Address Details

contract

0x3e60cE358ee58748456d17ffF72941Ec92eE1DB8

Contract Name: ExchangeProxy

Creator: 0xe456f9–e60f03 at 0x5560b1–fd48ce

Balance: 0 CELO ( )

Locked CELO Balance: 0.00 CELO

Voting CELO Balance: 0.00 CELO

Pending Unlocked Gold: 0.00 CELO

Tokens: Fetching tokens... Error trying to fetch balances.

Transactions: 0 Transactions

Transfers: 0 Transfers

Gas Used: Fetching gas used...

Last Balance Update: 11126716

Transactions Internal Transactions Coin Balance History Logs Code Read Contract Write Contract

This contract has been verified via Sourcify. View contract in Sourcify repository

Contract name:: ExchangeProxy
Optimization enabled: true

Compiler version: v0.8.11+commit.d7f03943
Optimization runs: 200

EVM Version: london
Verified at: 2022-01-26T15:50:35.861146Z

contracts/proxies/ExchangeProxy.sol

// SPDX-License-Identifier: MIT

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity >=0.7.12;
pragma experimental ABIEncoderV2;

contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return payable(msg.sender);
    }

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

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

        return c;
    }

    /**
     * @dev Returns the 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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

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

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

interface PoolInterface {
    function swapExactAmountIn(address, uint, address, uint, uint) external returns (uint, uint);
    function swapExactAmountOut(address, uint, address, uint, uint) external returns (uint, uint);
    function calcInGivenOut(uint, uint, uint, uint, uint, uint) external pure returns (uint);
    function calcOutGivenIn(uint, uint, uint, uint, uint, uint) external pure returns (uint);
    function getDenormalizedWeight(address) external view returns (uint);
    function getBalance(address) external view returns (uint);
    function getSwapFee() external view returns (uint);
}

interface TokenInterface {
    function balanceOf(address) external view returns (uint);
    function allowance(address, address) external view returns (uint);
    function approve(address, uint) external returns (bool);
    function transfer(address, uint) external returns (bool);
    function transferFrom(address, address, uint) external returns (bool);
    function deposit() external payable;
    function withdraw(uint) external;
}

interface RegistryInterface {
    function getBestPoolsWithLimit(address, address, uint) external view returns (address[] memory);
}

contract ExchangeProxy is Ownable {

    using SafeMath for uint256;

    struct Pool {
        address pool;
        uint    tokenBalanceIn;
        uint    tokenWeightIn;
        uint    tokenBalanceOut;
        uint    tokenWeightOut;
        uint    swapFee;
        uint    effectiveLiquidity;
    }

    struct Swap {
        address pool;
        address tokenIn;
        address tokenOut;
        uint    swapAmount; // tokenInAmount / tokenOutAmount
        uint    limitReturnAmount; // minAmountOut / maxAmountIn
        uint    maxPrice;
    }

    TokenInterface weth;
    RegistryInterface registry;
    address private constant ETH_ADDRESS = address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
    uint private constant BONE = 10**18;

    constructor(address _weth) {
        weth = TokenInterface(_weth);
    }

    function setRegistry(address _registry) external onlyOwner {
        registry = RegistryInterface(_registry);
    }

    function batchSwapExactIn(
        Swap[] memory swaps,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint totalAmountIn,
        uint minTotalAmountOut
    )
        public payable
        returns (uint totalAmountOut)
    {
        transferFromAll(tokenIn, totalAmountIn);

        for (uint i = 0; i < swaps.length; i++) {
            Swap memory swap = swaps[i];
            TokenInterface SwapTokenIn = TokenInterface(swap.tokenIn);
            PoolInterface pool = PoolInterface(swap.pool);

            if (SwapTokenIn.allowance(address(this), swap.pool) > 0) {
                SwapTokenIn.approve(swap.pool, 0);
            }
            SwapTokenIn.approve(swap.pool, swap.swapAmount);

