Contract 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 12

 
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0xa942af8ee49e90f0bc379ac170d2ee736ed06b27a0955a08a95680aa113adbb4Approve1161831952024-02-15 2:46:076 days 20 hrs ago0x39260b9be6b55b18505c6dd098d7fe0bb8622101 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000342038170.095594368
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0x970d05775e8da83f17812ecb5fb170a3dd0168aef7bd2097c57e03253767d01fApprove1157099052024-02-04 3:49:4717 days 19 hrs ago0x979180f9e41b85f8e91f0de461f98affa879621d IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000212650360.007409688
0x89b15b50eb8a592a271b066ad552947b0dd759e198cd9e13a85227a19d06b815Approve1157098852024-02-04 3:49:0717 days 19 hrs ago0x979180f9e41b85f8e91f0de461f98affa879621d IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000207751990.007837508
0x9fe5d660d26ab70c3d6b4b9a5f3cd305b3014be9d28e349f4c484e7eed367a31Approve1152242322024-01-23 22:00:4129 days 55 mins ago0xdb09f0241ca6ce4a072e785b0ab8bf815e157048 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000230095580.00383352
0x712e243baa927d7f25b20cc309d0d0d34a75dd8640d7f4c9499d4fe1a882a3f2Approve1151741032024-01-22 18:09:4330 days 4 hrs ago0x68acb2051b73c2342be78cd1a7e5ca44483d10c5 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000350592950.003713519
0x870d23a9a41923a9dfa4e3a8d9487fd35096bef72db6e0f0ea90c740cba8c154Swap1151380392024-01-21 22:07:3531 days 48 mins ago0x27b65f269e3eee4c066242b767b3479bede5b3c2 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000254734710.003651163
0x9159badaaff6f7e5b982e2d9e47567d8d619f86fce2b0c21892435e8c7b10087Swap1151376032024-01-21 21:53:0331 days 1 hr ago0x27b65f269e3eee4c066242b767b3479bede5b3c2 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000275059540.003107858
0x482266b9d3b955d42f458dbc2918170fed834f22e4ccc59178fd53910e43a1b7Swap1151373422024-01-21 21:44:2131 days 1 hr ago0x27b65f269e3eee4c066242b767b3479bede5b3c2 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000264432250.002750118
0x9e042ec31a7f5a1ea431441aed4c0d77a02489aaacebde4e49ecb27a1fdf0b6cApprove1151372862024-01-21 21:42:2931 days 1 hr ago0x27b65f269e3eee4c066242b767b3479bede5b3c2 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.000021906710.002456826
0xee46f2263d519831d977524ce14d91683b6b32ceab1a5b81859c90441b312a68Approve1151372382024-01-21 21:40:5331 days 1 hr ago0x27b65f269e3eee4c066242b767b3479bede5b3c2 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000219574550.002419137
0x2b927be9ebaff791959fd93273f4bd97f29a02a2b085cebc07f85352310c9a23Approve1151371222024-01-21 21:37:0131 days 1 hr ago0x27b65f269e3eee4c066242b767b3479bede5b3c2 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000249939180.002588043
0x656e712cb4f37d57ead94b278143246146f64776d1545a5eaf7062731996d2afApprove1149144692024-01-16 17:55:1536 days 5 hrs ago0xe9465c512b4b622937e5bceb50ad6dfcc5732cf6 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000660447740.102269493
0xa597408af2c33edf4ff6a8b0d46482ba284cc4136cd0f426adb7000b31b97639Approve1145582572024-01-08 12:01:3144 days 10 hrs ago0xcda58658267ffc3c13f4e8c1cb5b7765386ec7ef IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000263271520.01020075
0xe557cb7f3761b736e6e404ad28fbaa193c34061bcfe9c4bdae81a0c4d14cf014Approve1145502192024-01-08 7:33:3544 days 15 hrs ago0x2ff348d8bf975e7ceae7fe5af273ff58f28519ce IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000256567910.006193033
0x51a52e8f6d532b811276956f3f3e5f2da0682049732e16916866f9dd421222d1Approve1145502162024-01-08 7:33:2944 days 15 hrs ago0x2ff348d8bf975e7ceae7fe5af273ff58f28519ce IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.000026586440.006193033
0x04e913d0ccdda038d6c4233506023e66fa286cfc5d554751719477ff56fc27f2Approve1144913252024-01-06 22:50:2746 days 5 mins ago0x146695f336d600e9fbc78185aa0e64104fc191f2 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000318084870.00616781
0x6a15ddebcb23dc7177baafd9a365b86d1796c8e8bedef5c9379cd99bc9c7659cApprove1144904992024-01-06 22:22:5546 days 32 mins ago0x146695f336d600e9fbc78185aa0e64104fc191f2 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000414069640.006916615
0x86a98296b0d39397cf8b8b5b35b2e41a4358a3c73f18dbd63bbfc58a89a2351cClaim Fees1144868392024-01-06 20:20:5546 days 2 hrs ago0x8c896f071a854f4ba2b2011e89c9e250f2079b9c IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000323807210.00809444
0xe6c6dec63a55084ca766ef2f27966201b4a9f8abc9402344262f2977e2bb3c7eApprove1144867662024-01-06 20:18:2946 days 2 hrs ago0x8c896f071a854f4ba2b2011e89c9e250f2079b9c IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000434793250.007743799
0x6d9760eb8cdb5d2f0aee14886f3ad7245123d8454e38531e569a2f7629839f8dApprove1144221822024-01-05 8:25:4147 days 14 hrs ago0xa5f04fd785a5e4897f4136ecd0ef4dc45723bc8e IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000203385730.007638124
0xca9cba16b111e714f207babd70b13a07a74b1d4223826478dd6dc6d6197d7e74Approve1136761812023-12-19 1:58:5964 days 20 hrs ago0xd0193d8f3888d51ab548c6c34e8001684c1915e9 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0001041304970.103434591
0xa83ebe06253e24825aae69ab58435ddb5f3826ec9826a279ebe442d18960b6f6Approve1136761532023-12-19 1:58:0364 days 20 hrs ago0xd0193d8f3888d51ab548c6c34e8001684c1915e9 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.000094725220.106884623
0x907a96211b11bd07ec1ed793e89841a6355ad47a93243f1075ec95f45d3f8632Approve1131846712023-12-07 16:55:1976 days 6 hrs ago0x4c1bedf9efa644edb62f9743b8fab4defff0ce7c IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0001189818350.023376444
0xa0b8437b11ac91edc946a9ab9c73d4cbcb98044a0ec1bed099e9e4c21d3de1e3Approve1122695252023-11-16 12:30:2797 days 10 hrs ago0xc32259c0082e203a5895196cf7e7b5d60faa9f05 IN  0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH0.0000614823560.021788563
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Latest 25 internal transaction
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0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x497e7f08f153fb58f522032b408d7dafc29fcac8 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0xce60cbbea05fafdad18f66f299e19ff048567672 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0xce60cbbea05fafdad18f66f299e19ff048567672 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0xce60cbbea05fafdad18f66f299e19ff048567672 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 Wrapped USDR: wUSDR Token0 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago Velodrome Finance: Router 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago Velodrome Finance: Router 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 Wrapped USDR: wUSDR Token0 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 Velodrome Finance: Pair Factory0 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 Wrapped USDR: wUSDR Token0 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 Wrapped USDR: wUSDR Token0 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 Velodrome Finance: Pair Factory0 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago Velodrome Finance: Router 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 Velodrome Finance: Pair Factory0 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago Velodrome Finance: Router 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d38 Velodrome Finance: Pair Factory0 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0xce60cbbea05fafdad18f66f299e19ff048567672 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x484041112536b036e85f29d7a8dfd3b0d208652b13f1a954919cddbbeecb51d61075562912023-07-30 10:02:39206 days 12 hrs ago 0xce60cbbea05fafdad18f66f299e19ff048567672 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x2115959b4b5ea2c88e273326dbce4c98adac0e7cf63d2f65ca6b296681ba7d981075534072023-07-30 8:26:31206 days 14 hrs ago 0x497e7f08f153fb58f522032b408d7dafc29fcac8 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x2115959b4b5ea2c88e273326dbce4c98adac0e7cf63d2f65ca6b296681ba7d981075534072023-07-30 8:26:31206 days 14 hrs ago 0xce60cbbea05fafdad18f66f299e19ff048567672 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
0x2115959b4b5ea2c88e273326dbce4c98adac0e7cf63d2f65ca6b296681ba7d981075534072023-07-30 8:26:31206 days 14 hrs ago 0xce60cbbea05fafdad18f66f299e19ff048567672 0x48dce63bacf1c7c839cfa7d4f871ad17c0d30d380 ETH
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x335bd4ffa921160fc86ce3843f80a9941e7456c6
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
Pair

Compiler Version
v0.8.13+commit.abaa5c0e

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 8 : Pair.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

import 'contracts/libraries/Math.sol';
import 'contracts/interfaces/IERC20.sol';
import 'contracts/interfaces/IPair.sol';
import 'contracts/interfaces/IPairCallee.sol';
import 'contracts/factories/PairFactory.sol';
import 'contracts/PairFees.sol';

// The base pair of pools, either stable or volatile
contract Pair is IPair {

    string public name;
    string public symbol;
    uint8 public constant decimals = 18;

    // Used to denote stable or volatile pair, not immutable since construction happens in the initialize method for CREATE2 deterministic addresses
    bool public immutable stable;

    uint public totalSupply = 0;

    mapping(address => mapping (address => uint)) public allowance;
    mapping(address => uint) public balanceOf;

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

    uint internal constant MINIMUM_LIQUIDITY = 10**3;

    address public immutable token0;
    address public immutable token1;
    address public immutable fees;
    address immutable factory;

    // Structure to capture time period obervations every 30 minutes, used for local oracles
    struct Observation {
        uint timestamp;
        uint reserve0Cumulative;
        uint reserve1Cumulative;
    }

    // Capture oracle reading every 30 minutes
    uint constant periodSize = 1800;

    Observation[] public observations;

    uint internal immutable decimals0;
    uint internal immutable decimals1;

    uint public reserve0;
    uint public reserve1;
    uint public blockTimestampLast;

    uint public reserve0CumulativeLast;
    uint public reserve1CumulativeLast;

    // index0 and index1 are used to accumulate fees, this is split out from normal trades to keep the swap "clean"
    // this further allows LP holders to easily claim fees for tokens they have/staked
    uint public index0 = 0;
    uint public index1 = 0;

    // position assigned to each LP to track their current index0 & index1 vs the global position
    mapping(address => uint) public supplyIndex0;
    mapping(address => uint) public supplyIndex1;

    // tracks the amount of unclaimed, but claimable tokens off of fees for token0 and token1
    mapping(address => uint) public claimable0;
    mapping(address => uint) public claimable1;

    event Fees(address indexed sender, uint amount0, uint amount1);
    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint reserve0, uint reserve1);
    event Claim(address indexed sender, address indexed recipient, uint amount0, uint amount1);

    event Transfer(address indexed from, address indexed to, uint amount);
    event Approval(address indexed owner, address indexed spender, uint amount);

    constructor() {
        factory = msg.sender;
        (address _token0, address _token1, bool _stable) = PairFactory(msg.sender).getInitializable();
        (token0, token1, stable) = (_token0, _token1, _stable);
        fees = address(new PairFees(_token0, _token1));
        if (_stable) {
            name = string(abi.encodePacked("StableV1 AMM - ", IERC20(_token0).symbol(), "/", IERC20(_token1).symbol()));
            symbol = string(abi.encodePacked("sAMM-", IERC20(_token0).symbol(), "/", IERC20(_token1).symbol()));
        } else {
            name = string(abi.encodePacked("VolatileV1 AMM - ", IERC20(_token0).symbol(), "/", IERC20(_token1).symbol()));
            symbol = string(abi.encodePacked("vAMM-", IERC20(_token0).symbol(), "/", IERC20(_token1).symbol()));
        }

        decimals0 = 10**IERC20(_token0).decimals();
        decimals1 = 10**IERC20(_token1).decimals();

        observations.push(Observation(block.timestamp, 0, 0));
    }

    // simple re-entrancy check
    uint internal _unlocked = 1;
    modifier lock() {
        require(_unlocked == 1);
        _unlocked = 2;
        _;
        _unlocked = 1;
    }

    function observationLength() external view returns (uint) {
        return observations.length;
    }

    function lastObservation() public view returns (Observation memory) {
        return observations[observations.length-1];
    }

    function metadata() external view returns (uint dec0, uint dec1, uint r0, uint r1, bool st, address t0, address t1) {
        return (decimals0, decimals1, reserve0, reserve1, stable, token0, token1);
    }

    function tokens() external view returns (address, address) {
        return (token0, token1);
    }

