Contract 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd

 
 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x85acb9c3338c3939e26f02ebbd1c5d9e795a3f0f0cc0d0a8c6058d4009271b85Flash Loan55190432021-03-09 3:46:22191 days 12 hrs ago0xaac153c1344ca14497a5dd22b1f70c28793625aa IN  0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd0 BNB0.00072463
0x7131b6eac00f05e5e20f66176faf9adddbc41a6badc63e62a1d3408773e6ff16Init55189932021-03-09 3:43:52191 days 12 hrs ago0xaac153c1344ca14497a5dd22b1f70c28793625aa IN  0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd0 BNB0.00059061
0x26ba81f1a4cf1200deddb4b6df06d3a48222df7f265fcff5c64ada929efe8a91Sync55189792021-03-09 3:43:10191 days 12 hrs ago0xaac153c1344ca14497a5dd22b1f70c28793625aa IN  0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd0 BNB0.00030376
0xd5e2b2d154cdae6d297e96cdbcef0d00765603673c7d78752fec0dc8f84f886aInit55189692021-03-09 3:42:40191 days 12 hrs ago0xaac153c1344ca14497a5dd22b1f70c28793625aa IN  0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd0 BNB0.00040031
[ Download CSV Export 
Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x4b1cf6c7b373f079533179faf17d5b3a36d5b415a3d3fda7f757755a31aa4a0e54713312021-03-07 11:59:30193 days 4 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd QYTcoin: QYT Token0 BNB
0x4b1cf6c7b373f079533179faf17d5b3a36d5b415a3d3fda7f757755a31aa4a0e54713312021-03-07 11:59:30193 days 4 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd QYTcoin: QYT Token0 BNB
0x4b1cf6c7b373f079533179faf17d5b3a36d5b415a3d3fda7f757755a31aa4a0e54713312021-03-07 11:59:30193 days 4 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd 0x18dfde99f578a0735410797e949e8d3e2afcb9d20 BNB
0x4b1cf6c7b373f079533179faf17d5b3a36d5b415a3d3fda7f757755a31aa4a0e54713312021-03-07 11:59:30193 days 4 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd BUSD-T Stablecoin0 BNB
0x4b1cf6c7b373f079533179faf17d5b3a36d5b415a3d3fda7f757755a31aa4a0e54713312021-03-07 11:59:30193 days 4 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd 0xc3bed579cab3ec29b22d9ab99f4e586af42496b90 BNB
0x4b1cf6c7b373f079533179faf17d5b3a36d5b415a3d3fda7f757755a31aa4a0e54713312021-03-07 11:59:30193 days 4 hrs ago Dodoex: V2 Proxy 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd0 BNB
0x045bf7eef4537209047f52add1f3c74b63aef3d5759e95817ff214548309a45154711312021-03-07 11:49:30193 days 4 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd QYTcoin: QYT Token0 BNB
0x045bf7eef4537209047f52add1f3c74b63aef3d5759e95817ff214548309a45154711312021-03-07 11:49:30193 days 4 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd QYTcoin: QYT Token0 BNB
0x045bf7eef4537209047f52add1f3c74b63aef3d5759e95817ff214548309a45154711312021-03-07 11:49:30193 days 4 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd 0x18dfde99f578a0735410797e949e8d3e2afcb9d20 BNB
0x045bf7eef4537209047f52add1f3c74b63aef3d5759e95817ff214548309a45154711312021-03-07 11:49:30193 days 4 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd BUSD-T Stablecoin0 BNB
0x045bf7eef4537209047f52add1f3c74b63aef3d5759e95817ff214548309a45154711312021-03-07 11:49:30193 days 4 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd 0xc3bed579cab3ec29b22d9ab99f4e586af42496b90 BNB
0x045bf7eef4537209047f52add1f3c74b63aef3d5759e95817ff214548309a45154711312021-03-07 11:49:30193 days 4 hrs ago Dodoex: V2 Proxy 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd0 BNB
0xfddfc03409f6f667c034be890844c8c636e4d738e6c007b50767fa5ad7ac074c54696062021-03-07 10:33:15193 days 5 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd QYTcoin: QYT Token0 BNB
0xfddfc03409f6f667c034be890844c8c636e4d738e6c007b50767fa5ad7ac074c54696062021-03-07 10:33:15193 days 5 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd QYTcoin: QYT Token0 BNB
0xfddfc03409f6f667c034be890844c8c636e4d738e6c007b50767fa5ad7ac074c54696062021-03-07 10:33:15193 days 5 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd 0x18dfde99f578a0735410797e949e8d3e2afcb9d20 BNB
0xfddfc03409f6f667c034be890844c8c636e4d738e6c007b50767fa5ad7ac074c54696062021-03-07 10:33:15193 days 5 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd BUSD-T Stablecoin0 BNB
0xfddfc03409f6f667c034be890844c8c636e4d738e6c007b50767fa5ad7ac074c54696062021-03-07 10:33:15193 days 5 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd 0xc3bed579cab3ec29b22d9ab99f4e586af42496b90 BNB
0xfddfc03409f6f667c034be890844c8c636e4d738e6c007b50767fa5ad7ac074c54696062021-03-07 10:33:15193 days 5 hrs ago Dodoex: V2 Proxy 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd0 BNB
0x7daf49a57a431c88802fdb81f09fc04a3d0daa3b3551e2b6dd596304c8c405b354692102021-03-07 10:13:27193 days 6 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd QYTcoin: QYT Token0 BNB
0x7daf49a57a431c88802fdb81f09fc04a3d0daa3b3551e2b6dd596304c8c405b354692102021-03-07 10:13:27193 days 6 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd QYTcoin: QYT Token0 BNB
0x7daf49a57a431c88802fdb81f09fc04a3d0daa3b3551e2b6dd596304c8c405b354692102021-03-07 10:13:27193 days 6 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd 0x18dfde99f578a0735410797e949e8d3e2afcb9d20 BNB
0x7daf49a57a431c88802fdb81f09fc04a3d0daa3b3551e2b6dd596304c8c405b354692102021-03-07 10:13:27193 days 6 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd BUSD-T Stablecoin0 BNB
0x7daf49a57a431c88802fdb81f09fc04a3d0daa3b3551e2b6dd596304c8c405b354692102021-03-07 10:13:27193 days 6 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd 0xc3bed579cab3ec29b22d9ab99f4e586af42496b90 BNB
0x7daf49a57a431c88802fdb81f09fc04a3d0daa3b3551e2b6dd596304c8c405b354692102021-03-07 10:13:27193 days 6 hrs ago Dodoex: V2 Proxy 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd0 BNB
0x3cba9a5c6d5cf2439349d63136252c9706fe164a83b39ff23e70a1e77988391254687142021-03-07 9:48:39193 days 6 hrs ago 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd QYTcoin: QYT Token0 BNB
[ Download CSV Export 
Loading

