That I know, thanks. Why I wanted this is I have the wallet encrypted and dont want to bother trying to find the password if the wallet is empty. lazy I guess...
when you have a wallet with a third party (blockchain.com web wallet) then things such as a wallet-id are only defined internally in their service. so your only option is to go to the same centralized third party and use their services to get whatever you want (addresses, balances, private keys, create transactions,...).