Contract 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 12

 
Txn Hash Method
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0xd513fcd7f0961cfb1098d40011eeefeca6fa0450838d59be95ba2fa0fadba75dApprove1162914432024-02-17 14:54:238 days 11 hrs ago0x6b9c944deb574ed6f2a5b6b3e6c25165535b71da IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000490560540.008491334
0x790bf8de82453880113cd0d01ccfa2c3c9c138e3614cd6237a342e963b9a1c40Approve1149528602024-01-17 15:14:5739 days 11 hrs ago0xa9903bda477b9a57bd795adff9922cb98db65f04 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000668946210.005992975
0x47a68e0bb555d646b76df29f9536c786120c35b6bd538dd0b1257bab6e94a275Approve1149527932024-01-17 15:12:4339 days 11 hrs ago0xa9903bda477b9a57bd795adff9922cb98db65f04 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000726126080.007860716
0xb1f2c8799233a98420880974b9406909b668667635e70c2414a04929e3f0996cApprove1149523522024-01-17 14:58:0139 days 11 hrs ago0xa9903bda477b9a57bd795adff9922cb98db65f04 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000590725960.006749508
0x821f59581aa48d768fa0192126969b1ba59272cce7e5131bb4739da706aa1f12Skim1148737062024-01-15 19:16:2941 days 7 hrs ago0x7cd3849695a87872dcb6446975292a6c8eb50e31 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000590841280.101248257
0xa905b091ca9acbf86139f23d74a63dc19e791dedb803632a116d88f458b63e62Burn1148732902024-01-15 19:02:3741 days 7 hrs ago0x7cd3849695a87872dcb6446975292a6c8eb50e31 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000555290690.101778218
0x29f0bf1704f0d2bd1afbc47ec4dc07bad7786ca5bd70318d31052b11ce5db92fApprove1148732082024-01-15 18:59:5341 days 7 hrs ago0x7cd3849695a87872dcb6446975292a6c8eb50e31 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000608082110.102573254
0xb5966517a6a3b1797284153360acaf12bc1222fad08dd54c5706dcd195e31bb3Claim Fees1148731632024-01-15 18:58:2341 days 7 hrs ago0x7cd3849695a87872dcb6446975292a6c8eb50e31 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.000054565890.101814154
0x4f9f885322b77c783b5d373246f916b7afe93be8aa4b4cd5744cf2ee9b499fc3Approve1145219492024-01-07 15:51:1549 days 10 hrs ago0xfba38ebf53b5d3956d4e4815db9b88cc01db023b IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000631879180.006366095
0x2b928c0c147954a38faf0083f63c45818609eabfd883c3f6e6b2595c784477a2Transfer From1140875412023-12-28 14:30:5959 days 12 hrs ago0xab87c7615823c8d45ed480e3f5feef39c0e7030b IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0003361402681.508872437
0x27ff0595be8f7ca671675cd0267438061a43e769c67c0410dbc3a1281b7e56bdApprove1140596402023-12-27 23:00:5760 days 3 hrs ago0x924e36660060cad83cc438d0e91b0fb00c35edc6 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000504755060.1067
0x990fcf1af6c45aaece2748b910035ab63afccd1beb6f609626477bbc871fa0ceApprove1138459962023-12-23 0:19:2965 days 2 hrs ago0x6be2bba79a21805d5d38b4a9f71f89a8d695e698 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.000038351290.008018738
0x60115d5809a7286c98854a58580bf410c24332e185ddf9fcbfcbdf8ebe1af9cbApprove1135718762023-12-16 16:02:0971 days 10 hrs ago0x73f2e04f047931e85b62e4f2652b156199000e14 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000962070290.007148804
0xd73aab767d5a8882a66c7c70f4e28783b0bb07cb2f4cce07df82c12832ac04afSkim1135715582023-12-16 15:51:3371 days 10 hrs ago0x73f2e04f047931e85b62e4f2652b156199000e14 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.000088023930.005642375
0x2e914d260624dd67e32714c4e3855ca9ea8fb46b1f44ed6671353ff1272e668aClaim Fees1135715562023-12-16 15:51:2971 days 10 hrs ago0x73f2e04f047931e85b62e4f2652b156199000e14 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000718545820.005696345
0x8604f3c3920a60695ecdcadec73e457eb596fbac06585dcae00399b8f6e56540Approve1125329462023-11-22 14:51:0995 days 11 hrs ago0x7f429edeff8afc7bb3a2cf7db832fc86f6fa99da IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000788890250.024576538
0x6bbc5b669d21f049f20ff7a3265957e0f4d21f4b19e49a8fb01db921d408f7acClaim Fees1122728862023-11-16 14:22:29101 days 12 hrs ago0x65d2c00f06cf64e75e8918262ed45664b6aeff6b IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000459688620.009146754
0x21f7b1e73e6d71f041f23990b969ffebf1a7b9a04654d6113374e8c1664c0089Approve1106797032023-10-10 17:16:23138 days 9 hrs ago0xba0347beb461e046b741a96cd3ce0839b4e2e044 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.000026284350.127105981
0xe9eefd820ce3e0c7c768bf880c3bd5d5e79c6eaa35aaa71f91afa0c5af41c390Approve1106796912023-10-10 17:15:59138 days 9 hrs ago0xba0347beb461e046b741a96cd3ce0839b4e2e044 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000268615490.129142928
