OPP [Opportunity] Token

OpportunityToken.addLiquidity(uint256,uint256) (#2104-2117) sends eth to arbitrary user
Dangerous calls:
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Unable to find manual contract audit (e.g. Certik, PeckShield, Solidity...)

Reentrancy in OpportunityToken._transfer(address,address,uint256) (#1898-2001):
External calls:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#2095-2101)
External calls sending eth:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
State variables written after the call(s):
- super._transfer(address(this),devAdress,devTokens) (#1938-1942)
- _balances[sender] = _balances[sender].sub(amount,ERC20: transfer amount exceeds balance) (#775-778)
- _balances[recipient] = _balances[recipient].add(amount) (#779)
- super._transfer(address(this),marketing_wallet,marketingTokens) (#1946)
- _balances[sender] = _balances[sender].sub(amount,ERC20: transfer amount exceeds balance) (#775-778)
- _balances[recipient] = _balances[recipient].add(amount) (#779)
Reentrancy in OpportunityToken._transfer(address,address,uint256) (#1898-2001):
External calls:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#2095-2101)
- swapAndSendDividends(sellTokens) (#1951)
- dividendTracker.distributeDividends(tokens) (#2121)
External calls sending eth:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
State variables written after the call(s):
- swapAndSendDividends(sellTokens) (#1951)
- _balances[sender] = _balances[sender].sub(amount,ERC20: transfer amount exceeds balance) (#775-778)
- _balances[recipient] = _balances[recipient].add(amount) (#779)
- super._transfer(from,address(this),fees) (#1972)
- _balances[sender] = _balances[sender].sub(amount,ERC20: transfer amount exceeds balance) (#775-778)
- _balances[recipient] = _balances[recipient].add(amount) (#779)
- super._transfer(from,to,amount) (#1975)
- _balances[sender] = _balances[sender].sub(amount,ERC20: transfer amount exceeds balance) (#775-778)
- _balances[recipient] = _balances[recipient].add(amount) (#779)
- swapping = false (#1952)
Reentrancy in DividendPayingToken._withdrawDividendOfUser(address) (#1361-1388):
External calls:
- (success) = user.call{gas: 3000,value: _withdrawableDividend}() (#1372-1375)
State variables written after the call(s):
- withdrawnDividends[user] = withdrawnDividends[user].sub(_withdrawableDividend) (#1378-1380)
Apply the check-effects-interactions pattern.

Additional information: link

Contract ownership is not renounced (belongs to a wallet)

Contract locking ether found:
Contract OpportunityDividendTracker (#2143-2436) has payable functions:
- DividendPayingToken.receive() (#1324-1327)
But does not have a function to withdraw the ether
Remove the payable attribute or add a withdraw function.

Additional information: link

Combination 1: Reentrancy vulnerabilities + Functions that send Ether to arbitraty destination. Usual for scams. May be justified by some complex mechanics (e.g. rebase, reflections). DYOR & manual audit are advised.

Ownable.constructor().msgSender (#361) lacks a zero-check on :
- _owner = msgSender (#362)
Check that the address is not zero.

Additional information: link

OpportunityDividendTracker.process(uint256) (#2364-2418) has external calls inside a loop: holdingTime = opportunitypay._getLastTimeTransfer(account) (#2398)
OpportunityDividendTracker._withdrawDividendOfUser(address) (#2182-2209) has external calls inside a loop: success = IERC20(address(opportunitypay)).transfer(user,_withdrawableDividend) (#2193-2196)
Favor pull over push strategy for external calls.

Additional information: link

Redundant expression "this (#344)" inContext (#338-347)
Remove redundant statements if they congest code but offer no value.

Additional information: link

Reentrancy in OpportunityDividendTracker._withdrawDividendOfUser(address) (#2182-2209):
External calls:
- success = IERC20(address(opportunitypay)).transfer(user,_withdrawableDividend) (#2193-2196)
State variables written after the call(s):
- withdrawnDividends[user] = withdrawnDividends[user].sub(_withdrawableDividend) (#2199-2201)
Reentrancy in OpportunityToken.updateDividendTracker(address) (#1693-1716):
External calls:
- newDividendTracker.excludeFromDividends(address(newDividendTracker)) (#1708)
- newDividendTracker.excludeFromDividends(address(this)) (#1709)
- newDividendTracker.excludeFromDividends(owner()) (#1710)
- newDividendTracker.excludeFromDividends(address(uniswapV2Router)) (#1711)
State variables written after the call(s):
- dividendTracker = newDividendTracker (#1715)
Apply the check-effects-interactions pattern.

