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

> Add To Knowledge Base

## 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/knowledge-base?agent_id=' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -F 'name=string' \
  -F 'url=string'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| agent_id | query | string | No | query parameter agent_id. |
| name | body | string | No | A custom, human-readable name for the... |
| url | body | string | No | URL to a page of documentation that t... |

## Response (200 OK)
{"id":"string","name":"string","folder_path":[{"id":"string"}]}

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