Contract 0x0EF812f4c68DC84c22A4821EF30ba2ffAB9C2f3A 2

Txn Hash Method
Block
From
To
Value [Txn Fee]
0x1bc46e04d7b8ede42b4e9ca8e17989ff960552a1a500fa4c12f6101b90359ccfSwap And Redeem ...170164772022-07-07 13:05:244 mins ago0x5e7b5b815da7a903855cf96687899af3f0ddf449 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007206463 26.5
0x74fb8c40652651900350cf7b0c7de88aa0bc1a8c58d9fb09fc3566e1d85b8dbeSwap And Redeem ...170159722022-07-07 12:48:3421 mins ago0xbdcf5d983a204c4b597fb519402ba5495472e60b IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007208053 26.5
0x80f26fe2c0f18463266a7790e009734d659f8c4deab40f63911d359ea8fe7581Swap And Redeem ...170159682022-07-07 12:48:2521 mins ago0x535fc03b07984c1adb2e21015d16f58ea1e6ed3d IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007340166 27
0xd126df2d819d3cfcad0c1a7bce57e3dffac9237ecff326403fffc410d25ac904Swap And Redeem ...170158742022-07-07 12:45:1724 mins ago0x13376824dea4ea56beb99fd0f46b6e24c46f12da IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.076988529 123
0x659abf478b834d9f96acbb044c17463c5e6bf9abc3565b6504639f81ad17a01cSwap And Redeem ...170156432022-07-07 12:37:3432 mins ago0xa49ba438191fe703a97d59b2f74311dadd00692c IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.00747477527.5
0xa8a6c8f4e9fca2d1fc1eb26211f42b7d918a8b28f0ed4a5a9af426c76b52db84Swap And Redeem ...170153492022-07-07 12:27:3842 mins ago0xa21169327f599936c1a198bf5d2e7cc89944cd88 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007203283 26.5
0x992c070fe1e4c83082bea273ba0cdfbe561a61c9a31c59f9482cb8f4f10a4e75Swap And Redeem170149902022-07-07 12:15:3354 mins ago0xf14ce0dd84e1beaa11feb30ddf8ceaf72d02c3e0 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.016521213 26.5
0xfb94f9798dbd8808fdde626802af33e92d0e532ea15543c1c116ab112215de60Redeem170147722022-07-07 12:08:181 hr 1 min ago0xd54e4f8a55247487dd7c8c59f14ee5c0c2889477 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.002862675 27
0x38840a3e27cac50372d5a5e0744ce0ab9cad05854cbdb2ac5bc7976463930f83Swap And Redeem ...170144702022-07-07 11:58:141 hr 11 mins ago0x35a46e0e610dea4548d7d6c176671a75f0cd2713 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.0073388727
0xdff3538c9d9f98d5282999997090544645cd56a5905b8f45e29913ac623dde0aSwap And Redeem ...170140032022-07-07 11:42:381 hr 27 mins ago0x22d7453a7564615217faf75736b9ab6361eeac97 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007203283 26.5
0x7a82fb0957eb0192b7d0f0691f1e3a8363105745ed94b59fde26d2e91695a56eSwap And Redeem ...170138562022-07-07 11:37:441 hr 32 mins ago0xff4f7b726ee86f810531d2842b3bdd8a512db594 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007202329 26.5
0x41b8021a6578eacffd665592849bba9305dd97bff2168d7f8dde393c6a417da8Swap And Redeem170134792022-07-07 11:24:571 hr 45 mins ago0x303c3d4393293e10db2b153a9c7ef8fc5aaf226f IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.016520259 26.5
0xd6692ab7c5e50c6e3f8c138de7c65273bb2cd0db5ee161408c2772152fdc5d71Swap And Redeem ...170130542022-07-07 11:10:481 hr 59 mins ago0x9467135a90023c731803289676302fa18e75f5fe IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007203283 26.5
0xc6595569f05c3891859b56be57d205c919c80e18f14ca3342a10d7258f456469Swap And Redeem ...170119752022-07-07 10:34:382 hrs 35 mins ago0x8726e883ea7938cb8551c1c45f0e9210411d2d0d IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007094867426.1
