NICKEL Token

NICKEL.addLiquidity(uint256,uint256) (contracts/NICKEL.sol#448-463) sends eth to arbitrary user
Dangerous calls:
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
NICKEL.swapAndSendMarketing(uint256) (contracts/NICKEL.sol#465-473) sends eth to arbitrary user
Dangerous calls:
- (success) = marketingWallet.call{value: marketingBNB}() (contracts/NICKEL.sol#468)
Ensure that an arbitrary user cannot withdraw unauthorized funds.

Additional information: link

Reentrancy in NICKEL._transfer(address,address,uint256) (contracts/NICKEL.sol#313-402):
External calls:
- swapAndLiquify(swapTokens) (contracts/NICKEL.sol#358)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
- swapAndSendDividends(sellTokens) (contracts/NICKEL.sol#361)
- (success) = address(dividendTracker).call{value: dividends}() (contracts/NICKEL.sol#478)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
External calls sending eth:
- swapAndLiquify(swapTokens) (contracts/NICKEL.sol#358)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
- swapAndSendDividends(sellTokens) (contracts/NICKEL.sol#361)
- (success) = address(dividendTracker).call{value: dividends}() (contracts/NICKEL.sol#478)
State variables written after the call(s):
- super._transfer(from,address(this),fees) (contracts/NICKEL.sol#384)
- _balances[sender] = _balances[sender].sub(amount,ERC20: transfer amount exceeds balance) (contracts/ERC20.sol#221)
- _balances[recipient] = _balances[recipient].add(amount) (contracts/ERC20.sol#222)
- super._transfer(from,to,amount) (contracts/NICKEL.sol#387)
- _balances[sender] = _balances[sender].sub(amount,ERC20: transfer amount exceeds balance) (contracts/ERC20.sol#221)
- _balances[recipient] = _balances[recipient].add(amount) (contracts/ERC20.sol#222)
- swapping = false (contracts/NICKEL.sol#363)
Reentrancy in DividendPayingToken._withdrawDividendOfUser(address) (contracts/DividendPayingToken.sol#89-105):
External calls:
- (success) = user.call{gas: 3000,value: _withdrawableDividend}() (contracts/DividendPayingToken.sol#94)
State variables written after the call(s):
- withdrawnDividends[user] = withdrawnDividends[user].sub(_withdrawableDividend) (contracts/DividendPayingToken.sol#97)
Apply the check-effects-interactions pattern.

Additional information: link

Unable to verify that contract auditor is trusted: Certik, Quantstamp, Hacken, Solidity, Paladinsec, Openzeppelin, Verichains

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.

NICKEL._transfer(address,address,uint256) (contracts/NICKEL.sol#313-402) performs a multiplication on the result of a division:
-fees = amount.mul(totalFees).div(100) (contracts/NICKEL.sol#375)
-fees = fees.mul(sellFeeIncreaseFactor).div(100) (contracts/NICKEL.sol#379)
Consider ordering multiplication before division.

Additional information: link

Reentrancy in NICKEL.updateDividendTracker(address) (contracts/NICKEL.sol#149-164):
External calls:
- newDividendTracker.excludeFromDividends(address(newDividendTracker)) (contracts/NICKEL.sol#156)
- newDividendTracker.excludeFromDividends(address(this)) (contracts/NICKEL.sol#157)
- newDividendTracker.excludeFromDividends(owner()) (contracts/NICKEL.sol#158)
- newDividendTracker.excludeFromDividends(address(uniswapV2Router)) (contracts/NICKEL.sol#159)
State variables written after the call(s):
- dividendTracker = newDividendTracker (contracts/NICKEL.sol#163)
Apply the check-effects-interactions pattern.

Additional information: link

NICKEL._transfer(address,address,uint256).iterations (contracts/NICKEL.sol#395) is a local variable never initialized
NICKEL._transfer(address,address,uint256).claims (contracts/NICKEL.sol#395) is a local variable never initialized
NICKEL._transfer(address,address,uint256).lastProcessedIndex (contracts/NICKEL.sol#395) 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

NICKEL.claim() (contracts/NICKEL.sol#281-283) ignores return value by dividendTracker.processAccount(msg.sender,false) (contracts/NICKEL.sol#282)
NICKEL._transfer(address,address,uint256) (contracts/NICKEL.sol#313-402) ignores return value by dividendTracker.process(gas) (contracts/NICKEL.sol#395-400)
NICKEL.addLiquidity(uint256,uint256) (contracts/NICKEL.sol#448-463) ignores return value by uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
Ensure that all the return values of the function calls are used.

