To provide critical features that the web relies on, the Private Aggregation API has been built for aggregating and reporting on cross-site data in a privacy-preserving manner. With Private Aggregation, generate aggregate data reports using data from Protected Audience and cross-site data from Shared Storage.
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Use cases with Shared Storage

Use Private Aggregation to produce a summary report of the first time users saw your content without any duplication of data.
Use Shared Storage to record available user demographic data.
Use Shared Storage to build reports of unique users that have seen a piece of content at least K number of times.

Engage and share feedback

Your feedback is key to improving Private Aggregation. By sharing your insights, you contribute to the development of a privacy-respecting approach to interest-based advertising.

Reach out to us

Read the explainer, and raise questions and follow discussion about the design of the API.