Additional information: link

OpportunityToken._transfer(address,address,uint256).claims (#1987) is a local variable never initialized
OpportunityToken._transfer(address,address,uint256).lastProcessedIndex (#1988) is a local variable never initialized
OpportunityToken._transfer(address,address,uint256).iterations (#1986) is a local variable never initialized
Initialize all the variables. If a variable is meant to be initialized to zero, explicitly set it to zero to improve code readability.

Additional information: link

OpportunityToken.claim() (#1886-1888) ignores return value by dividendTracker.processAccount(msg.sender,false) (#1887)
OpportunityToken._transfer(address,address,uint256) (#1898-2001) ignores return value by dividendTracker.process(gas) (#1985-1998)
OpportunityToken.addLiquidity(uint256,uint256) (#2104-2117) ignores return value by uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
Ensure that all the return values of the function calls are used.

Additional information: link

DividendPayingToken.constructor(string,string)._name (#1318) shadows:
- ERC20._name (#549) (state variable)
DividendPayingToken.constructor(string,string)._symbol (#1318) shadows:
- ERC20._symbol (#550) (state variable)
DividendPayingToken.dividendOf(address)._owner (#1393) shadows:
- Ownable._owner (#350) (state variable)
DividendPayingToken.withdrawableDividendOf(address)._owner (#1400) shadows:
- Ownable._owner (#350) (state variable)
DividendPayingToken.withdrawnDividendOf(address)._owner (#1412) shadows:
- Ownable._owner (#350) (state variable)
DividendPayingToken.accumulativeDividendOf(address)._owner (#1426) shadows:
- Ownable._owner (#350) (state variable)
Rename the local variables that shadow another component.

Additional information: link

OpportunityToken.setdevwalletFee(uint256) (#1661-1666) should emit an event for:
- devwalletFee = _newAmount (#1662)
- totalFees = devwalletFee.add(holdersFee).add(marketingFee).add(liquidityFee) (#1663-1665)
OpportunityToken.setHoldersFee(uint256) (#1668-1673) should emit an event for:
- totalFees = devwalletFee.add(holdersFee).add(marketingFee).add(liquidityFee) (#1670-1672)
OpportunityToken.setMarketingFee(uint256) (#1675-1680) should emit an event for:
- marketingFee = _newAmount (#1676)
- totalFees = devwalletFee.add(holdersFee).add(marketingFee).add(liquidityFee) (#1677-1679)
OpportunityToken.setLiquidityFee(uint256) (#1682-1687) should emit an event for:
- liquidityFee = _newAmount (#1683)
- totalFees = devwalletFee.add(holdersFee).add(marketingFee).add(liquidityFee) (#1684-1686)
OpportunityToken.updateBuyLimit(uint256) (#2125-2127) should emit an event for:
- buyLimit = limit (#2126)
OpportunityToken.updateSellLimit(uint256) (#2129-2131) should emit an event for:
- sellLimit = limit (#2130)
Emit an event for critical parameter changes.

Additional information: link

Variable 'OpportunityToken._transfer(address,address,uint256).claims (#1987)' in OpportunityToken._transfer(address,address,uint256) (#1898-2001) potentially used before declaration: ProcessedDividendTracker(iterations,claims,lastProcessedIndex,true,gas,tx.origin) (#1990-1997)
Variable 'OpportunityToken._transfer(address,address,uint256).lastProcessedIndex (#1988)' in OpportunityToken._transfer(address,address,uint256) (#1898-2001) potentially used before declaration: ProcessedDividendTracker(iterations,claims,lastProcessedIndex,true,gas,tx.origin) (#1990-1997)
Variable 'OpportunityToken._transfer(address,address,uint256).iterations (#1986)' in OpportunityToken._transfer(address,address,uint256) (#1898-2001) potentially used before declaration: ProcessedDividendTracker(iterations,claims,lastProcessedIndex,true,gas,tx.origin) (#1990-1997)
Move all variable declarations prior to any usage of the variable, and ensure that reaching a variable declaration does not depend on some conditional if it is used unconditionally.