Additional information: link

DividendPayingToken.constructor(string,string)._name (contracts/DividendPayingToken.sol#46) shadows:
- ERC20._name (contracts/ERC20.sol#43) (state variable)
DividendPayingToken.constructor(string,string)._symbol (contracts/DividendPayingToken.sol#46) shadows:
- ERC20._symbol (contracts/ERC20.sol#44) (state variable)
Rename the local variables that shadow another component.

Additional information: link

NICKEL.updateSwapTokenAmount(uint256) (contracts/NICKEL.sol#297-299) should emit an event for:
- swapTokensAtAmount = amount * (10 ** 18) (contracts/NICKEL.sol#298)
NICKEL.updateMaxSellLimiation(uint256) (contracts/NICKEL.sol#301-303) should emit an event for:
- maxSellTransactionAmount = amount * (10 ** 18) (contracts/NICKEL.sol#302)
Emit an event for critical parameter changes.

Additional information: link

DividendPayingToken._withdrawDividendOfUser(address) (contracts/DividendPayingToken.sol#89-105) has external calls inside a loop: (success) = user.call{gas: 3000,value: _withdrawableDividend}() (contracts/DividendPayingToken.sol#94)
Favor pull over push strategy for external calls.

Additional information: link

Variable 'NICKEL._transfer(address,address,uint256).claims (contracts/NICKEL.sol#395)' in NICKEL._transfer(address,address,uint256) (contracts/NICKEL.sol#313-402) potentially used before declaration: ProcessedDividendTracker(iterations,claims,lastProcessedIndex,true,gas,tx.origin) (contracts/NICKEL.sol#396)
Variable 'NICKEL._transfer(address,address,uint256).iterations (contracts/NICKEL.sol#395)' in NICKEL._transfer(address,address,uint256) (contracts/NICKEL.sol#313-402) potentially used before declaration: ProcessedDividendTracker(iterations,claims,lastProcessedIndex,true,gas,tx.origin) (contracts/NICKEL.sol#396)
Variable 'NICKEL._transfer(address,address,uint256).lastProcessedIndex (contracts/NICKEL.sol#395)' in NICKEL._transfer(address,address,uint256) (contracts/NICKEL.sol#313-402) potentially used before declaration: ProcessedDividendTracker(iterations,claims,lastProcessedIndex,true,gas,tx.origin) (contracts/NICKEL.sol#396)
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 NICKEL._transfer(address,address,uint256) (contracts/NICKEL.sol#313-402):
External calls:
- swapAndLiquify(swapTokens) (contracts/NICKEL.sol#358)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
- swapAndSendDividends(sellTokens) (contracts/NICKEL.sol#361)
- (success) = address(dividendTracker).call{value: dividends}() (contracts/NICKEL.sol#478)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
External calls sending eth:
- swapAndLiquify(swapTokens) (contracts/NICKEL.sol#358)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
- swapAndSendDividends(sellTokens) (contracts/NICKEL.sol#361)
- (success) = address(dividendTracker).call{value: dividends}() (contracts/NICKEL.sol#478)
State variables written after the call(s):
- swapAndSendDividends(sellTokens) (contracts/NICKEL.sol#361)
- _allowances[owner][spender] = amount (contracts/ERC20.sol#287)
Reentrancy in NICKEL.constructor() (contracts/NICKEL.sol#94-143):
External calls:
- _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (contracts/NICKEL.sol#112-113)
