This page aggregates measured, corroborated evidence: donors' iPhones recorded apps contacting this domain, every claim below was reported by separate accepted donations and published under a human verdict (later rows for an approved app inherit its verdict). A contact is a measurement, not an accusation — it does not show what data was sent.
a-api.anthropic.com
classified as first-party · 2
What our research panel found AI-drafted · human-reviewed
We ask several independent AI models the same question and publish their answers separately — cross-vendor agreement is evidence against fabrication, and disagreement is worth seeing. 3 of 3 models answered, overall confidence high. A human reviewed this domain's claims before anything here published.
Anthropic Claude — first-party
a-api.anthropic.com is a subdomain of anthropic.com, the publisher of the app (bundle id com.anthropic.claude), so it appears to be the app's own backend API endpoint rather than a third-party service. The app's label already declares collecting user content, identifiers, and diagnostics, which is consistent with first-party API traffic, so nothing here indicates an undisclosed flow.
OpenAI — first-party
The domain is under anthropic.com and is most likely Anthropic's own API endpoint for the Claude app. The app's privacy label declares broad collection and sharing categories consistent with an app service API contact.
Google Gemini — first-party
The domain a-api.anthropic.com is owned by Anthropic, the developer of the Claude app, making it a first-party API endpoint. Contacting a first-party domain for app operations aligns with standard functionality and declared privacy practices.
Apps measured contacting this domain
| App | Label gap | Donations | Contacts | Seen |
|---|---|---|---|---|
| Claude by Anthropic | — | 3 | 3 | 2026-07-29 |
The corpus grows one report at a time: donate your App Privacy Report — anonymous by design.
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