Last week I implemented history call to retrieve all old versions of an element, version call to retrieve a specific version of the element and added possibility to specify version number for element in multi fetch call, i.e.:
Unfortunately, current and history tables contains the same data, so currently it’s not possible to get all element’s history or some old version of element.
Next week I will implement relations for element and ways for node calls. So I will finish all read-only elements calls.