State variables written after the call(s):
- uniswapV2Pair = _uniswapV2Pair (contracts/NICKEL.sol#116)
- uniswapV2Router = _uniswapV2Router (contracts/NICKEL.sol#115)
Reentrancy in NICKEL.constructor() (contracts/NICKEL.sol#94-143):
External calls:
- _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (contracts/NICKEL.sol#112-113)
- _setAutomatedMarketMakerPair(_uniswapV2Pair,true) (contracts/NICKEL.sol#118)
- dividendTracker.excludeFromDividends(pair) (contracts/NICKEL.sol#198)
- dividendTracker.excludeFromDividends(address(dividendTracker)) (contracts/NICKEL.sol#121)
- dividendTracker.excludeFromDividends(address(this)) (contracts/NICKEL.sol#122)
- dividendTracker.excludeFromDividends(owner()) (contracts/NICKEL.sol#123)
- dividendTracker.excludeFromDividends(address(_uniswapV2Router)) (contracts/NICKEL.sol#124)
State variables written after the call(s):
- _mint(owner(),77000000 * (10 ** 18)) (contracts/NICKEL.sol#142)
- _balances[account] = _balances[account].add(amount) (contracts/ERC20.sol#241)
- excludeFromFees(liquidityWallet,true) (contracts/NICKEL.sol#127)
- _isExcludedFromFees[account] = excluded (contracts/NICKEL.sol#174)
- excludeFromFees(marketingWallet,true) (contracts/NICKEL.sol#128)
- _isExcludedFromFees[account] = excluded (contracts/NICKEL.sol#174)
- excludeFromFees(address(this),true) (contracts/NICKEL.sol#129)
- _isExcludedFromFees[account] = excluded (contracts/NICKEL.sol#174)
- _mint(owner(),77000000 * (10 ** 18)) (contracts/NICKEL.sol#142)
- _totalSupply = _totalSupply.add(amount) (contracts/ERC20.sol#240)
- canTransferBeforeTradingIsEnabled[owner()] = true (contracts/NICKEL.sol#132)
- canTransferBeforeTradingIsEnabled[marketingWallet] = true (contracts/NICKEL.sol#133)
- canTransferBeforeTradingIsEnabled[liquidityWallet] = true (contracts/NICKEL.sol#134)
- canTransferBeforeTradingIsEnabled[0xA5025FABA6E70B84F74e9b1113e5F7F4E7f4859f] = true (contracts/NICKEL.sol#135)
- canTransferBeforeTradingIsEnabled[0x5d6573e62E3688E40c1fC36e01B155Fb0006F432] = true (contracts/NICKEL.sol#136)
Reentrancy in NICKELDividendTracker.processAccount(address,bool) (contracts/NICKEL.sol#680-690):
External calls:
- amount = _withdrawDividendOfUser(account) (contracts/NICKEL.sol#681)
- (success) = user.call{gas: 3000,value: _withdrawableDividend}() (contracts/DividendPayingToken.sol#94)
State variables written after the call(s):
- lastClaimTimes[account] = block.timestamp (contracts/NICKEL.sol#684)
Reentrancy in NICKEL.swapAndLiquify(uint256) (contracts/NICKEL.sol#404-425):
External calls:
- swapTokensForEth(half) (contracts/NICKEL.sol#416)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
- addLiquidity(otherHalf,newBalance) (contracts/NICKEL.sol#422)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
External calls sending eth:
- addLiquidity(otherHalf,newBalance) (contracts/NICKEL.sol#422)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
State variables written after the call(s):
- addLiquidity(otherHalf,newBalance) (contracts/NICKEL.sol#422)
- _allowances[owner][spender] = amount (contracts/ERC20.sol#287)
Apply the check-effects-interactions pattern.

