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The Quoin Property API has one live version: v4. Everything on this site describes it.
Older versions (v1, v2, v3) are retired. Any /api/v1, /api/v2 or /api/v3 request returns 410 version_retired. Ignore examples elsewhere on the web that use them.

Always-current URLs

These URLs never change and always describe the current version, so tools and agents that use them move to a new version automatically: Request paths include the version (/api/v4/...) so a running integration never changes behaviour under you.

Retired versions

A call to a retired version returns:
Read current_version and move to it. Retired calls are never charged.

New versions

A new version replaces the old one in a single release: these docs, the OpenAPI spec and the agent instructions switch to it at the same time, and the release is listed in the Changelog. Within a version, changes are additive only: new endpoints, optional parameters and response fields.