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//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import '@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';

import '../../utils/Constants.sol';
import '../../interfaces/ICurvePool.sol';
import '../interfaces/IStableConverter.sol';

//import "hardhat/console.sol";

contract StableConverter is IStableConverter {
    using SafeERC20 for IERC20Metadata;

    uint256 public constant SLIPPAGE_DENOMINATOR = 10_000;

    ICurvePool public curve3Pool;

    uint256 public defaultSlippage = 30; // 0.3%

    mapping(address => int128) public curve3PoolStableIndex;
    mapping(address => int8) public curve3PoolStableDecimals;

    constructor() {
        curve3Pool = ICurvePool(Constants.CRV_3POOL_ADDRESS);

        curve3PoolStableIndex[Constants.DAI_ADDRESS] = 0; //DAI
        curve3PoolStableDecimals[Constants.DAI_ADDRESS] = 18;

        curve3PoolStableIndex[Constants.USDC_ADDRESS] = 1; //USDC
        curve3PoolStableDecimals[Constants.USDC_ADDRESS] = 6;

        curve3PoolStableIndex[Constants.USDT_ADDRESS] = 2; //USDT
        curve3PoolStableDecimals[Constants.USDT_ADDRESS] = 6;
    }

    function handle(
        address from,
        address to,
        uint256 amount,
        uint256 slippage
    ) public {
        IERC20Metadata(from).safeApprove(address(curve3Pool), amount);

        curve3Pool.exchange(
            curve3PoolStableIndex[from],
            curve3PoolStableIndex[to],
            amount,
            applySlippage(
                amount,
                slippage,
                curve3PoolStableDecimals[to] - curve3PoolStableDecimals[from]
            )
        );

        IERC20Metadata(to).safeTransfer(
            address(msg.sender),
            IERC20Metadata(to).balanceOf(address(this))
        );
    }

    function valuate(
        address from,
        address to,
        uint256 amount
    ) public view returns (uint256) {
        return curve3Pool.get_dy(curve3PoolStableIndex[from], curve3PoolStableIndex[to], amount);
    }

    function applySlippage(
        uint256 amount,
        uint256 slippage,
        int8 decimalsDiff
    ) internal view returns (uint256) {
        require(slippage <= SLIPPAGE_DENOMINATOR, 'Wrong slippage');
        if (slippage == 0) slippage = defaultSlippage;
        uint256 value = (amount * (SLIPPAGE_DENOMINATOR - slippage)) / SLIPPAGE_DENOMINATOR;
        if (decimalsDiff == 0) return value;
        if (decimalsDiff < 0) return value / (10**uint8(decimalsDiff * (-1)));
        return value * (10**uint8(decimalsDiff));
    }
}

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import './ICurvePoolPricable.sol';

interface ICurvePool is ICurvePoolPricable {
    function add_liquidity(uint256[3] memory amounts, uint256 min_mint_amount) external;

    function remove_liquidity(uint256 burn_amount, uint256[3] memory min_amounts) external;

    function remove_liquidity_imbalance(uint256[3] memory amounts, uint256 max_burn_amount)
        external;

    function remove_liquidity_one_coin(
        uint256 burn_amount,
        int128 i,
        uint256 min_received
    ) external;

    function exchange(
        int128 i,
        int128 j,
        uint256 input,
        uint256 min_output
    ) external;

    function get_dy(
        int128 i,
        int128 j,
        uint256 dx
    ) external view returns (uint256);

    function calc_token_amount(uint256[3] memory amounts, bool is_deposit)
        external
        view
        returns (uint256);

    function calc_withdraw_one_coin(uint256 burn_amount, int128 i) external view returns (uint256);
}

