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Contract

0x985BcA32293A7A496300a48081947321177a86FD

Overview

GLMR Balance

Moonbeam Chain LogoMoonbeam Chain LogoMoonbeam Chain Logo0 GLMR

GLMR Value

$0.00

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Transaction Hash
Block
From
To
Create Pair58984352024-04-08 8:42:36656 days ago1712565756IN
Beamswap: Amm Factory.V1
0 GLMR0.56549786153.00813237
Create Pair57746222024-03-21 21:22:00673 days ago1711056120IN
Beamswap: Amm Factory.V1
0 GLMR0.56076674151.72802206
Create Pair46301752023-10-12 6:33:54835 days ago1697092434IN
Beamswap: Amm Factory.V1
0 GLMR0.26055053126.56390676
Create Pair46172882023-10-10 11:11:18837 days ago1696936278IN
Beamswap: Amm Factory.V1
0 GLMR0.26054486126.56115175
Create Pair36736322023-05-30 14:29:24969 days ago1685456964IN
Beamswap: Amm Factory.V1
0 GLMR0.29134706141.56462028
Create Pair28895532023-02-06 8:18:481083 days ago1675671528IN
Beamswap: Amm Factory.V1
0 GLMR0.20786284101
Create Pair27972922023-01-24 7:34:301096 days ago1674545670IN
Beamswap: Amm Factory.V1
0 GLMR0.20786406101
Create Pair27972442023-01-24 7:24:541096 days ago1674545094IN
Beamswap: Amm Factory.V1
0 GLMR0.20786406101
Create Pair27971792023-01-24 7:11:421096 days ago1674544302IN
Beamswap: Amm Factory.V1
0 GLMR0.20786406101
Create Pair27971642023-01-24 7:08:421096 days ago1674544122IN
Beamswap: Amm Factory.V1
0 GLMR0.20786406101
Create Pair27971232023-01-24 7:00:181096 days ago1674543618IN
Beamswap: Amm Factory.V1
0 GLMR0.20786305101
Create Pair27971082023-01-24 6:57:061096 days ago1674543426IN
Beamswap: Amm Factory.V1
0 GLMR0.20786284101
Create Pair27971012023-01-24 6:55:421096 days ago1674543342IN
Beamswap: Amm Factory.V1
0 GLMR0.20786284101
Create Pair21741092022-10-28 7:07:181184 days ago1666940838IN
Beamswap: Amm Factory.V1
0 GLMR0.20758025101
Create Pair19720852022-09-29 16:11:181212 days ago1664467878IN
Beamswap: Amm Factory.V1
0 GLMR0.20758025101
Create Pair18310852022-09-09 11:55:481233 days ago1662724548IN
Beamswap: Amm Factory.V1
0 GLMR0.20758126101
Create Pair15869202022-08-05 8:25:181268 days ago1659687918IN
Beamswap: Amm Factory.V1
0 GLMR0.20758126101
Create Pair15869192022-08-05 8:25:061268 days ago1659687906IN
Beamswap: Amm Factory.V1
0 GLMR0.20758025101
Create Pair15869162022-08-05 8:24:241268 days ago1659687864IN
Beamswap: Amm Factory.V1
0 GLMR0.20758025101
Create Pair11832542022-06-06 16:46:001327 days ago1654533960IN
Beamswap: Amm Factory.V1
0 GLMR0.20758126101
Set Fee To8100362022-04-13 10:13:361382 days ago1649844816IN
Beamswap: Amm Factory.V1
0 GLMR0.0026099100
Set Fee To8053002022-04-12 18:04:301382 days ago1649786670IN
Beamswap: Amm Factory.V1
0 GLMR0.0026099100
Create Pair3906122022-02-11 19:36:001442 days ago1644608160IN
Beamswap: Amm Factory.V1
0 GLMR0.1606487100
Create Pair3906102022-02-11 19:35:361442 days ago1644608136IN
Beamswap: Amm Factory.V1
0 GLMR0.1893821100
Create Pair2000892022-01-15 13:46:121470 days ago1642254372IN
Beamswap: Amm Factory.V1
0 GLMR0.204595100
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Latest 25 internal transactions (View All)

