Hey guys, how to implement a fee only on sell transaction ? I mean how to differentiate between buy and sell ?

You don’t

A token contract doesn’t buy or sell… it just transfers

You could check if the to address is an AMM, but there’s more than one

But does it go via the router or the pool contract?

Thanks guys, indeed that is the solution 😊.

that was my next question

I found this guys implementing a SC with 10% fees on sells only : https://bscscan.com/address/0x72b4404a20b6342ce3d8a9707316a07cbff9063d#code

But I don't understand the logic .....

the magic happens here :

if (_fromFees[sender] == true || _toFees[recipient] == true)
taxTransfer = true;

_fromFees and toFees are defined as mapping in the contract

function addFromFees(address feeAddress) public onlyOwner{
_fromFees[feeAddress] = true;
}

function addToFees(address feeAddress) public onlyOwner{
_toFees[feeAddress] = true;
}

One / both of the functions above has been called and
Router address
was passed an argument when the function was invoked

Yeah, thanks a lot buddy. According to @Plicostan we can say it is a buy when the source is Pancakeswap, I assume that _fromFees was defined with Pancakeswap router address.

thanks a lot

I will make tests and share with you

👍

If you invest in this project do watch out for this lines of codes in the _transfer
if (sender != owner() && _isFrozen)
{
revert("token is frozen");
}

u know its a buy if from is a pair
u know its a sell if to is a pair

but u dont know if its a pair 👀

usually u only know the BNB pair in constructor

but i can make a BUSD or USDT pair and it does not count as sell ;)

freezeToken() public onlyOwner

yes. that is scam

I did not, it is a very nice trick. I assume it was for deploying SC and creating LP and not be targeted by the bots. They controlled when trading was enabled. That is what I understand from the code

they renounced to ownership 😊

I don't get you bro 😊

I did not invested in the project, I am interested in they SC because they implemented a fee only on the sell, and it is very interesting

https://www.tikitoken.finance

Separated contract i think they have different taxes when buy and when sell but don't remember. I will work next week on change some stuff in this code

need audit that doesnt look like an automated report from the 1970s, if anyone can suggest

seriously though, need audit for complex token, any suggestion of competent auditors?

Hi guys, I made tests and you should deploy the contract and specicfy Pancakeswap router in addToFees function and it is working perfectly 😊