curl -X POST 'https://api.elevenlabs.io/v1/convai/environment-variables' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "type": "string",
  "label": "string",
  "values": {}
}'

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

> Create Environment Variable

## 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/convai/environment-variables' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"type":"string","label":"string","values":{}}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| type | body | string | Yes | Request body field type. |
| label | body | string | Yes | Unique label for the environment variable. |
| values | body | object | Yes | Environment-specific values. Must include 'production' key. |

## Response (200 OK)
{"label":"string","created_at_unix_secs":0}

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

POST

/v1/convai/environment-variables

ElevenLabs API

Create Environment Variable

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
→ 208 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/convai/environment-variables' \  -H "xi-api-key: $ELEVENLABS_API_KEY" \  -H 'Content-Type: application/json' \  -d '{  "type": "string",  "label": "string",  "values": {}}'

Get a free ElevenLabs API key → sponsored

Parameters

Name	In	Type	Required	Description
type	body	string	Yes	Request body field type.
label	body	string	Yes	Unique label for the environment variable.
values	body	object	Yes	Environment-specific values. Must include 'production' key.

Response 200 OK

{
  "label": "string",
  "created_at_unix_secs": 0,
  "updated_at_unix_secs": 0,
  "created_by_user_id": "string",
  "type": "string",
  "id": "string",
  "workspace_id": "string",
  "values": {}
}