Additional information: link

Reentrancy in OpportunityToken._transfer(address,address,uint256) (#1898-2001):
External calls:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#2095-2101)
- swapAndSendDividends(sellTokens) (#1951)
- dividendTracker.distributeDividends(tokens) (#2121)
External calls sending eth:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
State variables written after the call(s):
- _validateTime(from,to,takeFee) (#1964)
- _buyTime[recipient] = now (#2031)
- _validateTime(from,to,takeFee) (#1964)
- _sellTime[sender] = now (#2037)
Reentrancy in OpportunityToken._transfer(address,address,uint256) (#1898-2001):
External calls:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#2095-2101)
- swapAndSendDividends(sellTokens) (#1951)
- dividendTracker.distributeDividends(tokens) (#2121)
- dividendTracker.setBalance(address(from),balanceOf(from)) (#1977-1979)
- dividendTracker.setBalance(address(to),balanceOf(to)) (#1980)
- dividendTracker.process(gas) (#1985-1998)
External calls sending eth:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
State variables written after the call(s):
- lastTransferTime[to] = now (#2000)
Reentrancy in OpportunityToken.constructor() (#1592-1653):
External calls:
- _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (#1626-1627)
State variables written after the call(s):
- uniswapV2Pair = _uniswapV2Pair (#1630)
- uniswapV2Router = _uniswapV2Router (#1629)
Reentrancy in OpportunityToken.constructor() (#1592-1653):
External calls:
- _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (#1626-1627)
- _setAutomatedMarketMakerPair(_uniswapV2Pair,true) (#1632)
- dividendTracker.excludeFromDividends(pair) (#1768)
- dividendTracker.excludeFromDividends(address(dividendTracker)) (#1635)
- dividendTracker.excludeFromDividends(address(this)) (#1636)
- dividendTracker.excludeFromDividends(owner()) (#1637)
- dividendTracker.excludeFromDividends(0x8c7702376c638500119134d69f05514F2742c500) (#1638-1640)
- dividendTracker.excludeFromDividends(address(_uniswapV2Router)) (#1641)
State variables written after the call(s):
- _mint(0x8c7702376c638500119134d69f05514F2742c500,10000000 * (10 ** 18)) (#1651)
- _balances[account] = _balances[account].add(amount) (#798)
- excludeFromFees(liquidityWallet,true) (#1644)
- _isExcludedFromFees[account] = excluded (#1732)
- excludeFromFees(address(this),true) (#1645)
- _isExcludedFromFees[account] = excluded (#1732)
- _mint(0x8c7702376c638500119134d69f05514F2742c500,10000000 * (10 ** 18)) (#1651)
- _totalSupply = _totalSupply.add(amount) (#797)
Reentrancy in OpportunityDividendTracker.processAccount(address,bool) (#2420-2434):
External calls:
- amount = _withdrawDividendOfUser(account) (#2425)
- success = IERC20(address(opportunitypay)).transfer(user,_withdrawableDividend) (#2193-2196)
State variables written after the call(s):
- lastClaimTimes[account] = block.timestamp (#2428)
Reentrancy in OpportunityToken.swapAndLiquify(uint256) (#2063-2084):
External calls:
- swapTokensForEth(half) (#2075)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#2095-2101)
- addLiquidity(otherHalf,newBalance) (#2081)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
External calls sending eth:
- addLiquidity(otherHalf,newBalance) (#2081)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
State variables written after the call(s):
- addLiquidity(otherHalf,newBalance) (#2081)
- _allowances[owner][spender] = amount (#847)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in OpportunityToken._setAutomatedMarketMakerPair(address,bool) (#1760-1772):
External calls:
- dividendTracker.excludeFromDividends(pair) (#1768)
Event emitted after the call(s):
- SetAutomatedMarketMakerPair(pair,value) (#1771)
Reentrancy in OpportunityToken._transfer(address,address,uint256) (#1898-2001):
External calls:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#2095-2101)
External calls sending eth:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
Event emitted after the call(s):
- Transfer(sender,recipient,amount) (#780)
- super._transfer(address(this),marketing_wallet,marketingTokens) (#1946)
- Transfer(sender,recipient,amount) (#780)
- super._transfer(address(this),devAdress,devTokens) (#1938-1942)
Reentrancy in OpportunityToken._transfer(address,address,uint256) (#1898-2001):
External calls:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#2095-2101)
- swapAndSendDividends(sellTokens) (#1951)
- dividendTracker.distributeDividends(tokens) (#2121)
