Contract 0xaa70a5b819b4ee01f7e521a6e465a9b84303543d 1

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0x735fc979d57e90e34aff740780bea0aebb4bebab13a8b10dff9e21646965b3c6Approve87620482022-07-07 20:06:19516 days 21 hrs ago0x347ed2420e7a4d688f2551e1946b95d5b17e19fb IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305046435
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0xf4dfff876dd9fa6f93eb21b77eee425b75bd0b6efd5a32ead48d9ecee3a4c0daApprove82363512022-06-25 6:55:25529 days 10 hrs ago0x5ca0cce8af63d5e89334c4e69daa67485ba3bb69 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT4.3428
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0xa734fdc56be60b867f1bd69489e49aff9cfaeb1c2705eff6292fbfd44b61c1b0Approve78779632022-06-16 17:35:53538 days 2 mins ago0x73018870d10173ae6f71cac3047ed3b6d175f274 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
0x2941f7dcf66c9108f6f2dd3aa44e51d50db096c4060af0196a4f46bb0800e6d8Approve78396462022-06-15 19:38:43538 days 21 hrs ago0x13273cb2a41461ffa1faaa555ff0ce1eab0bacf5 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT16.7166
0x313534ff9ef816bb6937cbe057eaf600c20f411b12f6ea7e440d96c49f62d203Approve77037802022-06-12 13:48:16542 days 3 hrs ago0x2d6851f8be74e2897cc919fb2260144c0eb61f98 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
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0x4940ebd90a453996eea07b864452305091da1a56baf42b44feda9a33825e0108Approve71824062022-05-31 3:06:04554 days 14 hrs ago0x7161abed9f75dcbfa70bf4a1a8f2f4bb64f049e0 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
0xed694e9079560df6d859cee885311dec0602353d10a037a6553c6858663a6a07Approve71630722022-05-30 16:01:28555 days 1 hr ago0x33168e251beaa808ee20889755d0229fc297c750 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
0x92c3765be20c144612e2f45c8716b216dee8998f12433acea6e8ca6d6633c52fApprove71500322022-05-30 8:33:12555 days 9 hrs ago0xafde2d7a5ec8e3a46ec3dcd92985346d9d324f2a IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
0x51cb836374dfd91822fedff00058e5da98401f95468ea027109a3d829756943cApprove71272982022-05-29 19:31:44555 days 22 hrs ago0x88746558a5dacbf75f4eebd15b9911af901a6197 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
0x78a9b92fc70ebcefa43163824457db61c5e325fe2799b134d31262b71494c5e9Approve71139852022-05-29 11:54:06556 days 5 hrs ago0xab8c5a6944d830c4aa734a22b0153dffebdbb094 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT7.9605
0x36ad865c7a590f9ab744fe68918be87f67f1d252ba378a9dfdb7fe329a333c74Approve71139672022-05-29 11:53:26556 days 5 hrs ago0xab8c5a6944d830c4aa734a22b0153dffebdbb094 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
0xc9c48630f72dc49dc0238e47f8978fa18e746bb45cd71190f081301ebeb5cc12Approve69139322022-05-24 17:17:14561 days 20 mins ago0xb2a28925eb734ecaa1844c5e0f9b1ac439ad1834 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
0xfb91743c7b46a5a18cad5c5e3b049d8a7978a5e28ac39edacb909352174cf206Approve65196202022-05-15 7:12:29570 days 10 hrs ago0x2b38ae873456cfd942b23e6a346cb4e12c3e4072 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
0xf4d823b36596ded51afe5addbf564e876c3ec301f41d7d4ff9bdb2e2864159f8Approve63802452022-05-11 23:21:01573 days 18 hrs ago0x6eeeb4025549626996a11076c0026f92367ede50 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
0x68edc5d8a8cd62281d6cbf058a85bb45a570d512198896d3d07635d6f8c90006Transfer63798542022-05-11 23:07:35573 days 18 hrs ago0x3fdbad53ab0068b9740aa2b9f7fddf3ef65e401c IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT10.9959
0x759188788065443e65b23c7f457eef99033b9c7d1bd08bade5b68a71dcf3317cApprove63187772022-05-10 12:08:01575 days 5 hrs ago0x967194c12408f16ca211f3651e2002d30bf93931 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
0xd8e878dfb08c7465de2875d82b79cc6099fdc77a5c86d1c682c05d6726a761a8Approve63156952022-05-10 10:22:05575 days 7 hrs ago0xd8e0db320748f8f3d6b77603cfb0c70a2fb6c8a7 IN  0xaa70a5b819b4ee01f7e521a6e465a9b84303543d0 BTT13.9305
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0xb9815d7e76a27d028708522e707d0e901dd668a279dac3a8c00e7b3f0d21730f40617092022-03-17 7:30:47629 days 10 hrs ago 0xd9bfe9979e9ca4b2fe84ba5d4cf963bbcb376974  Contract Creation0 BTT
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Similar Match Source Code
This contract matches the deployed ByteCode of the Source Code for Contract 0x9DE8E8c5658262cF2Dd79646Ac96B383D027Bb8C
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
DMMPool

