How to call smart contract methods without abi?

Question

I need to call a smart contract from python, but it is not verified. Since this is not my contract, I cannot verify it. How to call the smart contract methods through python in this case? Smart contract: https://explorer.dogechain.dog/address/0x4aE2bD0666c76C7f39311b9B3e39b53C8D7C43Ea/contracts#address-tabs

Answer 1

If you can work out what is being sent you can recraft it and send the raw data with a normal transaction, just steal the function sig and pad your values correctly.

Example raw transfer:

In your case you can see they have exactInputSingle(), so you can guess that and other similar Uniswap functions are also in the multicalls, search signatures in the 4byte directory and break the calls down:

You could also write your own abi for that function or take from a contract with the same function and arguments. Look up sig/arguments on 4byte directory.

Have done this with an unverified farming contract that was just passing pid, amount and address to withdraw.

Something like: