> ## Documentation Index
> Fetch the complete documentation index at: https://docs.slng.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# API Reference

> Every SLNG endpoint, grouped by capability: the Unified API, text-to-speech, speech-to-text, voice agents, batch, and orchestrator bridges.

Every SLNG endpoint, grouped by capability. Pick a section to see request and response details, or start with the Unified API to reach any provider through one request shape.

<CardGroup cols={2}>
  <Card title="Unified API" icon="blend" href="/api-reference/unified-api/unmute-stt-bridge/unmute-stt-bridge-http">
    One request shape for every STT and TTS model. Swap providers by changing the URL. Includes parameter coverage and supported models.
  </Card>

  <Card title="Text-to-Speech" icon="audio-lines" href="/api-reference/tts/rime-arcana-v3/arcana-v3-english-http">
    Per-provider TTS endpoints over HTTP and WebSocket, plus pronunciation dictionaries.
  </Card>

  <Card title="Speech-to-Text" icon="ear" href="/api-reference/stt/deepgram-nova-3/nova-3-english-http">
    Per-provider STT endpoints for file transcription and real-time streaming.
  </Card>

  <Card title="Voice Agents" icon="bot" href="/api-reference/agents/list-agents">
    Create, configure, and dispatch SLNG voice agents, including outbound calls.
  </Card>

  <Card title="Batch" icon="https://mintcdn.com/slng/HKoD9TaAJTUAZCoE/images/providers/slng-icon.svg?fit=max&auto=format&n=HKoD9TaAJTUAZCoE&q=85&s=39ec73086f8c747b352b393a0200132c" href="/api-reference/batch" width="59" height="65" data-path="images/providers/slng-icon.svg">
    Submit and manage large transcription and synthesis jobs asynchronously.
  </Card>

  <Card title="Bridges" icon="cable" href="/api-reference/bridges/cognigy-stt-bridge/cognigy-stt-bridge-http">
    Connect Cognigy and Jambonz voice platforms to SLNG STT and TTS.
  </Card>
</CardGroup>