AsyncAPI channel · SLNG · SLNG Gateway API - SLNG STT

`/v1/stt/slng/deepgram/nova:3-en`

Stream real-time English transcripts from SLNG-hosted Deepgram Nova 3 over WebSocket with low-latency partials, finals, and speaker diarization.

Open source AsyncAPI → All SLNG channels SLNG provider profile

Provider: SLNG AsyncAPI: v3.0.0 Spec: SLNG Gateway API - SLNG STT Messages: 8

Channel address

/v1/stt/slng/deepgram/nova:3-en

Messages

SlngDeepgramNova3EnSttInitRequest

Initialize an SLNG-hosted Deepgram Nova 3 English STT session.

Content-Type: application/json

DeepgramSttBinaryAudio

Stream raw binary PCM audio frames to be transcribed. Sent as binary WebSocket frames (NOT JSON). Recommended chunk size is 8192 bytes (~256ms at 16kHz linear16). Start streaming immediately after the

Content-Type: application/octet-stream

SttFinalizeMessage

Force-finalize buffered audio tokens without closing the connection.

Content-Type: application/json

SttCloseMessage

Signal end of audio stream and close the connection.

Content-Type: application/json

KeepaliveMessage

Keep the WebSocket connection alive during silence.

Content-Type: application/json

DeepgramSttMetadata

Deepgram session metadata. Sent when the backend connects and again after the session ends with final statistics. This is informational — do not wait for it before streaming audio.

Content-Type: application/json

DeepgramSttResultsEn

Deepgram transcription result — partial or final, determined by is_final.

Content-Type: application/json

DeepgramSttError

Error from the Deepgram backend or gateway.

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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