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

library Constants {
    bytes32 internal constant USDC_TICKER = 'usdc';
    bytes32 internal constant USDT_TICKER = 'usdt';
    bytes32 internal constant DAI_TICKER = 'dai';
    bytes32 internal constant CRV_TICKER = 'a3CRV';

    uint256 internal constant CVX_BUSD_PID = 3;
    uint256 internal constant CVX_SUSD_PID = 4;
    uint256 internal constant CVX_USDK_PID = 12;
    uint256 internal constant CVX_USDN_PID = 13;
    uint256 internal constant CVX_MUSD_PID = 14;
    uint256 internal constant CVX_RSV_PID = 15;
    uint256 internal constant CVX_DUSD_PID = 17;
    uint256 internal constant CVX_AAVE_PID = 24;
    uint256 internal constant CVX_USDP_PID = 28;
    uint256 internal constant CVX_IRONBANK_PID = 29;
    uint256 internal constant CVX_TUSD_PID = 31;
    uint256 internal constant CVX_FRAX_PID = 32;
    uint256 internal constant CVX_LUSD_PID = 33;
    uint256 internal constant CVX_BUSDV2_PID = 34;
    uint256 internal constant CVX_FRAX_XAI_PID = 38;
    uint256 internal constant CVX_MIM_PID = 40;
    uint256 internal constant CVX_OUSD_PID = 56;
    uint256 internal constant CVX_UST_PID = 59;
    uint256 internal constant CVX_D3_PID = 58;
    uint256 internal constant CVX_PUSD_PID = 91;
    uint256 internal constant CVX_USDD_PID = 96;
    uint256 internal constant CVX_DOLA_PID = 62;
    uint256 internal constant CVX_FRAX_LUSD_PID = 102;
    uint256 internal constant CVX_FRAX_ALUSD_PID = 106;

    uint256 internal constant TRADE_DEADLINE = 2000;

