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: WellSaid Labs
providerId: wellsaid
created: '2026-06-21'
modified: '2026-06-21'
reconciled: false
tags:
- AI
- Text to Speech
- Voice
- Audio
- TTS
- Rate Limiting
- Quotas
- Throttling
description: >-
  The WellSaid Labs API enforces per-account rate limiting on text-to-speech
  render endpoints, returning HTTP 429 when limits are exceeded. Each render
  request is bounded to 1,000 characters of input text. Specific per-account
  requests-per-minute / concurrency limits and any per-tier render quotas are
  not publicly documented and vary by plan and Enterprise agreement; they are
  not reconciled in this artifact.
notes: >-
  Confirm concurrency, requests-per-minute, and any daily render/character
  quotas with WellSaid Labs during reconciliation. The 1,000-character
  per-request input cap is documented in the API reference; subscription
  clip-length caps (commonly cited at 5,000 characters) apply in Studio rather
  than as an API per-request limit.
sources:
- https://docs.wellsaidlabs.com/reference/getting-started-with-your-api
- https://docs.wellsaidlabs.com/reference/ttsstream
responseCodes:
  throttled: 429
limits:
- name: Requests Per Minute
  scope: account
  metric: requests
  limit: see provider documentation
  notes: Per-account request rate limiting; exact value not publicly documented.
- name: Concurrent Renders
  scope: account
  metric: concurrent_requests
  limit: see provider documentation
  notes: Concurrency limit on simultaneous TTS renders; varies by plan.
- name: Input Characters Per Request
  scope: request
  metric: characters
  limit: 1000
  notes: Each render request accepts 1-1000 characters of input text.
policies:
- name: Tiered Limits
  description: Limits and render quotas vary by subscription tier and Enterprise agreement.
- name: Backoff Strategy
  description: Clients should implement exponential backoff with jitter on HTTP 429 responses.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com