0x5b7f7e1cf9d2ef7bf9bf9476b25cd46e2cfaf1e930b7192330fda7ddc3a3bf35Swap And Redeem ...170115492022-07-07 10:20:222 hrs 49 mins ago0x710d40acbbfa2c985dfce4585e0bd4a764e2e711 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007204237 26.5
0xa60197e1d8ca40ea2b6dd9c01a5e3bca21f344d750fa7f3a314151425d700d52Swap And Redeem ...170111632022-07-07 10:07:193 hrs 2 mins ago0x7082911b550a67914c1296ceed0f46bd65d8fd2e IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007204873 26.5
0x291059fe21d6c11fd057b71282600004a1806d2640b23b5cc71e08804c99184dSwap And Redeem170103202022-07-07 9:38:543 hrs 31 mins ago0x5281e5383f06fad65e20e342b7b89b1fd9932078 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.016521531 26.5
0xbc57de6c9482c9cecdf73621da6d969a8e02679e6dcfc02d34f9b12923c4918dSwap And Redeem ...170098692022-07-07 9:23:433 hrs 46 mins ago0x73523c8571846b8f0393723cac60e128205437b9 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007202647 26.5
0xb07307d1ee79f79e7bf617b03ed42c50b9331bee42faad22df1bda2dd2b02b9aSwap And Redeem170091202022-07-07 8:58:384 hrs 11 mins ago0xe0f1772ccf1012bdfa09d31a2c5538adfb401ca0 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007138517 26.5
0x9b88318ad1d996026d92eff8623f6efa813e0fd34f3c2faba8fd7ca794b81140Swap And Redeem ...170089222022-07-07 8:52:024 hrs 17 mins ago0x661fbe2938814e30f2dac0a6b465e1080068e88e IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007204555 26.5
0x6718b38478f4b28ab1b988d3b12cd6284a4b71636ad96040c45482aabc8d305aSwap And Redeem ...170085322022-07-07 8:38:594 hrs 31 mins ago0xeb8a58a41cd7217db5f919c3f0a2c2a864de9979 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007204873 26.5
0xff8ccbf408cefa753fdb2a7875f4823d8329dcc14710d81ebb62dd4b01a63495Swap And Redeem ...170079252022-07-07 8:18:344 hrs 51 mins ago0x5e66683b046d41a6c1cbbf7ca9a8b19b5ea4fec1 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007204237 26.5
0x0124d8205237bc1eb874e24425b4ba314bd2f60d6717c9aa62c58d4a00bbb3d3Swap And Redeem170079242022-07-07 8:18:324 hrs 51 mins ago0xfab9283dde2424cb6211d0f467af657bdb931f57 IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.016521531 26.5
0xcc8e3e9dc59ff4a58235e53beb0b2f5e14a3c2249a20a542daa90171438e2561Swap And Redeem ...170078392022-07-07 8:15:394 hrs 54 mins ago0x10d972b795ed7085beab58ebff06d501ce69d0cc IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007204873 26.5
0x82e7ed3862ea1157ea7eb0bc846c2fc5e200ff1df64ff54cfa79ccce14f0813bSwap And Redeem ...170076192022-07-07 8:08:195 hrs 1 min ago0x5d6836f641fffe6a86799b51a4bded07148760ca IN  0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a0 AVAX0.007203283 26.5
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x92d3075eaffc9690e0c8e4d9089c2f4d61a65fb61ecf2adf947752961f57d546169980092022-07-07 2:46:2710 hrs 23 mins ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX7.28507847925 AVAX
0x0aaf945bd12184a6c7649f9dcf3783cdccf2ef7521974716ca9a84714aaf7583169978962022-07-07 2:42:4010 hrs 27 mins ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX8.49 AVAX
0xde93ecf6c7f279db7f736557c903897331818cc5b28f8569a49e8a0a55237c92169934022022-07-07 0:12:2112 hrs 57 mins ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX5 AVAX
0xa1c51540a5d28e28e85965d184f3a7be4ab6ffc16dc52ec9f6aabebc3779f329169932982022-07-07 0:08:5713 hrs 1 min ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX5.2 AVAX
0x491444125bee0744634fe5475f863ec717eb5d1db4420cc85228eaa07ac05b80169902632022-07-06 22:27:3514 hrs 42 mins ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX0.45 AVAX
