# PATCH /v1/dubbing/project/{project_id}/transcript/segments (ElevenLabs API)
Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03

> Update Dubbing Transcript Segments

## 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 PATCH 'https://api.elevenlabs.io/v1/dubbing/project/project-id/transcript/segments' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"segments":{}}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| project_id | path | string | Yes | Identifier of the dubbing project. |
| segments | body | object | Yes | Map of segment ID to the partial update to apply to that... |

## Response (200 OK)
{"segments":[{}],"revision":0}

---
Need an API key? Get one at https://elevenlabs.io/app/sign-up