Additional information: link

Reentrancy in NICKEL._setAutomatedMarketMakerPair(address,bool) (contracts/NICKEL.sol#193-202):
External calls:
- dividendTracker.excludeFromDividends(pair) (contracts/NICKEL.sol#198)
Event emitted after the call(s):
- SetAutomatedMarketMakerPair(pair,value) (contracts/NICKEL.sol#201)
Reentrancy in NICKEL._transfer(address,address,uint256) (contracts/NICKEL.sol#313-402):
External calls:
- swapAndLiquify(swapTokens) (contracts/NICKEL.sol#358)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
- swapAndSendDividends(sellTokens) (contracts/NICKEL.sol#361)
- (success) = address(dividendTracker).call{value: dividends}() (contracts/NICKEL.sol#478)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
External calls sending eth:
- swapAndLiquify(swapTokens) (contracts/NICKEL.sol#358)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
- swapAndSendDividends(sellTokens) (contracts/NICKEL.sol#361)
- (success) = address(dividendTracker).call{value: dividends}() (contracts/NICKEL.sol#478)
Event emitted after the call(s):
- Approval(owner,spender,amount) (contracts/ERC20.sol#288)
- swapAndSendDividends(sellTokens) (contracts/NICKEL.sol#361)
- SendDividends(tokens,dividends) (contracts/NICKEL.sol#481)
- swapAndSendDividends(sellTokens) (contracts/NICKEL.sol#361)
- Transfer(sender,recipient,amount) (contracts/ERC20.sol#223)
- super._transfer(from,to,amount) (contracts/NICKEL.sol#387)
- Transfer(sender,recipient,amount) (contracts/ERC20.sol#223)
- super._transfer(from,address(this),fees) (contracts/NICKEL.sol#384)
Reentrancy in NICKEL._transfer(address,address,uint256) (contracts/NICKEL.sol#313-402):
External calls:
- swapAndLiquify(swapTokens) (contracts/NICKEL.sol#358)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
- swapAndSendDividends(sellTokens) (contracts/NICKEL.sol#361)
- (success) = address(dividendTracker).call{value: dividends}() (contracts/NICKEL.sol#478)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
- dividendTracker.setBalance(address(from),balanceOf(from)) (contracts/NICKEL.sol#389)
- dividendTracker.setBalance(address(to),balanceOf(to)) (contracts/NICKEL.sol#390)
- dividendTracker.process(gas) (contracts/NICKEL.sol#395-400)
External calls sending eth:
- swapAndLiquify(swapTokens) (contracts/NICKEL.sol#358)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
- swapAndSendDividends(sellTokens) (contracts/NICKEL.sol#361)
- (success) = address(dividendTracker).call{value: dividends}() (contracts/NICKEL.sol#478)
Event emitted after the call(s):
- ProcessedDividendTracker(iterations,claims,lastProcessedIndex,true,gas,tx.origin) (contracts/NICKEL.sol#396)
Reentrancy in NICKEL.constructor() (contracts/NICKEL.sol#94-143):
External calls:
- _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (contracts/NICKEL.sol#112-113)
- _setAutomatedMarketMakerPair(_uniswapV2Pair,true) (contracts/NICKEL.sol#118)
- dividendTracker.excludeFromDividends(pair) (contracts/NICKEL.sol#198)
Event emitted after the call(s):
- SetAutomatedMarketMakerPair(pair,value) (contracts/NICKEL.sol#201)
- _setAutomatedMarketMakerPair(_uniswapV2Pair,true) (contracts/NICKEL.sol#118)
Reentrancy in NICKEL.constructor() (contracts/NICKEL.sol#94-143):
External calls:
- _uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this),_uniswapV2Router.WETH()) (contracts/NICKEL.sol#112-113)
- _setAutomatedMarketMakerPair(_uniswapV2Pair,true) (contracts/NICKEL.sol#118)
- dividendTracker.excludeFromDividends(pair) (contracts/NICKEL.sol#198)
- dividendTracker.excludeFromDividends(address(dividendTracker)) (contracts/NICKEL.sol#121)
- dividendTracker.excludeFromDividends(address(this)) (contracts/NICKEL.sol#122)
- dividendTracker.excludeFromDividends(owner()) (contracts/NICKEL.sol#123)
- dividendTracker.excludeFromDividends(address(_uniswapV2Router)) (contracts/NICKEL.sol#124)
