Hi Sagar - sorry for the delay.
Have you checked out our
"First Shipment" tutorial yet? It shows you how to get a Rate with your Shipment information.
Unfortunately you can't get Rates just based on address information. The cost of a Shipment varies widely based on the dimension and weight of the package, therefore you must include an Parcel Object with that information.
However, we do have a object_purpose attribute on the Address object that allows you to generate a Rate with limited address information. You'd only need country/city/zip (though sometimes street, depending on the carrier).
Hope that's helpful!