FTM Price: $1.00 (-1.09%)
Gas: 111 GWei

Contract

0xF208C107183095edd52C2a5E33f96Fd2d2Be3C49
 

Multichain Info

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Transaction Hash
Method
Block
From
To
Value
Advance218695262021-11-12 21:33:22866 days ago1636752802IN
0xF208C107...2d2Be3C49
0 FTM0.01471324141.592
Advance204841832021-10-29 20:33:55880 days ago1635539635IN
0xF208C107...2d2Be3C49
0 FTM0.0127593122.9125
Advance191877902021-10-15 20:36:39894 days ago1634330199IN
0xF208C107...2d2Be3C49
0 FTM0.02046889197.38
Advance180894192021-10-01 20:34:24908 days ago1633120464IN
0xF208C107...2d2Be3C49
0 FTM0.00435065164.461
Advance172053342021-09-17 20:45:40922 days ago1631911540IN
0xF208C107...2d2Be3C49
0 FTM0.01262653122.0038
Advance166733522021-09-08 12:09:44932 days ago1631102984IN
0xF208C107...2d2Be3C49
0 FTM0.00302686114.4199
Advance150897582021-08-20 20:59:54950 days ago1629493194IN
0xF208C107...2d2Be3C49
0 FTM0.0102331261.2
0x61012060147607822021-08-16 19:42:20955 days ago1629142940IN
 Create: FarmingPool
0 FTM0.042732350.00000001

Latest 1 internal transaction

Parent Txn Hash Block From To Value
147607822021-08-16 19:42:20955 days ago1629142940  Contract Creation0 FTM
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Contract Source Code Verified (Exact Match)

Contract Name:
FarmingPool

Compiler Version
v0.6.6+commit.6c089d02

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 8 : FarmingPool.sol
pragma solidity =0.6.6;

import "./Distributor.sol";
import "./interfaces/IBorrowTracker.sol";
import "./interfaces/IVester.sol";
import "./libraries/Math.sol";

// ASSUMTPIONS:
// - advance is called at least once for each epoch
// - farmingPool shares edits are effective starting from the next epoch

contract FarmingPool is IBorrowTracker, Distributor {
    address public immutable borrowable;

    uint public immutable vestingBegin;
    uint public immutable segmentLength;

    uint public epochBegin;
    uint public epochAmount;
    uint public lastUpdate;

    event UpdateShareIndex(uint shareIndex);
    event Advance(uint epochBegin, uint epochAmount);

    constructor(
        address tarot_,
        address claimable_,
        address borrowable_,
        address vester_
    ) public Distributor(tarot_, claimable_) {
        borrowable = borrowable_;
        uint _vestingBegin = IVester(vester_).vestingBegin();
        vestingBegin = _vestingBegin;
        segmentLength = IVester(vester_).vestingEnd().sub(_vestingBegin).div(IVester(vester_).segments());
    }

    function updateShareIndex() public virtual override returns (uint _shareIndex) {
        if (totalShares == 0) return shareIndex;
        if (epochBegin == 0) return shareIndex;
        uint epochEnd = epochBegin + segmentLength;
        uint blockTimestamp = getBlockTimestamp();
        uint timestamp = Math.min(blockTimestamp, epochEnd);
        uint timeElapsed = timestamp - lastUpdate;
        assert(timeElapsed <= segmentLength);
        if (timeElapsed == 0) return shareIndex;

        uint amount = epochAmount.mul(timeElapsed).div(segmentLength);
        _shareIndex = amount.mul(2**160).div(totalShares).add(shareIndex);
        shareIndex = _shareIndex;
        lastUpdate = timestamp;
        emit UpdateShareIndex(_shareIndex);
    }

    function advance() public nonReentrant {
        uint blockTimestamp = getBlockTimestamp();
        if (blockTimestamp < vestingBegin) return;
        uint _epochBegin = epochBegin;
        if (_epochBegin != 0 && blockTimestamp < _epochBegin + segmentLength) return;
        uint amount = IClaimable(claimable).claim();
        if (amount == 0) return;
        updateShareIndex();
        uint timeSinceBeginning = blockTimestamp - vestingBegin;
        epochBegin = blockTimestamp.sub(timeSinceBeginning.mod(segmentLength));
        epochAmount = amount;
        lastUpdate = epochBegin;
        emit Advance(epochBegin, epochAmount);
    }