Parent Transaction Hash Block From To
131574842025-10-30 15:52:1285 days ago1761839532
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
129989152025-10-17 13:13:4899 days ago1760706828
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
129980552025-10-17 11:29:0099 days ago1760700540
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
129893822025-10-16 18:08:3699 days ago1760638116
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
127307832025-09-25 11:25:54121 days ago1758799554
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
111912592025-06-06 19:14:00231 days ago1749237240
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
102199542025-03-29 1:58:48301 days ago1743213528
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
102121962025-03-28 12:52:18302 days ago1743166338
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
102117462025-03-28 12:06:42302 days ago1743163602
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
99431452025-03-09 12:34:18321 days ago1741523658
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
95509692025-02-09 21:02:06348 days ago1739134926
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
80040482024-10-22 22:26:48458 days ago1729636008
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
64825852024-06-29 22:36:18573 days ago1719700578
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
62386592024-05-26 11:34:36608 days ago1716723276
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
60755822024-05-03 11:06:24631 days ago1714734384
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
60706582024-05-02 18:29:12631 days ago1714674552
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
58984352024-04-08 8:42:36656 days ago1712565756
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
58180672024-03-28 0:39:36667 days ago1711586376
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
58165452024-03-27 19:30:18667 days ago1711567818
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
58159342024-03-27 17:24:24667 days ago1711560264
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
58128022024-03-27 6:47:18668 days ago1711522038
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
57883142024-03-23 19:45:30671 days ago1711223130
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
57876202024-03-23 17:23:06671 days ago1711214586
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
57860092024-03-23 11:56:36672 days ago1711194996
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
57844452024-03-23 6:40:12672 days ago1711176012
Beamswap: Amm Factory.V1
 Contract Creation0 GLMR
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Contract Source Code Verified (Exact Match)

Contract Name:
BeamSwapFactory

Compiler Version
v0.5.16+commit.9c3226ce

Optimization Enabled:
Yes with 1000 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at moonbeam.moonscan.io on 2022-01-16
*/

// Sources flattened with hardhat v2.7.1 https://hardhat.org

// File contracts/uniswapv2/interfaces/IBeamSwapFactory.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

interface IBeamSwapFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);

    function feeTo() external view returns (address);
    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint256) external view returns (address pair);
    function allPairsLength() external view returns (uint256);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}


// File contracts/uniswapv2/interfaces/IBeamSwapPair.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

interface IBeamSwapPair {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address owner) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint256);

    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function price0CumulativeLast() external view returns (uint256);
    function price1CumulativeLast() external view returns (uint256);
    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);
    function burn(address to) external returns (uint256 amount0, uint256 amount1);
    function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;
}


// File contracts/uniswapv2/interfaces/IBeamSwapERC20.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

interface IBeamSwapERC20 {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);
    function symbol() external pure returns (string memory);
    function decimals() external pure returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address owner) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external pure returns (bytes32);
    function nonces(address owner) external view returns (uint256);

    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;
}


// File contracts/uniswapv2/libraries/SafeMath.sol

pragma solidity =0.5.16;

// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

library SafeMath {
    function add(uint x, uint y) internal pure returns (uint z) {
        require((z = x + y) >= x, 'ds-math-add-overflow');
    }

    function sub(uint x, uint y) internal pure returns (uint z) {
        require((z = x - y) <= x, 'ds-math-sub-underflow');
    }

    function mul(uint x, uint y) internal pure returns (uint z) {
        require(y == 0 || (z = x * y) / y == x, 'ds-math-mul-overflow');
    }
}


