OpenSky does not have a sign-up bonus or any ongoing rewards. The main benefits of having the OpenSky are that it offers zero liability protection and reports monthly to the credit bureaus.
If you're in the market for an initial bonus, you can compare the best credit card sign-up bonuses from other cards, picked by WalletHub's editors. But keep in mind that rewards bonuses are just one of the many things to consider when deciding which credit card you should get.