Hello, you need to pay to apply for a patent. If you apply by yourself, you only need to pay the official fee. The official fee depends on what patent you apply for, which is divided into: invention patent and utility model patent. Unlike design patents, the official fees for these three types are different! If you find an agency, then you have to pay a certain agency fee to the agency in addition to the official fee, but it saves you a lot of trouble. For example, you may not necessarily be able to write application materials if you apply by yourself. It’s quite troublesome, and if you don’t do it well, you won’t be able to apply! My suggestion is to find an agency that is more reliable. Of course, the agency should also find one with relatively high qualifications! Like us! Haha, generally if your application is unsuccessful, your agency fee will not be charged! Thanks!