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Contract

0x53bAe8DE006057754d30316Ca7c0a701AcD6BF22
 

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0 ETH

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TokenTracker

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Approve Usage265294232025-10-30 23:57:4187 days ago1761868661IN
0x53bAe8DE...1AcD6BF22
0 ETH00.00000063
Allocate243014102025-09-09 10:10:35138 days ago1757412635IN
0x53bAe8DE...1AcD6BF22
0 ETH00.00000254
Convert243013142025-09-09 10:07:23138 days ago1757412443IN
0x53bAe8DE...1AcD6BF22
0 ETH00.00000273
Convert243012472025-09-09 10:05:09138 days ago1757412309IN
0x53bAe8DE...1AcD6BF22
0 ETH00.00000272
Allocate240487102025-09-03 13:47:15144 days ago1756907235IN
0x53bAe8DE...1AcD6BF22
0 ETH00.00000514
Convert240486842025-09-03 13:46:23144 days ago1756907183IN
0x53bAe8DE...1AcD6BF22
0 ETH00.00000472
Allocate237927842025-08-28 15:36:23150 days ago1756395383IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000000030.0002096
Convert237927502025-08-28 15:35:15150 days ago1756395315IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000000010.00021014
Allocate227565242025-08-04 15:54:23174 days ago1754322863IN
0x53bAe8DE...1AcD6BF22
0 ETH00.00000982
Convert227564042025-08-04 15:50:23174 days ago1754322623IN
0x53bAe8DE...1AcD6BF22
0 ETH00.00000976
Allocate217299992025-07-11 21:36:53198 days ago1752269813IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000000030.00016601
Convert217299612025-07-11 21:35:37198 days ago1752269737IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000000010.00016977
Finalize Redeem165928792025-03-14 23:39:33317 days ago1741995573IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000000150.0013333
Redeem162805102025-03-07 18:07:15324 days ago1741370835IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000000710.00020375
Redeem152950752025-02-12 22:39:25347 days ago1739399965IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000000670.00347988
Deallocate152950502025-02-12 22:38:35347 days ago1739399915IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000000560.00344246
Approve Usage140698002025-01-15 13:56:55375 days ago1736949415IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000005720.001294
Finalize Redeem137165492025-01-07 9:41:53383 days ago1736242913IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000000120.00128232
Finalize Redeem135218122025-01-02 21:30:39388 days ago1735853439IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000000180.00109748
Redeem124311742024-12-08 15:36:03413 days ago1733672163IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000001160.00434619
Redeem123796432024-12-07 10:58:21414 days ago1733569101IN
0x53bAe8DE...1AcD6BF22
0 ETH0.00000080.00165393
Finalize Redeem122726772024-12-04 23:32:49417 days ago1733355169IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000001150.0012008
Finalize Redeem122583622024-12-04 15:35:39417 days ago1733326539IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000000940.007
Redeem122479282024-12-04 9:47:51417 days ago1733305671IN
0x53bAe8DE...1AcD6BF22
0 ETH0.000001890.00234142
Deallocate122478152024-12-04 9:44:05417 days ago1733305445IN
0x53bAe8DE...1AcD6BF22
0 ETH0.00000250.00226332
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0xEfB5cAf7...575640f3C
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
XToken

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
Yes with 10 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 13 : XToken.sol
// SPDX-License-Identifier: MIT
pragma solidity =0.7.6;

import "@openzeppelin/contracts:076/access/Ownable.sol";
import "@openzeppelin/contracts:076/math/SafeMath.sol";
import "@openzeppelin/contracts:076/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts:076/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts:076/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts:076/utils/EnumerableSet.sol";
import "@openzeppelin/contracts:076/token/ERC20/IERC20.sol";

import "./interfaces/tokens/IXToken.sol";
import "./interfaces/IXTokenUsage.sol";
import "./interfaces/IBlast.sol";