Minimal Proxy Contract for 0x8fbb3b2531dbb29d4d4bc7d6560e588f0e2ee2bd

Contract Name:
DVM

Compiler Version
v0.6.9+commit.3e3065ac

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, Apache-2.0 license
Decompile ByteCode

Contract Source Code (Solidity)

Similar Contracts
/**
 *Submitted for verification at BscScan.com on 2021-01-22
*/

// File: contracts/lib/InitializableOwnable.sol

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

/**
 * @title Ownable
 * @author DODO Breeder
 *
 * @notice Ownership related functions
 */
contract InitializableOwnable {
    address public _OWNER_;
    address public _NEW_OWNER_;
    bool internal _INITIALIZED_;

    // ============ Events ============

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

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

    // ============ Modifiers ============

    modifier notInitialized() {
        require(!_INITIALIZED_, "DODO_INITIALIZED");
        _;
    }

    modifier onlyOwner() {
        require(msg.sender == _OWNER_, "NOT_OWNER");
        _;
    }

    // ============ Functions ============

    function initOwner(address newOwner) public notInitialized {
        _INITIALIZED_ = true;
        _OWNER_ = newOwner;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        emit OwnershipTransferPrepared(_OWNER_, newOwner);
        _NEW_OWNER_ = newOwner;
    }

    function claimOwnership() public {
        require(msg.sender == _NEW_OWNER_, "INVALID_CLAIM");
        emit OwnershipTransferred(_OWNER_, _NEW_OWNER_);
        _OWNER_ = _NEW_OWNER_;
        _NEW_OWNER_ = address(0);
    }
}

// File: contracts/lib/FeeRateModel.sol



interface IFeeRateImpl {
    function getFeeRate(address pool, address trader) external view returns (uint256);
}

interface IFeeRateModel {
    function getFeeRate(address trader) external view returns (uint256);
}

contract FeeRateModel is InitializableOwnable {
    address public feeRateImpl;

    function setFeeProxy(address _feeRateImpl) public onlyOwner {
        feeRateImpl = _feeRateImpl;
    }
    
    function getFeeRate(address trader) external view returns (uint256) {
        if(feeRateImpl == address(0))
            return 0;
        return IFeeRateImpl(feeRateImpl).getFeeRate(msg.sender,trader);
    }
}

// File: contracts/intf/IERC20.sol

// This is a file copied from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/IERC20.sol


/**
 * @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);

    function decimals() external view returns (uint8);

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    /**
     * @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);
}

// File: contracts/lib/SafeMath.sol



/**
 * @title SafeMath
 * @author DODO Breeder
 *
 * @notice Math operations with safety checks that revert on error
 */
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

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

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "DIVIDING_ERROR");
        return a / b;
    }

    function divCeil(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 quotient = div(a, b);
        uint256 remainder = a - quotient * b;
        if (remainder > 0) {
            return quotient + 1;
        } else {
            return quotient;
        }
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SUB_ERROR");
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "ADD_ERROR");
        return c;
    }

    function sqrt(uint256 x) internal pure returns (uint256 y) {
        uint256 z = x / 2 + 1;
        y = x;
        while (z < y) {
            y = z;
            z = (x / z + z) / 2;
        }
    }
}

// File: contracts/lib/DecimalMath.sol


/**
 * @title DecimalMath
 * @author DODO Breeder
 *
 * @notice Functions for fixed point number with 18 decimals
 */
library DecimalMath {
    using SafeMath for uint256;

    uint256 internal constant ONE = 10**18;
    uint256 internal constant ONE2 = 10**36;

    function mulFloor(uint256 target, uint256 d) internal pure returns (uint256) {
        return target.mul(d) / (10**18);
    }

    function mulCeil(uint256 target, uint256 d) internal pure returns (uint256) {
        return target.mul(d).divCeil(10**18);
    }

    function divFloor(uint256 target, uint256 d) internal pure returns (uint256) {
        return target.mul(10**18).div(d);
    }

    function divCeil(uint256 target, uint256 d) internal pure returns (uint256) {
        return target.mul(10**18).divCeil(d);
    }

    function reciprocalFloor(uint256 target) internal pure returns (uint256) {
        return uint256(10**36).div(target);
    }

    function reciprocalCeil(uint256 target) internal pure returns (uint256) {
        return uint256(10**36).divCeil(target);
    }
}

// File: contracts/lib/SafeERC20.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 ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;

    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)
        );
    }

    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));
    }

    /**
     * @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.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "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");
        }
    }
}

// File: contracts/lib/ReentrancyGuard.sol


/**
 * @title ReentrancyGuard
 * @author DODO Breeder
 *
 * @notice Protect functions from Reentrancy Attack
 */
contract ReentrancyGuard {
    // https://solidity.readthedocs.io/en/latest/control-structures.html?highlight=zero-state#scoping-and-declarations
    // zero-state of _ENTERED_ is false
    bool private _ENTERED_;

    modifier preventReentrant() {
        require(!_ENTERED_, "REENTRANT");
        _ENTERED_ = true;
        _;
        _ENTERED_ = false;
    }
}

// File: contracts/lib/DODOMath.sol




/**
 * @title DODOMath
 * @author DODO Breeder
 *
 * @notice Functions for complex calculating. Including ONE Integration and TWO Quadratic solutions
 */
library DODOMath {
    using SafeMath for uint256;

    /*
        Integrate dodo curve from V1 to V2
        require V0>=V1>=V2>0
        res = (1-k)i(V1-V2)+ikV0*V0(1/V2-1/V1)
        let V1-V2=delta
        res = i*delta*(1-k+k(V0^2/V1/V2))

        i is the price of V-res trading pair

        support k=1 & k=0 case

        [round down]
    */
    function _GeneralIntegrate(
        uint256 V0,
        uint256 V1,
        uint256 V2,
        uint256 i,
        uint256 k
    ) internal pure returns (uint256) {
        require(V0 > 0, "TARGET_IS_ZERO");
        uint256 fairAmount = i.mul(V1.sub(V2)); // i*delta
        if (k == 0) {
            return fairAmount.div(DecimalMath.ONE);
        }
        uint256 V0V0V1V2 = DecimalMath.divFloor(V0.mul(V0).div(V1), V2);
        uint256 penalty = DecimalMath.mulFloor(k, V0V0V1V2); // k(V0^2/V1/V2)
        return DecimalMath.ONE.sub(k).add(penalty).mul(fairAmount).div(DecimalMath.ONE2);
    }