0xc11489a91a9c61584d5e6bd98cbe857ad59f2e5cb4e75a11b866f5a69d074b05Approve1105476902023-10-07 15:55:57141 days 10 hrs ago0x930c036d71b0d3e83b9b4f626b0c4fcccbe63551 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000119644070.028383827
0xe3db24c4ef69f0f5d36b06532141f4efbca3d88b03d2acd369c70dcc103beb3bApprove1103771862023-10-03 17:12:29145 days 9 hrs ago0x951214038a220fbdf9803db3dffeb97b12d12314 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000430708990.026132339
0xc62667af38f8b8549b00dadd8fd3dc84da0bc97f7e29777740a020ab37d7c045Approve1103771832023-10-03 17:12:23145 days 9 hrs ago0x951214038a220fbdf9803db3dffeb97b12d12314 IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000469673790.025106654
0x702eff172b344eb1beaf87861f0f98129c714b2f2b8a32dcc818c1457b0d689eApprove1098928402023-09-22 12:07:37156 days 14 hrs ago0xc872cd0638c73b882c09258d94284da15c46fead IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000189724380.171812748
0x33152703ba0ba3c5d7a83616d7ee7ddd6a7a71fa7355fb5bbb8013103cf4ee4cApprove1098925322023-09-22 11:57:21156 days 14 hrs ago0xc872cd0638c73b882c09258d94284da15c46fead IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000182071080.165265256
0xef08b96f3578ec3280b31054a4b45b260ad37353d8a32df230cbbcbf6712bd1cApprove1098925212023-09-22 11:56:59156 days 14 hrs ago0xc872cd0638c73b882c09258d94284da15c46fead IN  0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH0.0000176137260.167772393
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 Velodrome Finance: Pair Factory0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0xed4da4d3b90cb359d0216c0016ac6d9241d817c3 0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 Velodrome Finance: Pair Factory0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0xed4da4d3b90cb359d0216c0016ac6d9241d817c3 0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 Velodrome Finance: Pair Factory0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0xed4da4d3b90cb359d0216c0016ac6d9241d817c3 0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369Hundred Finance: HND Token0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 Velodrome Finance: Pair Factory0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369Hundred Finance: HND Token0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 0x29062d803d8586fde18d37b4a5fa1bbf1b207c350 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369Hundred Finance: HND Token0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 Velodrome Finance: Pair Factory0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x29062d803d8586fde18d37b4a5fa1bbf1b207c35 0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 Velodrome Finance: Pair Factory0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0xed4da4d3b90cb359d0216c0016ac6d9241d817c3 0x588443c932b45f47e936b969eb5aa6b5fd4f33690 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369Hundred Finance: HND Token0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 Velodrome Finance: Pair Factory0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 0x7f5c764cbc14f9669b88837ca1490cca17c316070 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369Hundred Finance: HND Token0 ETH
0xf2079befabc4f7db2cdefd4a07aa4ff3d610d238c3fdea962ac3ef0fdde6f9321075578662023-07-30 10:55:09210 days 15 hrs ago 0x588443c932b45f47e936b969eb5aa6b5fd4f3369 0x29062d803d8586fde18d37b4a5fa1bbf1b207c350 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"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london"
}

Contract Security Audit

Contract ABI

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"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fees","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"address","name":"tokenIn","type":"address"}],"name":"getAmountOut","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getReserves","outputs":[{"internalType":"uint256","name":"_reserve0","type":"uint256"},{"internalType":"uint256","name":"_reserve1","type":"uint256"},{"internalType":"uint256","name":"_blockTimestampLast","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"index0","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"index1","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastObservation","outputs":[{"components":[{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"uint256","name":"reserve0Cumulative","type":"uint256"},{"internalType":"uint256","name":"reserve1Cumulative","type":"uint256"}],"internalType":"struct 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Deployed Bytecode

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Block Transaction Difficulty Gas Used Reward
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