Cardano staking now available at Bitfinex.
AMBCrypto reports that annual rewards can be high as 4.3%
This is great news. making your own staking in Cardano wallets is not always possible to receive rewards. And there will be a fixed percentage on the Bitfinex exchange.
For staking purposes I will only stake my coins if it will pay 1-5% which I think is alot for doing nothing at all but keep your wallet open.
I didn't understand what are you asking there is no need to keep open the wallet for staking purpose. Especially exchange this process is more smooth and you will get reward on base of your staking tokens.