External calls sending eth:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
Event emitted after the call(s):
- SendDividends(tokens) (#2122)
- swapAndSendDividends(sellTokens) (#1951)
- Transfer(sender,recipient,amount) (#780)
- super._transfer(from,to,amount) (#1975)
- Transfer(sender,recipient,amount) (#780)
- swapAndSendDividends(sellTokens) (#1951)
- Transfer(sender,recipient,amount) (#780)
- super._transfer(from,address(this),fees) (#1972)
Reentrancy in OpportunityToken._transfer(address,address,uint256) (#1898-2001):
External calls:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#2095-2101)
- swapAndSendDividends(sellTokens) (#1951)
- dividendTracker.distributeDividends(tokens) (#2121)
- dividendTracker.setBalance(address(from),balanceOf(from)) (#1977-1979)
- dividendTracker.setBalance(address(to),balanceOf(to)) (#1980)
- dividendTracker.process(gas) (#1985-1998)
External calls sending eth:
- swapAndLiquify(swapTokens) (#1932)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
Event emitted after the call(s):
- ProcessedDividendTracker(iterations,claims,lastProcessedIndex,true,gas,tx.origin) (#1990-1997)
Reentrancy in OpportunityToken.constructor() (#1592-1653):
External calls:
- _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (#1626-1627)
- _setAutomatedMarketMakerPair(_uniswapV2Pair,true) (#1632)
- dividendTracker.excludeFromDividends(pair) (#1768)
Event emitted after the call(s):
- SetAutomatedMarketMakerPair(pair,value) (#1771)
- _setAutomatedMarketMakerPair(_uniswapV2Pair,true) (#1632)
Reentrancy in OpportunityToken.constructor() (#1592-1653):
External calls:
- _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (#1626-1627)
- _setAutomatedMarketMakerPair(_uniswapV2Pair,true) (#1632)
- dividendTracker.excludeFromDividends(pair) (#1768)
- dividendTracker.excludeFromDividends(address(dividendTracker)) (#1635)
- dividendTracker.excludeFromDividends(address(this)) (#1636)
- dividendTracker.excludeFromDividends(owner()) (#1637)
- dividendTracker.excludeFromDividends(0x8c7702376c638500119134d69f05514F2742c500) (#1638-1640)
- dividendTracker.excludeFromDividends(address(_uniswapV2Router)) (#1641)
Event emitted after the call(s):
- ExcludeFromFees(account,excluded) (#1734)
- excludeFromFees(address(this),true) (#1645)
- ExcludeFromFees(account,excluded) (#1734)
- excludeFromFees(liquidityWallet,true) (#1644)
- Transfer(address(0),account,amount) (#799)
- _mint(0x8c7702376c638500119134d69f05514F2742c500,10000000 * (10 ** 18)) (#1651)
Reentrancy in OpportunityDividendTracker.processAccount(address,bool) (#2420-2434):
External calls:
- amount = _withdrawDividendOfUser(account) (#2425)
- success = IERC20(address(opportunitypay)).transfer(user,_withdrawableDividend) (#2193-2196)
Event emitted after the call(s):
- Claim(account,amount,automatic) (#2429)
Reentrancy in OpportunityToken.processDividendTracker(uint256) (#1870-1884):
External calls:
- (iterations,claims,lastProcessedIndex) = dividendTracker.process(gas) (#1871-1875)
Event emitted after the call(s):
- ProcessedDividendTracker(iterations,claims,lastProcessedIndex,false,gas,tx.origin) (#1876-1883)
Reentrancy in OpportunityToken.swapAndLiquify(uint256) (#2063-2084):
External calls:
- swapTokensForEth(half) (#2075)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (#2095-2101)
- addLiquidity(otherHalf,newBalance) (#2081)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
External calls sending eth:
- addLiquidity(otherHalf,newBalance) (#2081)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (#2109-2116)
Event emitted after the call(s):
- Approval(owner,spender,amount) (#848)
- addLiquidity(otherHalf,newBalance) (#2081)
- SwapAndLiquify(half,newBalance,otherHalf) (#2083)
Reentrancy in OpportunityToken.swapAndSendDividends(uint256) (#2119-2123):
External calls:
- dividendTracker.distributeDividends(tokens) (#2121)
Event emitted after the call(s):
- SendDividends(tokens) (#2122)
Reentrancy in OpportunityToken.updateDividendTracker(address) (#1693-1716):
External calls:
- newDividendTracker.excludeFromDividends(address(newDividendTracker)) (#1708)
- newDividendTracker.excludeFromDividends(address(this)) (#1709)
- newDividendTracker.excludeFromDividends(owner()) (#1710)
- newDividendTracker.excludeFromDividends(address(uniswapV2Router)) (#1711)
Event emitted after the call(s):
- UpdateDividendTracker(newAddress,address(dividendTracker)) (#1713)
Apply the check-effects-interactions pattern.