    address internal constant CVX_ADDRESS = 0x4e3FBD56CD56c3e72c1403e103b45Db9da5B9D2B;
    address internal constant CRV_ADDRESS = 0xD533a949740bb3306d119CC777fa900bA034cd52;
    address internal constant USDC_ADDRESS = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48;
    address internal constant USDT_ADDRESS = 0xdAC17F958D2ee523a2206206994597C13D831ec7;
    address internal constant DAI_ADDRESS = 0x6B175474E89094C44Da98b954EedeAC495271d0F;
    address internal constant TUSD_ADDRESS = 0x0000000000085d4780B73119b644AE5ecd22b376;
    address internal constant SUSD_ADDRESS = 0x57Ab1ec28D129707052df4dF418D58a2D46d5f51;
    address internal constant BUSD_ADDRESS = 0x4Fabb145d64652a948d72533023f6E7A623C7C53;
    address internal constant OUSD_ADDRESS = 0x2A8e1E676Ec238d8A992307B495b45B3fEAa5e86;
    address internal constant MUSD_ADDRESS = 0xe2f2a5C287993345a840Db3B0845fbC70f5935a5;
    address internal constant MIM_ADDRESS = 0x99D8a9C45b2ecA8864373A26D1459e3Dff1e17F3;
    address internal constant DUSD_ADDRESS = 0x5BC25f649fc4e26069dDF4cF4010F9f706c23831;
    address internal constant ALUSD_ADDRESS = 0xBC6DA0FE9aD5f3b0d58160288917AA56653660E9;
    address internal constant LUSD_ADDRESS = 0x5f98805A4E8be255a32880FDeC7F6728C6568bA0;
    address internal constant USDP_ADDRESS = 0x1456688345527bE1f37E9e627DA0837D6f08C925;
    address internal constant USDN_ADDRESS = 0x674C6Ad92Fd080e4004b2312b45f796a192D27a0;
    address internal constant USDK_ADDRESS = 0x1c48f86ae57291F7686349F12601910BD8D470bb;
    address internal constant FRAX_ADDRESS = 0x853d955aCEf822Db058eb8505911ED77F175b99e;
    address internal constant RSV_ADDRESS = 0x196f4727526eA7FB1e17b2071B3d8eAA38486988;
    address internal constant UST_ADDRESS = 0xa47c8bf37f92aBed4A126BDA807A7b7498661acD;
    address internal constant PUSD_ADDRESS = 0x466a756E9A7401B5e2444a3fCB3c2C12FBEa0a54;
    address internal constant USDD_ADDRESS = 0x0C10bF8FcB7Bf5412187A595ab97a3609160b5c6;
    address internal constant DOLA_ADDRESS = 0x865377367054516e17014CcdED1e7d814EDC9ce4;
    address internal constant WETH_ADDRESS = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address internal constant SUSHI_ROUTER_ADDRESS = 0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F;
    address internal constant SUSHI_CRV_WETH_ADDRESS = 0x58Dc5a51fE44589BEb22E8CE67720B5BC5378009;
    address internal constant SUSHI_WETH_CVX_ADDRESS = 0x05767d9EF41dC40689678fFca0608878fb3dE906;
    address internal constant SUSHI_WETH_USDT_ADDRESS = 0x06da0fd433C1A5d7a4faa01111c044910A184553;
    address internal constant CVX_BOOSTER_ADDRESS = 0xF403C135812408BFbE8713b5A23a04b3D48AAE31;
    address internal constant CRV_3POOL_ADDRESS = 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7;
    address internal constant CRV_3POOL_LP_ADDRESS = 0x6c3F90f043a72FA612cbac8115EE7e52BDe6E490;
    address internal constant CRV_AAVE_ADDRESS = 0xDeBF20617708857ebe4F679508E7b7863a8A8EeE;
    address internal constant CRV_AAVE_LP_ADDRESS = 0xFd2a8fA60Abd58Efe3EeE34dd494cD491dC14900;
    address internal constant CVX_AAVE_REWARDS_ADDRESS = 0xE82c1eB4BC6F92f85BF7EB6421ab3b882C3F5a7B;
    address internal constant CRV_IRONBANK_ADDRESS = 0x2dded6Da1BF5DBdF597C45fcFaa3194e53EcfeAF;
    address internal constant CRV_IRONBANK_LP_ADDRESS = 0x5282a4eF67D9C33135340fB3289cc1711c13638C;
    address internal constant CVX_IRONBANK_REWARDS_ADDRESS =
        0x3E03fFF82F77073cc590b656D42FceB12E4910A8;
