Using cs-cart in many websites

Can i use one cs-cart for many different e-shops? is there any special license i have to buy?

Yes, you will need the ultimate edition.

Im not asking about storefronts or something like that. im asking to be able to create as much e-shops i can for different clients without the need to buy again the cs-cart

cs-cart is licensed “per domain”. So your first purchase is retail pricing and others get a discount.