I want to know, if there is an api that supports to post/publish automatically a picture as a instagram story.
Currently I am using the instagram4j api that works perfectly to publish pictures in the regular feed, but I want to be able to plan that every day a picture is published as a story.
Is there such an api?
Sounds like this is something other developers have requested on the GitHub repo issues section for the Instagram4j API.
https://github.com/brunocvcunha/instagram4j/issues/42
Might be worth following this and +1 ing the issue.
As off now, Instagram's official API doesn't allow this unfortunately.
An alternative might be to check this repo on GitHub. https://github.com/mgp25/Instagram-API/blob/master/src/Request/Story.php
I haven't tested it myself but that might be something worth considering.