Refresh all Datasets in Workspace via restAPI

I guess I was just mistaken.
Maybe there never was one API that refreshed all datasets in a given workspace at once.

One would need to determine the list of datasets in the workspace with "Datasets - Get Datasets In Group" API, then loop over the list and trigger a refresh one by one.
PowerShell example may be found here:
https://technovert.com/blog/refreshing-all-datasets-in-power-bi-using-rest-api/