Event emitted after the call(s):
- ExcludeFromFees(account,excluded) (contracts/NICKEL.sol#176)
- excludeFromFees(liquidityWallet,true) (contracts/NICKEL.sol#127)
- ExcludeFromFees(account,excluded) (contracts/NICKEL.sol#176)
- excludeFromFees(address(this),true) (contracts/NICKEL.sol#129)
- ExcludeFromFees(account,excluded) (contracts/NICKEL.sol#176)
- excludeFromFees(marketingWallet,true) (contracts/NICKEL.sol#128)
- Transfer(address(0),account,amount) (contracts/ERC20.sol#242)
- _mint(owner(),77000000 * (10 ** 18)) (contracts/NICKEL.sol#142)
Reentrancy in NICKELDividendTracker.processAccount(address,bool) (contracts/NICKEL.sol#680-690):
External calls:
- amount = _withdrawDividendOfUser(account) (contracts/NICKEL.sol#681)
- (success) = user.call{gas: 3000,value: _withdrawableDividend}() (contracts/DividendPayingToken.sol#94)
Event emitted after the call(s):
- Claim(account,amount,automatic) (contracts/NICKEL.sol#685)
Reentrancy in NICKEL.processDividendTracker(uint256) (contracts/NICKEL.sol#276-279):
External calls:
- (iterations,claims,lastProcessedIndex) = dividendTracker.process(gas) (contracts/NICKEL.sol#277)
Event emitted after the call(s):
- ProcessedDividendTracker(iterations,claims,lastProcessedIndex,false,gas,tx.origin) (contracts/NICKEL.sol#278)
Reentrancy in NICKEL.swapAndLiquify(uint256) (contracts/NICKEL.sol#404-425):
External calls:
- swapTokensForEth(half) (contracts/NICKEL.sol#416)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
- addLiquidity(otherHalf,newBalance) (contracts/NICKEL.sol#422)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
External calls sending eth:
- addLiquidity(otherHalf,newBalance) (contracts/NICKEL.sol#422)
- uniswapV2Router.addLiquidityETH{value: ethAmount}(address(this),tokenAmount,0,0,liquidityWallet,block.timestamp) (contracts/NICKEL.sol#454-461)
Event emitted after the call(s):
- Approval(owner,spender,amount) (contracts/ERC20.sol#288)
- addLiquidity(otherHalf,newBalance) (contracts/NICKEL.sol#422)
- SwapAndLiquify(half,newBalance,otherHalf) (contracts/NICKEL.sol#424)
Reentrancy in NICKEL.swapAndSendDividends(uint256) (contracts/NICKEL.sol#475-483):
External calls:
- swapTokensForEth(tokens) (contracts/NICKEL.sol#476)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
- (success) = address(dividendTracker).call{value: dividends}() (contracts/NICKEL.sol#478)
External calls sending eth:
- (success) = address(dividendTracker).call{value: dividends}() (contracts/NICKEL.sol#478)
Event emitted after the call(s):
- SendDividends(tokens,dividends) (contracts/NICKEL.sol#481)
Reentrancy in NICKEL.swapAndSendMarketing(uint256) (contracts/NICKEL.sol#465-473):
External calls:
- swapTokensForEth(tokens) (contracts/NICKEL.sol#466)
- uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(tokenAmount,0,path,address(this),block.timestamp) (contracts/NICKEL.sol#438-444)
- (success) = marketingWallet.call{value: marketingBNB}() (contracts/NICKEL.sol#468)
External calls sending eth:
- (success) = marketingWallet.call{value: marketingBNB}() (contracts/NICKEL.sol#468)
Event emitted after the call(s):
- SendMarketingBNB(tokens,marketingBNB) (contracts/NICKEL.sol#471)
Reentrancy in NICKEL.updateDividendTracker(address) (contracts/NICKEL.sol#149-164):
External calls:
- newDividendTracker.excludeFromDividends(address(newDividendTracker)) (contracts/NICKEL.sol#156)
- newDividendTracker.excludeFromDividends(address(this)) (contracts/NICKEL.sol#157)
- newDividendTracker.excludeFromDividends(owner()) (contracts/NICKEL.sol#158)
- newDividendTracker.excludeFromDividends(address(uniswapV2Router)) (contracts/NICKEL.sol#159)
Event emitted after the call(s):
- UpdateDividendTracker(newAddress,address(dividendTracker)) (contracts/NICKEL.sol#161)
Apply the check-effects-interactions pattern.