/*
 * xToken is a generalized implementation of Camelot xGrail
 * It's non-transferable, except from/to whitelisted addresses
 * It can be converted back to Token through a vesting process
 * This contract is made to receive xToken deposits from users in order to allocate them to Usages (plugins) contracts
 * * Changes from original include:
 * - Removed deallocationFee
 * - Triggered redemptions have a time limit to avoid perpetual options to withdraw immediately while still earning yield
 * - Users can instantly redeem slightly more than 1% of their position every 12 hours
 * - Excess of underlyingTokens is sent to treasury instead of being burned
 * - Fixed bug in original contract where owner could set an invalid dividendsAddress and brick user funds
 */


contract XToken is Ownable, ReentrancyGuard, ERC20, IXToken {
  using Address for address;
  using SafeMath for uint256;
  using EnumerableSet for EnumerableSet.AddressSet;
  using SafeERC20 for IERC20;

  struct XTokenBalance {
    uint256 allocatedAmount; // Amount of xToken allocated to a Usage
    uint256 redeemingAmount; // Total amount of xToken currently being redeemed
  }

  struct RedeemInfo {
    uint256 tokenAmount; // Token amount to receive when vesting has ended
    uint256 xTokenAmount; // xToken amount to redeem
    uint256 endTime;
    IXTokenUsage dividendsAddress;
    uint256 dividendsAllocation; // Share of redeeming xToken to allocate to the Dividends Usage contract
  }

  IERC20 public immutable underlyingToken; // Token token to convert to/from
  IXTokenUsage public dividendsAddress; // Farm/dividends contract

  EnumerableSet.AddressSet private _transferWhitelist; // addresses allowed to send/receive xToken

  mapping(address => mapping(address => uint256)) public usageApprovals; // Usage approvals to allocate xToken
  mapping(address => mapping(address => uint256)) public override usageAllocations; // Active xToken allocations to usages

  uint256 public constant MAX_FIXED_RATIO = 100; // 100%

  // Redeeming min/max settings
  uint256 public minRedeemRatio = 50; // 1:0.5
  uint256 public maxRedeemRatio = 100; // 1:1
  uint256 public minRedeemDuration = 15 days;
  uint256 public maxRedeemDuration = 30 days;
  // Adjusted dividends rewards for redeeming xToken
  uint256 public redeemDividendsAdjustment; // 0% at construction to avoid bricking calls
  
  uint256 public freeRedeemPercentage = 100; //1%
  //owner-defined minimum redemption value to avoid requiring infinite mini-redemptions to exit a position
  uint256 public minFreeRedeem;
  uint256 public freeRedeemCooldown = 12 hours;
  uint256 public redemptionGracePeriod = 7 days;

  mapping(address => XTokenBalance) public xTokenBalances; // User's xToken balances
  mapping(address => RedeemInfo[]) public userRedeems; // User's redeeming instances
  mapping(address => uint256) public freeRedeemAllowances;

  address public treasuryAddress;


  constructor(IERC20 _underlyingToken, string memory name, string memory symbol, address _blast, address _governor, address _treasuryAddress) ERC20(name, symbol) {
    underlyingToken = _underlyingToken;
    _transferWhitelist.add(address(this));

    require(_treasuryAddress != address(0), "Invalid treasury address");

    treasuryAddress = _treasuryAddress;

    IBlast(_blast).configureClaimableGas();
    IBlast(_blast).configureGovernor(_governor);
  }

  /********************************************/
  /****************** EVENTS ******************/
  /********************************************/