    /*
        Follow the integration function above
        i*deltaB = (Q2-Q1)*(1-k+kQ0^2/Q1/Q2)
        Assume Q2=Q0, Given Q1 and deltaB, solve Q0

        i is the price of delta-V trading pair
        give out target of V

        support k=1 & k=0 case

        [round down]
    */
    function _SolveQuadraticFunctionForTarget(
        uint256 V1,
        uint256 delta,
        uint256 i,
        uint256 k
    ) internal pure returns (uint256) {
        if (V1 == 0) {
            return 0;
        }
        if (k == 0) {
            return V1.add(DecimalMath.mulFloor(i, delta));
        }
        // V0 = V1*(1+(sqrt-1)/2k)
        // sqrt = √(1+4kidelta/V1)
        // premium = 1+(sqrt-1)/2k
        // uint256 sqrt = (4 * k).mul(i).mul(delta).div(V1).add(DecimalMath.ONE2).sqrt();
        uint256 sqrt;
        uint256 ki = (4 * k).mul(i);
        if (ki == 0) {
            sqrt = DecimalMath.ONE;
        } else if ((ki * delta) / ki == delta) {
            sqrt = (ki * delta).div(V1).add(DecimalMath.ONE2).sqrt();
        } else {
            sqrt = ki.div(V1).mul(delta).add(DecimalMath.ONE2).sqrt();
        }
        uint256 premium =
            DecimalMath.divFloor(sqrt.sub(DecimalMath.ONE), k * 2).add(DecimalMath.ONE);
        // V0 is greater than or equal to V1 according to the solution
        return DecimalMath.mulFloor(V1, premium);
    }

    /*
        Follow the integration expression above, we have:
        i*deltaB = (Q2-Q1)*(1-k+kQ0^2/Q1/Q2)
        Given Q1 and deltaB, solve Q2
        This is a quadratic function and the standard version is
        aQ2^2 + bQ2 + c = 0, where
        a=1-k
        -b=(1-k)Q1-kQ0^2/Q1+i*deltaB
        c=-kQ0^2 
        and Q2=(-b+sqrt(b^2+4(1-k)kQ0^2))/2(1-k)
        note: another root is negative, abondan

        if deltaBSig=true, then Q2>Q1, user sell Q and receive B
        if deltaBSig=false, then Q2<Q1, user sell B and receive Q
        return |Q1-Q2|

        as we only support sell amount as delta, the deltaB is always negative
        the input ideltaB is actually -ideltaB in the equation

        i is the price of delta-V trading pair

        support k=1 & k=0 case

        [round down]
    */
    function _SolveQuadraticFunctionForTrade(
        uint256 V0,
        uint256 V1,
        uint256 delta,
        uint256 i,
        uint256 k
    ) internal pure returns (uint256) {
        require(V0 > 0, "TARGET_IS_ZERO");
        if (delta == 0) {
            return 0;
        }

        if (k == 0) {
            return DecimalMath.mulFloor(i, delta) > V1 ? V1 : DecimalMath.mulFloor(i, delta);
        }

        if (k == DecimalMath.ONE) {
            // if k==1
            // Q2=Q1/(1+ideltaBQ1/Q0/Q0)
            // temp = ideltaBQ1/Q0/Q0
            // Q2 = Q1/(1+temp)
            // Q1-Q2 = Q1*(1-1/(1+temp)) = Q1*(temp/(1+temp))
            // uint256 temp = i.mul(delta).mul(V1).div(V0.mul(V0));
            uint256 temp;
            uint256 idelta = i.mul(delta);
            if (idelta == 0) {
                temp = 0;
            } else if ((idelta * V1) / idelta == V1) {
                temp = (idelta * V1).div(V0.mul(V0));
            } else {
                temp = delta.mul(V1).div(V0).mul(i).div(V0);
            }
            return V1.mul(temp).div(temp.add(DecimalMath.ONE));
        }

        // calculate -b value and sig
        // b = kQ0^2/Q1-i*deltaB-(1-k)Q1
        // part1 = (1-k)Q1 >=0
        // part2 = kQ0^2/Q1-i*deltaB >=0
        // bAbs = abs(part1-part2)
        // if part1>part2 => b is negative => bSig is false
        // if part2>part1 => b is positive => bSig is true
        uint256 part2 = k.mul(V0).div(V1).mul(V0).add(i.mul(delta)); // kQ0^2/Q1-i*deltaB
        uint256 bAbs = DecimalMath.ONE.sub(k).mul(V1); // (1-k)Q1

        bool bSig;
        if (bAbs >= part2) {
            bAbs = bAbs - part2;
            bSig = false;
        } else {
            bAbs = part2 - bAbs;
            bSig = true;
        }
        bAbs = bAbs.div(DecimalMath.ONE);

        // calculate sqrt
        uint256 squareRoot =
            DecimalMath.mulFloor(
                DecimalMath.ONE.sub(k).mul(4),
                DecimalMath.mulFloor(k, V0).mul(V0)
            ); // 4(1-k)kQ0^2
        squareRoot = bAbs.mul(bAbs).add(squareRoot).sqrt(); // sqrt(b*b+4(1-k)kQ0*Q0)

        // final res
        uint256 denominator = DecimalMath.ONE.sub(k).mul(2); // 2(1-k)
        uint256 numerator;
        if (bSig) {
            numerator = squareRoot.sub(bAbs);
        } else {
            numerator = bAbs.add(squareRoot);
        }

        uint256 V2 = DecimalMath.divCeil(numerator, denominator);
        if (V2 > V1) {
            return 0;
        } else {
            return V1 - V2;
        }
    }
}

// File: contracts/lib/PMMPricing.sol




/**
 * @title Pricing
 * @author DODO Breeder
 *
 * @notice DODO Pricing model
 */

library PMMPricing {
    using SafeMath for uint256;

    enum RState {ONE, ABOVE_ONE, BELOW_ONE}

    struct PMMState {
        uint256 i;
        uint256 K;
        uint256 B;
        uint256 Q;
        uint256 B0;
        uint256 Q0;
        RState R;
    }

