] = StakeInfo({ term: term, maturityTs: block.timestamp + term * SECONDS_IN_DAY, amount: amount, apy: _calculateAPY() }); activeStakes++; totalXenStaked += amount; } // PUBLIC CONVENIENCE GETTERS /** * @dev calculates gross Mint Reward */ function getGrossReward( uint256 rankDelta, uint256 amplifier, uint256 term, uint256 eaa ) public pure returns (uint256) { int128 log128 = rankDelta.fromUInt().log_2(); int128 reward128 = log128.mul(amplifier.fromUInt()).mul(term.fromUInt()).mul(eaa.fromUInt()); return reward128.div(uint256(1_000).fromUInt()).toUInt(); } /** * @dev returns User Mint object associated with User account address */ function getUserMint() external view returns (MintInfo memory) { return userMints[_msgSender()]; } /** * @dev returns XEN Stake object associated with User account address */ function getUserStake() external view returns (StakeInfo memory) { return userStakes[_msgSender()]; } /** * @dev returns current AMP */ function getCurrentAMP() external view returns (uint256) { return _calculateRewardAmplifier(); } /** * @dev returns current EAA Rate */ function getCurrentEAAR() external view returns (uint256) { return _calculateEAARate(); } /** * @dev returns current APY */ function getCurrentAPY() external view returns (uint256) { return _calculateAPY(); } /** * @dev returns current MaxTerm */ function getCurrentMaxTerm() external view returns (uint256) { return _calculateMaxTerm(); } // PUBLIC STATE-CHANGING METHODS /** * @dev accepts User cRank claim provided all checks pass (incl. no current claim exists) */ function claimRank(uint256 term) external { uint256 termSec = term * SECONDS_IN_DAY; require(termSec > MIN_TERM, "CRank: Term less than min"); require(termSec < _calculateMaxTerm() + 1, "CRank: Term more than current max term"); require(userMints[_msgSender()].rank == 0, "CRank: Mint already in progress"); // create and store new MintInfo MintInfo memory mintInfo = MintInfo({ user: _msgSender(), term: term, maturityTs: block.timestamp + termSec, rank: globalRank, amplifier: _calculateRewardAmplifier(), eaaRate: _calculateEAARate() }); userMints[_msgSender()] = mintInfo; activeMinters++; emit RankClaimed(_msgSender(), term, globalRank++); } /** * @dev ends minting upon maturity (and within permitted Withdrawal Time Window), gets minted XEN */ function claimMintReward() external { MintInfo memory mintInfo = userMints[_msgSender()]; require(mintInfo.rank > 0, "CRank: No mint exists"); require(block.timestamp > mintInfo.maturityTs, "CRank: Mint maturity not reached"); // calculate reward and mint tokens uint256 rewardAmount = _calculateMintReward( mintInfo.rank, mintInfo.term, mintInfo.maturityTs, mintInfo.amplifier, mintInfo.eaaRate ) * 1 ether; _mint(_msgSender(), rewardAmount); _cleanUpUserMint(); emit MintClaimed(_msgSender(), rewardAmount); } /** * @dev ends minting upon maturity (and within permitted Withdrawal time Window) * mints XEN coins and splits them between User and designated other address */ function claimMintRewardAndShare(address other, uint256 pct) external { MintInfo memory mintInfo = userMints[_msgSender()]; require(other != address(0), "CRank: Cannot share with zero address"); require(pct > 0, "CRank: Cannot share zero percent"); require(pct < 101, "CRank: Cannot share 100+ percent"); require(mintInfo.rank > 0, "CRank: No mint exists"); require(block.timestamp > mintInfo.maturityTs, "CRank: Mint maturity not reached"); // calculate reward uint256 rewardAmount = _calculateMintReward( mintInfo.rank, mintInfo.term, mintInfo.maturityTs, mintInfo.amplifier, mintInfo.eaaRate ) * 1 ether; uint256 sharedReward = (rewardAmount * pct) / 100; uint256 ownReward = rewardAmount - sharedReward; // mint reward tokens _mint(_msgSender(), ownReward); _mint(other, sharedReward); _cleanUpUserMint(); emit MintClaimed(_msgSender(), rewardAmount); } /** * @dev ends minting upon maturity (and within permitted Withdrawal time Window) * mints XEN coins and stakes 'pct' of it for 'term' */ function claimMintRewardAndStake(uint256 pct, uint256 term) external { MintInfo memory mintInfo = userMints[_msgSender()]; // require(pct > 0, "CRank: Cannot share zero percent"); require(pct < 101, "CRank: Cannot share >100 percent"); require(mintInfo.rank > 0, "CRank: No mint exists"); require(block.timestamp > mintInfo.maturityTs, "CRank: Mint maturity not reached"); // calculate reward uint256 rewardAmount = _calculateMintReward( mintInfo.rank, mintInfo.term, mintInfo.maturityTs, mintInfo.amplifier, mintInfo.eaaRate ) * 1 ether; uint256 stakedReward = (rewardAmount * pct) / 100; uint256 ownReward = rewardAmount - stakedReward; // mint reward tokens part _mint(_msgSender(), ownReward); _cleanUpUserMint(); emit