// File contracts/uniswapv2/BeamSwapERC20.sol

pragma solidity =0.5.16;
contract BeamSwapERC20 is IBeamSwapERC20 {
    using SafeMath for uint256;

    string public constant name = 'BeamSwap LPs';
    string public constant symbol = 'BEAM-LP';
    uint8 public constant decimals = 18;
    uint256  public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

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

    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    constructor() public {
        uint256 chainId;
        assembly {
            chainId := chainid
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
                keccak256(bytes(name)),
                keccak256(bytes('1')),
                chainId,
                address(this)
            )
        );
    }

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

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

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

    function _transfer(address from, address to, uint256 value) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint256 value) external returns (bool) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

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


// File contracts/uniswapv2/libraries/Math.sol

pragma solidity =0.5.16;

// a library for performing various math operations

library Math {
    function min(uint x, uint y) internal pure returns (uint z) {
        z = x < y ? x : y;
    }

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


// File contracts/uniswapv2/libraries/UQ112x112.sol

pragma solidity =0.5.16;

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))

// range: [0, 2**112 - 1]
// resolution: 1 / 2**112

library UQ112x112 {
    uint224 constant Q112 = 2**112;

    // encode a uint112 as a UQ112x112
    function encode(uint112 y) internal pure returns (uint224 z) {
        z = uint224(y) * Q112; // never overflows
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
        z = x / uint224(y);
    }
}


// File contracts/uniswapv2/interfaces/IERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.5.0;

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address owner) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);
    function transfer(address to, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}


// File contracts/uniswapv2/interfaces/IBeamSwapCallee.sol

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

interface IBeamSwapCallee {
    function BeamSwapCall(address sender, uint amount0, uint amount1, bytes calldata data) external;
}


// File contracts/uniswapv2/BeamSwapPair.sol

pragma solidity =0.5.16;
contract BeamSwapPair is IBeamSwapPair, BeamSwapERC20 {
    using SafeMath for uint256;
    using UQ112x112 for uint224;

    uint256 public constant MINIMUM_LIQUIDITY = 10**3;
    bytes4 private constant SELECTOR =
        bytes4(keccak256(bytes("transfer(address,uint256)")));

    address public factory;
    address public token0;
    address public token1;

    uint112 private reserve0; // uses single storage slot, accessible via getReserves
    uint112 private reserve1; // uses single storage slot, accessible via getReserves
    uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves

    uint256 public price0CumulativeLast;
    uint256 public price1CumulativeLast;
    uint256 public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event

    uint256 private unlocked = 1;
    modifier lock() {
        require(unlocked == 1, "BeamSwap: LOCKED");
        unlocked = 0;
        _;
        unlocked = 1;
    }

    function getReserves()
        public
        view
        returns (
            uint112 _reserve0,
            uint112 _reserve1,
            uint32 _blockTimestampLast
        )
    {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _blockTimestampLast = blockTimestampLast;
    }

    function _safeTransfer(
        address token,
        address to,
        uint256 value
    ) private {
        (bool success, bytes memory data) = token.call(
            abi.encodeWithSelector(SELECTOR, to, value)
        );
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            "BeamSwap: TRANSFER_FAILED"
        );
    }

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(
        address indexed sender,
        uint256 amount0,
        uint256 amount1,
        address indexed to
    );
    event Swap(
        address indexed sender,
        uint256 amount0In,
        uint256 amount1In,
        uint256 amount0Out,
        uint256 amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    constructor() public {
        factory = msg.sender;
    }

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

    // update reserves and, on the first call per block, price accumulators
    function _update(
        uint256 balance0,
        uint256 balance1,
        uint112 _reserve0,
        uint112 _reserve1
    ) private {
        require(
            balance0 <= uint112(-1) && balance1 <= uint112(-1),
            "BeamSwap: OVERFLOW"
        );
        uint32 blockTimestamp = uint32(block.timestamp % 2**32);
        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
            // * never overflows, and + overflow is desired
            price0CumulativeLast +=
                uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) *
                timeElapsed;
            price1CumulativeLast +=
                uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) *
                timeElapsed;
        }
        reserve0 = uint112(balance0);
        reserve1 = uint112(balance1);
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }

    // if fee is on, mint liquidity equivalent to 1/6th of the growth in sqrt(k)
    function _mintFee(uint112 _reserve0, uint112 _reserve1)
        private
        returns (bool feeOn)
    {
        address feeTo = IBeamSwapFactory(factory).feeTo();
        feeOn = feeTo != address(0);
        uint256 _kLast = kLast; // gas savings
        if (feeOn) {
            if (_kLast != 0) {
                uint256 rootK = Math.sqrt(uint256(_reserve0).mul(_reserve1));
                uint256 rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint256 numerator = totalSupply.mul(rootK.sub(rootKLast));
                    uint256 denominator = (rootK.mul(1307692308) / 1000000000).add(rootKLast);
                    uint256 liquidity = numerator / denominator;
                    if (liquidity > 0) _mint(feeTo, liquidity);
                }
            }
        } else if (_kLast != 0) {
            kLast = 0;
        }
    }

    // this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock returns (uint256 liquidity) {
        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
        uint256 balance0 = IERC20(token0).balanceOf(address(this));
        uint256 balance1 = IERC20(token1).balanceOf(address(this));
        uint256 amount0 = balance0.sub(_reserve0);
        uint256 amount1 = balance1.sub(_reserve1);

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
            _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min(
                amount0.mul(_totalSupply) / _reserve0,
                amount1.mul(_totalSupply) / _reserve1
            );
        }
        require(liquidity > 0, "BeamSwap: INSUFFICIENT_LIQUIDITY_MINTED");
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Mint(msg.sender, amount0, amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function burn(address to)
        external
        lock
        returns (uint256 amount0, uint256 amount1)
    {
        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        uint256 balance0 = IERC20(_token0).balanceOf(address(this));
        uint256 balance1 = IERC20(_token1).balanceOf(address(this));
        uint256 liquidity = balanceOf[address(this)];

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
        require(
            amount0 > 0 && amount1 > 0,
            "BeamSwap: INSUFFICIENT_LIQUIDITY_BURNED"
        );
        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date
        emit Burn(msg.sender, amount0, amount1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external lock {
        require(
            amount0Out > 0 || amount1Out > 0,
            "BeamSwap: INSUFFICIENT_OUTPUT_AMOUNT"
        );
        (uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
        require(
            amount0Out < _reserve0 && amount1Out < _reserve1,
            "BeamSwap: INSUFFICIENT_LIQUIDITY"
        );

        uint256 balance0;
        uint256 balance1;
        {
            // scope for _token{0,1}, avoids stack too deep errors
            address _token0 = token0;
            address _token1 = token1;
            require(to != _token0 && to != _token1, "BeamSwap: INVALID_TO");
            if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
            if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
            if (data.length > 0)
                IBeamSwapCallee(to).BeamSwapCall(
                    msg.sender,
                    amount0Out,
                    amount1Out,
                    data
                );
            balance0 = IERC20(_token0).balanceOf(address(this));
            balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint256 amount0In = balance0 > _reserve0 - amount0Out
            ? balance0 - (_reserve0 - amount0Out)
            : 0;
        uint256 amount1In = balance1 > _reserve1 - amount1Out
            ? balance1 - (_reserve1 - amount1Out)
            : 0;
        require(
            amount0In > 0 || amount1In > 0,
            "BeamSwap: INSUFFICIENT_INPUT_AMOUNT"
        );
        {
            // scope for reserve{0,1}Adjusted, avoids stack too deep errors
            uint256 balance0Adjusted = balance0.mul(1000).sub(amount0In.mul(3));
            uint256 balance1Adjusted = balance1.mul(1000).sub(amount1In.mul(3));
            require(
                balance0Adjusted.mul(balance1Adjusted) >=
                    uint256(_reserve0).mul(_reserve1).mul(1000**2),
                "Beamswap: K"
            );
        }