    // ============ buy & sell ============

    function sellBaseToken(PMMState memory state, uint256 payBaseAmount)
        internal
        pure
        returns (uint256 receiveQuoteAmount, RState newR)
    {
        if (state.R == RState.ONE) {
            // case 1: R=1
            // R falls below one
            receiveQuoteAmount = _ROneSellBaseToken(state, payBaseAmount);
            newR = RState.BELOW_ONE;
        } else if (state.R == RState.ABOVE_ONE) {
            uint256 backToOnePayBase = state.B0.sub(state.B);
            uint256 backToOneReceiveQuote = state.Q.sub(state.Q0);
            // case 2: R>1
            // complex case, R status depends on trading amount
            if (payBaseAmount < backToOnePayBase) {
                // case 2.1: R status do not change
                receiveQuoteAmount = _RAboveSellBaseToken(state, payBaseAmount);
                newR = RState.ABOVE_ONE;
                if (receiveQuoteAmount > backToOneReceiveQuote) {
                    // [Important corner case!] may enter this branch when some precision problem happens. And consequently contribute to negative spare quote amount
                    // to make sure spare quote>=0, mannually set receiveQuote=backToOneReceiveQuote
                    receiveQuoteAmount = backToOneReceiveQuote;
                }
            } else if (payBaseAmount == backToOnePayBase) {
                // case 2.2: R status changes to ONE
                receiveQuoteAmount = backToOneReceiveQuote;
                newR = RState.ONE;
            } else {
                // case 2.3: R status changes to BELOW_ONE
                receiveQuoteAmount = backToOneReceiveQuote.add(
                    _ROneSellBaseToken(state, payBaseAmount.sub(backToOnePayBase))
                );
                newR = RState.BELOW_ONE;
            }
        } else {
            // state.R == RState.BELOW_ONE
            // case 3: R<1
            receiveQuoteAmount = _RBelowSellBaseToken(state, payBaseAmount);
            newR = RState.BELOW_ONE;
        }
    }

    function sellQuoteToken(PMMState memory state, uint256 payQuoteAmount)
        internal
        pure
        returns (uint256 receiveBaseAmount, RState newR)
    {
        if (state.R == RState.ONE) {
            receiveBaseAmount = _ROneSellQuoteToken(state, payQuoteAmount);
            newR = RState.ABOVE_ONE;
        } else if (state.R == RState.ABOVE_ONE) {
            receiveBaseAmount = _RAboveSellQuoteToken(state, payQuoteAmount);
            newR = RState.ABOVE_ONE;
        } else {
            uint256 backToOnePayQuote = state.Q0.sub(state.Q);
            uint256 backToOneReceiveBase = state.B.sub(state.B0);
            if (payQuoteAmount < backToOnePayQuote) {
                receiveBaseAmount = _RBelowSellQuoteToken(state, payQuoteAmount);
                newR = RState.BELOW_ONE;
                if (receiveBaseAmount > backToOneReceiveBase) {
                    receiveBaseAmount = backToOneReceiveBase;
                }
            } else if (payQuoteAmount == backToOnePayQuote) {
                receiveBaseAmount = backToOneReceiveBase;
                newR = RState.ONE;
            } else {
                receiveBaseAmount = backToOneReceiveBase.add(
                    _ROneSellQuoteToken(state, payQuoteAmount.sub(backToOnePayQuote))
                );
                newR = RState.ABOVE_ONE;
            }
        }
    }

    // ============ R = 1 cases ============

    function _ROneSellBaseToken(PMMState memory state, uint256 payBaseAmount)
        internal
        pure
        returns (
            uint256 // receiveQuoteToken
        )
    {
        // in theory Q2 <= targetQuoteTokenAmount
        // however when amount is close to 0, precision problems may cause Q2 > targetQuoteTokenAmount
        return
            DODOMath._SolveQuadraticFunctionForTrade(
                state.Q0,
                state.Q0,
                payBaseAmount,
                state.i,
                state.K
            );
    }

    function _ROneSellQuoteToken(PMMState memory state, uint256 payQuoteAmount)
        internal
        pure
        returns (
            uint256 // receiveBaseToken
        )
    {
        return
            DODOMath._SolveQuadraticFunctionForTrade(
                state.B0,
                state.B0,
                payQuoteAmount,
                DecimalMath.reciprocalFloor(state.i),
                state.K
            );
    }

    // ============ R < 1 cases ============

    function _RBelowSellQuoteToken(PMMState memory state, uint256 payQuoteAmount)
        internal
        pure
        returns (
            uint256 // receiveBaseToken
        )
    {
        return
            DODOMath._GeneralIntegrate(
                state.Q0,
                state.Q.add(payQuoteAmount),
                state.Q,
                DecimalMath.reciprocalFloor(state.i),
                state.K
            );
    }

    function _RBelowSellBaseToken(PMMState memory state, uint256 payBaseAmount)
        internal
        pure
        returns (
            uint256 // receiveQuoteToken
        )
    {
        return
            DODOMath._SolveQuadraticFunctionForTrade(
                state.Q0,
                state.Q,
                payBaseAmount,
                state.i,
                state.K
            );
    }

    // ============ R > 1 cases ============

    function _RAboveSellBaseToken(PMMState memory state, uint256 payBaseAmount)
        internal
        pure
        returns (
            uint256 // receiveQuoteToken
        )
    {
        return
            DODOMath._GeneralIntegrate(
                state.B0,
                state.B.add(payBaseAmount),
                state.B,
                state.i,
                state.K
            );
    }

    function _RAboveSellQuoteToken(PMMState memory state, uint256 payQuoteAmount)
        internal
        pure
        returns (
            uint256 // receiveBaseToken
        )
    {
        return
            DODOMath._SolveQuadraticFunctionForTrade(
                state.B0,
                state.B,
                payQuoteAmount,
                DecimalMath.reciprocalFloor(state.i),
                state.K
            );
    }

    // ============ Helper functions ============

    function adjustedTarget(PMMState memory state) internal pure {
        if (state.R == RState.BELOW_ONE) {
            state.Q0 = DODOMath._SolveQuadraticFunctionForTarget(
                state.Q,
                state.B.sub(state.B0),
                state.i,
                state.K
            );
        } else if (state.R == RState.ABOVE_ONE) {
            state.B0 = DODOMath._SolveQuadraticFunctionForTarget(
                state.B,
                state.Q.sub(state.Q0),
                DecimalMath.reciprocalFloor(state.i),
                state.K
            );
        }
    }

    function getMidPrice(PMMState memory state) internal pure returns (uint256) {
        if (state.R == RState.BELOW_ONE) {
            uint256 R = DecimalMath.divFloor(state.Q0.mul(state.Q0).div(state.Q), state.Q);
            R = DecimalMath.ONE.sub(state.K).add(DecimalMath.mulFloor(state.K, R));
            return DecimalMath.divFloor(state.i, R);
        } else {
            uint256 R = DecimalMath.divFloor(state.B0.mul(state.B0).div(state.B), state.B);
            R = DecimalMath.ONE.sub(state.K).add(DecimalMath.mulFloor(state.K, R));
            return DecimalMath.mulFloor(state.i, R);
        }
    }
}

// File: contracts/DODOVendingMachine/impl/DVMStorage.sol




contract DVMStorage is ReentrancyGuard {
    using SafeMath for uint256;

    bool public _IS_OPEN_TWAP_ = false;

    // ============ Core Address ============

    address public _MAINTAINER_;

    IERC20 public _BASE_TOKEN_;
    IERC20 public _QUOTE_TOKEN_;

    uint112 public _BASE_RESERVE_;
    uint112 public _QUOTE_RESERVE_;
    uint32 public _BLOCK_TIMESTAMP_LAST_;

    uint256 public _BASE_PRICE_CUMULATIVE_LAST_;

    // ============ Shares (ERC20) ============

    string public symbol;
    uint8 public decimals;
    string public name;

    uint256 public totalSupply;
    mapping(address => uint256) internal _SHARES_;
    mapping(address => mapping(address => uint256)) internal _ALLOWED_;

    // ================= Permit ======================

    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint256) public nonces;

    // ============ Variables for Pricing ============

    uint256 public _LP_FEE_RATE_;
    IFeeRateModel public _MT_FEE_RATE_MODEL_;
    uint256 public _K_;
    uint256 public _I_;


    // ============ Helper Functions ============

    function getPMMState() public view returns (PMMPricing.PMMState memory state) {
        state.i = _I_;
        state.K = _K_;
        state.B = _BASE_RESERVE_;
        state.Q = _QUOTE_RESERVE_;
        state.B0 = 0; // will be calculated in adjustedTarget
        state.Q0 = 0;
        state.R = PMMPricing.RState.ABOVE_ONE;
        PMMPricing.adjustedTarget(state);
    }

    function getPMMStateForCall() 
        external 
        view 
        returns (
            uint256 i,
            uint256 K,
            uint256 B,
            uint256 Q,
            uint256 B0,
            uint256 Q0,
            uint256 R
        )
    {
        PMMPricing.PMMState memory state = getPMMState();
        i = state.i;
        K = state.K;
        B = state.B;
        Q = state.Q;
        B0 = state.B0;
        Q0 = state.Q0;
        R = uint256(state.R);
    }

    function getMidPrice() public view returns (uint256 midPrice) {
        return PMMPricing.getMidPrice(getPMMState());
    }
}

// File: contracts/DODOVendingMachine/impl/DVMVault.sol




contract DVMVault is DVMStorage {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // ============ Events ============

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    event Mint(address indexed user, uint256 value);

    event Burn(address indexed user, uint256 value);

    // ============ View Functions ============

    function getVaultReserve() external view returns (uint256 baseReserve, uint256 quoteReserve) {
        baseReserve = _BASE_RESERVE_;
        quoteReserve = _QUOTE_RESERVE_;
    }

    function getUserFeeRate(address user) external view returns (uint256 lpFeeRate, uint256 mtFeeRate) {
        lpFeeRate = _LP_FEE_RATE_;
        mtFeeRate = _MT_FEE_RATE_MODEL_.getFeeRate(user);
    }

    // ============ Asset In ============

    function getBaseInput() public view returns (uint256 input) {
        return _BASE_TOKEN_.balanceOf(address(this)).sub(uint256(_BASE_RESERVE_));
    }

    function getQuoteInput() public view returns (uint256 input) {
        return _QUOTE_TOKEN_.balanceOf(address(this)).sub(uint256(_QUOTE_RESERVE_));
    }

    // ============ TWAP UPDATE ===========
    
    function _twapUpdate() internal {
        uint32 blockTimestamp = uint32(block.timestamp % 2**32);
        uint32 timeElapsed = blockTimestamp - _BLOCK_TIMESTAMP_LAST_;
        if (timeElapsed > 0 && _BASE_RESERVE_ != 0 && _QUOTE_RESERVE_ != 0) {
            _BASE_PRICE_CUMULATIVE_LAST_ += getMidPrice() * timeElapsed;
        }
        _BLOCK_TIMESTAMP_LAST_ = blockTimestamp;
    }

    // ============ Set States ============

    function _setReserve(uint256 baseReserve, uint256 quoteReserve) internal {
        require(baseReserve <= uint112(-1) && quoteReserve <= uint112(-1), "OVERFLOW");
        _BASE_RESERVE_ = uint112(baseReserve);
        _QUOTE_RESERVE_ = uint112(quoteReserve);

        if(_IS_OPEN_TWAP_) _twapUpdate();
    }

    function _sync() internal {
        uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this));
        uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this));
        require(baseBalance <= uint112(-1) && quoteBalance <= uint112(-1), "OVERFLOW");
        if (baseBalance != _BASE_RESERVE_) {
            _BASE_RESERVE_ = uint112(baseBalance);
        }
        if (quoteBalance != _QUOTE_RESERVE_) {
            _QUOTE_RESERVE_ = uint112(quoteBalance);
        }

        if(_IS_OPEN_TWAP_) _twapUpdate();
    }


    function sync() external preventReentrant {
        _sync();
    }

    // ============ Asset Out ============

    function _transferBaseOut(address to, uint256 amount) internal {
        if (amount > 0) {
            _BASE_TOKEN_.safeTransfer(to, amount);
        }
    }

    function _transferQuoteOut(address to, uint256 amount) internal {
        if (amount > 0) {
            _QUOTE_TOKEN_.safeTransfer(to, amount);
        }
    }

    // ============ Shares (ERC20) ============

    /**
     * @dev transfer token for a specified address
     * @param to The address to transfer to.
     * @param amount The amount to be transferred.
     */
    function transfer(address to, uint256 amount) public returns (bool) {
        require(amount <= _SHARES_[msg.sender], "BALANCE_NOT_ENOUGH");

        _SHARES_[msg.sender] = _SHARES_[msg.sender].sub(amount);
        _SHARES_[to] = _SHARES_[to].add(amount);
        emit Transfer(msg.sender, to, amount);
        return true;
    }

    /**
     * @dev Gets the balance of the specified address.
     * @param owner The address to query the the balance of.
     * @return balance An uint256 representing the amount owned by the passed address.
     */
    function balanceOf(address owner) external view returns (uint256 balance) {
        return _SHARES_[owner];
    }

    /**
     * @dev Transfer tokens from one address to another
     * @param from address The address which you want to send tokens from
     * @param to address The address which you want to transfer to
     * @param amount uint256 the amount of tokens to be transferred
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public returns (bool) {
        require(amount <= _SHARES_[from], "BALANCE_NOT_ENOUGH");
        require(amount <= _ALLOWED_[from][msg.sender], "ALLOWANCE_NOT_ENOUGH");

        _SHARES_[from] = _SHARES_[from].sub(amount);
        _SHARES_[to] = _SHARES_[to].add(amount);
        _ALLOWED_[from][msg.sender] = _ALLOWED_[from][msg.sender].sub(amount);
        emit Transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
     * @param spender The address which will spend the funds.
     * @param amount The amount of tokens to be spent.
     */
    function approve(address spender, uint256 amount) public returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) private {
        _ALLOWED_[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Function to check the amount of tokens that an owner _ALLOWED_ to a spender.
     * @param owner address The address which owns the funds.
     * @param spender address The address which will spend the funds.
     * @return A uint256 specifying the amount of tokens still available for the spender.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _ALLOWED_[owner][spender];
    }

    function _mint(address user, uint256 value) internal {
        _SHARES_[user] = _SHARES_[user].add(value);
        totalSupply = totalSupply.add(value);
        emit Mint(user, value);
        emit Transfer(address(0), user, value);
    }

    function _burn(address user, uint256 value) internal {
        _SHARES_[user] = _SHARES_[user].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Burn(user, value);
        emit Transfer(user, address(0), value);
    }

    // ============================ Permit ======================================
    
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, "DODO_DVM_LP: EXPIRED");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                DOMAIN_SEPARATOR,
                keccak256(
                    abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline)
                )
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(
            recoveredAddress != address(0) && recoveredAddress == owner,
            "DODO_DVM_LP: INVALID_SIGNATURE"
        );
        _approve(owner, spender, value);
    }
}

// File: contracts/intf/IDODOCallee.sol

interface IDODOCallee {
    function DVMSellShareCall(
        address sender,
        uint256 burnShareAmount,
        uint256 baseAmount,
        uint256 quoteAmount,
        bytes calldata data
    ) external;

    function DVMFlashLoanCall(
        address sender,
        uint256 baseAmount,
        uint256 quoteAmount,
        bytes calldata data
    ) external;

    function DPPFlashLoanCall(
        address sender,
        uint256 baseAmount,
        uint256 quoteAmount,
        bytes calldata data
    ) external;

    function CPCancelCall(
        address sender,
        uint256 amount,
        bytes calldata data
    ) external;

	function CPClaimBidCall(
        address sender,
        uint256 baseAmount,
        uint256 quoteAmount,
        bytes calldata data
    ) external;
}

// File: contracts/DODOVendingMachine/impl/DVMTrader.sol




contract DVMTrader is DVMVault {
    using SafeMath for uint256;

    // ============ Events ============

    event DODOSwap(
        address fromToken,
        address toToken,
        uint256 fromAmount,
        uint256 toAmount,
        address trader,
        address receiver
    );

    event DODOFlashLoan(
        address borrower,
        address assetTo,
        uint256 baseAmount,
        uint256 quoteAmount
    );

    // ============ Trade Functions ============

    function sellBase(address to)
        external
        preventReentrant
        returns (uint256 receiveQuoteAmount)
    {
        uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this));
        uint256 baseInput = baseBalance.sub(uint256(_BASE_RESERVE_));
        uint256 mtFee;
        (receiveQuoteAmount, mtFee) = querySellBase(tx.origin, baseInput);

        _transferQuoteOut(to, receiveQuoteAmount);
        _transferQuoteOut(_MAINTAINER_, mtFee);
        _setReserve(baseBalance, _QUOTE_TOKEN_.balanceOf(address(this)));

        emit DODOSwap(
            address(_BASE_TOKEN_),
            address(_QUOTE_TOKEN_),
            baseInput,
            receiveQuoteAmount,
            msg.sender,
            to
        );
    }

    function sellQuote(address to)
        external
        preventReentrant
        returns (uint256 receiveBaseAmount)
    {
        uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this));
        uint256 quoteInput = quoteBalance.sub(uint256(_QUOTE_RESERVE_));
        uint256 mtFee;
        (receiveBaseAmount, mtFee) = querySellQuote(tx.origin, quoteInput);

        _transferBaseOut(to, receiveBaseAmount);
        _transferBaseOut(_MAINTAINER_, mtFee);
        _setReserve(_BASE_TOKEN_.balanceOf(address(this)), quoteBalance);

        emit DODOSwap(
            address(_QUOTE_TOKEN_),
            address(_BASE_TOKEN_),
            quoteInput,
            receiveBaseAmount,
            msg.sender,
            to
        );
    }

    function flashLoan(
        uint256 baseAmount,
        uint256 quoteAmount,
        address assetTo,
        bytes calldata data
    ) external preventReentrant {
        _transferBaseOut(assetTo, baseAmount);
        _transferQuoteOut(assetTo, quoteAmount);

        if (data.length > 0)
            IDODOCallee(assetTo).DVMFlashLoanCall(msg.sender, baseAmount, quoteAmount, data);

        uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this));
        uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this));
        
        // no input -> pure loss
        require(
            baseBalance >= _BASE_RESERVE_ || quoteBalance >= _QUOTE_RESERVE_,
            "FLASH_LOAN_FAILED"
        );

        // sell quote
        if (baseBalance < _BASE_RESERVE_) {
            uint256 quoteInput = quoteBalance.sub(uint256(_QUOTE_RESERVE_));
            (uint256 receiveBaseAmount, uint256 mtFee) = querySellQuote(tx.origin, quoteInput);
            require(uint256(_BASE_RESERVE_).sub(baseBalance) <= receiveBaseAmount, "FLASH_LOAN_FAILED");

            _transferBaseOut(_MAINTAINER_, mtFee);
            emit DODOSwap(
                address(_QUOTE_TOKEN_),
                address(_BASE_TOKEN_),
                quoteInput,
                receiveBaseAmount,
                msg.sender,
                assetTo
            );
        }

        // sell base
        if (quoteBalance < _QUOTE_RESERVE_) {
            uint256 baseInput = baseBalance.sub(uint256(_BASE_RESERVE_));
            (uint256 receiveQuoteAmount, uint256 mtFee) = querySellBase(tx.origin, baseInput);
            require(uint256(_QUOTE_RESERVE_).sub(quoteBalance) <= receiveQuoteAmount, "FLASH_LOAN_FAILED");

            _transferQuoteOut(_MAINTAINER_, mtFee);
            emit DODOSwap(
                address(_BASE_TOKEN_),
                address(_QUOTE_TOKEN_),
                baseInput,
                receiveQuoteAmount,
                msg.sender,
                assetTo
            );
        }

        _sync();
        
        emit DODOFlashLoan(msg.sender, assetTo, baseAmount, quoteAmount);
    }

    // ============ Query Functions ============

    function querySellBase(address trader, uint256 payBaseAmount)
        public
        view
        returns (uint256 receiveQuoteAmount, uint256 mtFee)
    {
        (receiveQuoteAmount, ) = PMMPricing.sellBaseToken(getPMMState(), payBaseAmount);

        uint256 lpFeeRate = _LP_FEE_RATE_;
        uint256 mtFeeRate = _MT_FEE_RATE_MODEL_.getFeeRate(trader);
        mtFee = DecimalMath.mulFloor(receiveQuoteAmount, mtFeeRate);
        receiveQuoteAmount = receiveQuoteAmount
            .sub(DecimalMath.mulFloor(receiveQuoteAmount, lpFeeRate))
            .sub(mtFee);
    }

    function querySellQuote(address trader, uint256 payQuoteAmount)
        public
        view
        returns (uint256 receiveBaseAmount, uint256 mtFee)
    {
        (receiveBaseAmount, ) = PMMPricing.sellQuoteToken(getPMMState(), payQuoteAmount);

        uint256 lpFeeRate = _LP_FEE_RATE_;
        uint256 mtFeeRate = _MT_FEE_RATE_MODEL_.getFeeRate(trader);
        mtFee = DecimalMath.mulFloor(receiveBaseAmount, mtFeeRate);
        receiveBaseAmount = receiveBaseAmount
            .sub(DecimalMath.mulFloor(receiveBaseAmount, lpFeeRate))
            .sub(mtFee);
    }
}

// File: contracts/DODOVendingMachine/impl/DVMFunding.sol



contract DVMFunding is DVMVault {
    // ============ Events ============

    event BuyShares(address to, uint256 increaseShares, uint256 totalShares);

    event SellShares(address payer, address to, uint256 decreaseShares, uint256 totalShares);

    // ============ Buy & Sell Shares ============

    // buy shares [round down]
    function buyShares(address to)
        external
        preventReentrant
        returns (
            uint256 shares,
            uint256 baseInput,
            uint256 quoteInput
        )
    {
        uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this));
        uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this));
        uint256 baseReserve = _BASE_RESERVE_;
        uint256 quoteReserve = _QUOTE_RESERVE_;

        baseInput = baseBalance.sub(baseReserve);
        quoteInput = quoteBalance.sub(quoteReserve);
        require(baseInput > 0, "NO_BASE_INPUT");

        // Round down when withdrawing. Therefore, never be a situation occuring balance is 0 but totalsupply is not 0
        // But May Happen,reserve >0 But totalSupply = 0
        if (totalSupply == 0) {
            // case 1. initial supply
            require(baseBalance >= 10**3, "INSUFFICIENT_LIQUIDITY_MINED");
            shares = baseBalance; // 以免出现balance很大但shares很小的情况
        } else if (baseReserve > 0 && quoteReserve == 0) {
            // case 2. supply when quote reserve is 0
            shares = baseInput.mul(totalSupply).div(baseReserve);
        } else if (baseReserve > 0 && quoteReserve > 0) {
            // case 3. normal case
            uint256 baseInputRatio = DecimalMath.divFloor(baseInput, baseReserve);
            uint256 quoteInputRatio = DecimalMath.divFloor(quoteInput, quoteReserve);
            uint256 mintRatio = quoteInputRatio < baseInputRatio ? quoteInputRatio : baseInputRatio;
            shares = DecimalMath.mulFloor(totalSupply, mintRatio);
        }
        _mint(to, shares);
        _setReserve(baseBalance, quoteBalance);
        emit BuyShares(to, shares, _SHARES_[to]);
    }

    // sell shares [round down]
    function sellShares(
        uint256 shareAmount,
        address to,
        uint256 baseMinAmount,
        uint256 quoteMinAmount,
        bytes calldata data,
        uint256 deadline
    ) external preventReentrant returns (uint256 baseAmount, uint256 quoteAmount) {
        require(deadline >= block.timestamp, "TIME_EXPIRED");
        require(shareAmount <= _SHARES_[msg.sender], "DLP_NOT_ENOUGH");
        uint256 baseBalance = _BASE_TOKEN_.balanceOf(address(this));
        uint256 quoteBalance = _QUOTE_TOKEN_.balanceOf(address(this));
        uint256 totalShares = totalSupply;

        baseAmount = baseBalance.mul(shareAmount).div(totalShares);
        quoteAmount = quoteBalance.mul(shareAmount).div(totalShares);

        require(
            baseAmount >= baseMinAmount && quoteAmount >= quoteMinAmount,
            "WITHDRAW_NOT_ENOUGH"
        );

        _burn(msg.sender, shareAmount);
        _transferBaseOut(to, baseAmount);
        _transferQuoteOut(to, quoteAmount);
        _sync();

        if (data.length > 0) {
            IDODOCallee(to).DVMSellShareCall(
                msg.sender,
                shareAmount,
                baseAmount,
                quoteAmount,
                data
            );
        }

        emit SellShares(msg.sender, to, shareAmount, _SHARES_[msg.sender]);
    }
}

// File: contracts/DODOVendingMachine/impl/DVM.sol




/**
 * @title DODO VendingMachine
 * @author DODO Breeder
 *
 * @notice DODOVendingMachine initialization
 */
contract DVM is DVMTrader, DVMFunding {
    function init(
        address maintainer,
        address baseTokenAddress,
        address quoteTokenAddress,
        uint256 lpFeeRate,
        address mtFeeRateModel,
        uint256 i,
        uint256 k,
        bool isOpenTWAP
    ) external {
        require(baseTokenAddress != quoteTokenAddress, "BASE_QUOTE_CAN_NOT_BE_SAME");
        _BASE_TOKEN_ = IERC20(baseTokenAddress);
        _QUOTE_TOKEN_ = IERC20(quoteTokenAddress);

        require(i > 0 && i <= 10**36);
        _I_ = i;

        require(k <= 10**18);
        _K_ = k;