0xf59f9da12a210bcc8d3be738490664a2a916db1497b28e3aa9187cdfa15884b4169880852022-07-06 21:15:2915 hrs 54 mins ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX0.1 AVAX
0x86ad4f25ca8c8c93000f6a954f5674d063fc801d7cbaedb172b0e547d4d07499169842732022-07-06 19:08:0418 hrs 1 min ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX1.401324753712659675 AVAX
0x9ef5d151dfb7b52d450a321078d3293c5beaced44f4b86d2f3e1ecaf954d73f5169823432022-07-06 18:04:0419 hrs 5 mins ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX205 AVAX
0x71d3482a57211f8275a45b3241ed57752ca57c384971808f978bdd83a9ed81fd169505412022-07-06 0:18:561 day 12 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX6.31 AVAX
0xe9120cfba964f5ef388e5aeffa3fa34dc6901d23c6259d7c8e0f8866352f7505169435572022-07-05 20:25:571 day 16 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX0.63 AVAX
0x4c8703a35cbacc576a5812fae9fcff63be2bf5ce74176db19adf3025a5844094169416022022-07-05 19:20:461 day 17 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX5.21 AVAX
0x78e80b00167bc4b91ee1e93c424aaebf86877a95c9baf4686dbdfb138dcb65c8169376932022-07-05 17:10:121 day 19 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX1.86313 AVAX
0x5e2669cea14971c789a375b0cba951370b109ef7379a09fb71e3a4d6677d46d3169366522022-07-05 16:35:211 day 20 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX1 AVAX
0xc590e2ed76c9e6bb30fc2b1444237e172c12599d3b2a855e1d687202d74049c3169343752022-07-05 15:18:261 day 21 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX10 AVAX
0x336f2ded49487f01984aa25b87fb23d1bb43cb0e7bb44404c5d3b8f2efa42d90169312402022-07-05 13:33:371 day 23 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX2.170842165 AVAX
0x66bf5241e0f29b2b82cf7dde911af7e8025a1500ed51c858b452a16ea4be5654169281832022-07-05 11:51:182 days 1 hr ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX53.404865784481085335 AVAX
0xe773838e1b3915924b3beee0a4ad381324fe14295c0da3c26015b95e62901c4c169168152022-07-05 5:28:052 days 7 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX4.25 AVAX
0x02f722160e07af4565baee1a8a48f29463867d30aadb326405c4f92db9724109169025832022-07-04 21:29:492 days 15 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX125.24 AVAX
0x1c82e72e58c16f8e411fc267c1f657a1d8498f2583d05ebd071970b0d3316f9d169020472022-07-04 21:11:482 days 15 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX120.48 AVAX
0xbfe8c7a18c23d3fb4dcf4718cee96c0ef481e74847009fe928515e7ba345b482169018792022-07-04 21:06:092 days 16 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX44.98 AVAX
0x558486ae1e6560fe93c54fc3605cb025e9e24c17c15f56e18cc6b18bc4251600169014572022-07-04 20:51:492 days 16 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX114.57 AVAX
0xd35fa6fdee79d04b32679a236d1dc6366a27300b78f23ad0737602d498b6d84e168973302022-07-04 18:33:232 days 18 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX81.23 AVAX
0x993e02d5a03049c158e40888dd809de770fbef187759c02766593c3d2dcc3257168850342022-07-04 11:42:483 days 1 hr ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX3 AVAX
0x7664f2b0053e414cab5c670595e900593ba6aa113f83fb15c84f0e3553994287168849192022-07-04 11:38:543 days 1 hr ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX1 AVAX
0xce309c4fcd0f97413b557711a3dc826cbb22ab5dd1248e21b0f69fd709ba2050168741832022-07-04 5:36:563 days 7 hrs ago 0x0ef812f4c68dc84c22a4821ef30ba2ffab9c2f3a Wrapped AVAX0.747302970787526899 AVAX
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Contract Source Code Verified (Exact Match)