    // claim accumulated but unclaimed fees (viewable via claimable0 and claimable1)
    function claimFees() external returns (uint claimed0, uint claimed1) {
        _updateFor(msg.sender);

        claimed0 = claimable0[msg.sender];
        claimed1 = claimable1[msg.sender];

        if (claimed0 > 0 || claimed1 > 0) {
            claimable0[msg.sender] = 0;
            claimable1[msg.sender] = 0;

            PairFees(fees).claimFeesFor(msg.sender, claimed0, claimed1);

            emit Claim(msg.sender, msg.sender, claimed0, claimed1);
        }
    }

    // Accrue fees on token0
    function _update0(uint amount) internal {
        _safeTransfer(token0, fees, amount); // transfer the fees out to PairFees
        uint256 _ratio = amount * 1e18 / totalSupply; // 1e18 adjustment is removed during claim
        if (_ratio > 0) {
            index0 += _ratio;
        }
        emit Fees(msg.sender, amount, 0);
    }

    // Accrue fees on token1
    function _update1(uint amount) internal {
        _safeTransfer(token1, fees, amount);
        uint256 _ratio = amount * 1e18 / totalSupply;
        if (_ratio > 0) {
            index1 += _ratio;
        }
        emit Fees(msg.sender, 0, amount);
    }

    // this function MUST be called on any balance changes, otherwise can be used to infinitely claim fees
    // Fees are segregated from core funds, so fees can never put liquidity at risk
    function _updateFor(address recipient) internal {
        uint _supplied = balanceOf[recipient]; // get LP balance of `recipient`
        if (_supplied > 0) {
            uint _supplyIndex0 = supplyIndex0[recipient]; // get last adjusted index0 for recipient
            uint _supplyIndex1 = supplyIndex1[recipient];
            uint _index0 = index0; // get global index0 for accumulated fees
            uint _index1 = index1;
            supplyIndex0[recipient] = _index0; // update user current position to global position
            supplyIndex1[recipient] = _index1;
            uint _delta0 = _index0 - _supplyIndex0; // see if there is any difference that need to be accrued
            uint _delta1 = _index1 - _supplyIndex1;
            if (_delta0 > 0) {
                uint _share = _supplied * _delta0 / 1e18; // add accrued difference for each supplied token
                claimable0[recipient] += _share;
            }
            if (_delta1 > 0) {
                uint _share = _supplied * _delta1 / 1e18;
                claimable1[recipient] += _share;
            }
        } else {
            supplyIndex0[recipient] = index0; // new users are set to the default global state
            supplyIndex1[recipient] = index1;
        }
    }

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

    // update reserves and, on the first call per block, price accumulators
    function _update(uint balance0, uint balance1, uint _reserve0, uint _reserve1) internal {
        uint blockTimestamp = block.timestamp;
        uint timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
            reserve0CumulativeLast += _reserve0 * timeElapsed;
            reserve1CumulativeLast += _reserve1 * timeElapsed;
        }

        Observation memory _point = lastObservation();
        timeElapsed = blockTimestamp - _point.timestamp; // compare the last observation with current timestamp, if greater than 30 minutes, record a new event
        if (timeElapsed > periodSize) {
            observations.push(Observation(blockTimestamp, reserve0CumulativeLast, reserve1CumulativeLast));
        }
        reserve0 = balance0;
        reserve1 = balance1;
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }

    // produces the cumulative price using counterfactuals to save gas and avoid a call to sync.
    function currentCumulativePrices() public view returns (uint reserve0Cumulative, uint reserve1Cumulative, uint blockTimestamp) {
        blockTimestamp = block.timestamp;
        reserve0Cumulative = reserve0CumulativeLast;
        reserve1Cumulative = reserve1CumulativeLast;

        // if time has elapsed since the last update on the pair, mock the accumulated price values
        (uint _reserve0, uint _reserve1, uint _blockTimestampLast) = getReserves();
        if (_blockTimestampLast != blockTimestamp) {
            // subtraction overflow is desired
            uint timeElapsed = blockTimestamp - _blockTimestampLast;
            reserve0Cumulative += _reserve0 * timeElapsed;
            reserve1Cumulative += _reserve1 * timeElapsed;
        }
    }

