Hume AI

Hume AI builds empathic voice and emotional AI models. The platform exposes four published APIs: Voices, Octave Text-to-Speech, Empathic Voice Interface (EVI / speech-to-speech), and Expression Measurement (multimodal emotion analysis). REST + WebSocket interfaces are documented with public OpenAPI and AsyncAPI specifications at https://dev.hume.ai/.

Hume AI publishes 10 API contracts indexed on the APIs.io network, including Subpackage Batch API, Subpackage Chat Groups API, Subpackage Chats API, and 7 more. Tagged areas include Artificial Intelligence, Voice, Empathic, Emotion, and Multi-Modal.

The Hume AI catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Hume AI’s developer surface includes authentication, documentation, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

30.9/100 thin ▬ flat Agent 30/100 agent ready Front door AI 5/6 prominent Heartbeat 91/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

4 published contracts

Artificial Intelligence VoiceEmpathicEmotionMulti-Modal Conversational AI Real-Time

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 30.9/100 · thin

Contract Quality 10.8 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 2.8 / 15

Operational Transparency 1.0 / 10

Contract Governance 1.0 / 9

Discoverability 5.4 / 8

Regulatory Posture 1.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the AI & Biometrics regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 18.4 — up to +16.3 composite points
Developer Ergonomics scores 23.8 — up to +15.2 composite points
Operational Transparency scores 10.5 — up to +11.6 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/hume-ai/apis.yml: open an issue on github.com/api-evangelist/hume-ai to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Speech and Voice AI	covered	37.0	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 10

Individual APIs this provider publishes, each with its own machine-readable definition.

Hume AI Subpackage Batch API

The subpackage_batch API from Hume AI — 4 operation(s) for subpackage_batch.

Hume AI Subpackage Chat Groups API

The subpackage_chatGroups API from Hume AI — 4 operation(s) for subpackage_chatgroups.

Hume AI Subpackage Chats API

The subpackage_chats API from Hume AI — 3 operation(s) for subpackage_chats.

Hume AI Subpackage Configs API

The subpackage_configs API from Hume AI — 3 operation(s) for subpackage_configs.

Hume AI Subpackage Control Plane API

The subpackage_controlPlane API from Hume AI — 1 operation(s) for subpackage_controlplane.

Hume AI Subpackage Prompts API

The subpackage_prompts API from Hume AI — 3 operation(s) for subpackage_prompts.

Hume AI Subpackage Tools API

The subpackage_tools API from Hume AI — 3 operation(s) for subpackage_tools.

Hume AI Subpackage Voices API

The subpackage_voices API from Hume AI — 1 operation(s) for subpackage_voices.

Hume AI Speech To Speech (EVI) API

The Speech To Speech (EVI) API from Hume AI — 0 operation(s) for speech to speech (evi).

Hume AI Tts API

The Tts API from Hume AI — 6 operation(s) for tts.

Scroll for all 10

Open Collections 13

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Speech-to-speech (EVI) API

OPEN COLLECTION

Speech-to-speech (EVI)

OPEN COLLECTION

Expression Measurement API

OPEN COLLECTION

Speech-to-speech (EVI) subpackage_batch API

OPEN COLLECTION

Speech-to-speech (EVI) subpackage_chatGroups API

OPEN COLLECTION

Speech-to-speech (EVI) subpackage_chats API

OPEN COLLECTION

Speech-to-speech (EVI) subpackage_configs API

OPEN COLLECTION

Speech-to-speech (EVI) subpackage_controlPlane API

OPEN COLLECTION

Speech-to-speech (EVI) subpackage_prompts API

OPEN COLLECTION

Speech-to-speech (EVI) subpackage_tools API

OPEN COLLECTION

Speech-to-speech (EVI) subpackage_voices API

OPEN COLLECTION

Text-to-Speech (TTS)

OPEN COLLECTION

Voices

OPEN COLLECTION

Scroll for all 13

Hume AI API pricing

Not yet checked against Hume AI's own pricing page. Compiled by API Evangelist on 2026-05-08 from www.hume.ai/pricing; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free free	—
Starter subscription	—
Creator subscription	—
Pro subscription	—
Scale subscription	—
Business subscription	—
Enterprise enterprise	—
Expression Measurement (Pay-as-you-go) usage	—

Plan details, limits and sources →

Rate limits

TTS Characters/Month (Free): 10000 characters
EVI Minutes/Month (Free): 5 minutes
Concurrent Connections (Free): 1 concurrent connections

