generated: '2026-07-19'
method: searched
source: https://docs.gradium.ai/guides/installation, https://docs.gradium.ai/guides/browser-websockets, https://docs.gradium.ai/guides/errors
docs: https://docs.gradium.ai/api-reference/introduction
note: >-
  The published OpenAPI (openapi/gradium-openapi-original.json) declares no
  components.securitySchemes; the authentication model below is captured from
  the Gradium docs, not derived from the spec.
summary:
  types: [apiKey, bearer-token]
  api_key_in: [header]
  api_key_header: x-api-key
  api_key_prefix: gd_
  oauth2_flows: []
schemes:
- name: ApiKeyAuth
  type: apiKey
  in: header
  parameter: x-api-key
  key_prefix: gd_
  env_var: GRADIUM_API_KEY
  applies_to: All REST endpoints and server-to-server calls.
  source: https://docs.gradium.ai/guides/installation
- name: ShortLivedToken
  type: token-exchange
  description: >-
    For browser/mobile WebSocket clients, exchange the server-side API key for a
    single-use, short-lived token via GET https://api.gradium.ai/api/api-keys/token
    (x-api-key header). The client connects to the WebSocket endpoint with
    ?token=<token>. Token is consumed on verification; issue one per connection.
  token_endpoint: https://api.gradium.ai/api/api-keys/token
  transport: query-parameter (?token=)
  applies_to: WebSocket endpoints (/api/speech/tts, /api/speech/asr, /api/speech/s2s)
  source: https://docs.gradium.ai/guides/browser-websockets
errors:
  invalid_or_revoked_key:
    code: 1008
    rest: "HTTP 500 plain-text body 'error from server 1008: API key is revoked or expired'"
    websocket: 'error message {"type":"error","message":"...","code":1008} then socket close'