AsyncAPI channel · PlayHT · PlayAI Realtime WebSocket APIs

/v1/talk/{agentId}

Voice Agents audio-in / audio-out WebSocket. The connection is established with the target agent identifier; the first client message must be a `setup` frame carrying the API key and the desired audio configuration. Server sends `audioStream` chunks, voice activity events, `newAudioStream` markers, and `error` messages.

Open source AsyncAPI → All PlayHT channels PlayHT provider profile
Provider: PlayHT AsyncAPI: v2.6.0 Spec: PlayAI Realtime WebSocket APIs Operations: 2 Messages: 7

Channel address

/v1/talk/{agentId}

Parameters

Operations

publish
sendAgentClientMessage
Send a client message to the voice agent.
receiveAgentServerMessage
Receive messages from the voice agent.

Messages

AgentSetup
First client message on a Voice Agents connection. Carries the API key and the desired audio in/out configuration.
Content-Type: application/json
AgentAudioIn
Streams base64-encoded user audio into the agent.
Content-Type: application/json
AgentAudioStream
Base64-encoded chunk of the agent's spoken response.
Content-Type: application/json
AgentNewAudioStream
Indicates the start of a new agent response stream. Clients should clear their playback buffer and start playing the new stream.
Content-Type: application/json
AgentVoiceActivityStart
Server detected the user started speaking.
Content-Type: application/json
AgentVoiceActivityEnd
Server detected the user stopped speaking.
Content-Type: application/json
AgentError
Error message emitted by the Voice Agents server.
Content-Type: application/json

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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