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 999999 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at bttcscan.com on 2022-02-17
*/

// Sources flattened with hardhat v2.0.3 https://hardhat.org

// File @openzeppelin/contracts/math/[email protected]

// SPDX-License-Identifier: MIT


pragma solidity >=0.6.0 <0.8.0;

/**
 * @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;
    }
}


// File @openzeppelin/contracts/math/[email protected]



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}


// File @openzeppelin/contracts/utils/[email protected]



pragma solidity >=0.6.0 <0.8.0;

/**
 * @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 () internal {
        _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;
    }
}


// File @openzeppelin/contracts/token/ERC20/[email protected]



pragma solidity >=0.6.0 <0.8.0;

/**
 * @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);
}


// File @openzeppelin/contracts/utils/[email protected]



pragma solidity >=0.6.2 <0.8.0;

/**
 * @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);
            }
        }
    }
}


// File @openzeppelin/contracts/token/ERC20/[email protected]



pragma solidity >=0.6.0 <0.8.0;



/**
 * @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");
        }
    }
}


// File contracts/libraries/MathExt.sol


pragma solidity 0.6.12;

library MathExt {
    using SafeMath for uint256;

    uint256 public constant PRECISION = (10**18);

    /// @dev Returns x*y in precision
    function mulInPrecision(uint256 x, uint256 y) internal pure returns (uint256) {
        return x.mul(y) / PRECISION;
    }

    /// @dev source: dsMath
    /// @param xInPrecision should be < PRECISION, so this can not overflow
    /// @return zInPrecision = (x/PRECISION) ^k * PRECISION
    function unsafePowInPrecision(uint256 xInPrecision, uint256 k)
        internal
        pure
        returns (uint256 zInPrecision)
    {
        require(xInPrecision <= PRECISION, "MathExt: x > PRECISION");
        zInPrecision = k % 2 != 0 ? xInPrecision : PRECISION;

        for (k /= 2; k != 0; k /= 2) {
            xInPrecision = (xInPrecision * xInPrecision) / PRECISION;

            if (k % 2 != 0) {
                zInPrecision = (zInPrecision * xInPrecision) / PRECISION;
            }
        }
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}


// File contracts/libraries/FeeFomula.sol

pragma solidity 0.6.12;

library FeeFomula {
    using SafeMath for uint256;
    using MathExt for uint256;

    uint256 private constant PRECISION = 10**18;
    uint256 private constant R0 = 1477405064814996100; // 1.4774050648149961

    uint256 private constant C0 = (60 * PRECISION) / 10000;

    uint256 private constant A = uint256(PRECISION * 20000) / 27;
    uint256 private constant B = uint256(PRECISION * 250) / 9;
    uint256 private constant C1 = uint256(PRECISION * 985) / 27;
    uint256 private constant U = (120 * PRECISION) / 100;

    uint256 private constant G = (836 * PRECISION) / 1000;
    uint256 private constant F = 5 * PRECISION;
    uint256 private constant L = (2 * PRECISION) / 10000;
    // C2 = 25 * PRECISION - (F * (PRECISION - G)**2) / ((PRECISION - G)**2 + L * PRECISION)
    uint256 private constant C2 = 20036905816356657810;

