We want to use as a web page title something similar to: "enter tournaments, pay zero, win prizes". I feel that "pay zero" is incorrect and when I searched in google I see that the word zero in this sense is mostly used as an adjective for the following word like in "pay zero taxes" and probably this is why saying "pay zero" feels to me like a cut off sentence.
So the question is: is using "pay zero" correct in the context I described? If not than what could replace it to preserve the meaning? "pay nothing"?