I need to create a Dashboard that can be used to view how many activities are assigned to each users between each projects.

To do this, I starting play with API, I already found a way to create a list or all projects and all users but i can't find a way to show all stories, task and activities in general assigned to each users.

At the end i need something like this:

User test01 is inside project A and B and currently have story "test01" and "test02" and task "task01" and "task02" etc.

there is a way to do this with the API ?