Additional information: link

NICKELDividendTracker.getAccount(address) (contracts/NICKEL.sol#544-587) uses timestamp for comparisons
Dangerous comparisons:
- nextClaimTime > block.timestamp (contracts/NICKEL.sol#584-586)
NICKELDividendTracker.canAutoClaim(uint256) (contracts/NICKEL.sol#608-614) uses timestamp for comparisons
Dangerous comparisons:
- lastClaimTime > block.timestamp (contracts/NICKEL.sol#609)
- block.timestamp.sub(lastClaimTime) >= claimWait (contracts/NICKEL.sol#613)
Avoid relying on block.timestamp.

Additional information: link

Context._msgData() (contracts/Context.sol#20-23) is never used and should be removed
DividendPayingToken._transfer(address,address,uint256) (contracts/DividendPayingToken.sol#145-151) is never used and should be removed
NICKEL.swapAndSendMarketing(uint256) (contracts/NICKEL.sol#465-473) is never used and should be removed
SafeMath.mod(uint256,uint256) (contracts/SafeMath.sol#126-128) is never used and should be removed
SafeMath.mod(uint256,uint256,string) (contracts/SafeMath.sol#142-145) is never used and should be removed
SafeMathInt.abs(int256) (contracts/SafeMathInt.sol#82-85) is never used and should be removed
SafeMathInt.div(int256,int256) (contracts/SafeMathInt.sol#53-59) is never used and should be removed
SafeMathInt.mul(int256,int256) (contracts/SafeMathInt.sol#41-48) is never used and should be removed
Remove unused functions.

Additional information: link

Pragma version^0.6.2 (contracts/Context.sol#3) allows old versions
Pragma version^0.6.2 (contracts/DividendPayingToken.sol#3) allows old versions
Pragma version^0.6.2 (contracts/DividendPayingTokenInterface.sol#3) allows old versions
Pragma version^0.6.2 (contracts/DividendPayingTokenOptionalInterface.sol#3) allows old versions
Pragma version^0.6.2 (contracts/ERC20.sol#3) allows old versions
Pragma version^0.6.2 (contracts/IERC20.sol#3) allows old versions
Pragma version^0.6.2 (contracts/IERC20Metadata.sol#3) allows old versions
Pragma version^0.6.2 (contracts/IUniswapV2Factory.sol#3) allows old versions
Pragma version^0.6.2 (contracts/IUniswapV2Pair.sol#3) allows old versions
Pragma version^0.6.2 (contracts/IUniswapV2Router.sol#3) allows old versions
Pragma version^0.6.2 (contracts/IterableMapping.sol#2) allows old versions
Pragma version^0.6.2 (contracts/NICKEL.sol#3) allows old versions
Pragma version^0.6.2 (contracts/Ownable.sol#1) allows old versions
Pragma version^0.6.2 (contracts/SafeMath.sol#3) allows old versions
Pragma version^0.6.2 (contracts/SafeMathInt.sol#28) allows old versions
Pragma version^0.6.2 (contracts/SafeMathUint.sol#3) allows old versions
solc-0.6.2 is not recommended for deployment
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) (contracts/DividendPayingToken.sol#89-105):
- (success) = user.call{gas: 3000,value: _withdrawableDividend}() (contracts/DividendPayingToken.sol#94)
Low level call in NICKEL.swapAndSendMarketing(uint256) (contracts/NICKEL.sol#465-473):
- (success) = marketingWallet.call{value: marketingBNB}() (contracts/NICKEL.sol#468)
Low level call in NICKEL.swapAndSendDividends(uint256) (contracts/NICKEL.sol#475-483):
- (success) = address(dividendTracker).call{value: dividends}() (contracts/NICKEL.sol#478)
Avoid low-level calls. Check the call success. If the call is meant for a contract, check for code existence

Additional information: link

Parameter DividendPayingToken.dividendOf(address)._owner (contracts/DividendPayingToken.sol#111) is not in mixedCase
Parameter DividendPayingToken.withdrawableDividendOf(address)._owner (contracts/DividendPayingToken.sol#118) is not in mixedCase
Parameter DividendPayingToken.withdrawnDividendOf(address)._owner (contracts/DividendPayingToken.sol#125) is not in mixedCase
Parameter DividendPayingToken.accumulativeDividendOf(address)._owner (contracts/DividendPayingToken.sol#135) is not in mixedCase
Constant DividendPayingToken.magnitude (contracts/DividendPayingToken.sol#26) is not in UPPER_CASE_WITH_UNDERSCORES
Function IUniswapV2Pair.DOMAIN_SEPARATOR() (contracts/IUniswapV2Pair.sol#20) is not in mixedCase
Function IUniswapV2Pair.PERMIT_TYPEHASH() (contracts/IUniswapV2Pair.sol#21) is not in mixedCase
Function IUniswapV2Pair.MINIMUM_LIQUIDITY() (contracts/IUniswapV2Pair.sol#38) is not in mixedCase
Function IUniswapV2Router01.WETH() (contracts/IUniswapV2Router.sol#7) is not in mixedCase
Parameter NICKEL.setBotAddress(address,bool)._botAddress (contracts/NICKEL.sol#305) is not in mixedCase
Parameter NICKEL.transferEnableAddresses(address,bool)._transferAddress (contracts/NICKEL.sol#309) is not in mixedCase
Variable NICKEL.BNBRewardsFee (contracts/NICKEL.sol#31) is not in mixedCase
Parameter NICKELDividendTracker.getAccount(address)._account (contracts/NICKEL.sol#544) is not in mixedCase
Follow the Solidity naming convention.

