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

> Upload Asset

## 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/assets' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -F 'asset=@sample.bin' \
  -F 'name=string'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| asset | body | string | Yes | The file to upload. |
| name | body | string | Yes | Display name for the asset. |

## Response (200 OK)
{"asset_id":"5xM2KqOnZyce22SPZ9d4","content_url":"https://.../a1b2c3d4/content?..."}

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