  event ApproveUsage(address indexed userAddress, address indexed usageAddress, uint256 amount);
  event Convert(address indexed from, address to, uint256 amount);
  event UpdateRedeemSettings(
    uint256 minRedeemRatio,
    uint256 maxRedeemRatio,
    uint256 minRedeemDuration,
    uint256 maxRedeemDuration,
    uint256 redeemDividendsAdjustment,
    uint256 freeRedeemPercentage,
    uint256 minFreeRedeem,
    uint256 freeRedeemCooldown,
    uint256 redemptionGracePeriod
  );
  event UpdateDividendsAddress(address previousDividendsAddress, address newDividendsAddress);
  event SetTransferWhitelist(address account, bool add);
  event Redeem(address indexed userAddress, uint256 xTokenAmount, uint256 tokenAmount, uint256 duration);
  event FinalizeRedeem(address indexed userAddress, uint256 xTokenAmount, uint256 tokenAmount);
  event CancelRedeem(address indexed userAddress, uint256 xTokenAmount);
  event UpdateRedeemDividendsAddress(address indexed userAddress, uint256 redeemIndex, address previousDividendsAddress, address newDividendsAddress);
  event UpdateTreasuryAddress(address indexed newTreasuryAddress, address indexed oldTreasuryAddress);
  event Allocate(address indexed userAddress, address indexed usageAddress, uint256 amount);
  event Deallocate(address indexed userAddress, address indexed usageAddress, uint256 amount);

  /***********************************************/
  /****************** MODIFIERS ******************/
  /***********************************************/

  /*
   * @dev Check if a redeem entry exists
   */
  modifier validateRedeem(address userAddress, uint256 redeemIndex) {
    require(redeemIndex < userRedeems[userAddress].length, "validateRedeem: redeem entry does not exist");
    _;
  }

  /**************************************************/
  /****************** PUBLIC VIEWS ******************/
  /**************************************************/

  /*
   * @dev Returns user's xToken balances
   */
  function getXTokenBalance(address userAddress) external view returns (uint256 allocatedAmount, uint256 redeemingAmount) {
    XTokenBalance storage balance = xTokenBalances[userAddress];
    return (balance.allocatedAmount, balance.redeemingAmount);
  }

  /*
   * @dev returns redeemable Token for "amount" of xToken vested for "duration" seconds
   */
  function getTokenByVestingDuration(uint256 amount, uint256 duration) public view returns (uint256) {
    if(duration == 0) {
        return amount; //special case for small withdrawals
    }

    if(duration < minRedeemDuration) {
      return 0;
    }

    // capped to maxRedeemDuration
    if (duration > maxRedeemDuration) {
      return amount.mul(maxRedeemRatio).div(100);
    }

    uint256 ratio = minRedeemRatio.add(
      (duration.sub(minRedeemDuration)).mul(maxRedeemRatio.sub(minRedeemRatio))
      .div(maxRedeemDuration.sub(minRedeemDuration))
    );

    return amount.mul(ratio).div(100);
  }

  /**
   * @dev returns quantity of "userAddress" pending redeems
   */
  function getUserRedeemsLength(address userAddress) external view returns (uint256) {
    return userRedeems[userAddress].length;
  }

  /**
   * @dev returns "userAddress" info for a pending redeem identified by "redeemIndex"
   */
  function getUserRedeem(address userAddress, uint256 redeemIndex) external view validateRedeem(userAddress, redeemIndex) returns (uint256 tokenAmount, uint256 xTokenAmount, uint256 endTime, address dividendsContract, uint256 dividendsAllocation) {
    RedeemInfo storage _redeem = userRedeems[userAddress][redeemIndex];
    return (_redeem.tokenAmount, _redeem.xTokenAmount, _redeem.endTime, address(_redeem.dividendsAddress), _redeem.dividendsAllocation);
  }

  /**
   * @dev returns approved xToken to allocate from "userAddress" to "usageAddress"
   */
  function getUsageApproval(address userAddress, address usageAddress) external view returns (uint256) {
    return usageApprovals[userAddress][usageAddress];
  }

  /**
   * @dev returns allocated xToken from "userAddress" to "usageAddress"
   */
  function getUsageAllocation(address userAddress, address usageAddress) external view returns (uint256) {
    return usageAllocations[userAddress][usageAddress];
  }

  /**
   * @dev returns length of transferWhitelist array
   */
  function transferWhitelistLength() external view returns (uint256) {
    return _transferWhitelist.length();
  }

  /**
   * @dev returns transferWhitelist array item's address for "index"
   */
  function transferWhitelist(uint256 index) external view returns (address) {
    return _transferWhitelist.at(index);
  }