            (uint tokenAmountOut,) = pool.swapExactAmountIn(
                                        swap.tokenIn,
                                        swap.swapAmount,
                                        swap.tokenOut,
                                        swap.limitReturnAmount,
                                        swap.maxPrice
                                    );
            totalAmountOut = tokenAmountOut.add(totalAmountOut);
        }

        require(totalAmountOut >= minTotalAmountOut, "ERR_LIMIT_OUT");

        transferAll(tokenOut, totalAmountOut);
        transferAll(tokenIn, getBalance(tokenIn));
    }

    function batchSwapExactOut(
        Swap[] memory swaps,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint maxTotalAmountIn
    )
        public payable
        returns (uint totalAmountIn)
    {
        transferFromAll(tokenIn, maxTotalAmountIn);

        for (uint i = 0; i < swaps.length; i++) {
            Swap memory swap = swaps[i];
            TokenInterface SwapTokenIn = TokenInterface(swap.tokenIn);
            PoolInterface pool = PoolInterface(swap.pool);

            if (SwapTokenIn.allowance(address(this), swap.pool) > 0) {
                SwapTokenIn.approve(swap.pool, 0);
            }
            SwapTokenIn.approve(swap.pool, swap.limitReturnAmount);

            (uint tokenAmountIn,) = pool.swapExactAmountOut(
                                        swap.tokenIn,
                                        swap.limitReturnAmount,
                                        swap.tokenOut,
                                        swap.swapAmount,
                                        swap.maxPrice
                                    );
            totalAmountIn = tokenAmountIn.add(totalAmountIn);
        }
        require(totalAmountIn <= maxTotalAmountIn, "ERR_LIMIT_IN");

        transferAll(tokenOut, getBalance(tokenOut));
        transferAll(tokenIn, getBalance(tokenIn));

    }

    function multihopBatchSwapExactIn(
        Swap[][] memory swapSequences,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint totalAmountIn,
        uint minTotalAmountOut
    )
        public payable
        returns (uint totalAmountOut)
    {

        transferFromAll(tokenIn, totalAmountIn);

        for (uint i = 0; i < swapSequences.length; i++) {
            uint tokenAmountOut;
            for (uint k = 0; k < swapSequences[i].length; k++) {
                Swap memory swap = swapSequences[i][k];
                TokenInterface SwapTokenIn = TokenInterface(swap.tokenIn);
                if (k == 1) {
                    // Makes sure that on the second swap the output of the first was used
                    // so there is not intermediate token leftover
                    swap.swapAmount = tokenAmountOut;
                }

                PoolInterface pool = PoolInterface(swap.pool);
                if (SwapTokenIn.allowance(address(this), swap.pool) > 0) {
                    SwapTokenIn.approve(swap.pool, 0);
                }
                SwapTokenIn.approve(swap.pool, swap.swapAmount);
                (tokenAmountOut,) = pool.swapExactAmountIn(
                                            swap.tokenIn,
                                            swap.swapAmount,
                                            swap.tokenOut,
                                            swap.limitReturnAmount,
                                            swap.maxPrice
                                        );
            }
            // This takes the amountOut of the last swap
            totalAmountOut = tokenAmountOut.add(totalAmountOut);
        }

        require(totalAmountOut >= minTotalAmountOut, "ERR_LIMIT_OUT");

        transferAll(tokenOut, totalAmountOut);
        transferAll(tokenIn, getBalance(tokenIn));

    }

    function multihopBatchSwapExactOut(
        Swap[][] memory swapSequences,
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint maxTotalAmountIn
    )
        public payable
        returns (uint totalAmountIn)
    {

        transferFromAll(tokenIn, maxTotalAmountIn);

        for (uint i = 0; i < swapSequences.length; i++) {
            uint tokenAmountInFirstSwap;
            // Specific code for a simple swap and a multihop (2 swaps in sequence)
            if (swapSequences[i].length == 1) {
                Swap memory swap = swapSequences[i][0];
                TokenInterface SwapTokenIn = TokenInterface(swap.tokenIn);

                PoolInterface pool = PoolInterface(swap.pool);
                if (SwapTokenIn.allowance(address(this), swap.pool) > 0) {
                    SwapTokenIn.approve(swap.pool, 0);
                }
                SwapTokenIn.approve(swap.pool, swap.limitReturnAmount);