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    // force balances to match reserves
    function skim(address to) external lock {
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        _safeTransfer(
            _token0,
            to,
            IERC20(_token0).balanceOf(address(this)).sub(reserve0)
        );
        _safeTransfer(
            _token1,
            to,
            IERC20(_token1).balanceOf(address(this)).sub(reserve1)
        );
    }

    // force reserves to match balances
    function sync() external lock {
        _update(
            IERC20(token0).balanceOf(address(this)),
            IERC20(token1).balanceOf(address(this)),
            reserve0,
            reserve1
        );
    }
}


// File contracts/uniswapv2/BeamSwapFactory.sol

pragma solidity =0.5.16;
contract BeamSwapFactory is IBeamSwapFactory {
    bytes32 public constant INIT_CODE_PAIR_HASH =
        keccak256(abi.encodePacked(type(BeamSwapPair).creationCode));

    address public feeTo;
    address public feeToSetter;

    mapping(address => mapping(address => address)) public getPair;
    address[] public allPairs;

    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

    constructor(address _feeToSetter) public {
        feeToSetter = _feeToSetter;
    }

    function allPairsLength() external view returns (uint256) {
        return allPairs.length;
    }

    function createPair(address tokenA, address tokenB)
        external
        returns (address pair)
    {
        require(tokenA != tokenB, "BeamSwap: IDENTICAL_ADDRESSES");
        (address token0, address token1) = tokenA < tokenB
            ? (tokenA, tokenB)
            : (tokenB, tokenA);
        require(token0 != address(0), "BeamSwap: ZERO_ADDRESS");
        require(getPair[token0][token1] == address(0), "BeamSwap: PAIR_EXISTS"); // single check is sufficient
        bytes memory bytecode = type(BeamSwapPair).creationCode;
        bytes32 salt = keccak256(abi.encodePacked(token0, token1));
        assembly {
            pair := create2(0, add(bytecode, 32), mload(bytecode), salt)
        }
        IBeamSwapPair(pair).initialize(token0, token1);
        getPair[token0][token1] = pair;
        getPair[token1][token0] = pair; // populate mapping in the reverse direction
        allPairs.push(pair);
        emit PairCreated(token0, token1, pair, allPairs.length);
    }

    function setFeeTo(address _feeTo) external {
        require(msg.sender == feeToSetter, "BeamSwap: FORBIDDEN");
        feeTo = _feeTo;
    }

    function setFeeToSetter(address _feeToSetter) external {
        require(msg.sender == feeToSetter, "BeamSwap: FORBIDDEN");
        feeToSetter = _feeToSetter;
    }
}

Contract Security Audit

Contract ABI

API
[{"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token0","type":"address"},{"indexed":true,"internalType":"address","name":"token1","type":"address"},{"indexed":false,"internalType":"address","name":"pair","type":"address"},{"indexed":false,"internalType":"uint256","name":"","type":"uint256"}],"name":"PairCreated","type":"event"},{"constant":true,"inputs":[],"name":"INIT_CODE_PAIR_HASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"allPairs","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"allPairsLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"}],"name":"createPair","outputs":[{"internalType":"address","name":"pair","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"feeTo","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"feeToSetter","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"getPair","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_feeTo","type":"address"}],"name":"setFeeTo","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"name":"setFeeToSetter","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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

0000000000000000000000000a68f81fe8c23cf19fd0f90be3734f68ff2ef451

-----Decoded View---------------
Arg [0] : _feeToSetter (address): 0x0a68f81Fe8c23cF19FD0f90be3734F68FF2EF451

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000a68f81fe8c23cf19fd0f90be3734f68ff2ef451


Deployed Bytecode Sourcemap

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Swarm Source

bzzr://5178d0a5af96eed2982527bb3afccbd385d59ef74199854ebea21f23e67f9db0

Block Transaction Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.