        _LP_FEE_RATE_ = lpFeeRate;
        _MT_FEE_RATE_MODEL_ = IFeeRateModel(mtFeeRateModel);
        _MAINTAINER_ = maintainer;

        _IS_OPEN_TWAP_ = isOpenTWAP;
        if(isOpenTWAP) _BLOCK_TIMESTAMP_LAST_ = uint32(block.timestamp % 2**32);

        string memory connect = "_";
        string memory suffix = "DLP";

        name = string(abi.encodePacked(suffix, connect, addressToShortString(address(this))));
        symbol = "DLP";
        decimals = _BASE_TOKEN_.decimals();

        // ============================== Permit ====================================
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                // keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
                0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f,
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
        // ==========================================================================
    }

    function addressToShortString(address _addr) public pure returns (string memory) {
        bytes32 value = bytes32(uint256(_addr));
        bytes memory alphabet = "0123456789abcdef";

        bytes memory str = new bytes(8);
        for (uint256 i = 0; i < 4; i++) {
            str[i * 2] = alphabet[uint8(value[i + 12] >> 4)];
            str[1 + i * 2] = alphabet[uint8(value[i + 12] & 0x0f)];
        }
        return string(str);
    }

    // ============ Version Control ============
    
    function version() external pure returns (string memory) {
        return "DVM 1.0.0";
    }
}

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Burn","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"increaseShares","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"totalShares","type":"uint256"}],"name":"BuyShares","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"borrower","type":"address"},{"indexed":false,"internalType":"address","name":"assetTo","type":"address"},{"indexed":false,"internalType":"uint256","name":"baseAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"quoteAmount","type":"uint256"}],"name":"DODOFlashLoan","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"fromToken","type":"address"},{"indexed":false,"internalType":"address","name":"toToken","type":"address"},{"indexed":false,"internalType":"uint256","name":"fromAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"toAmount","type":"uint256"},{"indexed":false,"internalType":"address","name":"trader","type":"address"},{"indexed":false,"internalType":"address","name":"receiver","type":"address"}],"name":"DODOSwap","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Mint","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"payer","type":"address"},{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"decreaseShares","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"totalShares","type":"uint256"}],"name":"SellShares","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PERMIT_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_BASE_PRICE_CUMULATIVE_LAST_","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_BASE_RESERVE_","outputs":[{"internalType":"uint112","name":"","type":"uint112"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_BASE_TOKEN_","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_BLOCK_TIMESTAMP_LAST_","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_IS_OPEN_TWAP_","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_I_","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_K_","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_LP_FEE_RATE_","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_MAINTAINER_","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_MT_FEE_RATE_MODEL_","outputs":[{"internalType":"contract IFeeRateModel","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_QUOTE_RESERVE_","outputs":[{"internalType":"uint112","name":"","type":"uint112"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_QUOTE_TOKEN_","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_addr","type":"address"}],"name":"addressToShortString","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"balance","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"buyShares","outputs":[{"internalType":"uint256","name":"shares","type":"uint256"},{"internalType":"uint256","name":"baseInput","type":"uint256"},{"internalType":"uint256","name":"quoteInput","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"baseAmount","type":"uint256"},{"internalType":"uint256","name":"quoteAmount","type":"uint256"},{"internalType":"address","name":"assetTo","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"flashLoan","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getBaseInput","outputs":[{"internalType":"uint256","name":"input","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getMidPrice","outputs":[{"internalType":"uint256","name":"midPrice","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getPMMState","outputs":[{"components":[{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"uint256","name":"K","type":"uint256"},{"internalType":"uint256","name":"B","type":"uint256"},{"internalType":"uint256","name":"Q","type":"uint256"},{"internalType":"uint256","name":"B0","type":"uint256"},{"internalType":"uint256","name":"Q0","type":"uint256"},{"internalType":"enum PMMPricing.RState","name":"R","type":"uint8"}],"internalType":"struct PMMPricing.PMMState","name":"state","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getPMMStateForCall","outputs":[{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"uint256","name":"K","type":"uint256"},{"internalType":"uint256","name":"B","type":"uint256"},{"internalType":"uint256","name":"Q","type":"uint256"},{"internalType":"uint256","name":"B0","type":"uint256"},{"internalType":"uint256","name":"Q0","type":"uint256"},{"internalType":"uint256","name":"R","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getQuoteInput","outputs":[{"internalType":"uint256","name":"input","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"getUserFeeRate","outputs":[{"internalType":"uint256","name":"lpFeeRate","type":"uint256"},{"internalType":"uint256","name":"mtFeeRate","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getVaultReserve","outputs":[{"internalType":"uint256","name":"baseReserve","type":"uint256"},{"internalType":"uint256","name":"quoteReserve","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"maintainer","type":"address"},{"internalType":"address","name":"baseTokenAddress","type":"address"},{"internalType":"address","name":"quoteTokenAddress","type":"address"},{"internalType":"uint256","name":"lpFeeRate","type":"uint256"},{"internalType":"address","name":"mtFeeRateModel","type":"address"},{"internalType":"uint256","name":"i","type":"uint256"},{"internalType":"uint256","name":"k","type":"uint256"},{"internalType":"bool","name":"isOpenTWAP","type":"bool"}],"name":"init","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"trader","type":"address"},{"internalType":"uint256","name":"payBaseAmount","type":"uint256"}],"name":"querySellBase","outputs":[{"internalType":"uint256","name":"receiveQuoteAmount","type":"uint256"},{"internalType":"uint256","name":"mtFee","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"trader","type":"address"},{"internalType":"uint256","name":"payQuoteAmount","type":"uint256"}],"name":"querySellQuote","outputs":[{"internalType":"uint256","name":"receiveBaseAmount","type":"uint256"},{"internalType":"uint256","name":"mtFee","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"sellBase","outputs":[{"internalType":"uint256","name":"receiveQuoteAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"}],"name":"sellQuote","outputs":[{"internalType":"uint256","name":"receiveBaseAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"shareAmount","type":"uint256"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"baseMinAmount","type":"uint256"},{"internalType":"uint256","name":"quoteMinAmount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"sellShares","outputs":[{"internalType":"uint256","name":"baseAmount","type":"uint256"},{"internalType":"uint256","name":"quoteAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sync","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"}]

Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
Loading
Loading
Make sure to use the "Vote Down" button for any spammy posts, and the "Vote Up" for interesting conversations.