ETH Price: $3,001.80 (+5.29%)
Gas: 2 Gwei

Contract

0xC9fc5a6007c9801ebae1813D4D03208C4E85be44
 

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Approve170137112023-04-09 22:36:59453 days ago1681079819IN
0xC9fc5a60...C4E85be44
0 ETH0.0004180217.2943376
Approve169539122023-04-01 11:09:59461 days ago1680347399IN
0xC9fc5a60...C4E85be44
0 ETH0.0004479118.53107378
Remove Liquidity167716282023-03-06 20:17:23487 days ago1678133843IN
0xC9fc5a60...C4E85be44
0 ETH0.0011233146.83585461
Approve148605052022-05-28 13:20:06769 days ago1653744006IN
0xC9fc5a60...C4E85be44
0 ETH0.0006308526.09954039
Approve145382552022-04-07 10:42:43820 days ago1649328163IN
0xC9fc5a60...C4E85be44
0 ETH0.0024417752.56211034
Approve144297472022-03-21 12:36:25837 days ago1647866185IN
0xC9fc5a60...C4E85be44
0 ETH0.0005183821.44660258
Approve143163442022-03-03 21:06:10855 days ago1646341570IN
0xC9fc5a60...C4E85be44
0 ETH0.0024151951.98990156
Approve135444072021-11-03 14:35:45975 days ago1635950145IN
0xC9fc5a60...C4E85be44
0 ETH0.00638095137.35784609
Approve133646482021-10-06 9:41:141003 days ago1633513274IN
0xC9fc5a60...C4E85be44
0 ETH0.00494679106.48568654
Approve132384012021-09-16 18:30:361023 days ago1631817036IN
0xC9fc5a60...C4E85be44
0 ETH0.0038470682.81276982
Approve132342412021-09-16 3:09:101024 days ago1631761750IN
0xC9fc5a60...C4E85be44
0 ETH0.0037440380.59495812
Approve132070122021-09-11 21:57:021028 days ago1631397422IN
0xC9fc5a60...C4E85be44
0 ETH0.0020440244
Approve132037422021-09-11 9:47:511028 days ago1631353671IN
0xC9fc5a60...C4E85be44
0 ETH0.0024353652.424157
Approve131812302021-09-07 22:04:101032 days ago1631052250IN
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0 ETH0.00350783145.12586645
Approve131649942021-09-05 9:46:471034 days ago1630835207IN
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0 ETH0.0039600585.24501587
Approve131121882021-08-28 6:10:271043 days ago1630131027IN
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0 ETH0.0031026966.78924434
Approve130563462021-08-19 14:53:101051 days ago1629384790IN
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0 ETH0.002162546.55044429
Approve130393362021-08-16 23:50:151054 days ago1629157815IN
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0 ETH0.0018141439.05162301
Approve130099202021-08-12 10:51:201058 days ago1628765480IN
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0 ETH0.0013341128.71845678
Approve129948062021-08-10 2:52:321061 days ago1628563952IN
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0 ETH0.00125347.18513821
Approve129947982021-08-10 2:50:231061 days ago1628563823IN
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0 ETH0.0025085754
Approve129918282021-08-09 15:47:581061 days ago1628524078IN
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0 ETH0.0025289454.43851714
Approve129896472021-08-09 7:47:481062 days ago1628495268IN
0xC9fc5a60...C4E85be44
0 ETH0.0019308341.5635961
Approve129806452021-08-07 22:23:341063 days ago1628375014IN
0xC9fc5a60...C4E85be44
0 ETH0.0012900148.57906768
Approve129806452021-08-07 22:23:341063 days ago1628375014IN
0xC9fc5a60...C4E85be44
0 ETH0.001726637.16733019
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x7aAa0bfC...005Eb337e
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
Pool

Compiler Version
v0.7.4+commit.3f05b770

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-04-09
*/

// Sources flattened with hardhat v2.0.2 https://hardhat.org

// File contracts/libraries/SafeMath.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.7.4;

// A library for performing overflow-safe math, courtesy of DappHub: https://github.com/dapphub/ds-math/blob/d0ef6d6a5f/src/math.sol
// Modified to include only the essentials
library SafeMath {
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x, "MATH:: ADD_OVERFLOW");
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x, "MATH:: SUB_UNDERFLOW");
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "MATH:: MUL_OVERFLOW");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "MATH:: DIVISION_BY_ZERO");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}


// File contracts/interfaces/IERC20.sol

pragma solidity 0.7.4;

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    function burn(uint256 value) external returns (bool);

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


// File contracts/libraries/Address.sol


pragma solidity 0.7.4;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// File contracts/libraries/SafeERC20.sol


pragma solidity 0.7.4;