                (tokenAmountInFirstSwap,) = pool.swapExactAmountOut(
                                        swap.tokenIn,
                                        swap.limitReturnAmount,
                                        swap.tokenOut,
                                        swap.swapAmount,
                                        swap.maxPrice
                                    );
            } else {
                // Consider we are swapping A -> B and B -> C. The goal is to buy a given amount
                // of token C. But first we need to buy B with A so we can then buy C with B
                // To get the exact amount of C we then first need to calculate how much B we'll need:
                uint intermediateTokenAmount; // This would be token B as described above
                Swap memory secondSwap = swapSequences[i][1];
                PoolInterface poolSecondSwap = PoolInterface(secondSwap.pool);
                intermediateTokenAmount = poolSecondSwap.calcInGivenOut(
                                        poolSecondSwap.getBalance(secondSwap.tokenIn),
                                        poolSecondSwap.getDenormalizedWeight(secondSwap.tokenIn),
                                        poolSecondSwap.getBalance(secondSwap.tokenOut),
                                        poolSecondSwap.getDenormalizedWeight(secondSwap.tokenOut),
                                        secondSwap.swapAmount,
                                        poolSecondSwap.getSwapFee()
                                    );

                //// Buy intermediateTokenAmount of token B with A in the first pool
                Swap memory firstSwap = swapSequences[i][0];
                TokenInterface FirstSwapTokenIn = TokenInterface(firstSwap.tokenIn);
                PoolInterface poolFirstSwap = PoolInterface(firstSwap.pool);
                if (FirstSwapTokenIn.allowance(address(this), firstSwap.pool) < type(uint256).max) {
                    FirstSwapTokenIn.approve(firstSwap.pool, type(uint256).max);
                }

                (tokenAmountInFirstSwap,) = poolFirstSwap.swapExactAmountOut(
                                        firstSwap.tokenIn,
                                        firstSwap.limitReturnAmount,
                                        firstSwap.tokenOut,
                                        intermediateTokenAmount, // This is the amount of token B we need
                                        firstSwap.maxPrice
                                    );

                //// Buy the final amount of token C desired
                TokenInterface SecondSwapTokenIn = TokenInterface(secondSwap.tokenIn);
                if (SecondSwapTokenIn.allowance(address(this), secondSwap.pool) < type(uint256).max) {
                    SecondSwapTokenIn.approve(secondSwap.pool, type(uint256).max);
                }

                poolSecondSwap.swapExactAmountOut(
                                        secondSwap.tokenIn,
                                        secondSwap.limitReturnAmount,
                                        secondSwap.tokenOut,
                                        secondSwap.swapAmount,
                                        secondSwap.maxPrice
                                    );
            }
            totalAmountIn = tokenAmountInFirstSwap.add(totalAmountIn);
        }

        require(totalAmountIn <= maxTotalAmountIn, "ERR_LIMIT_IN");

        transferAll(tokenOut, getBalance(tokenOut));
        transferAll(tokenIn, getBalance(tokenIn));

    }

    function smartSwapExactIn(
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint totalAmountIn,
        uint minTotalAmountOut,
        uint nPools
    )
        public payable
        returns (uint totalAmountOut)
    {
        Swap[] memory swaps;
        if (isETH(tokenIn)) {
          (swaps,) = viewSplitExactIn(address(weth), address(tokenOut), totalAmountIn, nPools);
        } else if (isETH(tokenOut)){
          (swaps,) = viewSplitExactIn(address(tokenIn), address(weth), totalAmountIn, nPools);
        } else {
          (swaps,) = viewSplitExactIn(address(tokenIn), address(tokenOut), totalAmountIn, nPools);
        }

        totalAmountOut = batchSwapExactIn(swaps, tokenIn, tokenOut, totalAmountIn, minTotalAmountOut);
    }

    function smartSwapExactOut(
        TokenInterface tokenIn,
        TokenInterface tokenOut,
        uint totalAmountOut,
        uint maxTotalAmountIn,
        uint nPools
    )
        public payable
        returns (uint totalAmountIn)
    {
        Swap[] memory swaps;
        if (isETH(tokenIn)) {
          (swaps,) = viewSplitExactOut(address(weth), address(tokenOut), totalAmountOut, nPools);
        } else if (isETH(tokenOut)){
          (swaps,) = viewSplitExactOut(address(tokenIn), address(weth), totalAmountOut, nPools);
        } else {
          (swaps,) = viewSplitExactOut(address(tokenIn), address(tokenOut), totalAmountOut, nPools);
        }

        totalAmountIn = batchSwapExactOut(swaps, tokenIn, tokenOut, maxTotalAmountIn);
    }

    function viewSplitExactIn(
        address tokenIn,
        address tokenOut,
        uint swapAmount,
        uint nPools
    )
        public view
        returns (Swap[] memory swaps, uint totalOutput)
    {
        address[] memory poolAddresses = registry.getBestPoolsWithLimit(tokenIn, tokenOut, nPools);

