Inworld AI

Inworld AI provides voice and conversational AI building blocks for games and interactive media. Public APIs cover Text-to-Speech, Speech-to-Text, a Realtime speech-to-speech API, and an LLM Router that fronts 220+ third-party models with unified billing.

Inworld AI publishes 10 API contracts indexed on the APIs.io network, including Models API, Realtime API, Router API, and 7 more. Tagged areas include Artificial Intelligence, Voice, Characters, Games, and Conversational AI.

The Inworld AI catalog on APIs.io includes 1 Spectral governance ruleset.

Inworld AI’s developer surface includes engineering blog, authentication, documentation, and 12 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

31.4/100 thin ▬ flat Agent 23/100 agent aware Front door AI 6/6 dominant Heartbeat 84/100 alive saas Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Artificial Intelligence Voice Characters Games Conversational AI A2A

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 31.4/100 · thin

Contract Quality 9.1 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 3.9 / 15

Operational Transparency 1.0 / 10

Contract Governance 1.2 / 9

Discoverability 5.5 / 8

Regulatory Posture 2.3 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 23/100 · agent aware

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 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 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 0 / 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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
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)
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

8 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 23.8 — up to +15.2 composite points
Access Clarity scores 26.3 — up to +14.7 composite points
Contract Quality scores 48.4 — up to +12.9 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/inworld/apis.yml: open an issue on github.com/api-evangelist/inworld 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	34.5 (thin)	-	2

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 2

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.

Agent2Agent

measured — observed by APIs.io (flavored)

OpenAPI

measured — observed by APIs.io (published)

APIs 10

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

Inworld Text-to-Speech API

TTS-2 and TTS-1.5 (Max/Mini) models for character voice synthesis. Priced per 1M characters with plan-tier discounts.

Inworld Speech-to-Text API

Multi-provider transcription API priced at $0.35/hour standard rate.

Inworld Realtime API

Low-latency speech-to-speech voice API for natural conversation experiences. Included with all plans.

Inworld LLM Router API

Routing layer over 220+ LLM models, billed at provider cost via Inworld's unified API.

Inworld AI Models API

Available models

Inworld AI Realtime API

Realtime speech-to-speech

Inworld AI Router API

LLM Router configurations

Inworld AI STT API

Speech-to-Text transcription

Inworld AI TTS API

Text-to-Speech synthesis

Inworld AI Voices API

Voice catalog and custom voice management

Scroll for all 10

Open Collections 7

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

Inworld AI Models API

OPEN COLLECTION

Inworld AI Models Realtime API

OPEN COLLECTION

Inworld AI Models Router API

OPEN COLLECTION

Inworld AI Models STT API

OPEN COLLECTION

Inworld AI Models TTS API

OPEN COLLECTION

Inworld AI Models Voices API

OPEN COLLECTION

Inworld AI API

OPEN COLLECTION

Scroll for all 7

Pricing Plans 1

Published pricing tiers and plan structures.

Inworld Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Inworld Rate Limits

4 limits

RATE LIMITS

FinOps 1

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

Inworld Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Inworld AI API Rules

53 rules · 48 errors 4 warnings 1 info

SPECTRAL

Security Posture 3

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

Inworld Authentication

http · 1 scheme

SECURITY

Inworld Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Inworld Trust Center

SOC 2, HIPAA, GDPR

SECURITY

Agentic Access 1

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

Inworld Agentic Access

19 operations · 13 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

TrustCenter

TrustCenter

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 4

The organization behind the API

Blog

Blog

BlogRSS

BlogRSS

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

AgentCard

AgentCard

Source (apis.yml)

