Address Contract Partially Verified
Address
0xdF9F67004FB7e1B5fF7A91aD5F3De950aF217dFD
Balance
0 ETH
Nonce
1
Code Size
13601 bytes
Creator
0xa9190208...AC01 at tx 0x72cc7bd6...2d1b9b
Indexed Transactions
0
Contract Bytecode
13601 bytes
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Verified Source Code Partial Match
Compiler: v0.6.12+commit.27d51765
EVM: istanbul
Optimization: No
Pool.sol 546 lines
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
// 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(uint x, uint y) internal pure returns (uint z) {
z = x < y ? x : y;
}
// babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
function sqrt(uint y) internal pure returns (uint z) {
if (y > 3) {
z = y;
uint x = y / 2 + 1;
while (x < z) {
z = x;
x = (y / x + x) / 2;
}
} else if (y != 0) {
z = 1;
}
}
}
pragma solidity 0.6.12;
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);
}
pragma solidity 0.6.12;
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);
}
pragma solidity 0.6.12;
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);
}
pragma solidity 0.6.12;
// 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("1")
bytes32 private constant VERSION_HASH = 0xc89efdaa54c0f20c7adf612882df0950f5a951637e0307cdcb4c672f298b8bc6;
// 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 {
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);
}
}
pragma solidity 0.6.12;
contract Pool is PoolERC20, IPool {
using SafeMath for uint256;
uint256 public constant MINIMUM_LIQUIDITY = 10**3;
bytes4 private constant TRANSFER_SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));
address public constant FLASH_TOKEN = 0xB4467E8D621105312a914F1D42f10770C0Ffe3c8;
address public constant FLASH_PROTOCOL = 0xEc02f813404656E2A2AEd5BaeEd41D785324E8D0;
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() public {
factory = msg.sender;
}
function _safeTransfer(
address _token,
address _to,
uint256 _value
) private {
(bool success, bytes memory data) = _token.call(abi.encodeWithSelector(TRANSFER_SELECTOR, _to, _value));
require(success && (data.length == 0 || abi.decode(data, (bool))), "Pool:: TRANSFER_FAILED");
}
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);
_safeTransfer(FLASH_TOKEN, _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);
_safeTransfer(token, _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);
_safeTransfer(FLASH_TOKEN, to, amountFLASH);
_safeTransfer(token, 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);
}
}
Read Contract
FLASH_PROTOCOL 0xa7f0e903 → address
FLASH_TOKEN 0x23c6e14c → address
MINIMUM_LIQUIDITY 0xba9a7a56 → uint256
PERMIT_TYPEHASH 0x30adf81f → bytes32
TRANSFER_WITH_AUTHORIZATION_TYPEHASH 0xa0cc6a68 → bytes32
allowance 0xdd62ed3e → uint256
authorizationState 0xe94a0102 → bool
balanceOf 0x70a08231 → uint256
decimals 0x313ce567 → uint8
factory 0xc45a0155 → address
getAPYStake 0x41154270 → uint256
getAPYSwap 0xa10adb17 → uint256
getChainId 0x3408e470 → uint256
getDomainSeparator 0xed24911d → bytes32
getLPFee 0x3750a8bd → uint256
minter 0x07546172 → address
name 0x06fdde03 → string
nonces 0x7ecebe00 → uint256
quote 0xad615dec → uint256
reserveAltAmount 0xc0bd9f16 → uint256
reserveFlashAmount 0x4d861ece → uint256
symbol 0x95d89b41 → string
token 0xfc0c546a → address
totalSupply 0x18160ddd → uint256
Write Contract 11 functions
These functions modify contract state and require a wallet transaction to execute.
addLiquidity 0xe0ab0772
uint256 _amountFLASH
uint256 _amountALT
uint256 _amountFLASHMin
uint256 _amountALTMin
address _maker
returns: uint256, uint256, uint256
approve 0x095ea7b3
address spender
uint256 value
returns: bool
burn 0x42966c68
uint256 value
returns: bool
initialize 0xc4d66de8
address _token
permit 0xd505accf
address owner
address spender
uint256 value
uint256 deadline
uint8 v
bytes32 r
bytes32 s
removeLiquidity 0xd798f86e
address _maker
returns: uint256, uint256
stakeWithFeeRewardDistribution 0x687fbed8
uint256 _amountIn
address _staker
uint256 _expectedOutput
returns: uint256
swapWithFeeRewardDistribution 0x50b814a0
uint256 _amountIn
address _staker
uint256 _expectedOutput
returns: uint256
transfer 0xa9059cbb
address to
uint256 value
returns: bool
transferFrom 0x23b872dd
address from
address to
uint256 value
returns: bool
transferWithAuthorization 0xe3ee160e
address from
address to
uint256 value
uint256 validAfter
uint256 validBefore
bytes32 nonce
uint8 v
bytes32 r
bytes32 s
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