MintClaimed(_msgSender(), rewardAmount); // nothing to burn since we haven't minted this part yet // stake extra tokens part require(stakedReward > XEN_MIN_STAKE, "XEN: Below min stake"); require(term * SECONDS_IN_DAY > MIN_TERM, "XEN: Below min stake term"); require(term * SECONDS_IN_DAY < MAX_TERM_END + 1, "XEN: Above max stake term"); require(userStakes[_msgSender()].amount == 0, "XEN: stake exists"); _createStake(stakedReward, term); emit Staked(_msgSender(), stakedReward, term); } /** * @dev initiates XEN Stake in amount for a term (days) */ function stake(uint256 amount, uint256 term) external { require(balanceOf(_msgSender()) >= amount, "XEN: not enough balance"); require(amount > XEN_MIN_STAKE, "XEN: Below min stake"); require(term * SECONDS_IN_DAY > MIN_TERM, "XEN: Below min stake term"); require(term * SECONDS_IN_DAY < MAX_TERM_END + 1, "XEN: Above max stake term"); require(userStakes[_msgSender()].amount == 0, "XEN: stake exists"); // burn staked XEN _burn(_msgSender(), amount); // create XEN Stake _createStake(amount, term); emit Staked(_msgSender(), amount, term); } /** * @dev ends XEN Stake and gets reward if the Stake is mature */ function withdraw() external { StakeInfo memory userStake = userStakes[_msgSender()]; require(userStake.amount > 0, "XEN: no stake exists"); uint256 xenReward = _calculateStakeReward( userStake.amount, userStake.term, userStake.maturityTs, userStake.apy ); activeStakes--; totalXenStaked -= userStake.amount; // mint staked XEN (+ reward) _mint(_msgSender(), userStake.amount + xenReward); emit Withdrawn(_msgSender(), userStake.amount, xenReward); delete userStakes[_msgSender()]; } /** * @dev burns XEN tokens and creates Proof-Of-Burn record to be used by connected DeFi services */ function burn(address user, uint256 amount) public { require(amount > XEN_MIN_BURN, "Burn: Below min limit"); require( IERC165(_msgSender()).supportsInterface(type(IBurnRedeemable).interfaceId), "Burn: not a supported contract" ); _spendAllowance(user, _msgSender(), amount); _burn(user, amount); userBurns[user] += amount; IBurnRedeemable(_msgSender()).onTokenBurned(user, amount); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.10; interface IStakingToken { event Staked(address indexed user, uint256 amount, uint256 term); event Withdrawn(address indexed user, uint256 amount, uint256 reward); function stake(uint256 amount, uint256 term) external; function withdraw() external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.10; interface IRankedMintingToken { event RankClaimed(address indexed user, uint256 term, uint256 rank); event MintClaimed(address indexed user, uint256 rewardAmount); function claimRank(uint256 term) external; function claimMintReward() external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.10; interface IBurnableToken { function burn(address user, uint256 amount) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.10; interface IBurnRedeemable { event Redeemed( address indexed user, address indexed xenContract, address indexed tokenContract, uint256 xenAmount, uint256 tokenAmount ); function onTokenBurned(address user, uint256 amount) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.10; import "abdk-libraries-solidity/ABDKMath64x64.sol"; library XENMath { function min(uint256 a, uint256 b) external pure returns (uint256) { if (a > b) return b; return a; } function max(uint256 a, uint256 b) external pure returns (uint256) { if (a > b) return a; return b; } function logX64(uint256 x) external pure returns (int128) { return ABDKMath64x64.log_2(ABDKMath64x64.fromUInt(x)); } }
// SPDX-License-Identifier: BSD-4-Clause /* * ABDK Math 64.64 Smart Contract Library. Copyright © 2019 by ABDK Consulting. * Author: Mikhail Vladimirov <[email protected]> */ pragma solidity ^0.8.0; /** * Smart contract library of mathematical functions operating with signed * 64.64-bit fixed point numbers. Signed 64.64-bit fixed point number is * basically a simple fraction whose numerator is signed 128-bit integer and * denominator is 2^64. As long as denominator is always the same, there is no * need to store it, thus in Solidity signed 64.64-bit fixed point numbers are * represented by int128 type holding only the numerator. */ library ABDKMath64x64 { /* * Minimum value signed 64.64-bit fixed point number may have. */ int128 private constant MIN_64x64 = -0x80000000000000000000000000000000; /* * Maximum value signed 64.64-bit fixed point number may have. */ int128 private constant MAX_64x64 = 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF; /** * Convert signed 256-bit integer number into signed 64.64-bit fixed point * number. Revert on overflow. * * @param x signed 