Compiled by API Evangelist, not yet checked against Hume AI's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Hume Ai Plans Pricing

8 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Hume Ai Rate Limits

5 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Hume AI

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Hume Ai Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Hume AI WebSocket APIs

Consolidated AsyncAPI definition for Hume AI's two production WebSocket surfaces: - **Empathic Voice Interface (EVI)** — bidirectional speech-to-speech voice conversation at `ws...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Hume AI — asyncapi rules

8 rules · 1 errors 7 warnings

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Hume Ai Authentication

apiKey · 1 scheme

SECURITY

Hume Ai Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Hume Ai Agentic Access

49 operations · 28 acting · 1 human-in-the-loop

49 operations · 28 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: hume-ai
url: https://raw.githubusercontent.com/api-evangelist/hume-ai/refs/heads/main/apis.yml
name: Hume AI
kind: company
description: 'Hume AI builds empathic voice and emotional AI models. The platform exposes four published APIs: Voices, Octave
  Text-to-Speech, Empathic Voice Interface (EVI / speech-to-speech), and Expression Measurement (multimodal emotion analysis).
  REST + WebSocket interfaces are documented with public OpenAPI and AsyncAPI specifications at https://dev.hume.ai/.'
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/hume-ai.png
x-docs-platform: fern
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
tags:
- Artificial Intelligence
- Voice
- Empathic
- Emotion
- Multi-Modal
- Conversational AI
- Real-Time
tags_raw:
- AI
- Voice
- Empathic
- Emotion
- Multimodal
- Conversational AI
- Real-Time
created: '2026-05-08'
modified: '2026-05-29'
specificationVersion: '0.23'
apis:
- aid: hume-ai:hume-ai-subpackage-batch-api
  name: Hume AI Subpackage Batch API
  description: The subpackage_batch API from Hume AI — 4 operation(s) for subpackage_batch.
  humanURL: https://dev.hume.ai/reference
  baseURL: https://api.hume.ai
  tags: []
  tags_raw:
  - subpackage_batch
  properties:
  - type: OpenAPI
    url: openapi/hume-ai-subpackage-batch-api-openapi.yml
  - type: Documentation
    url: https://dev.hume.ai/reference
  - type: Documentation
    url: https://dev.hume.ai/docs/text-to-speech-tts
  - type: Pricing
    url: https://www.hume.ai/pricing
  - type: Documentation
    url: https://dev.hume.ai/docs/speech-to-speech-evi
  - type: AsyncAPI
    url: https://dev.hume.ai/asyncapi.yaml
  - type: AsyncAPI
    url: asyncapi/hume-ai-asyncapi.yml
  - type: Documentation
    url: https://dev.hume.ai/docs/expression-measurement
- aid: hume-ai:hume-ai-subpackage-chatgroups-api
  name: Hume AI Subpackage Chat Groups API
  description: The subpackage_chatGroups API from Hume AI — 4 operation(s) for subpackage_chatgroups.
  humanURL: https://dev.hume.ai/reference
  baseURL: https://api.hume.ai
  tags:
  - subpackage_chatGroups
  properties:
  - type: OpenAPI
    url: openapi/hume-ai-subpackage-chatgroups-api-openapi.yml
  - type: Documentation
    url: https://dev.hume.ai/reference
  - type: Documentation
    url: https://dev.hume.ai/docs/text-to-speech-tts
  - type: Pricing
    url: https://www.hume.ai/pricing
  - type: Documentation
    url: https://dev.hume.ai/docs/speech-to-speech-evi
  - type: AsyncAPI
    url: https://dev.hume.ai/asyncapi.yaml
  - type: AsyncAPI
    url: asyncapi/hume-ai-asyncapi.yml
  - type: Documentation
    url: https://dev.hume.ai/docs/expression-measurement
- aid: hume-ai:hume-ai-subpackage-chats-api
  name: Hume AI Subpackage Chats API
  description: The subpackage_chats API from Hume AI — 3 operation(s) for subpackage_chats.
  humanURL: https://dev.hume.ai/reference