    // gives the current twap price measured from amountIn * tokenIn gives amountOut
    function current(address tokenIn, uint amountIn) external view returns (uint amountOut) {
        Observation memory _observation = lastObservation();
        (uint reserve0Cumulative, uint reserve1Cumulative,) = currentCumulativePrices();
        if (block.timestamp == _observation.timestamp) {
            _observation = observations[observations.length-2];
        }

        uint timeElapsed = block.timestamp - _observation.timestamp;
        uint _reserve0 = (reserve0Cumulative - _observation.reserve0Cumulative) / timeElapsed;
        uint _reserve1 = (reserve1Cumulative - _observation.reserve1Cumulative) / timeElapsed;
        amountOut = _getAmountOut(amountIn, tokenIn, _reserve0, _reserve1);
    }

    // as per `current`, however allows user configured granularity, up to the full window size
    function quote(address tokenIn, uint amountIn, uint granularity) external view returns (uint amountOut) {
        uint [] memory _prices = sample(tokenIn, amountIn, granularity, 1);
        uint priceAverageCumulative;
        for (uint i = 0; i < _prices.length; i++) {
            priceAverageCumulative += _prices[i];
        }
        return priceAverageCumulative / granularity;
    }

    // returns a memory set of twap prices
    function prices(address tokenIn, uint amountIn, uint points) external view returns (uint[] memory) {
        return sample(tokenIn, amountIn, points, 1);
    }

    function sample(address tokenIn, uint amountIn, uint points, uint window) public view returns (uint[] memory) {
        uint[] memory _prices = new uint[](points);

        uint length = observations.length-1;
        uint i = length - (points * window);
        uint nextIndex = 0;
        uint index = 0;

        for (; i < length; i+=window) {
            nextIndex = i + window;
            uint timeElapsed = observations[nextIndex].timestamp - observations[i].timestamp;
            uint _reserve0 = (observations[nextIndex].reserve0Cumulative - observations[i].reserve0Cumulative) / timeElapsed;
            uint _reserve1 = (observations[nextIndex].reserve1Cumulative - observations[i].reserve1Cumulative) / timeElapsed;
            _prices[index] = _getAmountOut(amountIn, tokenIn, _reserve0, _reserve1);
            // index < length; length cannot overflow
            unchecked {
                index = index + 1;
            }
        }
        return _prices;
    }

    // this low-level function should be called by addLiquidity functions in Router.sol, which performs important safety checks
    // standard uniswap v2 implementation
    function mint(address to) external lock returns (uint liquidity) {
        (uint _reserve0, uint _reserve1) = (reserve0, reserve1);
        uint _balance0 = IERC20(token0).balanceOf(address(this));
        uint _balance1 = IERC20(token1).balanceOf(address(this));
        uint _amount0 = _balance0 - _reserve0;
        uint _amount1 = _balance1 - _reserve1;

        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            liquidity = Math.sqrt(_amount0 * _amount1) - MINIMUM_LIQUIDITY;
            _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min(_amount0 * _totalSupply / _reserve0, _amount1 * _totalSupply / _reserve1);
        }
        require(liquidity > 0, 'ILM'); // Pair: INSUFFICIENT_LIQUIDITY_MINTED
        _mint(to, liquidity);

        _update(_balance0, _balance1, _reserve0, _reserve1);
        emit Mint(msg.sender, _amount0, _amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    // standard uniswap v2 implementation
    function burn(address to) external lock returns (uint amount0, uint amount1) {
        (uint _reserve0, uint _reserve1) = (reserve0, reserve1);
        (address _token0, address _token1) = (token0, token1);
        uint _balance0 = IERC20(_token0).balanceOf(address(this));
        uint _balance1 = IERC20(_token1).balanceOf(address(this));
        uint _liquidity = balanceOf[address(this)];

        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = _liquidity * _balance0 / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = _liquidity * _balance1 / _totalSupply; // using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, 'ILB'); // Pair: 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);
        emit Burn(msg.sender, amount0, amount1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external lock {
        require(!PairFactory(factory).isPaused());
        require(amount0Out > 0 || amount1Out > 0, 'IOA'); // Pair: INSUFFICIENT_OUTPUT_AMOUNT
        (uint _reserve0, uint _reserve1) =  (reserve0, reserve1);
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'IL'); // Pair: INSUFFICIENT_LIQUIDITY