Additional information: link

Redundant expression "this (contracts/Context.sol#21)" inContext (contracts/Context.sol#15-25)
Remove redundant statements if they congest code but offer no value.

Additional information: link

Variable IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountADesired (contracts/IUniswapV2Router.sol#12) is too similar to IUniswapV2Router01.addLiquidity(address,address,uint256,uint256,uint256,uint256,address,uint256).amountBDesired (contracts/IUniswapV2Router.sol#13)
Variable DividendPayingToken._withdrawDividendOfUser(address)._withdrawableDividend (contracts/DividendPayingToken.sol#90) is too similar to NICKELDividendTracker.getAccount(address).withdrawableDividends (contracts/NICKEL.sol#549)
Prevent variables from having similar names.

Additional information: link

NICKEL.constructor() (contracts/NICKEL.sol#94-143) uses literals with too many digits:
- _mint(owner(),77000000 * (10 ** 18)) (contracts/NICKEL.sol#142)
NICKEL.updateGasForProcessing(uint256) (contracts/NICKEL.sol#219-224) uses literals with too many digits:
- require(bool,string)(newValue >= 200000 && newValue <= 500000,NICKEL: gasForProcessing must be between 200,000 and 500,000) (contracts/NICKEL.sol#220)
NICKEL.slitherConstructorVariables() (contracts/NICKEL.sol#13-484) uses literals with too many digits:
- gasForProcessing = 300000 (contracts/NICKEL.sol#40)
NICKELDividendTracker.getAccountAtIndex(uint256) (contracts/NICKEL.sol#589-606) uses literals with too many digits:
- (0x0000000000000000000000000000000000000000,- 1,- 1,0,0,0,0,0) (contracts/NICKEL.sol#600)
Use: Ether suffix, Time suffix, or The scientific notation

Additional information: link

SafeMathInt.MAX_INT256 (contracts/SafeMathInt.sol#36) is never used in SafeMathInt (contracts/SafeMathInt.sol#34-93)
Remove unused state variables.

Additional information: link

NICKEL.sellFeeIncreaseFactor (contracts/NICKEL.sol#37) should be constant
Add the constant attributes to state variables that never change.

