I am trying to find a public or unofficial Instagram API to build a downloader. There are many services that can already fetch videos, photos, Stories and Reels, so the needed endpoints clearly exist. The real challenge is understanding where they are and how to access them reliably.

If anyone has experience with this, I would really appreciate any guidance. Even a list of working services that use this type of API would help, since I could try to reverse engineer how they handle the requests.