        Pool[] memory pools = new Pool[](poolAddresses.length);
        uint sumEffectiveLiquidity;
        for (uint i = 0; i < poolAddresses.length; i++) {
            pools[i] = getPoolData(tokenIn, tokenOut, poolAddresses[i]);
            sumEffectiveLiquidity = sumEffectiveLiquidity.add(pools[i].effectiveLiquidity);
        }

        uint[] memory bestInputAmounts = new uint[](pools.length);
        uint totalInputAmount;
        for (uint i = 0; i < pools.length; i++) {
            bestInputAmounts[i] = swapAmount.mul(pools[i].effectiveLiquidity).div(sumEffectiveLiquidity);
            totalInputAmount = totalInputAmount.add(bestInputAmounts[i]);
        }

        if (totalInputAmount < swapAmount) {
            bestInputAmounts[0] = bestInputAmounts[0].add(swapAmount.sub(totalInputAmount));
        } else {
            bestInputAmounts[0] = bestInputAmounts[0].sub(totalInputAmount.sub(swapAmount));
        }

        swaps = new Swap[](pools.length);

        for (uint i = 0; i < pools.length; i++) {
            swaps[i] = Swap({
                        pool: pools[i].pool,
                        tokenIn: tokenIn,
                        tokenOut: tokenOut,
                        swapAmount: bestInputAmounts[i],
                        limitReturnAmount: 0,
                        maxPrice: type(uint256).max
                    });
        }

        totalOutput = calcTotalOutExactIn(bestInputAmounts, pools);

        return (swaps, totalOutput);
    }

    function viewSplitExactOut(
        address tokenIn,
        address tokenOut,
        uint swapAmount,
        uint nPools
    )
        public view
        returns (Swap[] memory swaps, uint totalOutput)
    {
        address[] memory poolAddresses = registry.getBestPoolsWithLimit(tokenIn, tokenOut, nPools);

        Pool[] memory pools = new Pool[](poolAddresses.length);
        uint sumEffectiveLiquidity;
        for (uint i = 0; i < poolAddresses.length; i++) {
            pools[i] = getPoolData(tokenIn, tokenOut, poolAddresses[i]);
            sumEffectiveLiquidity = sumEffectiveLiquidity.add(pools[i].effectiveLiquidity);
        }

        uint[] memory bestInputAmounts = new uint[](pools.length);
        uint totalInputAmount;
        for (uint i = 0; i < pools.length; i++) {
            bestInputAmounts[i] = swapAmount.mul(pools[i].effectiveLiquidity).div(sumEffectiveLiquidity);
            totalInputAmount = totalInputAmount.add(bestInputAmounts[i]);
        }

         if (totalInputAmount < swapAmount) {
            bestInputAmounts[0] = bestInputAmounts[0].add(swapAmount.sub(totalInputAmount));
        } else {
            bestInputAmounts[0] = bestInputAmounts[0].sub(totalInputAmount.sub(swapAmount));
        }

        swaps = new Swap[](pools.length);

        for (uint i = 0; i < pools.length; i++) {
            swaps[i] = Swap({
                        pool: pools[i].pool,
                        tokenIn: tokenIn,
                        tokenOut: tokenOut,
                        swapAmount: bestInputAmounts[i],
                        limitReturnAmount: type(uint256).max,
                        maxPrice: type(uint256).max
                    });
        }

        totalOutput = calcTotalOutExactOut(bestInputAmounts, pools);

        return (swaps, totalOutput);
    }

    function getPoolData(
        address tokenIn,
        address tokenOut,
        address poolAddress
    )
        internal view
        returns (Pool memory)
    {
        PoolInterface pool = PoolInterface(poolAddress);
        uint tokenBalanceIn = pool.getBalance(tokenIn);
        uint tokenBalanceOut = pool.getBalance(tokenOut);
        uint tokenWeightIn = pool.getDenormalizedWeight(tokenIn);
        uint tokenWeightOut = pool.getDenormalizedWeight(tokenOut);
        uint swapFee = pool.getSwapFee();

        uint effectiveLiquidity = calcEffectiveLiquidity(
                                            tokenWeightIn,
                                            tokenBalanceOut,
                                            tokenWeightOut
                                        );
        Pool memory returnPool = Pool({
            pool: poolAddress,
            tokenBalanceIn: tokenBalanceIn,
            tokenWeightIn: tokenWeightIn,
            tokenBalanceOut: tokenBalanceOut,
            tokenWeightOut: tokenWeightOut,
            swapFee: swapFee,
            effectiveLiquidity: effectiveLiquidity
        });

        return returnPool;
    }

    function calcEffectiveLiquidity(
        uint tokenWeightIn,
        uint tokenBalanceOut,
        uint tokenWeightOut
    )
        internal pure
        returns (uint effectiveLiquidity)
    {

