---
title: "Start real-time speech-to-text on a leg"
method: POST
path: "/legs/{id}/stt"
tags: ["Legs"]
---

# Start real-time speech-to-text on a leg

`POST /legs/{id}/stt`

## Request body

- STTRequest
  - `language` string, required — Language code (e.g. "en", "es")
  - `partial` boolean, required — Emit partial (non-final) transcripts
  - `provider` 'elevenlabs' | 'deepgram' — STT provider: "elevenlabs" (default) or "deepgram"
  - `api_key` string — API key override (falls back to ELEVENLABS_API_KEY or DEEPGRAM_API_KEY env var depending on provider)

## Response `200`

STT started

- StatusResponse
  - `instance_id` string — Instance identifier
  - `status` string, required

## Other responses

- `404` — Leg not found
- `409` — Leg not connected, STT already running, or no audio reader
- `503` — No ElevenLabs API key provided

---

[API](https://skmtc.net/voiceblender/apis/voiceblender-api.md) · [All operations](https://skmtc.net/voiceblender/apis/voiceblender-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/voiceblender/voiceblender-api/versions/ad30827d3b57/schema)