  /**
   * @dev returns if "account" is allowed to send/receive xToken
   */
  function isTransferWhitelisted(address account) external override view returns (bool) {
    return _transferWhitelist.contains(account);
  }

  /*******************************************************/
  /****************** OWNABLE FUNCTIONS ******************/
  /*******************************************************/

  /**
   * @dev Updates all redeem ratios and durations
   *
   * Must only be called by owner
   */
  function updateRedeemSettings(
    uint256 minRedeemRatio_,
    uint256 maxRedeemRatio_,
    uint256 minRedeemDuration_,
    uint256 maxRedeemDuration_,
    uint256 redeemDividendsAdjustment_,
    uint256 freeRedeemPercentage_,
    uint256 minFreeRedeem_,
    uint256 freeRedeemCooldown_,
    uint256 redemptionGracePeriod_
    ) external onlyOwner {
    require(minRedeemRatio_ <= maxRedeemRatio_, "updateRedeemSettings: wrong ratio values");
    require(minRedeemDuration_ < maxRedeemDuration_, "updateRedeemSettings: wrong duration values");
    // should never exceed 100%
    require(maxRedeemRatio_ <= MAX_FIXED_RATIO && redeemDividendsAdjustment_ <= MAX_FIXED_RATIO, "updateRedeemSettings: wrong ratio values");
    if(redeemDividendsAdjustment_ > 0) {
      require(address(dividendsAddress) != address(0), "updateRedeemSettings: dividendsAddress not initialized");
      //tests an allocation to ensure the target contract responds to specification
      dividendsAddress.allocate(address(this), 0, new bytes(0));
      dividendsAddress.deallocate(address(this), 0, new bytes(0));
    }

    require(freeRedeemPercentage_ >= 0 && freeRedeemPercentage_ <= 10000, "updateRedeemSettings: invalid redeem percentage");
    
    minRedeemRatio = minRedeemRatio_;
    maxRedeemRatio = maxRedeemRatio_;
    minRedeemDuration = minRedeemDuration_;
    maxRedeemDuration = maxRedeemDuration_;
    redeemDividendsAdjustment = redeemDividendsAdjustment_;

    freeRedeemPercentage = freeRedeemPercentage_;
    minFreeRedeem = minFreeRedeem_;
    freeRedeemCooldown = freeRedeemCooldown_;
    redemptionGracePeriod = redemptionGracePeriod_;
    

    emit UpdateRedeemSettings(
        minRedeemRatio_,
        maxRedeemRatio_,
        minRedeemDuration_,
        maxRedeemDuration_,
        redeemDividendsAdjustment_,
        freeRedeemPercentage_,
        minFreeRedeem_,
        freeRedeemCooldown_,
        redemptionGracePeriod_
    );
  }

  function updateTreasuryAddress(address _newTreasuryAddress) external onlyOwner {
    require(_newTreasuryAddress != address(0), "Invalid treasury address");
    emit UpdateTreasuryAddress(_newTreasuryAddress, treasuryAddress);
    treasuryAddress = _newTreasuryAddress;
  }

  /**
   * @dev Updates dividends contract address
   *
   * Must only be called by owner
   */
  function updateDividendsAddress(IXTokenUsage dividendsAddress_) external onlyOwner {
    // if set to 0, also set divs earnings while redeeming to 0
    if(address(dividendsAddress_) == address(0)) {
      redeemDividendsAdjustment = 0;
    } else {
      //tests an allocation to ensure the target contract responds to specification
      dividendsAddress.allocate(address(this), 0, new bytes(0));
      dividendsAddress.deallocate(address(this), 0, new bytes(0));
    }

    emit UpdateDividendsAddress(address(dividendsAddress), address(dividendsAddress_));
    dividendsAddress = dividendsAddress_;
  }


  /**
   * @dev Adds or removes addresses from the transferWhitelist
   */
  function updateTransferWhitelist(address account, bool add) external onlyOwner {
    require(account != address(this), "updateTransferWhitelist: Cannot remove xToken from whitelist");

    if(add) _transferWhitelist.add(account);
    else _transferWhitelist.remove(account);

    emit SetTransferWhitelist(account, add);
  }

  /*****************************************************************/
  /******************  EXTERNAL PUBLIC FUNCTIONS  ******************/
  /*****************************************************************/

