# POST /v1/speech-to-text (ElevenLabs API)
Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03

> Speech To Text

## Critical Gotchas
* Authentication uses the non-standard `xi-api-key` header, not `Authorization: Bearer`. Sending a Bearer token returns HTTP 401.
* Text-to-speech responses are raw binary audio, not JSON. Write the body to a file (`--output speech.mp3`) rather than parsing it.

## cURL
curl -X POST 'https://api.elevenlabs.io/v1/speech-to-text?token=example-token&enable_logging=true' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -F 'model_id=string'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| model_id | body | string | Yes | The ID of the model to use for transc... |
| token | query | string | No | A single-use authentication token cre... |
| enable_logging | query | boolean | No | When enable_logging is set to false z... |

## Response (200 OK)
{"language_code":"en","language_probability":0.98}

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