    address internal constant CRV_TUSD_ADDRESS = 0xEcd5e75AFb02eFa118AF914515D6521aaBd189F1;
    address internal constant CRV_TUSD_LP_ADDRESS = 0xEcd5e75AFb02eFa118AF914515D6521aaBd189F1;
    address internal constant CVX_TUSD_REWARDS_ADDRESS = 0x308b48F037AAa75406426dACFACA864ebd88eDbA;
    address internal constant CRV_SUSD_ADDRESS = 0xA5407eAE9Ba41422680e2e00537571bcC53efBfD;
    address internal constant CRV_SUSD_LP_ADDRESS = 0xC25a3A3b969415c80451098fa907EC722572917F;
    address internal constant CVX_SUSD_REWARDS_ADDRESS = 0x22eE18aca7F3Ee920D01F25dA85840D12d98E8Ca;
    address internal constant CVX_SUSD_EXTRA_ADDRESS = 0x81fCe3E10D12Da6c7266a1A169c4C96813435263;
    address internal constant SUSD_EXTRA_ADDRESS = 0xC011a73ee8576Fb46F5E1c5751cA3B9Fe0af2a6F;
    address internal constant SUSD_EXTRA_PAIR_ADDRESS = 0xA1d7b2d891e3A1f9ef4bBC5be20630C2FEB1c470;
    address internal constant CRV_USDK_ADDRESS = 0x3E01dD8a5E1fb3481F0F589056b428Fc308AF0Fb;
    address internal constant CRV_USDK_LP_ADDRESS = 0x97E2768e8E73511cA874545DC5Ff8067eB19B787;
    address internal constant CVX_USDK_REWARDS_ADDRESS = 0xa50e9071aCaD20b31cd2bbe4dAa816882De82BBe;
    address internal constant CRV_USDP_ADDRESS = 0x42d7025938bEc20B69cBae5A77421082407f053A;
    address internal constant CRV_USDP_LP_ADDRESS = 0x7Eb40E450b9655f4B3cC4259BCC731c63ff55ae6;
    address internal constant CVX_USDP_REWARDS_ADDRESS = 0x24DfFd1949F888F91A0c8341Fc98a3F280a782a8;
    address internal constant CVX_USDP_EXTRA_ADDRESS = 0x5F91615268bE6b4aDD646b2560785B8F17dccBb4;
    address internal constant USDP_EXTRA_ADDRESS = 0x92E187a03B6CD19CB6AF293ba17F2745Fd2357D5;
    address internal constant USDP_EXTRA_PAIR_ADDRESS = 0x69aa90C6cD099BF383Bd9A0ac29E61BbCbF3b8D9;
    address internal constant CRV_BUSD_ADDRESS = 0x79a8C46DeA5aDa233ABaFFD40F3A0A2B1e5A4F27;
    address internal constant CRV_BUSD_LP_ADDRESS = 0x3B3Ac5386837Dc563660FB6a0937DFAa5924333B;
    address internal constant CVX_BUSD_REWARDS_ADDRESS = 0x602c4cD53a715D8a7cf648540FAb0d3a2d546560;
    address internal constant CRV_BUSDV2_ADDRESS = 0x4807862AA8b2bF68830e4C8dc86D0e9A998e085a;
    address internal constant CRV_BUSDV2_LP_ADDRESS = 0x4807862AA8b2bF68830e4C8dc86D0e9A998e085a;
    address internal constant CVX_BUSDV2_REWARDS_ADDRESS =
        0xbD223812d360C9587921292D0644D18aDb6a2ad0;
    address internal constant CRV_OUSD_ADDRESS = 0x87650D7bbfC3A9F10587d7778206671719d9910D;
    address internal constant CRV_OUSD_LP_ADDRESS = 0x87650D7bbfC3A9F10587d7778206671719d9910D;
    address internal constant CRV_OUSD_EXTRA_ADDRESS = 0x8A05801c1512F6018e450b0F69e9Ca7b985fCea3;
    address internal constant OUSD_EXTRA_ADDRESS = 0x8207c1FfC5B6804F6024322CcF34F29c3541Ae26;
    address internal constant OUSD_EXTRA_PAIR_ADDRESS = 0x72ea6Ca0D47b337f1EA44314d9d90E2A897eDaF5;
    address internal constant CVX_OUSD_REWARDS_ADDRESS = 0x7D536a737C13561e0D2Decf1152a653B4e615158;
    address internal constant CRV_USDN_ADDRESS = 0x0f9cb53Ebe405d49A0bbdBD291A65Ff571bC83e1;
    address internal constant CRV_USDN_LP_ADDRESS = 0x4f3E8F405CF5aFC05D68142F3783bDfE13811522;
    address internal constant CVX_USDN_REWARDS_ADDRESS = 0x4a2631d090e8b40bBDe245e687BF09e5e534A239;
    address internal constant CRV_LUSD_ADDRESS = 0xEd279fDD11cA84bEef15AF5D39BB4d4bEE23F0cA;
    address internal constant CRV_LUSD_LP_ADDRESS = 0xEd279fDD11cA84bEef15AF5D39BB4d4bEE23F0cA;
    address internal constant CVX_LUSD_REWARDS_ADDRESS = 0x2ad92A7aE036a038ff02B96c88de868ddf3f8190;
