---
title: "Subscribe to live call events (SSE)"
method: GET
path: "/events"
tags: ["Live Transcripts"]
---

# Subscribe to live call events (SSE)

`GET /events`

Real-time streaming of user speech (STT) and agent speech (TTS) events for an active call via Server-Sent Events.

The connection is real-time — events stream directly from the call runtime as they are produced. The SSE connection auto-closes when the call ends (`sse_close` event). Only active calls can be subscribed to; completed calls return a 400 error.

**Transcript event types:**

- `user_interim_transcription` — Partial, in-progress transcription as the user speaks. Use for live preview only; will be superseded by `user_transcription`.
- `user_transcription` — Final transcription for a completed user speech turn.
- `tts_completed` — Fired when the agent finishes speaking a TTS segment. Includes the spoken text and optionally TTS latency.

**Lifecycle events:**

- `sse_init` — Sent immediately when the SSE connection is established.
- `sse_close` — Sent when the call ends, right before the server closes the connection.

Other event types (e.g. `tool_call_start`, `pre_call_api`, `agent_log`, metrics) are also sent on this stream.

- `call_start`
- `call_end`
- `turn_latency`
- `metrics`
- `agent_node_state`
- `hopping`
- `knowledgebase`
- `variable_extraction`
- `pre_call_api`
- `post_call_api`
- `agent_error`
- `agent_log`
- `tool_call_start`
- `tool_call_end`
- `tool_call_error`
- `call_cancelled`
- `call_recording`

## Query parameters

- `callId` string, required

## Headers

- `X-Organization-Id` string

## Response `200`

SSE event stream established successfully

## Other responses

- `400` — Missing or invalid `callId`, missing or invalid organization header, or call is already completed.
- `401` — Missing or invalid bearer token or session.
- `403` — User is not a member of the organization or does not have member access.
- `404` — Organization not found, call log not found, or agent not found/org mismatch.
- `500` — Internal server error.

---

[API](https://skmtc.net/smallest-inc/apis/agent-management-api.md) · [All operations](https://skmtc.net/smallest-inc/apis/agent-management-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/smallest-inc/agent-management-api/versions/c2d0eb64b01a/schema)