        // Bo * wi/(wi+wo)
        effectiveLiquidity =
            tokenWeightIn.mul(BONE).div(
                tokenWeightOut.add(tokenWeightIn)
            ).mul(tokenBalanceOut).div(BONE);

        return effectiveLiquidity;
    }

    function calcTotalOutExactIn(
        uint[] memory bestInputAmounts,
        Pool[] memory bestPools
    )
        internal pure
        returns (uint totalOutput)
    {
        totalOutput = 0;
        for (uint i = 0; i < bestInputAmounts.length; i++) {
            uint output = PoolInterface(bestPools[i].pool).calcOutGivenIn(
                                bestPools[i].tokenBalanceIn,
                                bestPools[i].tokenWeightIn,
                                bestPools[i].tokenBalanceOut,
                                bestPools[i].tokenWeightOut,
                                bestInputAmounts[i],
                                bestPools[i].swapFee
                            );

            totalOutput = totalOutput.add(output);
        }
        return totalOutput;
    }

    function calcTotalOutExactOut(
        uint[] memory bestInputAmounts,
        Pool[] memory bestPools
    )
        internal pure
        returns (uint totalOutput)
    {
        totalOutput = 0;
        for (uint i = 0; i < bestInputAmounts.length; i++) {
            uint output = PoolInterface(bestPools[i].pool).calcInGivenOut(
                                bestPools[i].tokenBalanceIn,
                                bestPools[i].tokenWeightIn,
                                bestPools[i].tokenBalanceOut,
                                bestPools[i].tokenWeightOut,
                                bestInputAmounts[i],
                                bestPools[i].swapFee
                            );

            totalOutput = totalOutput.add(output);
        }
        return totalOutput;
    }

    function transferFromAll(TokenInterface token, uint amount) internal returns(bool) {
        if (isETH(token)) {
            weth.deposit{value: msg.value}();
        } else {
            require(token.transferFrom(msg.sender, address(this), amount), "ERR_TRANSFER_FAILED");
        }
        return true;
    }

    function getBalance(TokenInterface token) internal view returns (uint) {
        if (isETH(token)) {
            return weth.balanceOf(address(this));
        } else {
            return token.balanceOf(address(this));
        }
    }

    function transferAll(TokenInterface token, uint amount) internal returns(bool) {
        if (amount == 0) {
            return true;
        }

        if (isETH(token)) {
            weth.withdraw(amount);
            (bool xfer,) = msg.sender.call{value: amount}("");
            require(xfer, "ERR_ETH_FAILED");
        } else {
            require(token.transfer(msg.sender, amount), "ERR_TRANSFER_FAILED");
        }
        return true;
    }

    function isETH(TokenInterface token) internal pure returns(bool) {
        return (address(token) == ETH_ADDRESS);
    }

