Get versioned models using API

You're absolutely right. We'll soon add this feature.

It turns out this feature is already implemented, it just wasn't documented. To get the version with a specific tag go to:
/api/xml/MODEL_ID/TAG
/api/sql/MODEL_ID/TAG
I will update the documentation.

Can I get DIFF from two version via API ?

Can I get TAG_LIST by MODEL_ID from API?

Hmmm, You can't.

- DIFFs are not supported at this time. We're started working on it. Couldn't tell you more about timeline.
- "Getting list of tags/version for given model" I'll add ot to our TODO list.

I you have any other ideas regarding API please let us know.