    function claimInternal(address account) internal override returns (uint amount) {
        advance();
        return super.claimInternal(account);
    }

    function claimAccount(address account) external returns (uint amount) {
        return claimInternal(account);
    }

    function trackBorrow(
        address borrower,
        uint borrowBalance,
        uint borrowIndex
    ) external override {
        require(msg.sender == borrowable, "FarmingPool: UNAUTHORIZED");
        uint newShares = borrowBalance.mul(2**96).div(borrowIndex);
        editRecipientInternal(borrower, newShares);
    }

    function getBlockTimestamp() public view virtual returns (uint) {
        return block.timestamp;
    }
}

File 2 of 8 : Distributor.sol
pragma solidity =0.6.6;

import "./libraries/SafeMath.sol";
import "./interfaces/ITarot.sol";
import "./interfaces/IClaimable.sol";

abstract contract Distributor is IClaimable {
    using SafeMath for uint;

    address public immutable tarot;
    address public immutable claimable;

    struct Recipient {
        uint shares;
        uint lastShareIndex;
        uint credit;
    }
    mapping(address => Recipient) public recipients;

    uint public totalShares;
    uint public shareIndex;

    event UpdateShareIndex(uint shareIndex);
    event UpdateCredit(address indexed account, uint lastShareIndex, uint credit);
    event Claim(address indexed account, uint amount);
    event EditRecipient(address indexed account, uint shares, uint totalShares);

    constructor(address tarot_, address claimable_) public {
        tarot = tarot_;
        claimable = claimable_;
    }

    function updateShareIndex() public virtual nonReentrant returns (uint _shareIndex) {
        if (totalShares == 0) return shareIndex;
        uint amount = IClaimable(claimable).claim();
        if (amount == 0) return shareIndex;
        _shareIndex = amount.mul(2**160).div(totalShares).add(shareIndex);
        shareIndex = _shareIndex;
        emit UpdateShareIndex(_shareIndex);
    }

    function updateCredit(address account) public returns (uint credit) {
        uint _shareIndex = updateShareIndex();
        if (_shareIndex == 0) return 0;
        Recipient storage recipient = recipients[account];
        credit = recipient.credit + _shareIndex.sub(recipient.lastShareIndex).mul(recipient.shares) / 2**160;
        recipient.lastShareIndex = _shareIndex;
        recipient.credit = credit;
        emit UpdateCredit(account, _shareIndex, credit);
    }

    function claimInternal(address account) internal virtual returns (uint amount) {
        amount = updateCredit(account);
        if (amount > 0) {
            recipients[account].credit = 0;
            ITarot(tarot).transfer(account, amount);
            emit Claim(account, amount);
        }
    }

    function claim() external virtual override returns (uint amount) {
        return claimInternal(msg.sender);
    }

    function editRecipientInternal(address account, uint shares) internal {
        updateCredit(account);
        Recipient storage recipient = recipients[account];
        uint prevShares = recipient.shares;
        uint _totalShares = shares > prevShares
            ? totalShares.add(shares - prevShares)
            : totalShares.sub(prevShares - shares);
        totalShares = _totalShares;
        recipient.shares = shares;
        emit EditRecipient(account, shares, _totalShares);
    }

    // Prevents a contract from calling itself, directly or indirectly.
    bool internal _notEntered = true;
    modifier nonReentrant() {
        require(_notEntered, "Distributor: REENTERED");
        _notEntered = false;
        _;
        _notEntered = true;
    }
}

File 3 of 8 : IBorrowTracker.sol
pragma solidity >=0.5.0;

interface IBorrowTracker {
    function trackBorrow(
        address borrower,
        uint borrowBalance,
        uint borrowIndex
    ) external;
}

File 4 of 8 : IVester.sol
pragma solidity >=0.5.0;

interface IVester {
    function segments() external pure returns (uint);

    function vestingAmount() external pure returns (uint);

    function vestingBegin() external pure returns (uint);

    function vestingEnd() external pure returns (uint);
}

File 5 of 8 : Math.sol
pragma solidity =0.6.6;

// a library for performing various math operations
// forked from: https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/libraries/Math.sol

library Math {
    function min(uint x, uint y) internal pure returns (uint z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

File 6 of 8 : SafeMath.sol
pragma solidity =0.6.6;

// From https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/math/Math.sol
// Subject to the MIT license.

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting with custom message on overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, errorMessage);

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on underflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot underflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction underflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on underflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot underflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @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,
        string memory errorMessage
    ) internal pure returns (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 0;
        }

        uint256 c = a * b;
        require(c / a == b, errorMessage);

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers.
     * Reverts 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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers.
     * Reverts with custom message 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,
        string memory errorMessage
    ) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

File 7 of 8 : ITarot.sol
pragma solidity =0.6.6;

//IERC20
interface ITarot {
    function balanceOf(address account) external view returns (uint);

    function transfer(address dst, uint rawAmount) external returns (bool);
}

File 8 of 8 : IClaimable.sol
pragma solidity =0.6.6;

interface IClaimable {
    function claim() external returns (uint amount);

    event Claim(address indexed account, uint amount);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"tarot_","type":"address"},{"internalType":"address","name":"claimable_","type":"address"},{"internalType":"address","name":"borrowable_","type":"address"},{"internalType":"address","name":"vester_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"epochBegin","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"epochAmount","type":"uint256"}],"name":"Advance","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Claim","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"shares","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"totalShares","type":"uint256"}],"name":"EditRecipient","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"lastShareIndex","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"credit","type":"uint256"}],"name":"UpdateCredit","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"shareIndex","type":"uint256"}],"name":"UpdateShareIndex","type":"event"},{"inputs":[],"name":"advance","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"borrowable","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claim","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"claimAccount","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"claimable","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"epochAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"epochBegin","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getBlockTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastUpdate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"recipients","outputs":[{"internalType":"uint256","name":"shares","type":"uint256"},{"internalType":"uint256","name":"lastShareIndex","type":"uint256"},{"internalType":"uint256","name":"credit","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"segmentLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"shareIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tarot","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalShares","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"borrower","type":"address"},{"internalType":"uint256","name":"borrowBalance","type":"uint256"},{"internalType":"uint256","name":"borrowIndex","type":"uint256"}],"name":"trackBorrow","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"updateCredit","outputs":[{"internalType":"uint256","name":"credit","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"updateShareIndex","outputs":[{"internalType":"uint256","name":"_shareIndex","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"vestingBegin","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000c5e2b037d30a390e62180970b3aa4e91868764cd000000000000000000000000d346910e464e719476372a9e9fd0bf4ddea09c0c000000000000000000000000beb8c1266b6a561f2f10b2d242628d7ed4ba458e000000000000000000000000bec5e148fee22932b321019f39d5f9bad8e75f18

-----Decoded View---------------
Arg [0] : tarot_ (address): 0xC5e2B037D30a390e62180970B3aa4E91868764cD
Arg [1] : claimable_ (address): 0xD346910E464e719476372A9E9fd0bf4DdEa09C0C
Arg [2] : borrowable_ (address): 0xbeB8c1266B6a561F2f10B2d242628D7Ed4bA458e
Arg [3] : vester_ (address): 0xbeC5e148FeE22932B321019F39d5f9BAD8E75F18

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000c5e2b037d30a390e62180970b3aa4e91868764cd
Arg [1] : 000000000000000000000000d346910e464e719476372a9e9fd0bf4ddea09c0c
Arg [2] : 000000000000000000000000beb8c1266b6a561f2f10b2d242628d7ed4ba458e
Arg [3] : 000000000000000000000000bec5e148fee22932b321019f39d5f9bad8e75f18


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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.