    /// @dev calculate fee from rFactorInPrecision, see section 3.2 in dmmSwap white paper
    /// @dev fee in [15, 60] bps
    /// @return fee percentage in Precision
    function getFee(uint256 rFactorInPrecision) internal pure returns (uint256) {
        if (rFactorInPrecision >= R0) {
            return C0;
        } else if (rFactorInPrecision >= PRECISION) {
            // C1 + A * (r-U)^3 + b * (r -U)
            if (rFactorInPrecision > U) {
                uint256 tmp = rFactorInPrecision - U;
                uint256 tmp3 = tmp.unsafePowInPrecision(3);
                return (C1.add(A.mulInPrecision(tmp3)).add(B.mulInPrecision(tmp))) / 10000;
            } else {
                uint256 tmp = U - rFactorInPrecision;
                uint256 tmp3 = tmp.unsafePowInPrecision(3);
                return C1.sub(A.mulInPrecision(tmp3)).sub(B.mulInPrecision(tmp)) / 10000;
            }
        } else {
            // [ C2 + sign(r - G) *  F * (r-G) ^2 / (L + (r-G) ^2) ] / 10000
            uint256 tmp = (
                rFactorInPrecision > G ? (rFactorInPrecision - G) : (G - rFactorInPrecision)
            );
            tmp = tmp.unsafePowInPrecision(2);
            uint256 tmp2 = F.mul(tmp).div(tmp.add(L));
            if (rFactorInPrecision > G) {
                return C2.add(tmp2) / 10000;
            } else {
                return C2.sub(tmp2) / 10000;
            }
        }
    }
}


// File @openzeppelin/contracts/utils/[email protected]



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;
    }
}


// File @openzeppelin/contracts/token/ERC20/[email protected]



pragma solidity >=0.6.0 <0.8.0;



/**
 * @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_) public {
        _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 { }
}


// File contracts/interfaces/IERC20Permit.sol


pragma solidity 0.6.12;

interface IERC20Permit is IERC20 {
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}


// File contracts/libraries/ERC20Permit.sol


pragma solidity 0.6.12;

/// @dev https://eips.ethereum.org/EIPS/eip-2612
contract ERC20Permit is ERC20, IERC20Permit {
    /// @dev To make etherscan auto-verify new pool, this variable is not immutable
    bytes32 public domainSeparator;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32
        public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    mapping(address => uint256) public nonces;

    constructor(
        string memory name,
        string memory symbol,
        string memory version
    ) public ERC20(name, symbol) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        domainSeparator = keccak256(
            abi.encode(
                keccak256(
                    "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
                ),
                keccak256(bytes(name)),
                keccak256(bytes(version)),
                chainId,
                address(this)
            )
        );
    }

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external override {
        require(deadline >= block.timestamp, "ERC20Permit: EXPIRED");
        bytes32 digest = keccak256(
            abi.encodePacked(
                "\x19\x01",
                domainSeparator,
                keccak256(
                    abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline)
                )
            )
        );
        address recoveredAddress = ecrecover(digest, v, r, s);
        require(
            recoveredAddress != address(0) && recoveredAddress == owner,
            "ERC20Permit: INVALID_SIGNATURE"
        );
        _approve(owner, spender, value);
    }
}


// File contracts/interfaces/IDMMFactory.sol

pragma solidity 0.6.12;

interface IDMMFactory {
    function createPool(
        IERC20 tokenA,
        IERC20 tokenB,
        uint32 ampBps
    ) external returns (address pool);

    function setFeeConfiguration(address feeTo, uint16 governmentFeeBps) external;

    function setFeeToSetter(address) external;

    function getFeeConfiguration() external view returns (address feeTo, uint16 governmentFeeBps);

    function feeToSetter() external view returns (address);

    function allPools(uint256) external view returns (address pool);

    function allPoolsLength() external view returns (uint256);

    function getUnamplifiedPool(IERC20 token0, IERC20 token1) external view returns (address);

    function getPools(IERC20 token0, IERC20 token1)
        external
        view
        returns (address[] memory _tokenPools);

    function isPool(
        IERC20 token0,
        IERC20 token1,
        address pool
    ) external view returns (bool);
}


// File contracts/interfaces/IDMMCallee.sol

pragma solidity 0.6.12;

interface IDMMCallee {
    function dmmSwapCall(
        address sender,
        uint256 amount0,
        uint256 amount1,
        bytes calldata data
    ) external;
}