256-bit integer number * @return signed 64.64-bit fixed point number */ function fromInt (int256 x) internal pure returns (int128) { unchecked { require (x >= -0x8000000000000000 && x <= 0x7FFFFFFFFFFFFFFF); return int128 (x << 64); } } /** * Convert signed 64.64 fixed point number into signed 64-bit integer number * rounding down. * * @param x signed 64.64-bit fixed point number * @return signed 64-bit integer number */ function toInt (int128 x) internal pure returns (int64) { unchecked { return int64 (x >> 64); } } /** * Convert unsigned 256-bit integer number into signed 64.64-bit fixed point * number. Revert on overflow. * * @param x unsigned 256-bit integer number * @return signed 64.64-bit fixed point number */ function fromUInt (uint256 x) internal pure returns (int128) { unchecked { require (x <= 0x7FFFFFFFFFFFFFFF); return int128 (int256 (x << 64)); } } /** * Convert signed 64.64 fixed point number into unsigned 64-bit integer * number rounding down. Revert on underflow. * * @param x signed 64.64-bit fixed point number * @return unsigned 64-bit integer number */ function toUInt (int128 x) internal pure returns (uint64) { unchecked { require (x >= 0); return uint64 (uint128 (x >> 64)); } } /** * Convert signed 128.128 fixed point number into signed 64.64-bit fixed point * number rounding down. Revert on overflow. * * @param x signed 128.128-bin fixed point number * @return signed 64.64-bit fixed point number */ function from128x128 (int256 x) internal pure returns (int128) { unchecked { int256 result = x >> 64; require (result >= MIN_64x64 && result <= MAX_64x64); return int128 (result); } } /** * Convert signed 64.64 fixed point number into signed 128.128 fixed point * number. * * @param x signed 64.64-bit fixed point number * @return signed 128.128 fixed point number */ function to128x128 (int128 x) internal pure returns (int256) { unchecked { return int256 (x) << 64; } } /** * Calculate x + y. Revert on overflow. * * @param x signed 64.64-bit fixed point number * @param y signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function add (int128 x, int128 y) internal pure returns (int128) { unchecked { int256 result = int256(x) + y; require (result >= MIN_64x64 && result <= MAX_64x64); return int128 (result); } } /** * Calculate x - y. Revert on overflow. * * @param x signed 64.64-bit fixed point number * @param y signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function sub (int128 x, int128 y) internal pure returns (int128) { unchecked { int256 result = int256(x) - y; require (result >= MIN_64x64 && result <= MAX_64x64); return int128 (result); } } /** * Calculate x * y rounding down. Revert on overflow. * * @param x signed 64.64-bit fixed point number * @param y signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function mul (int128 x, int128 y) internal pure returns (int128) { unchecked { int256 result = int256(x) * y >> 64; require (result >= MIN_64x64 && result <= MAX_64x64); return int128 (result); } } /** * Calculate x * y rounding towards zero, where x is signed 64.64 fixed point * number and y is signed 256-bit integer number. Revert on overflow. * * @param x signed 64.64 fixed point number * @param y signed 256-bit integer number * @return signed 256-bit integer number */ function muli (int128 x, int256 y) internal pure returns (int256) { unchecked { if (x == MIN_64x64) { require (y >= -0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF && y <= 0x1000000000000000000000000000000000000000000000000); return -y << 63; } else { bool negativeResult = false; if (x < 0) { x = -x; negativeResult = true; } if (y < 0) { y = -y; // We rely on overflow behavior here negativeResult = !negativeResult; } uint256 absoluteResult = mulu (x, uint256 (y)); if (negativeResult) { require (absoluteResult <= 0x8000000000000000000000000000000000000000000000000000000000000000); return -int256 (absoluteResult); // We rely on overflow behavior here } else { require (absoluteResult <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF); return int256 (absoluteResult); } } } } /** * Calculate x * y rounding down, where x is signed 64.64 fixed point number * and y is unsigned 256-bit integer number. Revert on overflow. * * @param x signed 64.64 fixed point number * @param y unsigned 256-bit integer number * @return unsigned 256-bit integer number */ function mulu (int128 x, uint256 y) internal pure returns (uint256) { unchecked { if (y == 0) return 0; require (x >= 0); uint256 lo = (uint256 (int256 (x)) * (y & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)) >> 64; uint256 hi = uint256 (int256 (x)) * (y >> 128); require (hi <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF); hi <<= 