        uint _balance0;
        uint _balance1;
        { // scope for _token{0,1}, avoids stack too deep errors
        (address _token0, address _token1) = (token0, token1);
        require(to != _token0 && to != _token1, 'IT'); // Pair: 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) IPairCallee(to).hook(msg.sender, amount0Out, amount1Out, data); // callback, used for flash loans
        _balance0 = IERC20(_token0).balanceOf(address(this));
        _balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint amount0In = _balance0 > _reserve0 - amount0Out ? _balance0 - (_reserve0 - amount0Out) : 0;
        uint amount1In = _balance1 > _reserve1 - amount1Out ? _balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, 'IIA'); // Pair: INSUFFICIENT_INPUT_AMOUNT
        { // scope for reserve{0,1}Adjusted, avoids stack too deep errors
        (address _token0, address _token1) = (token0, token1);
        if (amount0In > 0) _update0(amount0In * PairFactory(factory).getFee(stable) / 10000); // accrue fees for token0 and move them out of pool
        if (amount1In > 0) _update1(amount1In * PairFactory(factory).getFee(stable) / 10000); // accrue fees for token1 and move them out of pool
        _balance0 = IERC20(_token0).balanceOf(address(this)); // since we removed tokens, we need to reconfirm balances, can also simply use previous balance - amountIn/ 10000, but doing balanceOf again as safety check
        _balance1 = IERC20(_token1).balanceOf(address(this));
        // The curve, either x3y+y3x for stable pools, or x*y for volatile pools
        require(_k(_balance0, _balance1) >= _k(_reserve0, _reserve1), 'K'); // Pair: 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, address _token1) = (token0, token1);
        _safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)) - (reserve0));
        _safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)) - (reserve1));
    }

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

    function _f(uint x0, uint y) internal pure returns (uint) {
        return x0*(y*y/1e18*y/1e18)/1e18+(x0*x0/1e18*x0/1e18)*y/1e18;
    }

    function _d(uint x0, uint y) internal pure returns (uint) {
        return 3*x0*(y*y/1e18)/1e18+(x0*x0/1e18*x0/1e18);
    }

    function _get_y(uint x0, uint xy, uint y) internal pure returns (uint) {
        for (uint i = 0; i < 255; i++) {
            uint y_prev = y;
            uint k = _f(x0, y);
            if (k < xy) {
                uint dy = (xy - k)*1e18/_d(x0, y);
                y = y + dy;
            } else {
                uint dy = (k - xy)*1e18/_d(x0, y);
                y = y - dy;
            }
            if (y > y_prev) {
                if (y - y_prev <= 1) {
                    return y;
                }
            } else {
                if (y_prev - y <= 1) {
                    return y;
                }
            }
        }
        return y;
    }

    function getAmountOut(uint amountIn, address tokenIn) external view returns (uint) {
        (uint _reserve0, uint _reserve1) = (reserve0, reserve1);
        amountIn -= amountIn * PairFactory(factory).getFee(stable) / 10000; // remove fee from amount received
        return _getAmountOut(amountIn, tokenIn, _reserve0, _reserve1);
    }

    function _getAmountOut(uint amountIn, address tokenIn, uint _reserve0, uint _reserve1) internal view returns (uint) {
        if (stable) {
            uint xy =  _k(_reserve0, _reserve1);
            _reserve0 = _reserve0 * 1e18 / decimals0;
            _reserve1 = _reserve1 * 1e18 / decimals1;
            (uint reserveA, uint reserveB) = tokenIn == token0 ? (_reserve0, _reserve1) : (_reserve1, _reserve0);
            amountIn = tokenIn == token0 ? amountIn * 1e18 / decimals0 : amountIn * 1e18 / decimals1;
            uint y = reserveB - _get_y(amountIn+reserveA, xy, reserveB);
            return y * (tokenIn == token0 ? decimals1 : decimals0) / 1e18;
        } else {
            (uint reserveA, uint reserveB) = tokenIn == token0 ? (_reserve0, _reserve1) : (_reserve1, _reserve0);
            return amountIn * reserveB / (reserveA + amountIn);
        }
    }

    function _k(uint x, uint y) internal view returns (uint) {
        if (stable) {
            uint _x = x * 1e18 / decimals0;
            uint _y = y * 1e18 / decimals1;
            uint _a = (_x * _y) / 1e18;
            uint _b = ((_x * _x) / 1e18 + (_y * _y) / 1e18);
            return _a * _b / 1e18;  // x3y+y3x >= k
        } else {
            return x * y; // xy >= k
        }
    }

    function _mint(address dst, uint amount) internal {
        _updateFor(dst); // balances must be updated on mint/burn/transfer
        totalSupply += amount;
        balanceOf[dst] += amount;
        emit Transfer(address(0), dst, amount);
    }