Additional information: link

OpportunityToken._validateTime(address,address,bool) (#2019-2040) uses timestamp for comparisons
Dangerous comparisons:
- require(bool,string)(_buyTime[recipient] + 240 <= now,wait 4 minutes to buy again) (#2027-2030)
- require(bool,string)(_sellTime[sender] + 300 <= now,wait 5 minutes to sell again) (#2033-2036)
OpportunityDividendTracker.getAccount(address) (#2257-2304) uses timestamp for comparisons
Dangerous comparisons:
- nextClaimTime > block.timestamp (#2301-2303)
OpportunityDividendTracker.canAutoClaim(uint256) (#2338-2343) uses timestamp for comparisons
Dangerous comparisons:
- lastClaimTime > block.timestamp (#2339)
- block.timestamp.sub(lastClaimTime) >= claimWait (#2342)
Avoid relying on block.timestamp.

Additional information: link

Context._msgData() (#343-346) is never used and should be removed
DividendPayingToken._transfer(address,address,uint256) (#1445-1460) is never used and should be removed
DividendPayingToken._withdrawDividendOfUser(address) (#1361-1388) is never used and should be removed
SafeMath.mod(uint256,uint256) (#134-136) is never used and should be removed
SafeMath.mod(uint256,uint256,string) (#150-157) is never used and should be removed
SafeMathInt.abs(int256) (#236-239) is never used and should be removed
SafeMathInt.div(int256,int256) (#207-213) is never used and should be removed
SafeMathInt.mul(int256,int256) (#195-202) is never used and should be removed
Remove unused functions.

Additional information: link

Pragma version^0.6.2 (#3) allows old versions
Deploy with any of the following Solidity versions: 0.5.16 - 0.5.17, 0.6.11 - 0.6.12, 0.7.5 - 0.7.6 Use a simple pragma version that allows any of these versions. Consider using the latest version of Solidity for testing.

