what is the purpose of writing a smart contract to use the uniswap/pancakeswap router when there's the sdk that can be used from frontend

I didn't udnerstand

who said that you must write a smart contract to interact with uniswap?

thank you so much for replying

I see some doing that,

Im wondering why

like who?

or others contracts like tokens

yeah contracts like tokens

ahhh ok

then why you mentioned the sdk?

sdk is for offchain things

my bad.

depends
do you plan to add liquidity in your dex?

if you make a dex only for 1 token I don't see any advantage
use pancakeswap that is battle-tested

yes please

ooohhh ok

but router has a check too

are you talking about feeTo ?

or normal lp holders fee?

on uniswap walktrough it just says this

https://ethereum.org/en/developers/tutorials/uniswap-v2-annotated-code/#:~:text=In%20Uniswap%202.0%20traders%20pay,goes%20to%20the%20liquidity%20providers.