/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


// File contracts/interfaces/IFlashProtocol.sol


pragma solidity 0.7.4;

interface IFlashProtocol {
    function stake(
        uint256 _amountIn,
        uint256 _days,
        address _receiver,
        bytes calldata _data
    )
        external
        returns (
            uint256 mintedAmount,
            uint256 matchedAmount,
            bytes32 id
        );

    function unstake(bytes32 _id) external returns (uint256 withdrawAmount);

    function getFPY(uint256 _amountIn) external view returns (uint256);
}


// File contracts/pool/interfaces/IPool.sol


pragma solidity 0.7.4;

interface IPool {
    function initialize(address _token) external;

    function stakeWithFeeRewardDistribution(
        uint256 _amountIn,
        address _staker,
        uint256 _expectedOutput
    ) external returns (uint256 result);

    function addLiquidity(
        uint256 _amountFLASH,
        uint256 _amountALT,
        uint256 _amountFLASHMin,
        uint256 _amountALTMin,
        address _maker
    )
        external
        returns (
            uint256,
            uint256,
            uint256
        );

    function removeLiquidity(address _maker) external returns (uint256, uint256);

    function swapWithFeeRewardDistribution(
        uint256 _amountIn,
        address _staker,
        uint256 _expectedOutput
    ) external returns (uint256 result);
}


// File contracts/pool/contracts/PoolERC20.sol


pragma solidity 0.7.4;


// Lightweight token modelled after UNI-LP:
// https://github.com/Uniswap/uniswap-v2-core/blob/v1.0.1/contracts/UniswapV2ERC20.sol
// Adds:
//   - An exposed `mint()` with minting role
//   - An exposed `burn()`
//   - ERC-3009 (`transferWithAuthorization()`)
//   - flashMint() - allows to flashMint an arbitrary amount of FLASH, with the
//     condition that it is burned before the end of the transaction.
contract PoolERC20 is IERC20 {
    using SafeMath for uint256;

    // bytes32 private constant EIP712DOMAIN_HASH =
    // keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")
    bytes32 private constant EIP712DOMAIN_HASH = 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;

    // bytes32 private constant NAME_HASH = keccak256("FLASH-ALT-LP Token")
    bytes32 private constant NAME_HASH = 0xfdde3a7807889787f51ab17062704a0d81341ba7debe5a9773b58a1b5e5f422c;

    // bytes32 private constant VERSION_HASH = keccak256("2")
    bytes32 private constant VERSION_HASH = 0xad7c5bef027816a800da1736444fb58a807ef4c9603b7848673f7e3a68eb14a5;

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

    // bytes32 public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH =
    // keccak256("TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)");
    bytes32
        public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;

    string public constant name = "FLASH-ALT-LP Token";
    string public constant symbol = "FLASH-ALT-LP";
    uint8 public constant decimals = 18;

    uint256 public override totalSupply;

    address public minter;

    mapping(address => uint256) public override balanceOf;
    mapping(address => mapping(address => uint256)) public override allowance;

    // ERC-2612, ERC-3009 state
    mapping(address => uint256) public nonces;
    mapping(address => mapping(bytes32 => bool)) public authorizationState;

    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);

    function _validateSignedData(
        address signer,
        bytes32 encodeData,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal view {
        bytes32 digest = keccak256(abi.encodePacked("\x19\x01", getDomainSeparator(), encodeData));
        address recoveredAddress = ecrecover(digest, v, r, s);
        // Explicitly disallow authorizations for address(0) as ecrecover returns address(0) on malformed messages
        require(recoveredAddress != address(0) && recoveredAddress == signer, "FLASH-ALT-LP Token:: INVALID_SIGNATURE");
    }

    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 {
        // Balance is implicitly checked with SafeMath's underflow protection
        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 {
        require(to != address(0), "FLASH-ALT-LP Token:: RECEIVER_IS_TOKEN_OR_ZERO");
        // Balance is implicitly checked with SafeMath's underflow protection
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function getChainId() public pure returns (uint256 chainId) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            chainId := chainid()
        }
    }

    function getDomainSeparator() public view returns (bytes32) {
        return keccak256(abi.encode(EIP712DOMAIN_HASH, NAME_HASH, VERSION_HASH, getChainId(), address(this)));
    }

    function burn(uint256 value) external override returns (bool) {
        _burn(msg.sender, value);
        return true;
    }