// File contracts/interfaces/IDMMPool.sol

pragma solidity 0.6.12;

interface IDMMPool {
    function mint(address to) external returns (uint256 liquidity);

    function burn(address to) external returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function sync() external;

    function getReserves() external view returns (uint112 reserve0, uint112 reserve1);

    function getTradeInfo()
        external
        view
        returns (
            uint112 _vReserve0,
            uint112 _vReserve1,
            uint112 reserve0,
            uint112 reserve1,
            uint256 feeInPrecision
        );

    function token0() external view returns (IERC20);

    function token1() external view returns (IERC20);

    function ampBps() external view returns (uint32);

    function factory() external view returns (IDMMFactory);

    function kLast() external view returns (uint256);
}


// File contracts/interfaces/IERC20Metadata.sol



pragma solidity 0.6.12;

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}


// File contracts/VolumeTrendRecorder.sol

pragma solidity 0.6.12;

/// @dev contract to calculate volume trend. See secion 3.1 in the white paper
/// @dev EMA stands for Exponential moving average
/// @dev https://en.wikipedia.org/wiki/Moving_average
contract VolumeTrendRecorder {
    using MathExt for uint256;
    using SafeMath for uint256;

    uint256 private constant MAX_UINT128 = 2**128 - 1;
    uint256 internal constant PRECISION = 10**18;
    uint256 private constant SHORT_ALPHA = (2 * PRECISION) / 5401;
    uint256 private constant LONG_ALPHA = (2 * PRECISION) / 10801;

    uint128 internal shortEMA;
    uint128 internal longEMA;
    // total volume in current block
    uint128 internal currentBlockVolume;
    uint128 internal lastTradeBlock;

    event UpdateEMA(uint256 shortEMA, uint256 longEMA, uint128 lastBlockVolume, uint256 skipBlock);

    constructor(uint128 _emaInit) public {
        shortEMA = _emaInit;
        longEMA = _emaInit;
        lastTradeBlock = safeUint128(block.number);
    }

    function getVolumeTrendData()
        external
        view
        returns (
            uint128 _shortEMA,
            uint128 _longEMA,
            uint128 _currentBlockVolume,
            uint128 _lastTradeBlock
        )
    {
        _shortEMA = shortEMA;
        _longEMA = longEMA;
        _currentBlockVolume = currentBlockVolume;
        _lastTradeBlock = lastTradeBlock;
    }

    /// @dev records a new trade, update ema and returns current rFactor for this trade
    /// @return rFactor in Precision for this trade
    function recordNewUpdatedVolume(uint256 blockNumber, uint256 value)
        internal
        returns (uint256)
    {
        // this can not be underflow because block.number always increases
        uint256 skipBlock = blockNumber - lastTradeBlock;
        if (skipBlock == 0) {
            currentBlockVolume = safeUint128(
                uint256(currentBlockVolume).add(value),
                "volume exceeds valid range"
            );
            return calculateRFactor(uint256(shortEMA), uint256(longEMA));
        }
        uint128 _currentBlockVolume = currentBlockVolume;
        uint256 _shortEMA = newEMA(shortEMA, SHORT_ALPHA, currentBlockVolume);
        uint256 _longEMA = newEMA(longEMA, LONG_ALPHA, currentBlockVolume);
        // ema = ema * (1-aplha) ^(skipBlock -1)
        _shortEMA = _shortEMA.mulInPrecision(
            (PRECISION - SHORT_ALPHA).unsafePowInPrecision(skipBlock - 1)
        );
        _longEMA = _longEMA.mulInPrecision(
            (PRECISION - LONG_ALPHA).unsafePowInPrecision(skipBlock - 1)
        );
        shortEMA = safeUint128(_shortEMA);
        longEMA = safeUint128(_longEMA);
        currentBlockVolume = safeUint128(value);
        lastTradeBlock = safeUint128(blockNumber);

        emit UpdateEMA(_shortEMA, _longEMA, _currentBlockVolume, skipBlock);