  /**
   * @dev Approves "usage" address to get allocations up to "amount" of xToken from msg.sender
   */
  function approveUsage(IXTokenUsage usage, uint256 amount) external nonReentrant {
    require(address(usage) != address(0), "approveUsage: approve to the zero address");

    usageApprovals[msg.sender][address(usage)] = amount;
    emit ApproveUsage(msg.sender, address(usage), amount);
  }

  /**
   * @dev Convert caller's "amount" of Token to xToken
   */
  function convert(uint256 amount) external nonReentrant {
    _convert(amount, msg.sender);
  }

  /**
   * @dev Convert caller's "amount" of Token to xToken to "to" address
   */
  function convertTo(uint256 amount, address to) external override nonReentrant {
    require(address(msg.sender).isContract(), "convertTo: not allowed");
    _convert(amount, to);
  }

  /**
   * @dev Initiates redeem process (xToken to Token)
   *
   * Handles dividends' compensation allocation during the vesting process if needed
   */
  function redeem(uint256 xTokenAmount, uint256 duration) external nonReentrant {
    require(xTokenAmount > 0, "redeem: xTokenAmount cannot be null");

    XTokenBalance storage balance = xTokenBalances[msg.sender];
    {
        //instant free redeem check
        //use total balance for percentages
        //call reverts if user tries to redeem more than the free balance
        uint256 lastUserRedemption = freeRedeemAllowances[msg.sender];
        uint256 userTotalBalance = super.balanceOf(msg.sender).add(balance.allocatedAmount).add(balance.redeemingAmount);


        uint256 freeAllowance = (userTotalBalance.mul(freeRedeemPercentage) / 10000).add(minFreeRedeem);
        
        if( duration != 0 
        || _currentBlockTimestamp() < lastUserRedemption + freeRedeemCooldown 
        || xTokenAmount > freeAllowance) {
            require(duration >= minRedeemDuration, "redeem: invalid request");
        }
    }    

    _transfer(msg.sender, address(this), xTokenAmount);

    // get corresponding Token amount
    uint256 tokenAmount = getTokenByVestingDuration(xTokenAmount, duration);
    emit Redeem(msg.sender, xTokenAmount, tokenAmount, duration);

    // if redeeming is not immediate, go through vesting process
    if(duration > 0) {
        // add to SBT total
        balance.redeemingAmount = balance.redeemingAmount.add(xTokenAmount);

        // handle dividends during the vesting process
        uint256 dividendsAllocation = xTokenAmount.mul(redeemDividendsAdjustment).div(100);
        // only if compensation is active
        if(dividendsAllocation > 0) {
            // allocate to dividends
            dividendsAddress.allocate(msg.sender, dividendsAllocation, new bytes(0));
        }

        // add redeeming entry
        userRedeems[msg.sender].push(RedeemInfo(tokenAmount, xTokenAmount, _currentBlockTimestamp().add(duration), dividendsAddress, dividendsAllocation));
    } else {
        //updates timestamp for cooldown
        freeRedeemAllowances[msg.sender] = _currentBlockTimestamp();
        // immediately redeem for underlyingToken
        _finalizeRedeem(msg.sender, xTokenAmount, tokenAmount);
    }
  }

  /**
   * @dev Finalizes redeem process when vesting duration has been reached
   *
   * Can only be called by the redeem entry owner
   */
  function finalizeRedeem(uint256 redeemIndex) external nonReentrant validateRedeem(msg.sender, redeemIndex) {
    XTokenBalance storage balance = xTokenBalances[msg.sender];
    RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex];
    require(_currentBlockTimestamp() >= _redeem.endTime, "finalizeRedeem: vesting duration has not ended yet");
    //Introduce a limit to redemptions to avoid giving free options. Users must cancel and restart redemption
    require(_currentBlockTimestamp() <= _redeem.endTime + redemptionGracePeriod, "finalizeRedeem: grace period expired");

