generated: '2026-07-19'
method: derived
source: openapi/gradium-openapi-original.json, https://docs.gradium.ai/guides/errors, https://docs.gradium.ai/guides/browser-websockets
standards:
- id: openapi-3.1
  conforms: true
  evidence: openapi field "3.1.0" in the published spec
- id: apikey-auth
  conforms: true
  evidence: x-api-key header documented; all REST calls authenticated by API key
- id: oauth2
  conforms: false
  evidence: no oauth2 securityScheme; API-key + short-lived token model only
- id: rfc9457-problem-details
  conforms: false
  evidence: errors use plain-text (REST pre-stream) and custom JSON envelopes, not application/problem+json
- id: rfc6455-websocket
  conforms: true
  evidence: real-time TTS/STT/S2S over WebSocket (/api/speech/*), with setup/ready/flush/end_of_stream lifecycle and 1008/1011 close codes
- id: pagination
  conforms: true
  evidence: voices skip/limit and pronunciations offset/limit query parameters
- id: rfc8594-sunset
  conforms: false
  evidence: model phase-out documented as policy prose; no Sunset/Deprecation HTTP headers documented
- id: idempotency
  conforms: false
  evidence: no Idempotency-Key contract documented