Contract Name:
L2BridgeZap

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 10000 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 11 : SafeMath.sol
// 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 2 of 11 : ERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) 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 3 of 11 : ERC20Burnable.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/Context.sol";
import "./ERC20.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    using SafeMath for uint256;

    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}

File 4 of 11 : IERC20.sol
// SPDX-License-Identifier: MIT

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 5 of 11 : SafeERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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

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

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

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

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

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

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

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

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

File 6 of 11 : Address.sol
// SPDX-License-Identifier: MIT

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 7 of 11 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

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

File 8 of 11 : ISwap.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import '@openzeppelin/contracts/token/ERC20/ERC20.sol';

interface ISwap {
  // pool data view functions
  function getA() external view returns (uint256);

  function getToken(uint8 index) external view returns (IERC20);

  function getTokenIndex(address tokenAddress) external view returns (uint8);

  function getTokenBalance(uint8 index) external view returns (uint256);

  function getVirtualPrice() external view returns (uint256);

  // min return calculation functions
  function calculateSwap(
    uint8 tokenIndexFrom,
    uint8 tokenIndexTo,
    uint256 dx
  ) external view returns (uint256);

  function calculateTokenAmount(uint256[] calldata amounts, bool deposit)
    external
    view
    returns (uint256);

  function calculateRemoveLiquidity(uint256 amount)
    external
    view
    returns (uint256[] memory);

  function calculateRemoveLiquidityOneToken(
    uint256 tokenAmount,
    uint8 tokenIndex
  ) external view returns (uint256 availableTokenAmount);

  // state modifying functions
  function initialize(
    IERC20[] memory pooledTokens,
    uint8[] memory decimals,
    string memory lpTokenName,
    string memory lpTokenSymbol,
    uint256 a,
    uint256 fee,
    uint256 adminFee,
    address lpTokenTargetAddress
  ) external;

  function swap(
    uint8 tokenIndexFrom,
    uint8 tokenIndexTo,
    uint256 dx,
    uint256 minDy,
    uint256 deadline
  ) external returns (uint256);

  function addLiquidity(
    uint256[] calldata amounts,
    uint256 minToMint,
    uint256 deadline
  ) external returns (uint256);

  function removeLiquidity(
    uint256 amount,
    uint256[] calldata minAmounts,
    uint256 deadline
  ) external returns (uint256[] memory);

  function removeLiquidityOneToken(
    uint256 tokenAmount,
    uint8 tokenIndex,
    uint256 minAmount,
    uint256 deadline
  ) external returns (uint256);

  function removeLiquidityImbalance(
    uint256[] calldata amounts,
    uint256 maxBurnAmount,
    uint256 deadline
  ) external returns (uint256);
}

File 9 of 11 : ISynapseBridge.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import '@openzeppelin/contracts/token/ERC20/SafeERC20.sol';
import '@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol';

interface ISynapseBridge {
  using SafeERC20 for IERC20;

  function deposit(
    address to,
    uint256 chainId,
    IERC20 token,
    uint256 amount
  ) external;

  function depositAndSwap(
    address to,
    uint256 chainId,
    IERC20 token,
    uint256 amount,
    uint8 tokenIndexFrom,
    uint8 tokenIndexTo,
    uint256 minDy,
    uint256 deadline
  ) external;

  function redeem(
    address to,
    uint256 chainId,
    IERC20 token,
    uint256 amount
  ) external;


  function redeemv2(
    bytes32 to,
    uint256 chainId,
    IERC20 token,
    uint256 amount
  ) external;


  function redeemAndSwap(
    address to,
    uint256 chainId,
    IERC20 token,
    uint256 amount,
    uint8 tokenIndexFrom,
    uint8 tokenIndexTo,
    uint256 minDy,
    uint256 deadline
  ) external;

  function redeemAndRemove(
    address to,
    uint256 chainId,
    IERC20 token,
    uint256 amount,
    uint8 liqTokenIndex,
    uint256 liqMinAmount,
    uint256 liqDeadline
  ) external;
}

File 10 of 11 : IWETH9.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.4.0;

interface IWETH9 {
    function name() external view returns (string memory);

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

    function decimals() external view returns (uint8);

    function balanceOf(address) external view returns (uint256);

    function allowance(address, address) external view returns (uint256);

    receive() external payable;

    function deposit() external payable;

    function withdraw(uint256 wad) external;

    function totalSupply() external view returns (uint256);

    function approve(address guy, uint256 wad) external returns (bool);

    function transfer(address dst, uint256 wad) external returns (bool);

    function transferFrom(
        address src,
        address dst,
        uint256 wad
    ) external returns (bool);
}

File 11 of 11 : L2BridgeZap.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "../interfaces/ISwap.sol";
import "../interfaces/ISynapseBridge.sol";
import "../interfaces/IWETH9.sol";

contract L2BridgeZap {
    using SafeERC20 for IERC20;