Additional information: link

withdrawDividend() should be declared external:
- DividendPayingToken.withdrawDividend() (contracts/DividendPayingToken.sol#83-85)
- NICKELDividendTracker.withdrawDividend() (contracts/NICKEL.sol#515-517)
dividendOf(address) should be declared external:
- DividendPayingToken.dividendOf(address) (contracts/DividendPayingToken.sol#111-113)
withdrawnDividendOf(address) should be declared external:
- DividendPayingToken.withdrawnDividendOf(address) (contracts/DividendPayingToken.sol#125-127)
name() should be declared external:
- ERC20.name() (contracts/ERC20.sol#63-65)
symbol() should be declared external:
- ERC20.symbol() (contracts/ERC20.sol#71-73)
decimals() should be declared external:
- ERC20.decimals() (contracts/ERC20.sol#88-90)
transfer(address,uint256) should be declared external:
- ERC20.transfer(address,uint256) (contracts/ERC20.sol#114-117)
allowance(address,address) should be declared external:
- ERC20.allowance(address,address) (contracts/ERC20.sol#122-124)
approve(address,uint256) should be declared external:
- ERC20.approve(address,uint256) (contracts/ERC20.sol#133-136)
transferFrom(address,address,uint256) should be declared external:
- ERC20.transferFrom(address,address,uint256) (contracts/ERC20.sol#151-159)
increaseAllowance(address,uint256) should be declared external:
- ERC20.increaseAllowance(address,uint256) (contracts/ERC20.sol#173-176)
decreaseAllowance(address,uint256) should be declared external:
- ERC20.decreaseAllowance(address,uint256) (contracts/ERC20.sol#192-195)
get(IterableMapping.Map,address) should be declared external:
- IterableMapping.get(IterableMapping.Map,address) (contracts/IterableMapping.sol#13-15)
getIndexOfKey(IterableMapping.Map,address) should be declared external:
- IterableMapping.getIndexOfKey(IterableMapping.Map,address) (contracts/IterableMapping.sol#17-22)
getKeyAtIndex(IterableMapping.Map,uint256) should be declared external:
- IterableMapping.getKeyAtIndex(IterableMapping.Map,uint256) (contracts/IterableMapping.sol#24-26)
size(IterableMapping.Map) should be declared external:
- IterableMapping.size(IterableMapping.Map) (contracts/IterableMapping.sol#30-32)
updateDividendTracker(address) should be declared external:
- NICKEL.updateDividendTracker(address) (contracts/NICKEL.sol#149-164)
updateUniswapV2Router(address) should be declared external:
- NICKEL.updateUniswapV2Router(address) (contracts/NICKEL.sol#166-170)
excludeMultipleAccountsFromFees(address[],bool) should be declared external:
- NICKEL.excludeMultipleAccountsFromFees(address[],bool) (contracts/NICKEL.sol#179-185)
setAutomatedMarketMakerPair(address,bool) should be declared external:
- NICKEL.setAutomatedMarketMakerPair(address,bool) (contracts/NICKEL.sol#187-191)
updateLiquidityWallet(address) should be declared external:
- NICKEL.updateLiquidityWallet(address) (contracts/NICKEL.sol#205-210)
updateMarketingWallet(address) should be declared external:
- NICKEL.updateMarketingWallet(address) (contracts/NICKEL.sol#212-217)
updateGasForProcessing(uint256) should be declared external:
- NICKEL.updateGasForProcessing(uint256) (contracts/NICKEL.sol#219-224)
isExcludedFromFees(address) should be declared external:
- NICKEL.isExcludedFromFees(address) (contracts/NICKEL.sol#238-240)
withdrawableDividendOf(address) should be declared external:
- NICKEL.withdrawableDividendOf(address) (contracts/NICKEL.sol#242-244)
dividendTokenBalanceOf(address) should be declared external:
- NICKEL.dividendTokenBalanceOf(address) (contracts/NICKEL.sol#246-248)
setBotAddress(address,bool) should be declared external:
- NICKEL.setBotAddress(address,bool) (contracts/NICKEL.sol#305-307)
transferEnableAddresses(address,bool) should be declared external:
- NICKEL.transferEnableAddresses(address,bool) (contracts/NICKEL.sol#309-311)
getAccountAtIndex(uint256) should be declared external:
- NICKELDividendTracker.getAccountAtIndex(uint256) (contracts/NICKEL.sol#589-606)
process(uint256) should be declared external:
- NICKELDividendTracker.process(uint256) (contracts/NICKEL.sol#633-678)
renounceOwnership() should be declared external:
- Ownable.renounceOwnership() (contracts/Ownable.sol#43-46)
transferOwnership(address) should be declared external:
- Ownable.transferOwnership(address) (contracts/Ownable.sol#52-56)
Use the external attribute for functions never called from the contract.

Additional information: link

Average PancakeSwap trading volume, liqudity, number of swaps are extremely low. Token seems to be dead.

Number of Binance Smart Chain (BSC) token holders is low.

Token is deployed only at one blockchain

Token has only one trading pair

Unable to find PancakeSwap trading pair to compute liquidity.

Unable to find PancakeSwap trading pair to compute volume.

Unable to find PancakeSwap trading pair to compute number of swaps.

Token was delisted (assigned to inactive / untracked listing) from CoinMarketCap

Additional information: link

Unable to find token on CoinHunt

Additional information: link

Unable to find code repository for the project

Young tokens have high risks of price dump / death

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

Token has no active CoinMarketCap listing / rank

Young tokens have high risks of price dump / death

Young tokens have high risks of price dump / death

Token has relatively low CoinGecko rank