How to simulate buys/sells

How can I simulate buy and sell transactions on the ethereum mainnet?
Ideally Im looking for a way that doesnt use aany funds at all if this is possible

There are testnets for this purpose.

no testnet, I need to simulate buys and sells on the mainnet

Why exactly? You can test transactions on testnet, if it works on the testnet then this mean it will be work on the mainnet basicallyโ€ฆ

I need to simulate a sell on mainnet to check if a token is sellable or not

For the most part I could check if the function swapAndLiquidify is either true or false, but what is if they rename the function?

any suggestions anyone?