AsyncAPI channel · Runway
· Runway Characters Realtime Events
/session/data
Data channel for exchanging session control messages and metadata between the client and server, including session state changes, errors, and transcript data.
Channel address
/session/data
Operations
publish
sendControlMessage
Send session control message
subscribe
receiveSessionEvent
Receive session event
Messages
SessionControlMessage
Client-initiated control message for managing session behavior.
Content-Type:
application/jsonSessionStateEvent
Server-sent event indicating a change in session state.
Content-Type:
application/jsonTranscriptEvent
Server-sent event containing transcript data from the conversation, including both user speech and avatar responses.
Content-Type:
application/jsonSessionErrorEvent
Server-sent event indicating an error occurred during the session.
Content-Type:
application/jsonAbout 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.
Browse every event-driven channel on the APIs.io network or compare with the broader Naftiko capability, Agent Skill, and MCP server surfaces of the same providers.