@Mateus_Lidonis said:

Hi, is there any way to filter movies by watch providers?
I know we can search which watch providers have the movie by entering the movie_id,
but I would like to filter the watch provider when searching for the movie.
For example, I would like to search only movies from 2023, with action genre and available on Netflix.

Yes, it is possible using Discover.
https://developer.themoviedb.org/reference/discover-movie

You need to inform the filter data:
primary_release_year = 2023 (Your requested year)
watch_region = BR (Brazil in my example)
with_genres = 28 (Action ID)
with_watch_providers = 8 (Netflix)

Find Genre IDs here:
https://developer.themoviedb.org/reference/genre-movie-list
Find the WatchProviders IDs here:
https://developer.themoviedb.org/reference/watch-providers-movie-list

The API Request will look like this in this example:

https://api.themoviedb.org/3/discover/movie?api_key=THE_KEY&sort_by=popularity.desc&language=pt-BR&page=1&primary_release_year=2023&watch_region=BR&with_genres=28&with_watch_providers=8