AsyncAPI channel · AssemblyAI · AssemblyAI Universal Streaming Speech-to-Text API

/v3/ws

Single full-duplex WebSocket channel for a Universal Streaming session. The client publishes binary PCM audio chunks and JSON control messages, and subscribes to JSON event messages emitted by the server.

Open source AsyncAPI → All AssemblyAI channels AssemblyAI provider profile
Provider: AssemblyAI AsyncAPI: v2.6.0 Spec: AssemblyAI Universal Streaming Speech-to-Text API Operations: 2 Messages: 12

Channel address

/v3/ws

Operations

publish
sendClientMessage
Messages the client sends to the server.
receiveServerEvent
Events the server emits to the client.

Messages

AudioFrame
A raw binary chunk of PCM audio.
Content-Type: application/octet-stream
UpdateConfiguration
Update session parameters mid-stream.
Content-Type:
ForceEndpoint
Force the current turn to end immediately.
Content-Type:
Terminate
Politely terminate the streaming session.
Content-Type:
Begin
First event sent by the server after the session is established.
Content-Type:
Turn
A streaming transcription turn with word-level timings.
Content-Type:
SpeechStarted
Voice activity detected the start of speech.
Content-Type:
SpeakerRevision
Offline correction to a previously-emitted Turn's speaker labels.
Content-Type:
LLMGatewayResponse
Response from the optional in-band LLM gateway.
Content-Type:
Warning
Non-fatal server warning.
Content-Type:
Error
Server error event (see `StreamingErrorCodes` for the catalog).
Content-Type:
Termination
Final event acknowledging session shutdown.
Content-Type:

About AsyncAPI

The AsyncAPI specification describes event-driven APIs the way OpenAPI describes request/response APIs. A channel is the named pipe — a webhook URL, a Kafka topic, a WebSocket route, an MQTT subject — that producers and consumers publish or subscribe to. Each channel carries one or more messages with structured payloads, and an operation declares whether a given party sends or receives on that channel.

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