Additional information: link

Low level call in DividendPayingToken._withdrawDividendOfUser(address) (#1361-1388):
- (success) = user.call{gas: 3000,value: _withdrawableDividend}() (#1372-1375)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Function IUniswapV2Router01.WETH() (#875) is not in mixedCase
Function IUniswapV2Pair.DOMAIN_SEPARATOR() (#1143) is not in mixedCase
Function IUniswapV2Pair.PERMIT_TYPEHASH() (#1145) is not in mixedCase
Function IUniswapV2Pair.MINIMUM_LIQUIDITY() (#1176) is not in mixedCase
Parameter DividendPayingToken.dividendOf(address)._owner (#1393) is not in mixedCase
Parameter DividendPayingToken.withdrawableDividendOf(address)._owner (#1400) is not in mixedCase
Parameter DividendPayingToken.withdrawnDividendOf(address)._owner (#1412) is not in mixedCase
Parameter DividendPayingToken.accumulativeDividendOf(address)._owner (#1426) is not in mixedCase
Constant DividendPayingToken.magnitude (#1298) is not in UPPER_CASE_WITH_UNDERSCORES
Parameter OpportunityToken.setdevwalletFee(uint256)._newAmount (#1661) is not in mixedCase
Parameter OpportunityToken.setHoldersFee(uint256)._newAmount (#1668) is not in mixedCase
Parameter OpportunityToken.setMarketingFee(uint256)._newAmount (#1675) is not in mixedCase
Parameter OpportunityToken.setLiquidityFee(uint256)._newAmount (#1682) is not in mixedCase
Function OpportunityToken._getLastTimeTransfer(address) (#2058-2061) is not in mixedCase
Parameter OpportunityToken._getLastTimeTransfer(address)._to (#2058) is not in mixedCase
Variable OpportunityToken.marketing_wallet (#1517) is not in mixedCase
Variable OpportunityToken._sellTime (#1537) is not in mixedCase
Variable OpportunityToken._buyTime (#1538) is not in mixedCase
Variable OpportunityToken._isBlacklisted (#1539) is not in mixedCase
Parameter OpportunityDividendTracker.getAccount(address)._account (#2257) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Variable IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (#880) is too similar to IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (#881)
Variable OpportunityDividendTracker._withdrawDividendOfUser(address)._withdrawableDividend (#2187) is too similar to OpportunityDividendTracker.getAccount(address).withdrawableDividends (#2264)
Variable DividendPayingToken._withdrawDividendOfUser(address)._withdrawableDividend (#1366) is too similar to OpportunityDividendTracker.getAccount(address).withdrawableDividends (#2264)
Prevent variables from having similar names.

Additional information: link

OpportunityToken.constructor() (#1592-1653) uses literals with too many digits:
- _mint(0x8c7702376c638500119134d69f05514F2742c500,10000000 * (10 ** 18)) (#1651)
OpportunityToken.updateGasForProcessing(uint256) (#1787-1798) uses literals with too many digits:
- require(bool,string)(newValue >= 200000 && newValue <= 500000,Opportunity: gasForProcessing must be between 200,000 and 500,000) (#1788-1791)
OpportunityToken.slitherConstructorVariables() (#1499-2141) uses literals with too many digits:
- swapTokensAtAmount = 200000 * (10 ** 18) (#1520)
OpportunityToken.slitherConstructorVariables() (#1499-2141) uses literals with too many digits:
- gasForProcessing = 300000 (#1530)
OpportunityDividendTracker.getAccountAtIndex(uint256) (#2306-2336) uses literals with too many digits:
- (0x0000000000000000000000000000000000000000,- 1,- 1,0,0,0,0,0) (#2321-2330)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

SafeMathInt.MAX_INT256 (#190) is never used in SafeMathInt (#188-245)
Remove unused state variables.

Additional information: link

OpportunityToken.swapTokensAtAmount (#1520) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