    function _burn(address dst, uint amount) internal {
        _updateFor(dst);
        totalSupply -= amount;
        balanceOf[dst] -= amount;
        emit Transfer(dst, address(0), amount);
    }

    function approve(address spender, uint amount) external returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
        require(deadline >= block.timestamp, 'Pair: EXPIRED');
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
                keccak256(bytes(name)),
                keccak256(bytes('1')),
                block.chainid,
                address(this)
            )
        );
        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, 'Pair: INVALID_SIGNATURE');
        allowance[owner][spender] = value;

        emit Approval(owner, spender, value);
    }

    function transfer(address dst, uint amount) external returns (bool) {
        _transferTokens(msg.sender, dst, amount);
        return true;
    }

    function transferFrom(address src, address dst, uint amount) external returns (bool) {
        address spender = msg.sender;
        uint spenderAllowance = allowance[src][spender];

        if (spender != src && spenderAllowance != type(uint).max) {
            uint newAllowance = spenderAllowance - amount;
            allowance[src][spender] = newAllowance;

            emit Approval(src, spender, newAllowance);
        }

        _transferTokens(src, dst, amount);
        return true;
    }

    function _transferTokens(address src, address dst, uint amount) internal {
        _updateFor(src); // update fee position for src
        _updateFor(dst); // update fee position for dst

        balanceOf[src] -= amount;
        balanceOf[dst] += amount;

        emit Transfer(src, dst, amount);
    }

    function _safeTransfer(address token,address to,uint256 value) internal {
        require(token.code.length > 0);
        (bool success, bytes memory data) =
        token.call(abi.encodeWithSelector(IERC20.transfer.selector, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))));
    }
}

File 2 of 8 : Math.sol
pragma solidity 0.8.13;

library Math {
    function max(uint a, uint b) internal pure returns (uint) {
        return a >= b ? a : b;
    }
    function min(uint a, uint b) internal pure returns (uint) {
        return a < b ? a : b;
    }
    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;
        }
    }
    function cbrt(uint256 n) internal pure returns (uint256) { unchecked {
        uint256 x = 0;
        for (uint256 y = 1 << 255; y > 0; y >>= 3) {
            x <<= 1;
            uint256 z = 3 * x * (x + 1) + 1;
            if (n / y >= z) {
                n -= y * z;
                x += 1;
            }
        }
        return x;
    }}
}

File 3 of 8 : IERC20.sol
pragma solidity 0.8.13;

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function transfer(address recipient, uint amount) external returns (bool);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function balanceOf(address) external view returns (uint);
    function transferFrom(address sender, address recipient, uint amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint);
    function approve(address spender, uint value) external returns (bool);

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

File 4 of 8 : IPair.sol
pragma solidity 0.8.13;

interface IPair {
    function metadata() external view returns (uint dec0, uint dec1, uint r0, uint r1, bool st, address t0, address t1);
    function claimFees() external returns (uint, uint);
    function tokens() external returns (address, address);
    function transferFrom(address src, address dst, uint amount) external returns (bool);
    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function burn(address to) external returns (uint amount0, uint amount1);
    function mint(address to) external returns (uint liquidity);
    function getReserves() external view returns (uint _reserve0, uint _reserve1, uint _blockTimestampLast);
    function getAmountOut(uint, address) external view returns (uint);
}

File 5 of 8 : IPairCallee.sol
pragma solidity 0.8.13;

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

File 6 of 8 : PairFactory.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

import 'contracts/interfaces/IPairFactory.sol';
import 'contracts/Pair.sol';

contract PairFactory is IPairFactory {

    bool public isPaused;
    address public pauser;
    address public pendingPauser;

    uint256 public stableFee;
    uint256 public volatileFee;
    uint256 public constant MAX_FEE = 5; // 0.05%
    address public feeManager;
    address public pendingFeeManager;

    mapping(address => mapping(address => mapping(bool => address))) public getPair;
    address[] public allPairs;
    mapping(address => bool) public isPair; // simplified check if its a pair, given that `stable` flag might not be available in peripherals

    address internal _temp0;
    address internal _temp1;
    bool internal _temp;

    event PairCreated(address indexed token0, address indexed token1, bool stable, address pair, uint);

    constructor() {
        pauser = msg.sender;
        isPaused = false;
        feeManager = msg.sender;
        stableFee = 2; // 0.02%
        volatileFee = 2;
    }