    ISynapseBridge synapseBridge;
    address payable public immutable WETH_ADDRESS;

    mapping(address => address) public swapMap;
    mapping(address => IERC20[]) public swapTokensMap;

    uint256 constant MAX_UINT256 = 2**256 - 1;

    constructor(
        address payable _wethAddress,
        address _swapOne,
        address tokenOne,
        address _swapTwo,
        address tokenTwo,
        ISynapseBridge _synapseBridge
    ) public {
        WETH_ADDRESS = _wethAddress;
        synapseBridge = _synapseBridge;
        swapMap[tokenOne] = _swapOne;
        swapMap[tokenTwo] = _swapTwo;
        if (_wethAddress != address(0)) {
            IERC20(_wethAddress).safeIncreaseAllowance(address(_synapseBridge), MAX_UINT256);
        }
        if (address(_swapOne) != address(0)) {
            {
                uint8 i;
                for (; i < 32; i++) {
                    try ISwap(_swapOne).getToken(i) returns (
                        IERC20 token
                    ) {
                        swapTokensMap[_swapOne].push(token);
                        token.safeApprove(address(_swapOne), MAX_UINT256);
                        token.safeApprove(address(synapseBridge), MAX_UINT256);
                    } catch {
                        break;
                    }
                }
                require(i > 1, "swap must have at least 2 tokens");
            }
        }
        if (address(_swapTwo) != address(0)) {
            {
                uint8 i;
                for (; i < 32; i++) {
                    try ISwap(_swapTwo).getToken(i) returns (
                        IERC20 token
                    ) {
                        swapTokensMap[_swapTwo].push(token);
                        token.safeApprove(address(_swapTwo), MAX_UINT256);
                        token.safeApprove(address(synapseBridge), MAX_UINT256);
                    } catch {
                        break;
                    }
                }
                require(i > 1, "swap must have at least 2 tokens");
            }
        }
    }

    /**
     * @notice Calculate amount of tokens you receive on swap
     * @param tokenIndexFrom the token the user wants to sell
     * @param tokenIndexTo the token the user wants to buy
     * @param dx the amount of tokens the user wants to sell. If the token charges
     * a fee on transfers, use the amount that gets transferred after the fee.
     * @return amount of tokens the user will receive
     */
    function calculateSwap(
        IERC20 token,
        uint8 tokenIndexFrom,
        uint8 tokenIndexTo,
        uint256 dx
    ) external view virtual returns (uint256) {
        ISwap swap = ISwap(
            swapMap[address(token)]
        );
        return swap.calculateSwap(tokenIndexFrom, tokenIndexTo, dx);
    }

    function swapAndRedeem(
        address to,
        uint256 chainId,
        IERC20 token,
        uint8 tokenIndexFrom,
        uint8 tokenIndexTo,
        uint256 dx,
        uint256 minDy,
        uint256 deadline
    ) external {
        ISwap swap = ISwap(swapMap[address(token)]);
        require(address(swap) != address(0), "Swap is 0x00");
        IERC20[] memory tokens = swapTokensMap[address(swap)];
        tokens[tokenIndexFrom].safeTransferFrom(
            msg.sender,
            address(this),
            dx
        );
        // swap

        uint256 swappedAmount = swap.swap(
            tokenIndexFrom,
            tokenIndexTo,
            dx,
            minDy,
            deadline
        );
        // deposit into bridge, gets nUSD
        if (
            token.allowance(address(this), address(synapseBridge)) <
            swappedAmount
        ) {
            token.safeApprove(address(synapseBridge), MAX_UINT256);
        }
        synapseBridge.redeem(to, chainId, token, swappedAmount);
    }

    function swapAndRedeemAndSwap(
        address to,
        uint256 chainId,
        IERC20 token,
        uint8 tokenIndexFrom,
        uint8 tokenIndexTo,
        uint256 dx,
        uint256 minDy,
        uint256 deadline,
        uint8 swapTokenIndexFrom,
        uint8 swapTokenIndexTo,
        uint256 swapMinDy,
        uint256 swapDeadline
    ) external {
        require(
            address(swapMap[address(token)]) != address(0),
            "Swap is 0x00"
        );
        IERC20[] memory tokens = swapTokensMap[
            swapMap[address(token)]
        ];
        tokens[tokenIndexFrom].safeTransferFrom(
            msg.sender,
            address(this),
            dx
        );
        // swap

        uint256 swappedAmount = ISwap(swapMap[address(token)]).swap(tokenIndexFrom, tokenIndexTo, dx, minDy, deadline);
        // deposit into bridge, gets nUSD
        if (
            token.allowance(address(this), address(synapseBridge)) <
            swappedAmount
        ) {
            token.safeApprove(address(synapseBridge), MAX_UINT256);
        }
        synapseBridge.redeemAndSwap(
            to,
            chainId,
            token,
            swappedAmount,
            swapTokenIndexFrom,
            swapTokenIndexTo,
            swapMinDy,
            swapDeadline
        );
    }