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

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

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external override returns (bool) {
        uint256 fromAllowance = allowance[from][msg.sender];
        if (fromAllowance != uint256(-1)) {
            // Allowance is implicitly checked with SafeMath's underflow protection
            allowance[from][msg.sender] = fromAllowance.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 override {
        require(deadline >= block.timestamp, "FLASH-ALT-LP Token:: AUTH_EXPIRED");

        bytes32 encodeData = keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner], deadline));
        nonces[owner] = nonces[owner].add(1);
        _validateSignedData(owner, encodeData, v, r, s);

        _approve(owner, spender, value);
    }

    function transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(block.timestamp > validAfter, "FLASH-ALT-LP Token:: AUTH_NOT_YET_VALID");
        require(block.timestamp < validBefore, "FLASH-ALT-LP Token:: AUTH_EXPIRED");
        require(!authorizationState[from][nonce], "FLASH-ALT-LP Token:: AUTH_ALREADY_USED");

        bytes32 encodeData = keccak256(
            abi.encode(TRANSFER_WITH_AUTHORIZATION_TYPEHASH, from, to, value, validAfter, validBefore, nonce)
        );
        _validateSignedData(from, encodeData, v, r, s);

        authorizationState[from][nonce] = true;
        emit AuthorizationUsed(from, nonce);

        _transfer(from, to, value);
    }
}


// File contracts/pool/contracts/Pool.sol


pragma solidity 0.7.4;




contract Pool is PoolERC20, IPool {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    uint256 public constant MINIMUM_LIQUIDITY = 10**3;

    address public constant FLASH_TOKEN = 0x20398aD62bb2D930646d45a6D4292baa0b860C1f;
    address public constant FLASH_PROTOCOL = 0x15EB0c763581329C921C8398556EcFf85Cc48275;

    uint256 public reserveFlashAmount;
    uint256 public reserveAltAmount;
    uint256 private unlocked = 1;

    address public token;
    address public factory;

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

    modifier onlyFactory() {
        require(msg.sender == factory, "Pool:: ONLY_FACTORY");
        _;
    }

    constructor() {
        factory = msg.sender;
    }

    function initialize(address _token) public override onlyFactory {
        token = _token;
    }

    function swapWithFeeRewardDistribution(
        uint256 _amountIn,
        address _staker,
        uint256 _expectedOutput
    ) public override lock onlyFactory returns (uint256 result) {
        result = getAPYSwap(_amountIn);
        require(_expectedOutput <= result, "Pool:: EXPECTED_IS_GREATER");
        calcNewReserveSwap(_amountIn, result);
        IERC20(FLASH_TOKEN).safeTransfer(_staker, result);
    }

    function stakeWithFeeRewardDistribution(
        uint256 _amountIn,
        address _staker,
        uint256 _expectedOutput
    ) public override lock onlyFactory returns (uint256 result) {
        result = getAPYStake(_amountIn);
        require(_expectedOutput <= result, "Pool:: EXPECTED_IS_GREATER");
        calcNewReserveStake(_amountIn, result);
        IERC20(token).safeTransfer(_staker, result);
    }

    function addLiquidity(
        uint256 _amountFLASH,
        uint256 _amountALT,
        uint256 _amountFLASHMin,
        uint256 _amountALTMin,
        address _maker
    )
        public
        override
        onlyFactory
        returns (
            uint256 amountFLASH,
            uint256 amountALT,
            uint256 liquidity
        )
    {
        (amountFLASH, amountALT) = _addLiquidity(_amountFLASH, _amountALT, _amountFLASHMin, _amountALTMin);
        liquidity = mintLiquidityTokens(_maker, amountFLASH, amountALT);
        calcNewReserveAddLiquidity(amountFLASH, amountALT);
    }

    function removeLiquidity(address _maker)
        public
        override
        onlyFactory
        returns (uint256 amountFLASH, uint256 amountALT)
    {
        (amountFLASH, amountALT) = burn(_maker);
    }

    function getAPYStake(uint256 _amountIn) public view returns (uint256 result) {
        uint256 amountInWithFee = _amountIn.mul(getLPFee());
        uint256 num = amountInWithFee.mul(reserveAltAmount);
        uint256 den = (reserveFlashAmount.mul(1000)).add(amountInWithFee);
        result = num.div(den);
    }

    function getAPYSwap(uint256 _amountIn) public view returns (uint256 result) {
        uint256 amountInWithFee = _amountIn.mul(getLPFee());
        uint256 num = amountInWithFee.mul(reserveFlashAmount);
        uint256 den = (reserveAltAmount.mul(1000)).add(amountInWithFee);
        result = num.div(den);
    }

    function getLPFee() public view returns (uint256) {
        uint256 fpy = IFlashProtocol(FLASH_PROTOCOL).getFPY(0);
        return uint256(1000).sub(fpy.div(5e15));
    }

