v131 · miscellaneous
Private Aggregation API: increase contribution limit to 100 for Protected Audience callers
Enables Protected Audience script runners to make up to 100 contributions per Private Aggregation report, compared to the current limit of 20.
concepts
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PA Contribution Limit 100
Private Aggregation limit for Protected Audience increases to 100 contributions per call.
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Per-creative reach
The motivating ad-tech case: track impressions × variants × metrics across a real auction. Pre-131 forced ad-tech to drop signals; 131+ fits.
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Contribution budget visualiser
Sliders for bidders × signals. Meter with pre-v131 and v131 thresholds. See whether your auction fits.
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Worklet script builder
Generate a generateBid() that emits N contributions. See where the cap clips and how pre-v131 vs v131 behave.
why it shipped
Private Aggregation imposes a limit on the number of histogram contributions that can be embedded in a single aggregatable report, with any additional contributions being dropped. Shared Storage callers can work around the limit by invoking another Shared Storage operation. However, Protected Audience callers have no persistent storage, so they lose their excess contributions at the end of each auction.