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Before this changelog

Changes to the API before this changelog existed are recorded from the agent skill's point of view in the skills repo CHANGELOG.

That file covers every release from the API's launch, newest first: the Robinhood Chain and Base venues, tradability advisories, the chain set, foreign listings, quote warnings and the acknowledgement token, priority mode and the speed route, the wallet-less preview, ticker details, the sponsored user-operation lane, and the /portfolio identity gate. Entries that needed action from an integration are marked Action there, the same convention this changelog uses.

From 2026-09-19 onward, every change to the public API surface gets its own entry here.