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: Speechify
providerId: speechify
created: '2026-06-21'
modified: '2026-06-21'
reconciled: false
tags:
- AI
- Text to Speech
- Voice
- Speech Synthesis
- Voice Cloning
- Rate Limiting
- Quotas
- Throttling
description: >-
  The Speechify Voice API enforces per-account limits on synthesis requests
  and is metered primarily on billable characters. Specific requests-per-minute
  and concurrency limits vary by plan (Starter, Pay-As-You-Go, Enterprise) and
  are not published as fixed numbers; the Starter tier additionally caps total
  characters and audio minutes per period. Per-account values are not
  reconciled in this artifact.
notes: >-
  Verify concurrency, requests-per-minute, and per-period character/minute
  caps against the Speechify dashboard and API documentation on reconciliation;
  limits raise with paid and Enterprise plans.
sources:
- https://docs.sws.speechify.com
- https://speechify.com/pricing-api/
responseCodes:
  throttled: 429
limits:
- name: Requests Per Minute (RPM)
  scope: account
  metric: requests
  limit: see provider documentation
  notes: Per-account synthesis request rate; varies by plan.
- name: Concurrent Streams
  scope: account
  metric: concurrent_requests
  limit: see provider documentation
  notes: Concurrent /v1/audio/stream sessions allowed; varies by plan.
- name: Characters Per Period
  scope: account
  metric: characters
  limit: 50000 on Starter; unlimited on Pay-As-You-Go
  notes: Starter free tier caps total billable characters per month.
- name: Audio Minutes Per Period
  scope: account
  metric: minutes
  limit: 100 on Starter; higher on paid plans
  notes: Starter free tier caps total synthesized audio minutes per month.
policies:
- name: Tiered Limits
  description: Limits raise as accounts move from Starter to Pay-As-You-Go and Enterprise plans.
- name: Backoff Strategy
  description: Clients should implement exponential backoff with jitter and honor Retry-After on 429 responses.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com