    function swapAndRedeemAndRemove(
        address to,
        uint256 chainId,
        IERC20 token,
        uint8 tokenIndexFrom,
        uint8 tokenIndexTo,
        uint256 dx,
        uint256 minDy,
        uint256 deadline,
        uint8 liqTokenIndex,
        uint256 liqMinAmount,
        uint256 liqDeadline
    ) external {
        ISwap swap = ISwap(swapMap[address(token)]);
        require(address(swap) != address(0), "Swap is 0x00");
        IERC20[] memory tokens = swapTokensMap[address(swap)];
        tokens[tokenIndexFrom].safeTransferFrom(
            msg.sender,
            address(this),
            dx
        );
        // swap

        uint256 swappedAmount = swap.swap(
            tokenIndexFrom,
            tokenIndexTo,
            dx,
            minDy,
            deadline
        );
        // deposit into bridge, gets nUSD
        if (
            token.allowance(address(this), address(synapseBridge)) <
            swappedAmount
        ) {
            token.safeApprove(address(synapseBridge), MAX_UINT256);
        }
        synapseBridge.redeemAndRemove(
            to,
            chainId,
            token,
            swappedAmount,
            liqTokenIndex,
            liqMinAmount,
            liqDeadline
        );
    }

    /**
     * @notice wraps SynapseBridge redeem()
     * @param to address on other chain to redeem underlying assets to
     * @param chainId which underlying chain to bridge assets onto
     * @param token ERC20 compatible token to deposit into the bridge
     * @param amount Amount in native token decimals to transfer cross-chain pre-fees
     **/
    function redeem(
        address to,
        uint256 chainId,
        IERC20 token,
        uint256 amount
    ) external {
        token.safeTransferFrom(msg.sender, address(this), amount);
        if (token.allowance(address(this), address(synapseBridge)) < amount) {
            token.safeApprove(address(synapseBridge), MAX_UINT256);
        }
        synapseBridge.redeem(to, chainId, token, amount);
    }

    /**
     * @notice wraps SynapseBridge redeem()
     * @param to address on other chain to redeem underlying assets to
     * @param chainId which underlying chain to bridge assets onto
     * @param token ERC20 compatible token to deposit into the bridge
     * @param amount Amount in native token decimals to transfer cross-chain pre-fees
     **/
    function deposit(
        address to,
        uint256 chainId,
        IERC20 token,
        uint256 amount
    ) external {
        token.safeTransferFrom(msg.sender, address(this), amount);
        if (token.allowance(address(this), address(synapseBridge)) < amount) {
            token.safeApprove(address(synapseBridge), MAX_UINT256);
        }
        synapseBridge.deposit(to, chainId, token, amount);
    }

    /**
   * @notice Wraps SynapseBridge deposit() function to make it compatible w/ ETH -> WETH conversions
   * @param to address on other chain to bridge assets to
   * @param chainId which chain to bridge assets onto
   * @param amount Amount in native token decimals to transfer cross-chain pre-fees
   **/
  function depositETH(
    address to,
    uint256 chainId,
    uint256 amount
    ) external payable {
      require(msg.value > 0 && msg.value == amount, 'INCORRECT MSG VALUE');
      IWETH9(WETH_ADDRESS).deposit{value: msg.value}();
      synapseBridge.deposit(to, chainId, IERC20(WETH_ADDRESS), amount);
    }


  /**
   * @notice Wraps SynapseBridge depositAndSwap() function to make it compatible w/ ETH -> WETH conversions
   * @param to address on other chain to bridge assets to
   * @param chainId which chain to bridge assets onto
   * @param amount Amount in native token decimals to transfer cross-chain pre-fees
   * @param tokenIndexFrom the token the user wants to swap from
   * @param tokenIndexTo the token the user wants to swap to
   * @param minDy the min amount the user would like to receive, or revert to only minting the SynERC20 token crosschain.
   * @param deadline latest timestamp to accept this transaction
   **/
  function depositETHAndSwap(
    address to,
    uint256 chainId,
    uint256 amount,
    uint8 tokenIndexFrom,
    uint8 tokenIndexTo,
    uint256 minDy,
    uint256 deadline
    ) external payable {
      require(msg.value > 0 && msg.value == amount, 'INCORRECT MSG VALUE');
      IWETH9(WETH_ADDRESS).deposit{value: msg.value}();
      synapseBridge.depositAndSwap(to, chainId, IERC20(WETH_ADDRESS), amount, tokenIndexFrom, tokenIndexTo, minDy, deadline);
    }