        return calculateRFactor(_shortEMA, _longEMA);
    }

    /// @return rFactor in Precision for this trade
    function getRFactor(uint256 blockNumber) internal view returns (uint256) {
        // this can not be underflow because block.number always increases
        uint256 skipBlock = blockNumber - lastTradeBlock;
        if (skipBlock == 0) {
            return calculateRFactor(shortEMA, longEMA);
        }
        uint256 _shortEMA = newEMA(shortEMA, SHORT_ALPHA, currentBlockVolume);
        uint256 _longEMA = newEMA(longEMA, LONG_ALPHA, currentBlockVolume);
        _shortEMA = _shortEMA.mulInPrecision(
            (PRECISION - SHORT_ALPHA).unsafePowInPrecision(skipBlock - 1)
        );
        _longEMA = _longEMA.mulInPrecision(
            (PRECISION - LONG_ALPHA).unsafePowInPrecision(skipBlock - 1)
        );
        return calculateRFactor(_shortEMA, _longEMA);
    }

    function calculateRFactor(uint256 _shortEMA, uint256 _longEMA)
        internal
        pure
        returns (uint256)
    {
        if (_longEMA == 0) {
            return 0;
        }
        return (_shortEMA * MathExt.PRECISION) / _longEMA;
    }

    /// @dev return newEMA value
    /// @param ema previous ema value in wei
    /// @param alpha in Precicion (required < Precision)
    /// @param value current value to update ema
    /// @dev ema and value is uint128 and alpha < Percison
    /// @dev so this function can not overflow and returned ema is not overflow uint128
    function newEMA(
        uint128 ema,
        uint256 alpha,
        uint128 value
    ) internal pure returns (uint256) {
        assert(alpha < PRECISION);
        return ((PRECISION - alpha) * uint256(ema) + alpha * uint256(value)) / PRECISION;
    }

    function safeUint128(uint256 v) internal pure returns (uint128) {
        require(v <= MAX_UINT128, "overflow uint128");
        return uint128(v);
    }

    function safeUint128(uint256 v, string memory errorMessage) internal pure returns (uint128) {
        require(v <= MAX_UINT128, errorMessage);
        return uint128(v);
    }
}


// File contracts/DMMPool.sol

pragma solidity 0.6.12;










contract DMMPool is IDMMPool, ERC20Permit, ReentrancyGuard, VolumeTrendRecorder {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    uint256 internal constant MAX_UINT112 = 2**112 - 1;
    uint256 internal constant BPS = 10000;

    struct ReserveData {
        uint256 reserve0;
        uint256 reserve1;
        uint256 vReserve0;
        uint256 vReserve1; // only used when isAmpPool = true
    }

    uint256 public constant MINIMUM_LIQUIDITY = 10**3;
    /// @dev To make etherscan auto-verify new pool, these variables are not immutable
    IDMMFactory public override factory;
    IERC20 public override token0;
    IERC20 public override token1;

    /// @dev uses single storage slot, accessible via getReservesData
    uint112 internal reserve0;
    uint112 internal reserve1;
    uint32 public override ampBps;
    /// @dev addition param only when amplification factor > 1
    uint112 internal vReserve0;
    uint112 internal vReserve1;

    /// @dev vReserve0 * vReserve1, as of immediately after the most recent liquidity event
    uint256 public override kLast;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to,
        uint256 feeInPrecision
    );
    event Sync(uint256 vReserve0, uint256 vReserve1, uint256 reserve0, uint256 reserve1);

    constructor() public ERC20Permit("KyberDMM LP", "DMM-LP", "1") VolumeTrendRecorder(0) {
        factory = IDMMFactory(msg.sender);
    }

    // called once by the factory at time of deployment
    function initialize(
        IERC20 _token0,
        IERC20 _token1,
        uint32 _ampBps
    ) external {
        require(msg.sender == address(factory), "DMM: FORBIDDEN");
        token0 = _token0;
        token1 = _token1;
        ampBps = _ampBps;
    }

