specification: API Commons Rate Limits
specificationVersion: '0.1'
schema: https://raw.githubusercontent.com/api-evangelist/interface-research/main/schema/api-commons.yml#/$defs/RateLimits
provider: Camb.AI
providerId: camb-ai
created: '2026-07-11'
modified: '2026-07-11'
reconciled: false
tags:
- AI
- Text to Speech
- Dubbing
- Translation
- Rate Limiting
- Quotas
description: >-
  Camb.AI does not publish fixed numeric per-minute request limits for the API.
  Consumption is governed primarily by the monthly credit allowance of the
  subscription plan - credits are spent across TTS, dubbing, translation, and
  transcription - together with per-plan ceilings such as characters per
  generation, custom voice count, video file size, concurrent teams, and live
  streaming minutes and concurrent streams. Because most operations are
  asynchronous (create a task, then poll), the documentation recommends polling
  status endpoints at reasonable intervals (roughly every 5 to 15 seconds) rather
  than tight loops.
notes: >-
  Numeric per-endpoint request-rate limits are not documented as of the review
  date. Verify plan allowances at https://www.camb.ai/pricing and the polling
  guidance at https://docs.camb.ai. Streaming TTS responses include an
  X-Credits-Required header indicating the credit cost of the request.
sources:
- https://docs.camb.ai
- https://www.camb.ai/pricing
responseCodes:
  throttled: 429
limits:
- name: Monthly Credit Allowance
  scope: account
  metric: credits
  limit: per plan (2000 Free to 1.8M Expert)
  notes: Shared credit budget consumed across all products; the primary consumption control.
- name: Characters per Generation
  scope: request
  metric: characters
  limit: per plan (for example 3000 on Essentials/Pro; unlimited on higher tiers)
  notes: Streaming TTS accepts 3 to 3000 characters per request on lower tiers.
- name: Custom Voices
  scope: account
  metric: voices
  limit: per plan (1 Free to 150+ Expert)
  notes: Ceiling on the number of stored custom (cloned or designed) voices.
- name: Video File Size
  scope: request
  metric: bytes
  limit: per plan (for example up to 1 GB on Premier and above)
  notes: Applies to dubbing and other media uploads.
- name: Live Streaming
  scope: account
  metric: minutes
  limit: per plan (for example 15 minutes, 1 concurrent stream on Expert)
  notes: Realtime streaming minutes and concurrent stream count are plan-gated.
- name: API Request Rate
  scope: account
  metric: requests
  limit: not published
  notes: No fixed numeric per-minute request-rate limit is documented.
policies:
- name: Polling Interval
  description: Poll asynchronous task status endpoints at reasonable intervals (about 5 to 15 seconds) until status is SUCCESS, rather than in a tight loop.
- name: Backoff Strategy
  description: Clients should implement exponential backoff with jitter and honor Retry-After on 429 responses.
- name: Credit Metering
  description: Requests consume plan credits; streaming TTS surfaces the cost via the X-Credits-Required response header.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com