Fires when the user opens the message thread. Not all devices or networks emit read receipts, so absence of this event does not imply the message was unread.

​
Payload

{
  "id": "evt_xxxxx",
  "event": "message.read",
  "timestamp": "2026-03-28T09:03:00Z",
  "data": {
    "message_id": "msg_a1b2c3d4",
    "agent_id": "ag_live_xxxx",
    "to": "+4917612345678",
    "status": "read",
    "read_at": "2026-03-28T09:03:00Z"
  }
}
​
message_id
string
Outbound message identifier.
​
agent_id
string
RCS agent that sent the message.
​
to
string
Recipient phone number in E.164 format.
​
status
string
Always read for this event.
​
read_at
string
ISO 8601 time when the read receipt was recorded.