    /// @dev this low-level function should be called from a contract
    ///                 which performs important safety checks
    function mint(address to) external override nonReentrant returns (uint256 liquidity) {
        (bool isAmpPool, ReserveData memory data) = getReservesData();
        ReserveData memory _data;
        _data.reserve0 = token0.balanceOf(address(this));
        _data.reserve1 = token1.balanceOf(address(this));
        uint256 amount0 = _data.reserve0.sub(data.reserve0);
        uint256 amount1 = _data.reserve1.sub(data.reserve1);

        bool feeOn = _mintFee(isAmpPool, data);
        uint256 _totalSupply = totalSupply(); // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            if (isAmpPool) {
                uint32 _ampBps = ampBps;
                _data.vReserve0 = _data.reserve0.mul(_ampBps) / BPS;
                _data.vReserve1 = _data.reserve1.mul(_ampBps) / BPS;
            }
            liquidity = MathExt.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
            _mint(address(-1), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min(
                amount0.mul(_totalSupply) / data.reserve0,
                amount1.mul(_totalSupply) / data.reserve1
            );
            if (isAmpPool) {
                uint256 b = liquidity.add(_totalSupply);
                _data.vReserve0 = Math.max(data.vReserve0.mul(b) / _totalSupply, _data.reserve0);
                _data.vReserve1 = Math.max(data.vReserve1.mul(b) / _totalSupply, _data.reserve1);
            }
        }
        require(liquidity > 0, "DMM: INSUFFICIENT_LIQUIDITY_MINTED");
        _mint(to, liquidity);

        _update(isAmpPool, _data);
        if (feeOn) kLast = getK(isAmpPool, _data);
        emit Mint(msg.sender, amount0, amount1);
    }

    /// @dev this low-level function should be called from a contract
    /// @dev which performs important safety checks
    /// @dev user must transfer LP token to this contract before call burn
    function burn(address to)
        external
        override
        nonReentrant
        returns (uint256 amount0, uint256 amount1)
    {
        (bool isAmpPool, ReserveData memory data) = getReservesData(); // gas savings
        IERC20 _token0 = token0; // gas savings
        IERC20 _token1 = token1; // gas savings

        uint256 balance0 = _token0.balanceOf(address(this));
        uint256 balance1 = _token1.balanceOf(address(this));
        require(balance0 >= data.reserve0 && balance1 >= data.reserve1, "DMM: UNSYNC_RESERVES");
        uint256 liquidity = balanceOf(address(this));

        bool feeOn = _mintFee(isAmpPool, data);
        uint256 _totalSupply = totalSupply(); // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, "DMM: INSUFFICIENT_LIQUIDITY_BURNED");
        _burn(address(this), liquidity);
        _token0.safeTransfer(to, amount0);
        _token1.safeTransfer(to, amount1);
        ReserveData memory _data;
        _data.reserve0 = _token0.balanceOf(address(this));
        _data.reserve1 = _token1.balanceOf(address(this));
        if (isAmpPool) {
            uint256 b = Math.min(
                _data.reserve0.mul(_totalSupply) / data.reserve0,
                _data.reserve1.mul(_totalSupply) / data.reserve1
            );
            _data.vReserve0 = Math.max(data.vReserve0.mul(b) / _totalSupply, _data.reserve0);
            _data.vReserve1 = Math.max(data.vReserve1.mul(b) / _totalSupply, _data.reserve1);
        }
        _update(isAmpPool, _data);
        if (feeOn) kLast = getK(isAmpPool, _data); // data are up-to-date
        emit Burn(msg.sender, amount0, amount1, to);
    }

    /// @dev this low-level function should be called from a contract
    /// @dev which performs important safety checks
    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata callbackData
    ) external override nonReentrant {
        require(amount0Out > 0 || amount1Out > 0, "DMM: INSUFFICIENT_OUTPUT_AMOUNT");
        (bool isAmpPool, ReserveData memory data) = getReservesData(); // gas savings
        require(
            amount0Out < data.reserve0 && amount1Out < data.reserve1,
            "DMM: INSUFFICIENT_LIQUIDITY"
        );

