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: Hume AI
providerId: hume-ai
created: '2026-05-08'
# Provenance stamped 2026-08-11: this artifact was written by the API Evangelist
# bulk sweep dated 2026-05-08, not harvested from the provider. See roadmap#35.
method: generated
modified: '2026-05-08'
reconciled: partial
tags:
- AI
- Voice
- Empathic
- Emotion
- Multimodal
- Rate Limiting
- Quotas
- Throttling
description: >-
  Hume rate-limits primarily through plan-based monthly TTS character allowances, EVI minutes,
  and concurrent connection caps. Specific HTTP RPS limits are not publicly documented;
  Expression Measurement is gated by job throughput.
notes: Plan-tier monthly quotas are the documented scaling lever. Concurrent connections start at 1 on Free.
sources:
- https://www.hume.ai/pricing
- https://dev.hume.ai/
responseCodes:
  throttled: 429
limits:
- name: TTS Characters/Month (Free)
  scope: account
  metric: characters
  limit: 10000
  notes: ~10 minutes of TTS audio.
- name: EVI Minutes/Month (Free)
  scope: account
  metric: minutes
  limit: 5
- name: Concurrent Connections (Free)
  scope: account
  metric: concurrent_connections
  limit: 1
- name: EVI Minutes/Month (Business)
  scope: account
  metric: minutes
  limit: 12500
- name: HTTP Requests
  scope: account
  metric: requests
  limit: not publicly documented
  notes: Verify with Hume support; standard 429 backoff applies.
policies:
- name: Backoff Strategy
  description: Clients should implement exponential backoff with jitter and honor any Retry-After header.
- name: Plan Sizing
  description: Choose plan tier based on monthly TTS character and EVI minute usage projections.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com