Clarification on per caller topic eligibility condition

[stguav]

The explainer currently states

Not every API caller will receive a topic. Only callers that observed the user visit a site about the topic in question within the past three weeks can receive the topic.

Could you clarify if that should read the past three completed epochs? Or is it literally the past three weeks? In which case, the eligibility window won't align with the topics epochs being returned?

[xyaoinum]

Hi @stguav ,
It’s literally the past 3 weeks, so it won’t 100% align with the epochs. But also note that:

• The "past 3 weeks" is a fixed period applying to topics derived from each epoch: it’s the past 3 weeks from each epoch’s topics aggregation time, not the API calling time. This ensures that the returned topic is sticky to the epoch & top-level-site.
• Since epoch topics aggregation occurs per week (+ flex time), the window won’t go beyond 3 epochs.

[stguav]

Thanks @xyaoinum ,

That makes sense. Just confirming: the eligibility period for each epoch is the three weeks prior to the epoch's completion? Is that correct?

[xyaoinum]

Just confirming: the eligibility period for each epoch is the three weeks prior to the epoch's completion? Is that correct?

Yes. This is correct.