        ReserveData memory newData;
        {
            // scope for _token{0,1}, avoids stack too deep errors
            IERC20 _token0 = token0;
            IERC20 _token1 = token1;
            require(to != address(_token0) && to != address(_token1), "DMM: INVALID_TO");
            if (amount0Out > 0) _token0.safeTransfer(to, amount0Out); // optimistically transfer tokens
            if (amount1Out > 0) _token1.safeTransfer(to, amount1Out); // optimistically transfer tokens
            if (callbackData.length > 0)
                IDMMCallee(to).dmmSwapCall(msg.sender, amount0Out, amount1Out, callbackData);
            newData.reserve0 = _token0.balanceOf(address(this));
            newData.reserve1 = _token1.balanceOf(address(this));
            if (isAmpPool) {
                newData.vReserve0 = data.vReserve0.add(newData.reserve0).sub(data.reserve0);
                newData.vReserve1 = data.vReserve1.add(newData.reserve1).sub(data.reserve1);
            }
        }
        uint256 amount0In = newData.reserve0 > data.reserve0 - amount0Out
            ? newData.reserve0 - (data.reserve0 - amount0Out)
            : 0;
        uint256 amount1In = newData.reserve1 > data.reserve1 - amount1Out
            ? newData.reserve1 - (data.reserve1 - amount1Out)
            : 0;
        require(amount0In > 0 || amount1In > 0, "DMM: INSUFFICIENT_INPUT_AMOUNT");
        uint256 feeInPrecision = verifyBalanceAndUpdateEma(
            amount0In,
            amount1In,
            isAmpPool ? data.vReserve0 : data.reserve0,
            isAmpPool ? data.vReserve1 : data.reserve1,
            isAmpPool ? newData.vReserve0 : newData.reserve0,
            isAmpPool ? newData.vReserve1 : newData.reserve1
        );

        _update(isAmpPool, newData);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to, feeInPrecision);
    }

    /// @dev force balances to match reserves
    function skim(address to) external nonReentrant {
        token0.safeTransfer(to, token0.balanceOf(address(this)).sub(reserve0));
        token1.safeTransfer(to, token1.balanceOf(address(this)).sub(reserve1));
    }

    /// @dev force reserves to match balances
    function sync() external override nonReentrant {
        (bool isAmpPool, ReserveData memory data) = getReservesData();
        bool feeOn = _mintFee(isAmpPool, data);
        ReserveData memory newData;
        newData.reserve0 = IERC20(token0).balanceOf(address(this));
        newData.reserve1 = IERC20(token1).balanceOf(address(this));
        // update virtual reserves if this is amp pool
        if (isAmpPool) {
            uint256 _totalSupply = totalSupply();
            uint256 b = Math.min(
                newData.reserve0.mul(_totalSupply) / data.reserve0,
                newData.reserve1.mul(_totalSupply) / data.reserve1
            );
            newData.vReserve0 = Math.max(data.vReserve0.mul(b) / _totalSupply, newData.reserve0);
            newData.vReserve1 = Math.max(data.vReserve1.mul(b) / _totalSupply, newData.reserve1);
        }
        _update(isAmpPool, newData);
        if (feeOn) kLast = getK(isAmpPool, newData);
    }

    /// @dev returns data to calculate amountIn, amountOut
    function getTradeInfo()
        external
        virtual
        override
        view
        returns (
            uint112 _reserve0,
            uint112 _reserve1,
            uint112 _vReserve0,
            uint112 _vReserve1,
            uint256 feeInPrecision
        )
    {
        // gas saving to read reserve data
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        uint32 _ampBps = ampBps;
        _vReserve0 = vReserve0;
        _vReserve1 = vReserve1;
        if (_ampBps == BPS) {
            _vReserve0 = _reserve0;
            _vReserve1 = _reserve1;
        }
        uint256 rFactorInPrecision = getRFactor(block.number);
        feeInPrecision = getFinalFee(FeeFomula.getFee(rFactorInPrecision), _ampBps);
    }

    /// @dev returns reserve data to calculate amount to add liquidity
    function getReserves() external override view returns (uint112 _reserve0, uint112 _reserve1) {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
    }

    function name() public override view returns (string memory) {
        IERC20Metadata _token0 = IERC20Metadata(address(token0));
        IERC20Metadata _token1 = IERC20Metadata(address(token1));
        return string(abi.encodePacked("KyberDMM LP ", _token0.symbol(), "-", _token1.symbol()));
    }

    function symbol() public override view returns (string memory) {
        IERC20Metadata _token0 = IERC20Metadata(address(token0));
        IERC20Metadata _token1 = IERC20Metadata(address(token1));
        return string(abi.encodePacked("DMM-LP ", _token0.symbol(), "-", _token1.symbol()));
    }

