Hi @cinnamon, welcome to the Pickaxe community 
Yes, you can define access rules at the embed level.
In the Edit Embed screen, under Access, you can turn on Enable Access Control and then choose the path for that specific embed, such as a Public Access Group and/or Member Access Groups. That lets you decide things like how many free uses a guest gets, and what should happen once those uses run out, for example prompting them to sign up or upgrade.
The key thing is that each standalone embed follows its own predefined access path. So you can control limits and upgrade flow per embed there.
Kindly click here for additional video tutorial : Access Overview | Pickaxe Learn
If your goal is to manage multiple Pickaxes together under one shared experience, a Portal is usually the better setup. A portal is a collection of Pickaxes/agents where you can group tools, lock products, and define offers more centrally. A direct embed is just one standalone Pickaxe.
So in practice:
As per your specific query:
We would like somehow to achieve having one usage limit per user for all the deployments together in the same workspace. This means that each user will have 100 questions for all the Pickaxes in the same workspace. He may use 10 questions in one Pickaxe and 90 questions to another but the total questions will be up to 100.
Yes, this is possible but only when users are identified (logged in).
You’ll need to use a Member Access Group with 100 uses. That way, each user gets one shared pool of 100 uses across all Pickaxes in the workspace.
So they can use:
This won’t work properly for anonymous iframe users, since each embed tracks usage separately.
Hope this helps clarify it.