    function swapETHAndRedeem(
        address to,
        uint256 chainId,
        IERC20 token,
        uint8 tokenIndexFrom,
        uint8 tokenIndexTo,
        uint256 dx,
        uint256 minDy,
        uint256 deadline
    ) external payable {
        require(WETH_ADDRESS != address(0), "WETH 0");
        require(msg.value > 0 && msg.value == dx, "INCORRECT MSG VALUE");
        ISwap swap = ISwap(swapMap[address(token)]);
        require(address(swap) != address(0), "Swap is 0x00");
        IWETH9(WETH_ADDRESS).deposit{value: msg.value}();

        // swap
        uint256 swappedAmount = swap.swap(
            tokenIndexFrom,
            tokenIndexTo,
            dx,
            minDy,
            deadline
        );
        synapseBridge.redeem(to, chainId, token, swappedAmount);
    }


    function swapETHAndRedeemAndSwap(
        address to,
        uint256 chainId,
        IERC20 token,
        uint8 tokenIndexFrom,
        uint8 tokenIndexTo,
        uint256 dx,
        uint256 minDy,
        uint256 deadline,
        uint8 swapTokenIndexFrom,
        uint8 swapTokenIndexTo,
        uint256 swapMinDy,
        uint256 swapDeadline
    ) external payable {
        require(WETH_ADDRESS != address(0), "WETH 0");
        require(msg.value > 0 && msg.value == dx, "INCORRECT MSG VALUE");
        ISwap swap = ISwap(swapMap[address(token)]);
        require(address(swap) != address(0), "Swap is 0x00");
        IWETH9(WETH_ADDRESS).deposit{value: msg.value}();

        // swap
        uint256 swappedAmount = swap.swap(
            tokenIndexFrom,
            tokenIndexTo,
            dx,
            minDy,
            deadline
        );
        synapseBridge.redeemAndSwap(to, chainId, token, swappedAmount,swapTokenIndexFrom,
            swapTokenIndexTo,
            swapMinDy,
            swapDeadline);
    }


    /**
     * @notice Wraps redeemAndSwap on SynapseBridge.sol
     * Relays to nodes that (typically) a wrapped synAsset ERC20 token has been burned and the underlying needs to be redeeemed on the native chain. This function indicates to the nodes that they should attempt to redeem the LP token for the underlying assets (E.g "swap" out of the LP token)
     * @param to address on other chain to redeem underlying assets to
     * @param chainId which underlying chain to bridge assets onto
     * @param token ERC20 compatible token to deposit into the bridge
     * @param amount Amount in native token decimals to transfer cross-chain pre-fees
     * @param tokenIndexFrom the token the user wants to swap from
     * @param tokenIndexTo the token the user wants to swap to
     * @param minDy the min amount the user would like to receive, or revert to only minting the SynERC20 token crosschain.
     * @param deadline latest timestamp to accept this transaction
     **/
    function redeemAndSwap(
        address to,
        uint256 chainId,
        IERC20 token,
        uint256 amount,
        uint8 tokenIndexFrom,
        uint8 tokenIndexTo,
        uint256 minDy,
        uint256 deadline
    ) external {
        token.safeTransferFrom(msg.sender, address(this), amount);
        if (token.allowance(address(this), address(synapseBridge)) < amount) {
            token.safeApprove(address(synapseBridge), MAX_UINT256);
        }
        synapseBridge.redeemAndSwap(
            to,
            chainId,
            token,
            amount,
            tokenIndexFrom,
            tokenIndexTo,
            minDy,
            deadline
        );
    }

    /**
     * @notice Wraps redeemAndRemove on SynapseBridge
     * Relays to nodes that (typically) a wrapped synAsset ERC20 token has been burned and the underlying needs to be redeeemed on the native chain. This function indicates to the nodes that they should attempt to redeem the LP token for the underlying assets (E.g "swap" out of the LP token)
     * @param to address on other chain to redeem underlying assets to
     * @param chainId which underlying chain to bridge assets onto
     * @param token ERC20 compatible token to deposit into the bridge
     * @param amount Amount of (typically) LP token to pass to the nodes to attempt to removeLiquidity() with to redeem for the underlying assets of the LP token
     * @param liqTokenIndex Specifies which of the underlying LP assets the nodes should attempt to redeem for
     * @param liqMinAmount Specifies the minimum amount of the underlying asset needed for the nodes to execute the redeem/swap
     * @param liqDeadline Specificies the deadline that the nodes are allowed to try to redeem/swap the LP token
     **/
    function redeemAndRemove(
        address to,
        uint256 chainId,
        IERC20 token,
        uint256 amount,
        uint8 liqTokenIndex,
        uint256 liqMinAmount,
        uint256 liqDeadline
    ) external {
        token.safeTransferFrom(msg.sender, address(this), amount);
        if (token.allowance(address(this), address(synapseBridge)) < amount) {
            token.safeApprove(address(synapseBridge), MAX_UINT256);
        }
        synapseBridge.redeemAndRemove(
            to,
            chainId,
            token,
            amount,
            liqTokenIndex,
            liqMinAmount,
            liqDeadline
        );
    }