    // remove from SBT total
    balance.redeemingAmount = balance.redeemingAmount.sub(_redeem.xTokenAmount);
    _finalizeRedeem(msg.sender, _redeem.xTokenAmount, _redeem.tokenAmount);

    // handle dividends compensation if any was active
    if(_redeem.dividendsAllocation > 0) {
      // deallocate from dividends
      IXTokenUsage(_redeem.dividendsAddress).deallocate(msg.sender, _redeem.dividendsAllocation, new bytes(0));
    }

    // remove redeem entry
    _deleteRedeemEntry(redeemIndex);
  }

  /**
   * @dev Updates dividends address for an existing active redeeming process
   *
   * Can only be called by the involved user
   * Should only be used if dividends contract was to be migrated
   */
  function updateRedeemDividendsAddress(uint256 redeemIndex) external nonReentrant validateRedeem(msg.sender, redeemIndex) {
    RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex];

    // only if the active dividends contract is not the same anymore
    if(dividendsAddress != _redeem.dividendsAddress && address(dividendsAddress) != address(0)) {
      if(_redeem.dividendsAllocation > 0) {
        // deallocate from old dividends contract
        _redeem.dividendsAddress.deallocate(msg.sender, _redeem.dividendsAllocation, new bytes(0));
        // allocate to new used dividends contract
        dividendsAddress.allocate(msg.sender, _redeem.dividendsAllocation, new bytes(0));
      }

      emit UpdateRedeemDividendsAddress(msg.sender, redeemIndex, address(_redeem.dividendsAddress), address(dividendsAddress));
      _redeem.dividendsAddress = dividendsAddress;
    }
  }

  /**
   * @dev Cancels an ongoing redeem entry
   *
   * Can only be called by its owner
   */
  function cancelRedeem(uint256 redeemIndex) external nonReentrant validateRedeem(msg.sender, redeemIndex) {
    XTokenBalance storage balance = xTokenBalances[msg.sender];
    RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex];

    // make redeeming xToken available again
    balance.redeemingAmount = balance.redeemingAmount.sub(_redeem.xTokenAmount);
    _transfer(address(this), msg.sender, _redeem.xTokenAmount);

    // handle dividends compensation if any was active
    if(_redeem.dividendsAllocation > 0) {
      // deallocate from dividends
      IXTokenUsage(_redeem.dividendsAddress).deallocate(msg.sender, _redeem.dividendsAllocation, new bytes(0));
    }

    emit CancelRedeem(msg.sender, _redeem.xTokenAmount);

    // remove redeem entry
    _deleteRedeemEntry(redeemIndex);
  }


  /**
   * @dev Allocates caller's "amount" of available xToken to "usageAddress" contract
   *
   * args specific to usage contract must be passed into "usageData"
   */
  function allocate(address usageAddress, uint256 amount, bytes calldata usageData) external nonReentrant {
    _allocate(msg.sender, usageAddress, amount);

    // allocates xToken to usageContract
    IXTokenUsage(usageAddress).allocate(msg.sender, amount, usageData);
  }

  /**
   * @dev Allocates "amount" of available xToken from "userAddress" to caller (ie usage contract)
   *
   * Caller must have an allocation approval for the required xToken from "userAddress"
   */
  function allocateFromUsage(address userAddress, uint256 amount) external override nonReentrant {
    _allocate(userAddress, msg.sender, amount);
  }

  /**
   * @dev Deallocates caller's "amount" of available xToken from "usageAddress" contract
   *
   * args specific to usage contract must be passed into "usageData"
   */
  function deallocate(address usageAddress, uint256 amount, bytes calldata usageData) external nonReentrant {
    _deallocate(msg.sender, usageAddress, amount);

    // deallocate xToken into usageContract
    IXTokenUsage(usageAddress).deallocate(msg.sender, amount, usageData);
  }