    function quote(
        uint256 _amountA,
        uint256 _reserveA,
        uint256 _reserveB
    ) public pure returns (uint256 amountB) {
        require(_amountA > 0, "Pool:: INSUFFICIENT_AMOUNT");
        require(_reserveA > 0 && _reserveB > 0, "Pool:: INSUFFICIENT_LIQUIDITY");
        amountB = _amountA.mul(_reserveB).div(_reserveA);
    }

    function burn(address to) private lock returns (uint256 amountFLASH, uint256 amountALT) {
        uint256 balanceFLASH = IERC20(FLASH_TOKEN).balanceOf(address(this));
        uint256 balanceALT = IERC20(token).balanceOf(address(this));
        uint256 liquidity = balanceOf[address(this)];

        amountFLASH = liquidity.mul(balanceFLASH) / totalSupply;
        amountALT = liquidity.mul(balanceALT) / totalSupply;

        require(amountFLASH > 0 && amountALT > 0, "Pool:: INSUFFICIENT_LIQUIDITY_BURNED");

        _burn(address(this), liquidity);

        IERC20(FLASH_TOKEN).safeTransfer(to, amountFLASH);
        IERC20(token).safeTransfer(to, amountALT);

        balanceFLASH = balanceFLASH.sub(IERC20(FLASH_TOKEN).balanceOf(address(this)));
        balanceALT = balanceALT.sub(IERC20(token).balanceOf(address(this)));

        calcNewReserveRemoveLiquidity(balanceFLASH, balanceALT);
    }

    function _addLiquidity(
        uint256 _amountFLASH,
        uint256 _amountALT,
        uint256 _amountFLASHMin,
        uint256 _amountALTMin
    ) private view returns (uint256 amountFLASH, uint256 amountALT) {
        if (reserveAltAmount == 0 && reserveFlashAmount == 0) {
            (amountFLASH, amountALT) = (_amountFLASH, _amountALT);
        } else {
            uint256 amountALTQuote = quote(_amountFLASH, reserveFlashAmount, reserveAltAmount);
            if (amountALTQuote <= _amountALT) {
                require(amountALTQuote >= _amountALTMin, "Pool:: INSUFFICIENT_B_AMOUNT");
                (amountFLASH, amountALT) = (_amountFLASH, amountALTQuote);
            } else {
                uint256 amountFLASHQuote = quote(_amountALT, reserveAltAmount, reserveFlashAmount);
                require(
                    (amountFLASHQuote <= _amountFLASH) && (amountFLASHQuote >= _amountFLASHMin),
                    "Pool:: INSUFFICIENT_A_AMOUNT"
                );
                (amountFLASH, amountALT) = (amountFLASHQuote, _amountALT);
            }
        }
    }

    function mintLiquidityTokens(
        address _to,
        uint256 _flashAmount,
        uint256 _altAmount
    ) private returns (uint256 liquidity) {
        if (totalSupply == 0) {
            liquidity = SafeMath.sqrt(_flashAmount.mul(_altAmount)).sub(MINIMUM_LIQUIDITY);
            _mint(address(0), MINIMUM_LIQUIDITY);
        } else {
            liquidity = SafeMath.min(
                _flashAmount.mul(totalSupply) / reserveFlashAmount,
                _altAmount.mul(totalSupply) / reserveAltAmount
            );
        }
        require(liquidity > 0, "Pool:: INSUFFICIENT_LIQUIDITY_MINTED");
        _mint(_to, liquidity);
    }

    function calcNewReserveStake(uint256 _amountIn, uint256 _amountOut) private {
        reserveFlashAmount = reserveFlashAmount.add(_amountIn);
        reserveAltAmount = reserveAltAmount.sub(_amountOut);
    }

    function calcNewReserveSwap(uint256 _amountIn, uint256 _amountOut) private {
        reserveFlashAmount = reserveFlashAmount.sub(_amountOut);
        reserveAltAmount = reserveAltAmount.add(_amountIn);
    }

    function calcNewReserveAddLiquidity(uint256 _amountFLASH, uint256 _amountALT) private {
        reserveFlashAmount = reserveFlashAmount.add(_amountFLASH);
        reserveAltAmount = reserveAltAmount.add(_amountALT);
    }

    function calcNewReserveRemoveLiquidity(uint256 _amountFLASH, uint256 _amountALT) private {
        reserveFlashAmount = reserveFlashAmount.sub(_amountFLASH);
        reserveAltAmount = reserveAltAmount.sub(_amountALT);
    }
}

Contract Security Audit

Contract ABI

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Deployed Bytecode

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Swarm Source

ipfs://9683472579f7daa8f010c335cb11c4719f0438a7518f90532d9eeb74d4a68584

Block Transaction Difficulty 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.