    /**
    * @notice Wraps SynapseBridge redeemv2() function
   * @param to address on other chain to bridge assets to
   * @param chainId which chain to bridge assets onto
   * @param token ERC20 compatible token to redeem into the bridge
   * @param amount Amount in native token decimals to transfer cross-chain pre-fees
   **/
    function redeemv2(
        bytes32 to,
        uint256 chainId,
        IERC20 token,
        uint256 amount
    ) external {
        token.safeTransferFrom(msg.sender, address(this), amount);

        if (token.allowance(address(this), address(synapseBridge)) < amount) {
            token.safeApprove(address(synapseBridge), MAX_UINT256);
        }
        synapseBridge.redeemv2(to, chainId, token, amount);
    }
}

Settings
{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract ABI

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IERC20","name":"token","type":"address"},{"internalType":"uint8","name":"tokenIndexFrom","type":"uint8"},{"internalType":"uint8","name":"tokenIndexTo","type":"uint8"},{"internalType":"uint256","name":"dx","type":"uint256"},{"internalType":"uint256","name":"minDy","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"}],"name":"swapETHAndRedeem","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"chainId","type":"uint256"},{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"uint8","name":"tokenIndexFrom","type":"uint8"},{"internalType":"uint8","name":"tokenIndexTo","type":"uint8"},{"internalType":"uint256","name":"dx","type":"uint256"},{"internalType":"uint256","name":"minDy","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"swapTokenIndexFrom","type":"uint8"},{"internalType":"uint8","name":"swapTokenIndexTo","type":"uint8"},{"internalType":"uint256","name":"swapMinDy","type":"uint256"},{"internalType":"uint256","name":"swapDeadline","type":"uint256"}],"name":"swapETHAndRedeemAndSwap","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"swapMap","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"swapTokensMap","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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

000000000000000000000000b31f66aa3c1e785363f0875a1b74e27b85fd66c7000000000000000000000000dd60483ace9b215a7c019a44be2f22aa9982652e00000000000000000000000019e1ae0ee35c0404f835521146206595d37981ae000000000000000000000000ed2a7edd7413021d440b09d654f3b87712abab66000000000000000000000000cfc37a6ab183dd4aed08c204d1c2773c0b1bdf46000000000000000000000000c05e61d0e7a63d27546389b7ad62fdff5a91aace

-----Decoded View---------------
Arg [0] : _wethAddress (address): 0xb31f66aa3c1e785363f0875a1b74e27b85fd66c7
Arg [1] : _swapOne (address): 0xdd60483ace9b215a7c019a44be2f22aa9982652e
Arg [2] : tokenOne (address): 0x19e1ae0ee35c0404f835521146206595d37981ae
Arg [3] : _swapTwo (address): 0xed2a7edd7413021d440b09d654f3b87712abab66
Arg [4] : tokenTwo (address): 0xcfc37a6ab183dd4aed08c204d1c2773c0b1bdf46
Arg [5] : _synapseBridge (address): 0xc05e61d0e7a63d27546389b7ad62fdff5a91aace

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000b31f66aa3c1e785363f0875a1b74e27b85fd66c7
Arg [1] : 000000000000000000000000dd60483ace9b215a7c019a44be2f22aa9982652e
Arg [2] : 00000000000000000000000019e1ae0ee35c0404f835521146206595d37981ae
Arg [3] : 000000000000000000000000ed2a7edd7413021d440b09d654f3b87712abab66
Arg [4] : 000000000000000000000000cfc37a6ab183dd4aed08c204d1c2773c0b1bdf46
Arg [5] : 000000000000000000000000c05e61d0e7a63d27546389b7ad62fdff5a91aace


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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