  /**
   * @dev Deallocates "amount" of allocated xToken belonging to "userAddress" from caller (ie usage contract)
   *
   * Caller can only deallocate xToken from itself
   */
  function deallocateFromUsage(address userAddress, uint256 amount) external override nonReentrant {
    _deallocate(userAddress, msg.sender, amount);
  }

  /********************************************************/
  /****************** INTERNAL FUNCTIONS ******************/
  /********************************************************/

  /**
   * @dev Convert caller's "amount" of Token into xToken to "to"
   */
  function _convert(uint256 amount, address to) internal {
    require(amount != 0, "convert: amount cannot be null");

    // mint new xToken
    _mint(to, amount);

    emit Convert(msg.sender, to, amount);
    underlyingToken.safeTransferFrom(msg.sender, address(this), amount);
  }

  /**
   * @dev Finalizes the redeeming process for "userAddress" by transferring him "tokenAmount" and removing "xTokenAmount" from supply
   *
   * Any vesting check should be ran before calling this
   * Token excess is automatically burnt
   */
  function _finalizeRedeem(address userAddress, uint256 xTokenAmount, uint256 tokenAmount) internal {
    uint256 tokenExcess = xTokenAmount.sub(tokenAmount);

    // sends due tokens
    underlyingToken.safeTransfer(userAddress, tokenAmount);

    // sends excess tokens to treasury
    if(tokenExcess > 0) {
      underlyingToken.safeTransfer(treasuryAddress, tokenExcess);
    }
    _burn(address(this), xTokenAmount);

    emit FinalizeRedeem(userAddress, xTokenAmount, tokenAmount);
  }

  /**
   * @dev Allocates "userAddress" user's "amount" of available xToken to "usageAddress" contract
   *
   */
  function _allocate(address userAddress, address usageAddress, uint256 amount) internal {
    require(amount > 0, "allocate: amount cannot be null");

    XTokenBalance storage balance = xTokenBalances[userAddress];

    // approval checks if allocation request amount has been approved by userAddress to be allocated to this usageAddress
    uint256 approvedXToken = usageApprovals[userAddress][usageAddress];
    require(approvedXToken >= amount, "allocate: non authorized amount");

    // remove allocated amount from usage's approved amount
    usageApprovals[userAddress][usageAddress] = approvedXToken.sub(amount);

    // update usage's allocatedAmount for userAddress
    usageAllocations[userAddress][usageAddress] = usageAllocations[userAddress][usageAddress].add(amount);

    // adjust user's xToken balances
    balance.allocatedAmount = balance.allocatedAmount.add(amount);
    _transfer(userAddress, address(this), amount);

    emit Allocate(userAddress, usageAddress, amount);
  }

  /**
   * @dev Deallocates "amount" of available xToken to "usageAddress" contract
   *
   * args specific to usage contract must be passed into "usageData"
   */
  function _deallocate(address userAddress, address usageAddress, uint256 amount) internal {
    require(amount > 0, "deallocate: amount cannot be null");

    // check if there is enough allocated xToken to this usage to deallocate
    uint256 allocatedAmount = usageAllocations[userAddress][usageAddress];
    require(allocatedAmount >= amount, "deallocate: non authorized amount");

    // remove deallocated amount from usage's allocation
    usageAllocations[userAddress][usageAddress] = allocatedAmount.sub(amount);

    // adjust user's xToken balances
    XTokenBalance storage balance = xTokenBalances[userAddress];
    balance.allocatedAmount = balance.allocatedAmount.sub(amount);
    _transfer(address(this), userAddress, amount);
    
    emit Deallocate(userAddress, usageAddress, amount);
  }

  function _deleteRedeemEntry(uint256 index) internal {
    userRedeems[msg.sender][index] = userRedeems[msg.sender][userRedeems[msg.sender].length - 1];
    userRedeems[msg.sender].pop();
  }

  /**
   * @dev Hook override to forbid transfers except from whitelisted addresses and minting
   */
  function _beforeTokenTransfer(address from, address to, uint256 /*amount*/) internal view override {
    require(from == address(0) || _transferWhitelist.contains(from) || _transferWhitelist.contains(to), "transfer: not allowed");
  }

