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June 16, 2026
Mark conversations as done or open

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Added

Mark a conversation as done. POST /conversations/{conversationId}/mark-as-done removes a conversation from the inbox without sending a message and returns the updated conversation.Mark a conversation as open. POST /conversations/{conversationId}/mark-as-open moves a conversation back to the inbox without sending a message and returns the updated conversation.
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June 15, 2026
Mark as read & message retry

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Added

Mark a conversation as read. POST /conversations/{conversationId}/mark-as-read clears a conversation’s unread indicator without sending a message and returns the updated conversation.Retry a failed message. POST /messages/{messageId}/retry re-attempts delivery of a message in a failed or undelivered state. Messages that have permanently failed with an error code cannot be retried.
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June 5, 2026
Users

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Added

List users. GET /users returns a paginated list of users in your Quo workspace.Get user by ID. GET /users/{userId} retrieves detailed information about a specific workspace user.
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March 30, 2026
2026-03-30 — Initial release

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API versioning

The Quo API now uses header-based versioning. Specify your target version by passing the Quo-Api-Version header on every request:
Quo-Api-Version: 2026-03-30
Version policy. A new version is only introduced when a breaking change is necessary — for example, removing a field, changing a field’s type, or altering existing behavior in an incompatible way. New endpoints, new optional fields, and bug fixes are added to the current version without a new version being published. See Versioning for the full contract.