    address internal constant CRV_MUSD_ADDRESS = 0x8474DdbE98F5aA3179B3B3F5942D724aFcdec9f6;
    address internal constant CRV_MUSD_LP_ADDRESS = 0x1AEf73d49Dedc4b1778d0706583995958Dc862e6;
    address internal constant CVX_MUSD_REWARDS_ADDRESS = 0xDBFa6187C79f4fE4Cda20609E75760C5AaE88e52;
    address internal constant CVX_MUSD_EXTRA_ADDRESS = 0x93A5C724c4992FCBDA6b96F06fa15EB8B5c485b7;
    address internal constant MUSD_EXTRA_ADDRESS = 0xa3BeD4E1c75D00fa6f4E5E6922DB7261B5E9AcD2;
    address internal constant MUSD_EXTRA_PAIR_ADDRESS = 0x663242D053057f317A773D7c262B700616d0b9A0;
    address internal constant CRV_DUSD_ADDRESS = 0x8038C01A0390a8c547446a0b2c18fc9aEFEcc10c;
    address internal constant CRV_DUSD_LP_ADDRESS = 0x3a664Ab939FD8482048609f652f9a0B0677337B9;
    address internal constant CVX_DUSD_REWARDS_ADDRESS = 0x1992b82A8cCFC8f89785129D6403b13925d6226E;
    address internal constant CVX_DUSD_EXTRA_ADDRESS = 0x666F8eEE6FD6839853993977CC86a7A51425673C;
    address internal constant DUSD_EXTRA_ADDRESS = 0x20c36f062a31865bED8a5B1e512D9a1A20AA333A;
    address internal constant DUSD_EXTRA_PAIR_ADDRESS = 0x663242D053057f317A773D7c262B700616d0b9A0;
    address internal constant CRV_RSV_ADDRESS = 0xC18cC39da8b11dA8c3541C598eE022258F9744da;
    address internal constant CRV_RSV_LP_ADDRESS = 0xC2Ee6b0334C261ED60C72f6054450b61B8f18E35;
    address internal constant CVX_RSV_REWARDS_ADDRESS = 0xedfCCF611D7c40F43e77a1340cE2C29EEEC27205;
    address internal constant CRV_FRAX_ADDRESS = 0xd632f22692FaC7611d2AA1C0D552930D43CAEd3B;
    address internal constant CRV_FRAX_LP_ADDRESS = 0xd632f22692FaC7611d2AA1C0D552930D43CAEd3B;
    address internal constant CVX_FRAX_REWARDS_ADDRESS = 0xB900EF131301B307dB5eFcbed9DBb50A3e209B2e;
    address internal constant CRV_MIM_ADDRESS = 0x5a6A4D54456819380173272A5E8E9B9904BdF41B;
    address internal constant CRV_MIM_LP_ADDRESS = 0x5a6A4D54456819380173272A5E8E9B9904BdF41B;
    address internal constant CVX_MIM_REWARDS_ADDRESS = 0xFd5AbF66b003881b88567EB9Ed9c651F14Dc4771;
    address internal constant CVX_MIM_EXTRA_ADDRESS = 0x69a92f1656cd2e193797546cFe2EaF32EACcf6f7;
    address internal constant MIM_EXTRA_ADDRESS = 0x090185f2135308BaD17527004364eBcC2D37e5F6;
    address internal constant MIM_EXTRA_PAIR_ADDRESS = 0xb5De0C3753b6E1B4dBA616Db82767F17513E6d4E;
    address internal constant CRV_UST_WORMHOLE_ADDRESS = 0xCEAF7747579696A2F0bb206a14210e3c9e6fB269;
    address internal constant CRV_UST_WORMHOLE_LP_ADDRESS =
        0xCEAF7747579696A2F0bb206a14210e3c9e6fB269;
    address internal constant CVX_UST_WORMHOLE_REWARDS_ADDRESS =
        0x7e2b9B5244bcFa5108A76D5E7b507CFD5581AD4A;
    address internal constant CRV_D3_ADDRESS = 0xBaaa1F5DbA42C3389bDbc2c9D2dE134F5cD0Dc89;
    address internal constant CRV_D3_LP_ADDRESS = 0xBaaa1F5DbA42C3389bDbc2c9D2dE134F5cD0Dc89;
    address internal constant CVX_D3_REWARDS_ADDRESS = 0x329cb014b562d5d42927cfF0dEdF4c13ab0442EF;
    address internal constant CRV_PUSD_ADDRESS = 0x8EE017541375F6Bcd802ba119bdDC94dad6911A1;
    address internal constant CRV_PUSD_LP_ADDRESS = 0x8EE017541375F6Bcd802ba119bdDC94dad6911A1;
    address internal constant CVX_PUSD_REWARDS_ADDRESS = 0x83a3CE160915675F5bC7cC3CfDA5f4CeBC7B7a5a;
    address internal constant CRV_USDD_ADDRESS = 0xe6b5CC1B4b47305c58392CE3D359B10282FC36Ea;
    address internal constant CRV_USDD_LP_ADDRESS = 0xe6b5CC1B4b47305c58392CE3D359B10282FC36Ea;
    address internal constant CVX_USDD_REWARDS_ADDRESS = 0x7D475cc8A5E0416f0e63042547aDB94ca7045A5b;
