Facebook yesterday launched an Instagram Content Publishing API, enabling Instagram Business accounts to schedule and publish posts to their Instagram Feeds from third-party platforms.
According to Facebook, the Instagram Content Publishing API supports scheduling and publishing single photo or video posts to Instagram Feed for Instagram Business accounts only.
Each Instagram Business account will be limited to 25 API-published posts within a 24-hour moving period. This rate limit will not impact other publishing methods, so an Instagram Business account may publish additional posts via the native Instagram app or Facebook Creator Studio if they max out their daily API rate limit.
Facebook says this is a product designed for businesses that want to publish content to Instagram in a planned way.