  baseURL: https://api.hume.ai
  tags: []
  tags_raw:
  - subpackage_chats
  properties:
  - type: OpenAPI
    url: openapi/hume-ai-subpackage-chats-api-openapi.yml
  - type: Documentation
    url: https://dev.hume.ai/reference
  - type: Documentation
    url: https://dev.hume.ai/docs/text-to-speech-tts
  - type: Pricing
    url: https://www.hume.ai/pricing
  - type: Documentation
    url: https://dev.hume.ai/docs/speech-to-speech-evi
  - type: AsyncAPI
    url: https://dev.hume.ai/asyncapi.yaml
  - type: AsyncAPI
    url: asyncapi/hume-ai-asyncapi.yml
  - type: Documentation
    url: https://dev.hume.ai/docs/expression-measurement
- aid: hume-ai:hume-ai-subpackage-configs-api
  name: Hume AI Subpackage Configs API
  description: The subpackage_configs API from Hume AI — 3 operation(s) for subpackage_configs.
  humanURL: https://dev.hume.ai/reference
  baseURL: https://api.hume.ai
  tags: []
  tags_raw:
  - subpackage_configs
  properties:
  - type: OpenAPI
    url: openapi/hume-ai-subpackage-configs-api-openapi.yml
  - type: Documentation
    url: https://dev.hume.ai/reference
  - type: Documentation
    url: https://dev.hume.ai/docs/text-to-speech-tts
  - type: Pricing
    url: https://www.hume.ai/pricing
  - type: Documentation
    url: https://dev.hume.ai/docs/speech-to-speech-evi
  - type: AsyncAPI
    url: https://dev.hume.ai/asyncapi.yaml
  - type: AsyncAPI
    url: asyncapi/hume-ai-asyncapi.yml
  - type: Documentation
    url: https://dev.hume.ai/docs/expression-measurement
- aid: hume-ai:hume-ai-subpackage-controlplane-api
  name: Hume AI Subpackage Control Plane API
  description: The subpackage_controlPlane API from Hume AI — 1 operation(s) for subpackage_controlplane.
  humanURL: https://dev.hume.ai/reference
  baseURL: https://api.hume.ai
  tags:
  - subpackage_controlPlane
  properties:
  - type: OpenAPI
    url: openapi/hume-ai-subpackage-controlplane-api-openapi.yml
  - type: Documentation
    url: https://dev.hume.ai/reference
  - type: Documentation
    url: https://dev.hume.ai/docs/text-to-speech-tts
  - type: Pricing
    url: https://www.hume.ai/pricing
  - type: Documentation
    url: https://dev.hume.ai/docs/speech-to-speech-evi
  - type: AsyncAPI
    url: https://dev.hume.ai/asyncapi.yaml
  - type: AsyncAPI
    url: asyncapi/hume-ai-asyncapi.yml
  - type: Documentation
    url: https://dev.hume.ai/docs/expression-measurement
- aid: hume-ai:hume-ai-subpackage-prompts-api
  name: Hume AI Subpackage Prompts API
  description: The subpackage_prompts API from Hume AI — 3 operation(s) for subpackage_prompts.
  humanURL: https://dev.hume.ai/reference
  baseURL: https://api.hume.ai
  tags: []
  tags_raw:
  - subpackage_prompts
  properties:
  - type: OpenAPI
    url: openapi/hume-ai-subpackage-prompts-api-openapi.yml
  - type: Documentation
    url: https://dev.hume.ai/reference
  - type: Documentation
    url: https://dev.hume.ai/docs/text-to-speech-tts
  - type: Pricing
    url: https://www.hume.ai/pricing
  - type: Documentation
    url: https://dev.hume.ai/docs/speech-to-speech-evi
  - type: AsyncAPI
    url: https://dev.hume.ai/asyncapi.yaml
  - type: AsyncAPI
    url: asyncapi/hume-ai-asyncapi.yml
  - type: Documentation
    url: https://dev.hume.ai/docs/expression-measurement
- aid: hume-ai:hume-ai-subpackage-tools-api
  name: Hume AI Subpackage Tools API
  description: The subpackage_tools API from Hume AI — 3 operation(s) for subpackage_tools.
  humanURL: https://dev.hume.ai/reference
  baseURL: https://api.hume.ai
  tags: []
  tags_raw:
  - subpackage_tools
  properties:
  - type: OpenAPI
    url: openapi/hume-ai-subpackage-tools-api-openapi.yml
  - type: Documentation
    url: https://dev.hume.ai/reference
  - type: Documentation
    url: https://dev.hume.ai/docs/text-to-speech-tts
  - type: Pricing
    url: https://www.hume.ai/pricing
  - type: Documentation
    url: https://dev.hume.ai/docs/speech-to-speech-evi