64; require (hi <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF - lo); return hi + lo; } } /** * Calculate x / y rounding towards zero. Revert on overflow or when y is * zero. * * @param x signed 64.64-bit fixed point number * @param y signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function div (int128 x, int128 y) internal pure returns (int128) { unchecked { require (y != 0); int256 result = (int256 (x) << 64) / y; require (result >= MIN_64x64 && result <= MAX_64x64); return int128 (result); } } /** * Calculate x / y rounding towards zero, where x and y are signed 256-bit * integer numbers. Revert on overflow or when y is zero. * * @param x signed 256-bit integer number * @param y signed 256-bit integer number * @return signed 64.64-bit fixed point number */ function divi (int256 x, int256 y) internal pure returns (int128) { unchecked { require (y != 0); bool negativeResult = false; if (x < 0) { x = -x; // We rely on overflow behavior here negativeResult = true; } if (y < 0) { y = -y; // We rely on overflow behavior here negativeResult = !negativeResult; } uint128 absoluteResult = divuu (uint256 (x), uint256 (y)); if (negativeResult) { require (absoluteResult <= 0x80000000000000000000000000000000); return -int128 (absoluteResult); // We rely on overflow behavior here } else { require (absoluteResult <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF); return int128 (absoluteResult); // We rely on overflow behavior here } } } /** * Calculate x / y rounding towards zero, where x and y are unsigned 256-bit * integer numbers. Revert on overflow or when y is zero. * * @param x unsigned 256-bit integer number * @param y unsigned 256-bit integer number * @return signed 64.64-bit fixed point number */ function divu (uint256 x, uint256 y) internal pure returns (int128) { unchecked { require (y != 0); uint128 result = divuu (x, y); require (result <= uint128 (MAX_64x64)); return int128 (result); } } /** * Calculate -x. Revert on overflow. * * @param x signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function neg (int128 x) internal pure returns (int128) { unchecked { require (x != MIN_64x64); return -x; } } /** * Calculate |x|. Revert on overflow. * * @param x signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function abs (int128 x) internal pure returns (int128) { unchecked { require (x != MIN_64x64); return x < 0 ? -x : x; } } /** * Calculate 1 / x rounding towards zero. Revert on overflow or when x is * zero. * * @param x signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function inv (int128 x) internal pure returns (int128) { unchecked { require (x != 0); int256 result = int256 (0x100000000000000000000000000000000) / x; require (result >= MIN_64x64 && result <= MAX_64x64); return int128 (result); } } /** * Calculate arithmetics average of x and y, i.e. (x + y) / 2 rounding down. * * @param x signed 64.64-bit fixed point number * @param y signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function avg (int128 x, int128 y) internal pure returns (int128) { unchecked { return int128 ((int256 (x) + int256 (y)) >> 1); } } /** * Calculate geometric average of x and y, i.e. sqrt (x * y) rounding down. * Revert on overflow or in case x * y is negative. * * @param x signed 64.64-bit fixed point number * @param y signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function gavg (int128 x, int128 y) internal pure returns (int128) { unchecked { int256 m = int256 (x) * int256 (y); require (m >= 0); require (m < 0x4000000000000000000000000000000000000000000000000000000000000000); return int128 (sqrtu (uint256 (m))); } } /** * Calculate x^y assuming 0^0 is 1, where x is signed 64.64 fixed point number * and y is unsigned 256-bit integer number. Revert on overflow. * * @param x signed 64.64-bit fixed point number * @param y uint256 value * @return signed 64.64-bit fixed point number */ function pow (int128 x, uint256 y) internal pure returns (int128) { unchecked { bool negative = x < 0 && y & 1 == 1; uint256 absX = uint128 (x < 0 ? -x : x); uint256 absResult; absResult = 0x100000000000000000000000000000000; if (absX <= 0x10000000000000000) { absX <<= 63; while (y != 0) { if (y & 0x1 != 0) { absResult = absResult * absX >> 127; } absX = absX * absX >> 127; if (y & 0x2 != 0) { absResult = absResult * absX >> 127; } absX = absX * absX >> 127; if (y & 0x4 != 0) { absResult = absResult * absX >> 127; } absX = absX * absX >> 127; if (y & 0x8 != 0) { absResult = absResult * absX >> 127; } absX = absX * absX >> 127; y >>= 4; } absResult >>= 64; } else { uint256 absXShift = 63; if (absX < 0x1000000000000000000000000) { absX <<= 32; absXShift -= 32; } if (absX < 0x10000000000000000000000000000) { absX <<= 16; absXShift -= 16; } if (absX < 0x1000000000000000000000000000000) { absX <<= 8; absXShift -= 8; } if (absX < 0x10000000000000000000000000000000) { absX <<= 4; absXShift -= 4; } if (absX < 0x40000000000000000000000000000000) { absX <<= 2; absXShift -= 2; } if (absX < 0x80000000000000000000000000000000) { absX <<= 1; absXShift -= 1; } uint256 resultShift = 0; while (y != 0) { require (absXShift < 64); if (y & 0x1 != 0) { absResult = absResult * absX >> 127; resultShift += absXShift; if (absResult > 0x100000000000000000000000000000000) { absResult >>= 1; resultShift += 1; } } absX = absX * absX >> 127; absXShift <<= 1; if (absX >= 0x100000000000000000000000000000000) { absX >>= 1; absXShift += 1; } y >>= 1; } require (resultShift < 64); absResult >>= 64 - resultShift; } int256 result = negative ? -int256 (absResult) : int256 (absResult); require (result >= MIN_64x64 && result <= MAX_64x64); return int128 (result); } } /** * Calculate sqrt (x) rounding down. Revert if x < 0. * * @param x signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function sqrt (int128 x) internal pure returns (int128) { unchecked { require (x >= 0); return int128 (sqrtu (uint256 (int256 (x)) << 64)); } } /** * Calculate binary logarithm of x. Revert if x <= 0. * * @param x signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function log_2 (int128 x) internal pure returns (int128) { unchecked { require (x > 0); int256 msb = 0; int256 xc = x; if (xc >= 0x10000000000000000) { xc >>= 64; msb += 64; } if (xc >= 0x100000000) { xc >>= 32; msb += 32; } if (xc >= 0x10000) { xc >>= 16; msb += 16; } if (xc >= 0x100) { xc >>= 8; msb += 8; } if (xc >= 0x10) { xc >>= 4; msb += 4; } if (xc >= 0x4) { xc >>= 2; msb += 2; } if (xc >= 0x2) msb += 1; // No need to shift xc anymore int256 result = msb - 64 << 64; uint256 ux = uint256 (int256 (x)) << uint256 (127 - msb); for (int256 bit = 0x8000000000000000; bit > 0; bit >>= 1) { ux *= ux; uint256 b = ux >> 255; ux >>= 127 + b; result += bit * int256 (b); } return int128 (result); } } /** * Calculate natural logarithm of x. Revert if x <= 0. * * @param x signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function ln (int128 x) internal pure returns (int128) { unchecked { require (x > 0); return int128 (int256 ( uint256 (int256 (log_2 (x))) * 0xB17217F7D1CF79ABC9E3B39803F2F6AF >> 128)); } } /** * Calculate binary exponent of x. Revert on overflow. * * @param x signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function exp_2 (int128 x) internal pure returns (int128) { unchecked { require (x < 0x400000000000000000); // Overflow if (x < -0x400000000000000000) return 0; // Underflow uint256 result = 0x80000000000000000000000000000000; if (x & 0x8000000000000000 > 0) result = result * 0x16A09E667F3BCC908B2FB1366EA957D3E >> 128; if (x & 0x4000000000000000 > 0) result = result * 0x1306FE0A31B7152DE8D5A46305C85EDEC >> 128; if (x & 0x2000000000000000 > 0) result = result * 0x1172B83C7D517ADCDF7C8C50EB14A791F >> 128; if (x & 0x1000000000000000 > 0) result = result * 0x10B5586CF9890F6298B92B71842A98363 >> 128; if (x & 0x800000000000000 > 0) result = result * 0x1059B0D31585743AE7C548EB68CA417FD >> 128; if (x & 0x400000000000000 > 0) result = result * 0x102C9A3E778060EE6F7CACA4F7A29BDE8 >> 128; if (x & 0x200000000000000 > 0) result = result * 0x10163DA9FB33356D84A66AE336DCDFA3F >> 128; if (x & 0x100000000000000 > 0) result = result * 0x100B1AFA5ABCBED6129AB13EC11DC9543 >> 128; if (x & 0x80000000000000 > 0) result = result * 0x10058C86DA1C09EA1FF19D294CF2F679B >> 128; if (x & 0x40000000000000 > 0) result = result * 0x1002C605E2E8CEC506D21BFC89A23A00F >> 128; if (x & 0x20000000000000 > 0) result = result * 0x100162F3904051FA128BCA9C55C31E5DF >> 128; if (x & 0x10000000000000 > 0) result = result * 0x1000B175EFFDC76BA38E31671CA939725 >> 128; if (x & 0x8000000000000 > 0) result = result * 0x100058BA01FB9F96D6CACD4B180917C3D >> 128; if (x & 0x4000000000000 > 0) result = result * 0x10002C5CC37DA9491D0985C348C68E7B3 >> 128; if (x & 0x2000000000000 > 0) result = result * 0x1000162E525EE054754457D5995292026 >> 128; if (x & 0x1000000000000 > 0) result = result * 0x10000B17255775C040618BF4A4ADE83FC >> 128; if (x & 0x800000000000 > 0) result = result * 0x1000058B91B5BC9AE2EED81E9B7D4CFAB >> 128; if (x & 0x400000000000 > 0) result = result * 0x100002C5C89D5EC6CA4D7C8ACC017B7C9 >> 128; if (x & 0x200000000000 > 0) result = result * 0x10000162E43F4F831060E02D839A9D16D >> 128; if (x & 0x100000000000 > 0) result = result * 0x100000B1721BCFC99D9F890EA06911763 >> 128; if (x & 0x80000000000 > 0) result = result * 0x10000058B90CF1E6D97F9CA14DBCC1628 >> 128; if (x & 0x40000000000 > 0) result = result * 0x1000002C5C863B73F016468F6BAC5CA2B >> 128; if (x & 0x20000000000 > 0) result = result * 0x100000162E430E5A18F6119E3C02282A5 >> 128; if (x & 0x10000000000 > 0) result = result * 0x1000000B1721835514B86E6D96EFD1BFE >> 128; if (x & 0x8000000000 > 0) result = result * 0x100000058B90C0B48C6BE5DF846C5B2EF >> 128; if (x & 0x4000000000 > 0) result = result * 0x10000002C5C8601CC6B9E94213C72737A >> 128; if (x & 0x2000000000 > 0) result = result * 0x1000000162E42FFF037DF38AA2B219F06 >> 128; if (x & 0x1000000000 > 0) result = result * 0x10000000B17217FBA9C739AA5819F44F9 >> 128; if (x & 0x800000000 > 0) result = result * 0x1000000058B90BFCDEE5ACD3C1CEDC823 >> 128; if (x & 0x400000000 > 0) result = result * 0x100000002C5C85FE31F35A6A30DA1BE50 >> 128; if (x & 0x200000000 > 0) result = result * 0x10000000162E42FF0999CE3541B9FFFCF >> 128; if (x & 0x100000000 > 0) result = result * 0x100000000B17217F80F4EF5AADDA45554 >> 128; if (x & 0x80000000 > 0) result = result * 0x10000000058B90BFBF8479BD5A81B51AD >> 128; if (x & 0x40000000 > 0) result = result * 0x1000000002C5C85FDF84BD62AE30A74CC >> 128; if (x & 0x20000000 > 0) result = result * 0x100000000162E42FEFB2FED257559BDAA >> 128; if (x & 0x10000000 > 0) result = result * 0x1000000000B17217F7D5A7716BBA4A9AE >> 128; if (x & 0x8000000 > 0) result = result * 0x100000000058B90BFBE9DDBAC5E109CCE >> 128; if (x & 0x4000000 > 0) result = result * 0x10000000002C5C85FDF4B15DE6F17EB0D >> 128; if (x & 0x2000000 > 0) result = result * 0x1000000000162E42FEFA494F1478FDE05 >> 128; if (x & 0x1000000 > 0) result = result * 0x10000000000B17217F7D20CF927C8E94C >> 128; if (x & 0x800000 > 0) result = result * 0x1000000000058B90BFBE8F71CB4E4B33D >> 128; if (x & 0x400000 > 0) result = result * 0x100000000002C5C85FDF477B662B26945 >> 128; if (x & 0x200000 > 0) result = result * 0x10000000000162E42FEFA3AE53369388C >> 128; if (x & 0x100000 > 0) result = result * 0x100000000000B17217F7D1D351A389D40 >> 128; if (x & 0x80000 > 0) result = result * 0x10000000000058B90BFBE8E8B2D3D4EDE >> 128; if (x & 0x40000 > 0) result = result * 0x1000000000002C5C85FDF4741BEA6E77E >> 128; if (x & 0x20000 > 0) result = result * 0x100000000000162E42FEFA39FE95583C2 >> 128; if (x & 0x10000 > 0) result = result * 0x1000000000000B17217F7D1CFB72B45E1 >> 128; if (x & 0x8000 > 0) result = result * 0x100000000000058B90BFBE8E7CC35C3F0 >> 128; if (x & 0x4000 > 0) result = result * 0x10000000000002C5C85FDF473E242EA38 >> 128; if (x & 0x2000 > 0) result = result * 0x1000000000000162E42FEFA39F02B772C >> 128; if (x & 0x1000 > 0) result = result * 0x10000000000000B17217F7D1CF7D83C1A >> 128; if (x & 0x800 > 0) result = result * 0x1000000000000058B90BFBE8E7BDCBE2E >> 128; if (x & 0x400 > 0) result = result * 0x100000000000002C5C85FDF473DEA871F >> 128; if (x & 0x200 > 0) result = result * 0x10000000000000162E42FEFA39EF44D91 >> 128; if (x & 0x100 > 0) result = result * 0x100000000000000B17217F7D1CF79E949 >> 128; if (x & 0x80 > 0) result = result * 0x10000000000000058B90BFBE8E7BCE544 >> 128; if (x & 0x40 > 0) result = result * 0x1000000000000002C5C85FDF473DE6ECA >> 128; if (x & 0x20 > 0) result = result * 0x100000000000000162E42FEFA39EF366F >> 128; if (x & 0x10 > 0) result = result * 0x1000000000000000B17217F7D1CF79AFA >> 128; if (x & 0x8 > 0) result = result * 0x100000000000000058B90BFBE8E7BCD6D >> 128; if (x & 0x4 > 0) result = result * 0x10000000000000002C5C85FDF473DE6B2 >> 128; if (x & 0x2 > 0) result = result * 0x1000000000000000162E42FEFA39EF358 >> 128; if (x & 0x1 > 0) result = result * 0x10000000000000000B17217F7D1CF79AB >> 128; result >>= uint256 (int256 (63 - (x >> 64))); require (result <= uint256 (int256 (MAX_64x64))); return int128 (int256 (result)); } } /** * Calculate natural exponent of x. Revert on overflow. * * @param x signed 64.64-bit fixed point number * @return signed 64.64-bit fixed point number */ function exp (int128 x) internal pure returns (int128) { unchecked { require (x < 0x400000000000000000); // Overflow if (x < -0x400000000000000000) return 0; // Underflow return exp_2 ( int128 (int256 (x) * 0x171547652B82FE1777D0FFDA0D23A7D12 >> 128)); } } /** * Calculate x / y rounding towards zero, where x and y are unsigned 256-bit * integer numbers. Revert on overflow or when y is zero. * * @param x unsigned 256-bit integer number * @param y unsigned 256-bit integer number * @return unsigned 64.64-bit fixed point number */ function divuu (uint256 x, uint256 y) private pure returns (uint128) { unchecked { require (y != 0); uint256 result; if (x <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF) result = (x << 64) / y; else { uint256 msb = 192; uint256 xc = x >> 192; if (xc >= 0x100000000) { xc >>= 32; msb += 32; } if (xc >= 0x10000) { xc >>= 16; msb += 16; } if (xc >= 0x100) { xc >>= 8; msb += 8; } if (xc >= 0x10) { xc >>= 4; msb += 4; } if (xc >= 0x4) { xc >>= 2; msb += 2; } if (xc >= 0x2) msb += 1; // No need to shift xc anymore result = (x << 255 - msb) / ((y - 1 >> msb - 191) + 1); require (result <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF); uint256 hi = result * (y >> 128); uint256 lo = result * (y & 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF); uint256 xh = x >> 192; uint256 xl = x << 64; if (xl < lo) xh -= 1; xl -= lo; // We rely on overflow behavior here lo = hi << 128; if (xl < lo) xh -= 1; xl -= lo; // We rely on overflow behavior here assert (xh == hi >> 128); result += xl / y; } require (result <= 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF); return uint128 (result); } } /** * Calculate sqrt (x) rounding down, where x is unsigned 256-bit integer * number. * * @param x unsigned 256-bit integer number * @return unsigned 128-bit integer number */ function sqrtu (uint256 x) private pure returns (uint128) { unchecked { if (x == 0) return 0; else { uint256 xx = x; uint256 r = 1; if (xx >= 0x100000000000000000000000000000000) { xx >>= 128; r <<= 64; } if (xx >= 0x10000000000000000) { xx >>= 64; r <<= 32; } if (xx >= 0x100000000) { xx >>= 32; r <<= 16; } if (xx >= 0x10000) { xx >>= 16; r <<= 8; } if (xx >= 0x100) { xx >>= 8; r <<= 4; } if (xx >= 0x10) { xx >>= 4; r <<= 2; } if (xx >= 0x8) { r <<= 1; } r = (r + x / r) >> 1; r = (r + x / r) >> 1; r = (r + x / r) >> 1; r = (r + x / r) >> 1; r = (r + x / r) >> 1; r = (r + x / r) >> 1; r = (r + x / r) >> 1; // Seven iterations should be enough uint256 r1 = x / r; return uint128 (r < r1 ? r : r1); } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (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 v4.7.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @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 Contracts guidelines: functions revert * instead 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 Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override 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 this function is * overridden; * * 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 virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, 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}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, 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}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, amount); 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) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, spender) + 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) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * This 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: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer( address from, address to, uint256 amount ) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; } _balances[to] += amount; emit Transfer(from, to, amount); _afterTokenTransfer(from, to, 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: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); _afterTokenTransfer(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), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address(0), amount); _afterTokenTransfer(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 { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @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 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 Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been 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 _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (interfaces/IERC165.sol) pragma solidity ^0.8.0; import "../utils/introspection/IERC165.sol";
{ "remappings": [], "optimizer": { "enabled": true, "runs": 20 }, "evmVersion": "london", "libraries": { "/contracts/XENMath.sol": { "XENMath": "0xB4609b8453bB07D540eC95d491b92bdeCB794531" } }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
