Are you wanting the API workflow to return the thing back to the page workflow?
A recurring or scheduled API workflow runs completely separately from the page, and when it is done it has no way to know which page to return data to, if the page is even open at that time.
What you are probably looking for is to use the API Connector to define an API call to your own API Workflow endpoint, as if it is an external API. Then the page workflow calls via the API Connector, waits for it to finish, and can use the returned value.
Yes, my purpose simply to call external API, get data on the list then create thing on bubble database, i dont need it show to any page. Can you see my API endpoint and Recurring Event to see if I can handle my task with enpoint and recurring event.