  - type: AsyncAPI
    url: https://dev.hume.ai/asyncapi.yaml
  - type: AsyncAPI
    url: asyncapi/hume-ai-asyncapi.yml
  - type: Documentation
    url: https://dev.hume.ai/docs/expression-measurement
- aid: hume-ai:hume-ai-subpackage-voices-api
  name: Hume AI Subpackage Voices API
  description: The subpackage_voices API from Hume AI — 1 operation(s) for subpackage_voices.
  humanURL: https://dev.hume.ai/reference
  baseURL: https://api.hume.ai
  tags: []
  tags_raw:
  - subpackage_voices
  properties:
  - type: OpenAPI
    url: openapi/hume-ai-subpackage-voices-api-openapi.yml
  - type: Documentation
    url: https://dev.hume.ai/reference
  - type: Documentation
    url: https://dev.hume.ai/docs/text-to-speech-tts
  - type: Pricing
    url: https://www.hume.ai/pricing
  - type: Documentation
    url: https://dev.hume.ai/docs/speech-to-speech-evi
  - type: AsyncAPI
    url: https://dev.hume.ai/asyncapi.yaml
  - type: AsyncAPI
    url: asyncapi/hume-ai-asyncapi.yml
  - type: Documentation
    url: https://dev.hume.ai/docs/expression-measurement
- aid: hume-ai:hume-ai-speech-to-speech-evi-api
  name: Hume AI Speech To Speech (EVI) API
  description: The Speech To Speech (EVI) API from Hume AI — 0 operation(s) for speech to speech (evi).
  humanURL: https://dev.hume.ai/reference
  baseURL: https://api.hume.ai
  tags:
  - Speech To Speech (EVI)
  properties:
  - type: OpenAPI
    url: openapi/hume-ai-speech-to-speech-evi-api-openapi.yml
- aid: hume-ai:hume-ai-tts-api
  name: Hume AI Tts API
  description: The Tts API from Hume AI — 6 operation(s) for tts.
  humanURL: https://dev.hume.ai/reference
  baseURL: https://api.hume.ai
  tags:
  - Text-to-Speech
  tags_raw:
  - Tts
  - TTS
  properties:
  - type: OpenAPI
    url: openapi/hume-ai-tts-api-openapi.yml
  - type: Documentation
    url: https://dev.hume.ai/reference
  - type: Documentation
    url: https://dev.hume.ai/docs/text-to-speech-tts
  - type: Pricing
    url: https://www.hume.ai/pricing
  - type: Documentation
    url: https://dev.hume.ai/docs/speech-to-speech-evi
  - type: AsyncAPI
    url: https://dev.hume.ai/asyncapi.yaml
  - type: AsyncAPI
    url: asyncapi/hume-ai-asyncapi.yml
  - type: Documentation
    url: https://dev.hume.ai/docs/expression-measurement
common:
- type: AgenticAccess
  url: agentic-access/hume-ai-agentic-access.yml
- type: DomainSecurity
  url: security/hume-ai-domain-security.yml
- type: Authentication
  url: authentication/hume-ai-authentication.yml
- type: GitHubOrganization
  url: https://github.com/HumeAI
- type: LinkedIn
  url: https://www.linkedin.com/company/hume-ai
- type: Website
  url: https://www.hume.ai/
- type: Documentation
  url: https://dev.hume.ai/
- type: Plans
  url: plans/hume-ai-plans-pricing.yml
- type: RateLimits
  url: rate-limits/hume-ai-rate-limits.yml
- type: FinOps
  url: finops/hume-ai-finops.yml
- url: https://www.hume.ai/blog
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Hume AI API — frequently asked questions

Does Hume AI have an API?

Yes. APIs.io lists 10 APIs from Hume AI, including Hume AI Subpackage Batch API, Hume AI Subpackage Chat Groups API and Hume AI Subpackage Chats API, and 7 more.

Is there an OpenAPI specification for the Hume AI API?

Yes. APIs.io indexes 10 OpenAPI specifications for Hume AI, each linked for download from this page.

How do I authenticate with the Hume AI API?

Hume AI uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as Hume Ai Authentication.

How much does the Hume AI API cost?

APIs.io lists 8 pricing plans for Hume AI, with each plan's price, limits and inclusions under Pricing on this page.

Is the Hume AI API ready for AI agents?

Hume AI has a Kin Score of 30.9 out of 100 (thin) and an Agent Readiness score of 30.2 (agent-ready), scored by API Evangelist on 2026-11-06.

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