is it possible to check whether product key activated at any point?Answered

Is it possible to check whether product key activated at any point through your api?
I want to filter those key which never activated so far?

There is this:
limelm.pkey.advancedSearch&get_acts=true
But this only give last activations if present not whole history.

Is there are way to filter keys that were never activated?

Answer

No, there's no easy way to do this. Nor do we plan to add this (very niche use-case).

If some product key has 'acts_used': 0, that means that there no current activations on this key.
If it also has 'total_deacts': 0, that means that key have never been deactivated previously. Which also means that it was not previously activated.
It can be only curently activated and as it is now 'acts_used': 0 that means that it was never activated.

So keys which have 'acts_used': 0 and 'total_deacts': 0 are those who never were activated.
What do you think about this logic, do you agree?   

From the moment of activation of product key these 'acts_used': 0, 'total_deacts': 0 can not be zero anymore at the same time, only one of them can be zero. 
Both can be zero only before activation, right?

Yep, that'll work