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":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"rewardAmount","type":"uint256"}],"name":"MintClaimed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"term","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"rank","type":"uint256"}],"name":"RankClaimed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"term","type":"uint256"}],"name":"Staked","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"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"reward","type":"uint256"}],"name":"Withdrawn","type":"event"},{"inputs":[],"name":"AUTHORS","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DAYS_IN_YEAR","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"EAA_PM_START","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"EAA_PM_STEP","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"EAA_RANK_STEP","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"GENESIS_RANK","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_PENALTY_PCT","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_TERM_END","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_TERM_START","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MIN_TERM","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"REWARD_AMPLIFIER_END","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"REWARD_AMPLIFIER_START","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"SECONDS_IN_DAY","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TERM_AMPLIFIER","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"TERM_AMPLIFIER_THRESHOLD","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"WITHDRAWAL_WINDOW_DAYS","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"XEN_APY_DAYS_STEP","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"XEN_APY_END","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"XEN_APY_START","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"XEN_MIN_BURN","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"XEN_MIN_STAKE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"activeMinters","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"activeStakes","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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":"address","name":"user","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"claimMintReward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"other","type":"address"},{"internalType":"uint256","name":"pct","type":"uint256"}],"name":"claimMintRewardAndShare","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"pct","type":"uint256"},{"internalType":"uint256","name":"term","type":"uint256"}],"name":"claimMintRewardAndStake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"term","type":"uint256"}],"name":"claimRank","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":[],"name":"genesisTs","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCurrentAMP","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCurrentAPY","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCurrentEAAR","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCurrentMaxTerm","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"rankDelta","type":"uint256"},{"internalType":"uint256","name":"amplifier","type":"uint256"},{"internalType":"uint256","name":"term","type":"uint256"},{"internalType":"uint256","name":"eaa","type":"uint256"}],"name":"getGrossReward","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"getUserMint","outputs":[{"components":[{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"term","type":"uint256"},{"internalType":"uint256","name":"maturityTs","type":"uint256"},{"internalType":"uint256","name":"rank","type":"uint256"},{"internalType":"uint256","name":"amplifier","type":"uint256"},{"internalType":"uint256","name":"eaaRate","type":"uint256"}],"internalType":"struct XENCrypto.MintInfo","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getUserStake","outputs":[{"components":[{"internalType":"uint256","name":"term","type":"uint256"},{"internalType":"uint256","name":"maturityTs","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"apy","type":"uint256"}],"internalType":"struct XENCrypto.StakeInfo","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"globalRank","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"term","type":"uint256"}],"name":"stake","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":[],"name":"totalXenStaked","outputs":[{"internalType":"uint256","name":"","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":"","type":"address"}],"name":"userBurns","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userMints","outputs":[{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"term","type":"uint256"},{"internalType":"uint256","name":"maturityTs","type":"uint256"},{"internalType":"uint256","name":"rank","type":"uint256"},{"internalType":"uint256","name":"amplifier","type":"uint256"},{"internalType":"uint256","name":"eaaRate","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"userStakes","outputs":[{"internalType":"uint256","name":"term","type":"uint256"},{"internalType":"uint256","name":"maturityTs","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"apy","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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