    function verifyBalanceAndUpdateEma(
        uint256 amount0In,
        uint256 amount1In,
        uint256 beforeReserve0,
        uint256 beforeReserve1,
        uint256 afterReserve0,
        uint256 afterReserve1
    ) internal virtual returns (uint256 feeInPrecision) {
        // volume = beforeReserve0 * amount1In / beforeReserve1 + amount0In (normalized into amount in token 0)
        uint256 volume = beforeReserve0.mul(amount1In).div(beforeReserve1).add(amount0In);
        uint256 rFactorInPrecision = recordNewUpdatedVolume(block.number, volume);
        feeInPrecision = getFinalFee(FeeFomula.getFee(rFactorInPrecision), ampBps);
        // verify balance update matches with fomula
        uint256 balance0Adjusted = afterReserve0.mul(PRECISION);
        balance0Adjusted = balance0Adjusted.sub(amount0In.mul(feeInPrecision));
        balance0Adjusted = balance0Adjusted / PRECISION;
        uint256 balance1Adjusted = afterReserve1.mul(PRECISION);
        balance1Adjusted = balance1Adjusted.sub(amount1In.mul(feeInPrecision));
        balance1Adjusted = balance1Adjusted / PRECISION;
        require(
            balance0Adjusted.mul(balance1Adjusted) >= beforeReserve0.mul(beforeReserve1),
            "DMM: K"
        );
    }

    /// @dev update reserves
    function _update(bool isAmpPool, ReserveData memory data) internal {
        reserve0 = safeUint112(data.reserve0);
        reserve1 = safeUint112(data.reserve1);
        if (isAmpPool) {
            assert(data.vReserve0 >= data.reserve0 && data.vReserve1 >= data.reserve1); // never happen
            vReserve0 = safeUint112(data.vReserve0);
            vReserve1 = safeUint112(data.vReserve1);
        }
        emit Sync(data.vReserve0, data.vReserve1, data.reserve0, data.reserve1);
    }

    /// @dev if fee is on, mint liquidity equivalent to configured fee of the growth in sqrt(k)
    function _mintFee(bool isAmpPool, ReserveData memory data) internal returns (bool feeOn) {
        (address feeTo, uint16 governmentFeeBps) = factory.getFeeConfiguration();
        feeOn = feeTo != address(0);
        uint256 _kLast = kLast; // gas savings
        if (feeOn) {
            if (_kLast != 0) {
                uint256 rootK = MathExt.sqrt(getK(isAmpPool, data));
                uint256 rootKLast = MathExt.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint256 numerator = totalSupply().mul(rootK.sub(rootKLast)).mul(
                        governmentFeeBps
                    );
                    uint256 denominator = rootK.add(rootKLast).mul(5000);
                    uint256 liquidity = numerator / denominator;
                    if (liquidity > 0) _mint(feeTo, liquidity);
                }
            }
        } else if (_kLast != 0) {
            kLast = 0;
        }
    }

    /// @dev gas saving to read reserve data
    function getReservesData() internal view returns (bool isAmpPool, ReserveData memory data) {
        data.reserve0 = reserve0;
        data.reserve1 = reserve1;
        isAmpPool = ampBps != BPS;
        if (isAmpPool) {
            data.vReserve0 = vReserve0;
            data.vReserve1 = vReserve1;
        }
    }

    function getFinalFee(uint256 feeInPrecision, uint32 _ampBps) internal pure returns (uint256) {
        if (_ampBps <= 20000) {
            return feeInPrecision;
        } else if (_ampBps <= 50000) {
            return (feeInPrecision * 20) / 30;
        } else if (_ampBps <= 200000) {
            return (feeInPrecision * 10) / 30;
        } else {
            return (feeInPrecision * 4) / 30;
        }
    }

    function getK(bool isAmpPool, ReserveData memory data) internal pure returns (uint256) {
        return isAmpPool ? data.vReserve0 * data.vReserve1 : data.reserve0 * data.reserve1;
    }

    function safeUint112(uint256 x) internal pure returns (uint112) {
        require(x <= MAX_UINT112, "DMM: OVERFLOW");
        return uint112(x);
    }
}

Contract ABI

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IERC20","name":"_token0","type":"address"},{"internalType":"contract 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IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token1","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://49f6f8528b3e4b37e72b9bde0aa804ce74fda17a3dc51ea424bf85cf5943707e
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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