     receive() external payable {}
}

Contract ABI

[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_weth","internalType":"address"}]},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256","name":"totalAmountOut","internalType":"uint256"}],"name":"batchSwapExactIn","inputs":[{"type":"tuple[]","name":"swaps","internalType":"struct ExchangeProxy.Swap[]","components":[{"type":"address","name":"pool","internalType":"address"},{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"swapAmount","internalType":"uint256"},{"type":"uint256","name":"limitReturnAmount","internalType":"uint256"},{"type":"uint256","name":"maxPrice","internalType":"uint256"}]},{"type":"address","name":"tokenIn","internalType":"contract TokenInterface"},{"type":"address","name":"tokenOut","internalType":"contract TokenInterface"},{"type":"uint256","name":"totalAmountIn","internalType":"uint256"},{"type":"uint256","name":"minTotalAmountOut","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256","name":"totalAmountIn","internalType":"uint256"}],"name":"batchSwapExactOut","inputs":[{"type":"tuple[]","name":"swaps","internalType":"struct ExchangeProxy.Swap[]","components":[{"type":"address","name":"pool","internalType":"address"},{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"swapAmount","internalType":"uint256"},{"type":"uint256","name":"limitReturnAmount","internalType":"uint256"},{"type":"uint256","name":"maxPrice","internalType":"uint256"}]},{"type":"address","name":"tokenIn","internalType":"contract TokenInterface"},{"type":"address","name":"tokenOut","internalType":"contract TokenInterface"},{"type":"uint256","name":"maxTotalAmountIn","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isOwner","inputs":[]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256","name":"totalAmountOut","internalType":"uint256"}],"name":"multihopBatchSwapExactIn","inputs":[{"type":"tuple[][]","name":"swapSequences","internalType":"struct ExchangeProxy.Swap[][]","components":[{"type":"address","name":"pool","internalType":"address"},{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"swapAmount","internalType":"uint256"},{"type":"uint256","name":"limitReturnAmount","internalType":"uint256"},{"type":"uint256","name":"maxPrice","internalType":"uint256"}]},{"type":"address","name":"tokenIn","internalType":"contract TokenInterface"},{"type":"address","name":"tokenOut","internalType":"contract TokenInterface"},{"type":"uint256","name":"totalAmountIn","internalType":"uint256"},{"type":"uint256","name":"minTotalAmountOut","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256","name":"totalAmountIn","internalType":"uint256"}],"name":"multihopBatchSwapExactOut","inputs":[{"type":"tuple[][]","name":"swapSequences","internalType":"struct ExchangeProxy.Swap[][]","components":[{"type":"address","name":"pool","internalType":"address"},{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"swapAmount","internalType":"uint256"},{"type":"uint256","name":"limitReturnAmount","internalType":"uint256"},{"type":"uint256","name":"maxPrice","internalType":"uint256"}]},{"type":"address","name":"tokenIn","internalType":"contract TokenInterface"},{"type":"address","name":"tokenOut","internalType":"contract TokenInterface"},{"type":"uint256","name":"maxTotalAmountIn","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"renounceOwnership","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setRegistry","inputs":[{"type":"address","name":"_registry","internalType":"address"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256","name":"totalAmountOut","internalType":"uint256"}],"name":"smartSwapExactIn","inputs":[{"type":"address","name":"tokenIn","internalType":"contract TokenInterface"},{"type":"address","name":"tokenOut","internalType":"contract TokenInterface"},{"type":"uint256","name":"totalAmountIn","internalType":"uint256"},{"type":"uint256","name":"minTotalAmountOut","internalType":"uint256"},{"type":"uint256","name":"nPools","internalType":"uint256"}]},{"type":"function","stateMutability":"payable","outputs":[{"type":"uint256","name":"totalAmountIn","internalType":"uint256"}],"name":"smartSwapExactOut","inputs":[{"type":"address","name":"tokenIn","internalType":"contract TokenInterface"},{"type":"address","name":"tokenOut","internalType":"contract TokenInterface"},{"type":"uint256","name":"totalAmountOut","internalType":"uint256"},{"type":"uint256","name":"maxTotalAmountIn","internalType":"uint256"},{"type":"uint256","name":"nPools","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"tuple[]","name":"swaps","internalType":"struct ExchangeProxy.Swap[]","components":[{"type":"address","name":"pool","internalType":"address"},{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"swapAmount","internalType":"uint256"},{"type":"uint256","name":"limitReturnAmount","internalType":"uint256"},{"type":"uint256","name":"maxPrice","internalType":"uint256"}]},{"type":"uint256","name":"totalOutput","internalType":"uint256"}],"name":"viewSplitExactIn","inputs":[{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"swapAmount","internalType":"uint256"},{"type":"uint256","name":"nPools","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"tuple[]","name":"swaps","internalType":"struct ExchangeProxy.Swap[]","components":[{"type":"address","name":"pool","internalType":"address"},{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"swapAmount","internalType":"uint256"},{"type":"uint256","name":"limitReturnAmount","internalType":"uint256"},{"type":"uint256","name":"maxPrice","internalType":"uint256"}]},{"type":"uint256","name":"totalOutput","internalType":"uint256"}],"name":"viewSplitExactOut","inputs":[{"type":"address","name":"tokenIn","internalType":"address"},{"type":"address","name":"tokenOut","internalType":"address"},{"type":"uint256","name":"swapAmount","internalType":"uint256"},{"type":"uint256","name":"nPools","internalType":"uint256"}]},{"type":"receive","stateMutability":"payable"}]

Contract Creation Code

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0x3e60cE358ee58748456d17ffF72941Ec92eE1DB8

contracts/proxies/ExchangeProxy.sol

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