Attio provides two APIs: a legacy V1 API (found at https://developers.attio.com) and a newer V2 API (the version you are currently viewing).
The V2 API is currently in Beta status, which means it is ready for usage by all customers while we continue to add new features and gather feedback. We don't anticipate making any breaking changes from this point.
We then expect to formally launch the V2 API to general release, removing the beta label, later this year (Summer 2023).
Although the V2 API will be the centre of development going forwards, we will continue to support and maintain the V1 API for the foreseeable future.