  /**
   * @dev Utility function to get the current block timestamp
   */
  function _currentBlockTimestamp() internal view virtual returns (uint256) {
    /* solhint-disable not-rely-on-time */
    return block.timestamp;
  }

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @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, "SafeMath: addition 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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../../utils/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.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 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 Context, 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 virtual returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual 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 virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @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:
     *
     * - `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(_msgSender(), 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(_msgSender(), 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, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount 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(_msgSender(), spender, _allowances[_msgSender()][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(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "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), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount 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 {
        require(account != address(0), "ERC20: mint to the zero address");

        _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), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _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 {
        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 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 virtual {
        _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 { }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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 {
    // 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];
    }

    // Bytes32Set

    struct Bytes32Set {
        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(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, 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(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set 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(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, 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(uint160(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(uint160(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(uint160(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(uint160(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));
    }
}

File 10 of 13 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

pragma solidity >= 0.5;


interface IBlast {

    enum YieldMode {
        AUTOMATIC,
        VOID,
        CLAIMABLE
    }

    enum GasMode {
        VOID,
        CLAIMABLE
    }

    // configure
    function configureContract(address contractAddress, YieldMode _yield, GasMode gasMode, address governor) external;
    function configure(YieldMode _yield, GasMode gasMode, address governor) external;

    // base configuration options
    function configureClaimableYield() external;
    function configureClaimableYieldOnBehalf(address contractAddress) external;
    function configureAutomaticYield() external;
    function configureAutomaticYieldOnBehalf(address contractAddress) external;
    function configureVoidYield() external;
    function configureVoidYieldOnBehalf(address contractAddress) external;
    function configureClaimableGas() external;
    function configureClaimableGasOnBehalf(address contractAddress) external;
    function configureVoidGas() external;
    function configureVoidGasOnBehalf(address contractAddress) external;
    function configureGovernor(address _governor) external;
    function configureGovernorOnBehalf(address _newGovernor, address contractAddress) external;

    // claim yield
    function claimYield(address contractAddress, address recipientOfYield, uint256 amount) external returns (uint256);
    function claimAllYield(address contractAddress, address recipientOfYield) external returns (uint256);

    // claim gas
    function claimAllGas(address contractAddress, address recipientOfGas) external returns (uint256);
    function claimGasAtMinClaimRate(address contractAddress, address recipientOfGas, uint256 minClaimRateBips) external returns (uint256);
    function claimMaxGas(address contractAddress, address recipientOfGas) external returns (uint256);
    function claimGas(address contractAddress, address recipientOfGas, uint256 gasToClaim, uint256 gasSecondsToConsume) external returns (uint256);

    // read functions
    function readClaimableYield(address contractAddress) external view returns (uint256);
    function readYieldConfiguration(address contractAddress) external view returns (uint8);
    function readGasParams(address contractAddress) external view returns (uint256 etherSeconds, uint256 etherBalance, uint256 lastUpdated, GasMode);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6;

interface IXTokenUsage {
    function allocate(address userAddress, uint256 amount, bytes calldata data) external;
    function deallocate(address userAddress, uint256 amount, bytes calldata data) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.7.6;

import "@openzeppelin/contracts:076/token/ERC20/IERC20.sol";

interface IXToken is IERC20 {
  function usageAllocations(address userAddress, address usageAddress) external view returns (uint256 allocation);

  function allocateFromUsage(address userAddress, uint256 amount) external;
  function convertTo(uint256 amount, address to) external;
  function deallocateFromUsage(address userAddress, uint256 amount) external;

  function isTransferWhitelisted(address account) external view returns (bool);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 10
  },
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

API
[{"inputs":[{"internalType":"contract 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IXTokenUsage","name":"dividendsAddress","type":"address"},{"internalType":"uint256","name":"dividendsAllocation","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"xTokenBalances","outputs":[{"internalType":"uint256","name":"allocatedAmount","type":"uint256"},{"internalType":"uint256","name":"redeemingAmount","type":"uint256"}],"stateMutability":"view","type":"function"}]

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.