generated: '2026-09-14'
method: searched
source: https://docs.aiola.ai/developer-guides/text-to-speech/quickstart, https://docs.aiola.ai/developer-guides/speech-to-text/quickstart
limit_count: 0
rate_limits: []
headers: []
status_on_exhaustion: undocumented
note: >-
  aiOla publishes no numeric rate limit. The full extent of the documented guidance is
  one bullet on the text-to-speech quickstart — "Rate Limiting: Be mindful of API rate
  limits for production applications" — with no scope, window, ceiling, burst allowance,
  response header, or exhaustion status code. The limits clearly exist: aiOla's own SDK
  ships RATE_LIMIT_EXCEEDED and MAX_CONCURRENCY_REACHED as error codes it expects the
  service to return. An honest zero is recorded rather than a guess.
observed_constraints:
- constraint: maximum audio file size
  value: 50 MB
  scope: per request, POST /api/speech-to-text/file
  source: https://docs.aiola.ai/developer-guides/speech-to-text/quickstart
  note: >-
    A payload cap, not a rate limit — recorded here because it is the only published
    numeric ceiling on the API and it is what a batch client will hit first. Larger audio
    must be streamed or split.
- constraint: concurrent sessions per account
  value: undocumented
  scope: per account
  signal: error code MAX_CONCURRENCY_REACHED
  release: DELETE https://auth.aiola.ai/voip-auth/session
  note: >-
    The binding limit on this API is almost certainly concurrency rather than
    requests-per-second, since a streaming session holds a slot for its whole lifetime.
    The ceiling is not published, so a caller cannot size a workload before running it.
- constraint: access token lifetime
  value: ~30 minutes
  scope: per session
  source: https://docs.aiola.ai/developer-guides/authentication
gaps:
- No RateLimit-* / X-RateLimit-* response headers are documented.
- No Retry-After behaviour is documented.
- No status code is documented for an exhausted limit.
- The concurrency ceiling — the limit the error taxonomy implies matters most — has no
  published value.