get(IterableMapping.Map,address) should be declared external:
- IterableMapping.get(IterableMapping.Map,address) (#268-270)
getIndexOfKey(IterableMapping.Map,address) should be declared external:
- IterableMapping.getIndexOfKey(IterableMapping.Map,address) (#272-281)
getKeyAtIndex(IterableMapping.Map,uint256) should be declared external:
- IterableMapping.getKeyAtIndex(IterableMapping.Map,uint256) (#283-289)
size(IterableMapping.Map) should be declared external:
- IterableMapping.size(IterableMapping.Map) (#291-293)
renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (#388-391)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (#397-404)
name() should be declared external:
- ERC20.name() (#569-571)
symbol() should be declared external:
- ERC20.symbol() (#577-579)
decimals() should be declared external:
- ERC20.decimals() (#594-596)
transfer(address,uint256) should be declared external:
- ERC20.transfer(address,uint256) (#626-634)
allowance(address,address) should be declared external:
- ERC20.allowance(address,address) (#639-647)
approve(address,uint256) should be declared external:
- ERC20.approve(address,uint256) (#656-664)
transferFrom(address,address,uint256) should be declared external:
- ERC20.transferFrom(address,address,uint256) (#679-694)
increaseAllowance(address,uint256) should be declared external:
- ERC20.increaseAllowance(address,uint256) (#708-719)
decreaseAllowance(address,uint256) should be declared external:
- ERC20.decreaseAllowance(address,uint256) (#735-749)
distributeDividends(uint256) should be declared external:
- DividendPayingToken.distributeDividends(uint256) (#1342-1353)
withdrawDividend() should be declared external:
- DividendPayingToken.withdrawDividend() (#1357-1359)
- OpportunityDividendTracker.withdrawDividend() (#2219-2224)
dividendOf(address) should be declared external:
- DividendPayingToken.dividendOf(address) (#1393-1395)
withdrawnDividendOf(address) should be declared external:
- DividendPayingToken.withdrawnDividendOf(address) (#1412-1419)
setSwapAndLiquifyEnabled(bool) should be declared external:
- OpportunityToken.setSwapAndLiquifyEnabled(bool) (#1657-1659)
setdevwalletFee(uint256) should be declared external:
- OpportunityToken.setdevwalletFee(uint256) (#1661-1666)
setHoldersFee(uint256) should be declared external:
- OpportunityToken.setHoldersFee(uint256) (#1668-1673)
setMarketingFee(uint256) should be declared external:
- OpportunityToken.setMarketingFee(uint256) (#1675-1680)
setLiquidityFee(uint256) should be declared external:
- OpportunityToken.setLiquidityFee(uint256) (#1682-1687)
changeTimeLimitBoolean(bool) should be declared external:
- OpportunityToken.changeTimeLimitBoolean(bool) (#1689-1691)
updateDividendTracker(address) should be declared external:
- OpportunityToken.updateDividendTracker(address) (#1693-1716)
updateUniswapV2Router(address) should be declared external:
- OpportunityToken.updateUniswapV2Router(address) (#1718-1725)
excludeMultipleAccountsFromFees(address[],bool) should be declared external:
- OpportunityToken.excludeMultipleAccountsFromFees(address[],bool) (#1737-1746)
setAutomatedMarketMakerPair(address,bool) should be declared external:
- OpportunityToken.setAutomatedMarketMakerPair(address,bool) (#1748-1758)
updateLiquidityWallet(address) should be declared external:
- OpportunityToken.updateLiquidityWallet(address) (#1774-1785)
updateGasForProcessing(uint256) should be declared external:
- OpportunityToken.updateGasForProcessing(uint256) (#1787-1798)
isExcludedFromFees(address) should be declared external:
- OpportunityToken.isExcludedFromFees(address) (#1812-1814)
withdrawableDividendOf(address) should be declared external:
- OpportunityToken.withdrawableDividendOf(address) (#1816-1822)
dividendTokenBalanceOf(address) should be declared external:
- OpportunityToken.dividendTokenBalanceOf(address) (#1824-1830)
_getLastTimeTransfer(address) should be declared external:
- OpportunityToken._getLastTimeTransfer(address) (#2058-2061)
getAccountAtIndex(uint256) should be declared external:
- OpportunityDividendTracker.getAccountAtIndex(uint256) (#2306-2336)
process(uint256) should be declared external:
- OpportunityDividendTracker.process(uint256) (#2364-2418)
Use the external attribute for functions never called from the contract.

Additional information: link

Token seems to be untradeable: there is no PancakeSwap trading pair and no trading volumes. Ignore for presale.

Number of Binance Smart Chain (BSC) token holders is less than 100. Token is either dead or inactive. Ignore for presale.

BscScan page for the token does not contain additional info: website, socials, description, etc.

Additional information: link

Unable to find token contract audit

Unable to find audit link on the website

Unable to find token on CoinGecko

Additional information: link

Unable to find token on CoinMarketCap

Additional information: link

Token is not listed at Mobula.Finance

Additional information: link

Unable to find code repository for the project

Young tokens have high risks of scam / price dump / death

Young tokens have high risks of scam / price dump / death

Token has no active CoinGecko listing / rank

Token has no active CoinMarketCap listing / rank

Young tokens have high risks of scam / price dump / death