curl -X POST 'https://api.elevenlabs.io/v1/assets' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -F 'asset=@sample.bin' \
  -F 'name=string'

# 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?..."}

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

POST

/v1/assets

ElevenLabs API

Upload Asset

Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03 · upstream hash matched

Actions

Agents: curl -H "Accept: text/markdown" this URL
→ 184 tokens · Vary: Accept

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'

Get a free ElevenLabs API key → sponsored

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?...",
  "created_at_unix": 1721520000,
  "mime_type": "audio/mpeg",
  "name": "podcast-intro.mp3"
}