generated: '2026-07-22'
method: searched
source: https://twelvedata.com/docs/llms/introduction.md (Authentication section)
docs: https://twelvedata.com/docs
summary:
  types:
  - apiKey
  api_key_in:
  - query
  - header
schemes:
- name: apikey_query
  type: apiKey
  in: query
  keyName: apikey
  sources:
  - openapi/twelvedata-openapi-original.json
  notes: API key supplied as the apikey query parameter, e.g. ?apikey=YOUR_API_KEY.
    Also used to authenticate the WebSocket connection URL. Matches securityScheme
    queryParameter in the provider-published OpenAPI.
- name: apikey_header
  type: apiKey
  in: header
  keyName: Authorization
  format: 'apikey <KEY>'
  sources:
  - openapi/twelvedata-openapi-original.json
  notes: 'Recommended method — API key supplied via the Authorization header as:
    Authorization: apikey YOUR_API_KEY. Matches securityScheme authorizationHeader
    in the provider-published OpenAPI.'
key_issuance:
  signup: https://twelvedata.com/register
  dashboard: https://twelvedata.com/account/api-keys
  demo_key: apikey=demo (published demo key for demo requests)
related:
  mcp_oauth: >-
    The hosted MCP server (https://mcp.twelvedata.com/mcp) fronts the API-key
    model with OAuth 2.0 authorization-code + PKCE (RFC 8414 metadata captured
    in well-known/twelvedata-mcp-oauth-authorization-server.json, scope
    "twelvedata"); login links the user's Twelve Data API key.