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

    function setPauser(address _pauser) external {
        require(msg.sender == pauser);
        pendingPauser = _pauser;
    }

    function acceptPauser() external {
        require(msg.sender == pendingPauser);
        pauser = pendingPauser;
    }

    function setPause(bool _state) external {
        require(msg.sender == pauser);
        isPaused = _state;
    }

    function setFeeManager(address _feeManager) external {
        require(msg.sender == feeManager, 'not fee manager');
        pendingFeeManager = _feeManager;
    }

    function acceptFeeManager() external {
        require(msg.sender == pendingFeeManager, 'not pending fee manager');
        feeManager = pendingFeeManager;
    }

    function setFee(bool _stable, uint256 _fee) external {
        require(msg.sender == feeManager, 'not fee manager');
        require(_fee <= MAX_FEE, 'fee too high');
        require(_fee != 0, 'fee must be nonzero');
        if (_stable) {
            stableFee = _fee;
        } else {
            volatileFee = _fee;
        }
    }

    function getFee(bool _stable) public view returns(uint256) {
        return _stable ? stableFee : volatileFee;
    }

    function pairCodeHash() external pure returns (bytes32) {
        return keccak256(type(Pair).creationCode);
    }

    function getInitializable() external view returns (address, address, bool) {
        return (_temp0, _temp1, _temp);
    }

    function createPair(address tokenA, address tokenB, bool stable) external returns (address pair) {
        require(tokenA != tokenB, 'IA'); // Pair: IDENTICAL_ADDRESSES
        (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), 'ZA'); // Pair: ZERO_ADDRESS
        require(getPair[token0][token1][stable] == address(0), 'PE'); // Pair: PAIR_EXISTS - single check is sufficient
        bytes32 salt = keccak256(abi.encodePacked(token0, token1, stable)); // notice salt includes stable as well, 3 parameters
        (_temp0, _temp1, _temp) = (token0, token1, stable);
        pair = address(new Pair{salt:salt}());
        getPair[token0][token1][stable] = pair;
        getPair[token1][token0][stable] = pair; // populate mapping in the reverse direction
        allPairs.push(pair);
        isPair[pair] = true;
        emit PairCreated(token0, token1, stable, pair, allPairs.length);
    }
}

File 7 of 8 : PairFees.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.13;

import 'contracts/interfaces/IERC20.sol';

// Pair Fees contract is used as a 1:1 pair relationship to split out fees, this ensures that the curve does not need to be modified for LP shares
contract PairFees {

    address internal immutable pair; // The pair it is bonded to
    address internal immutable token0; // token0 of pair, saved localy and statically for gas optimization
    address internal immutable token1; // Token1 of pair, saved localy and statically for gas optimization

    constructor(address _token0, address _token1) {
        pair = msg.sender;
        token0 = _token0;
        token1 = _token1;
    }

    function _safeTransfer(address token,address to,uint256 value) internal {
        require(token.code.length > 0);
        (bool success, bytes memory data) =
        token.call(abi.encodeWithSelector(IERC20.transfer.selector, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))));
    }

    // Allow the pair to transfer fees to users
    function claimFeesFor(address recipient, uint amount0, uint amount1) external {
        require(msg.sender == pair);
        if (amount0 > 0) _safeTransfer(token0, recipient, amount0);
        if (amount1 > 0) _safeTransfer(token1, recipient, amount1);
    }

}

File 8 of 8 : IPairFactory.sol
pragma solidity 0.8.13;

interface IPairFactory {
    function allPairsLength() external view returns (uint);
    function isPair(address pair) external view returns (bool);
    function pairCodeHash() external pure returns (bytes32);
    function getPair(address tokenA, address token, bool stable) external view returns (address);
    function createPair(address tokenA, address tokenB, bool stable) external returns (address pair);
}

Settings
{
  "remappings": [
    "LayerZero/=lib/LayerZero/contracts/",
    "ds-test/=lib/ds-test/src/",
    "forge-optimism/=lib/rollcall/lib/forge-optimism/src/",
    "forge-std/=lib/forge-std/src/",
    "lib/=lib/rollcall/src/lib/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "rollcall/=lib/rollcall/src/",
    "solmate/=lib/solmate/src/",
    "utils/=test/utils/",
    "contracts/=contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "ipfs"
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  "outputSelection": {
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}

Contract Security Audit

Contract ABI

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Deployed Bytecode

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Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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