    address internal constant CRV_DOLA_ADDRESS = 0xAA5A67c256e27A5d80712c51971408db3370927D;
    address internal constant CRV_DOLA_LP_ADDRESS = 0xAA5A67c256e27A5d80712c51971408db3370927D;
    address internal constant CRV_DOLA_REWARDS_ADDRESS = 0x835f69e58087E5B6bffEf182fe2bf959Fe253c3c;
    address internal constant CRV_FRAX_LUSD_ADDRESS = 0x497CE58F34605B9944E6b15EcafE6b001206fd25;
    address internal constant CRV_FRAX_LUSD_LP_ADDRESS = 0x497CE58F34605B9944E6b15EcafE6b001206fd25;
    address internal constant CVX_FRAX_LUSD_REWARDS_ADDRESS =
        0x053e1dad223A206e6BCa24C77786bb69a10e427d;
    address internal constant CRV_FRAX_ALUSD_ADDRESS = 0xB30dA2376F63De30b42dC055C93fa474F31330A5;
    address internal constant CRV_FRAX_ALUSD_LP_ADDRESS =
        0xB30dA2376F63De30b42dC055C93fa474F31330A5;
    address internal constant CVX_FRAX_ALUSD_REWARDS_ADDRESS =
        0x26598e3E511ADFadefD70ab2C3475Ff741741104;
    address internal constant FRAX_USDC_ADDRESS = 0xDcEF968d416a41Cdac0ED8702fAC8128A64241A2;
    address internal constant FRAX_USDC_LP_ADDRESS = 0x3175Df0976dFA876431C2E9eE6Bc45b65d3473CC;
    address internal constant SDT_MIM_VAULT_ADDRESS = 0x98dd95D0ac5b70B0F4ae5080a1C2EeA8c5c48387;
    address internal constant SDT_MIM_SPELL_ADDRESS = 0x090185f2135308BaD17527004364eBcC2D37e5F6;

    address internal constant CRV_FRAX_XAI_ADDRESS = 0x326290A1B0004eeE78fa6ED4F1d8f4b2523ab669;
    address internal constant CRV_FRAX_XAI_LP_ADDRESS = 0x326290A1B0004eeE78fa6ED4F1d8f4b2523ab669;
}

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IStableConverter {
    function handle(
        address from,
        address to,
        uint256 amount,
        uint256 slippage
    ) external;

    function valuate(
        address from,
        address to,
        uint256 amount
    ) external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.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 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'
        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) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _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
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

//SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface ICurvePoolPricable {
    function get_virtual_price() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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");

        (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");

        (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");

        (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");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"SLIPPAGE_DENOMINATOR","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"curve3Pool","outputs":[{"internalType":"contract ICurvePool","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"curve3PoolStableDecimals","outputs":[{"internalType":"int8","name":"","type":"int8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"curve3PoolStableIndex","outputs":[{"internalType":"int128","name":"","type":"int128"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"defaultSlippage","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"slippage","type":"uint256"}],"name":"handle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"valuate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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