Grants on RPC Function execution

I have a function that is called before User sign-up.
Is it necessary to

GRANT EXECUTE ON FUNCTION public.get_addresspoint_from_address(text, text, integer, integer) TO PUBLIC;

GRANT EXECUTE ON FUNCTION public.get_addresspoint_from_address(text, text, integer, integer) TO PUBLIC;

GRANT EXECUTE ON FUNCTION public.get_addresspoint_from_address(text, text, integer, integer) TO PUBLIC;

GRANT EXECUTE ON FUNCTION public.get_addresspoint_from_address(text, text, integer, integer) TO PUBLIC;