aid: inworld
url: https://raw.githubusercontent.com/api-evangelist/inworld/refs/heads/main/apis.yml
name: Inworld AI
kind: company
description: Inworld AI provides voice and conversational AI building blocks for games and interactive media. Public APIs
  cover Text-to-Speech, Speech-to-Text, a Realtime speech-to-speech API, and an LLM Router that fronts 220+ third-party models
  with unified billing.
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: '2026-11-02'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Artificial Intelligence
- Voice
- Characters
- Games
- Conversational AI
- A2A
tags_raw:
- AI
- Voice
- Characters
- Games
- Conversational
- A2A
created: '2026-05-08'
modified: '2026-10-06'
specificationVersion: '0.23'
apis:
- aid: inworld:tts
  name: Inworld Text-to-Speech API
  description: TTS-2 and TTS-1.5 (Max/Mini) models for character voice synthesis. Priced per 1M characters with plan-tier
    discounts.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.inworld.ai/docs/tts
  baseURL: https://api.inworld.ai
  tags:
  - Text-to-Speech
  - Speech Synthesis
  - Character Voice
  tags_raw:
  - TTS
  - Speech Synthesis
  - Character Voice
  properties:
  - type: Documentation
    url: https://docs.inworld.ai/docs/tts
  - type: Pricing
    url: https://inworld.ai/pricing
- aid: inworld:stt
  name: Inworld Speech-to-Text API
  description: Multi-provider transcription API priced at $0.35/hour standard rate.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.inworld.ai/docs/stt
  baseURL: https://api.inworld.ai
  tags:
  - STT
  - Transcription
  properties:
  - type: Documentation
    url: https://docs.inworld.ai/docs/stt
- aid: inworld:realtime
  name: Inworld Realtime API
  description: Low-latency speech-to-speech voice API for natural conversation experiences. Included with all plans.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.inworld.ai/docs/realtime
  baseURL: https://api.inworld.ai
  tags:
  - Real-Time
  - Speech to Speech
  - Voice
  tags_raw:
  - Realtime
  - Speech-to-Speech
  - Voice
  properties:
  - type: Documentation
    url: https://docs.inworld.ai/docs/realtime
- aid: inworld:llm-router
  name: Inworld LLM Router API
  description: Routing layer over 220+ LLM models, billed at provider cost via Inworld's unified API.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.inworld.ai/docs/llm-router
  baseURL: https://api.inworld.ai
  tags:
  - LLM
  - Router
  - Inference
  properties:
  - type: Documentation
    url: https://docs.inworld.ai/docs/llm-router
- aid: inworld:inworld-models-api
  name: Inworld AI Models API
  description: Available models
  humanURL: https://docs.inworld.ai/docs/tts
  baseURL: https://api.inworld.ai
  tags:
  - Models
  properties:
  - type: OpenAPI
    url: openapi/inworld-models-api-openapi.yml
- aid: inworld:inworld-realtime-api
  name: Inworld AI Realtime API
  description: Realtime speech-to-speech
  humanURL: https://docs.inworld.ai/docs/tts
  baseURL: https://api.inworld.ai
  tags:
  - Real-Time
  tags_raw:
  - Realtime
  properties:
  - type: OpenAPI
    url: openapi/inworld-realtime-api-openapi.yml
- aid: inworld:inworld-router-api
  name: Inworld AI Router API
  description: LLM Router configurations
  humanURL: https://docs.inworld.ai/docs/tts
  baseURL: https://api.inworld.ai
  tags:
  - Router
  properties:
  - type: OpenAPI
    url: openapi/inworld-router-api-openapi.yml
- aid: inworld:inworld-stt-api
  name: Inworld AI STT API
  description: Speech-to-Text transcription
  humanURL: https://docs.inworld.ai/docs/tts
  baseURL: https://api.inworld.ai
  tags:
  - STT
  properties:
  - type: OpenAPI
    url: openapi/inworld-stt-api-openapi.yml
- aid: inworld:inworld-tts-api
  name: Inworld AI TTS API
  description: Text-to-Speech synthesis
  humanURL: https://docs.inworld.ai/docs/tts
  baseURL: https://api.inworld.ai
  tags:
  - Text-to-Speech
  tags_raw:
  - TTS
  properties:
  - type: OpenAPI
    url: openapi/inworld-tts-api-openapi.yml
- aid: inworld:inworld-voices-api
  name: Inworld AI Voices API
  description: Voice catalog and custom voice management
  humanURL: https://docs.inworld.ai/docs/tts
  baseURL: https://api.inworld.ai
  tags:
  - Voice
  tags_raw:
  - Voices
  properties:
  - type: OpenAPI
    url: openapi/inworld-voices-api-openapi.yml
common:
- url: https://inworld.ai/blog
  type: Blog
- url: https://inworld.ai/blog/rss.xml
  type: BlogRSS
- type: AgentCard
  url: a2a/inworld-a2a.yml
  name: A2A Agent Card
  description: Agent Card served at /.well-known/agent-card.json (flavored against A2A 1.0.0).
- type: AgenticAccess
  url: agentic-access/inworld-agentic-access.yml
- type: TrustCenter
  url: security/inworld-trust-center.yml
- type: DomainSecurity
  url: security/inworld-domain-security.yml
- type: Authentication
  url: authentication/inworld-authentication.yml
- type: GitHubOrganization
  url: https://github.com/inworld-ai
- type: LinkedIn
  url: https://www.linkedin.com/company/inworld-ai
- type: Website
  url: https://inworld.ai/
- type: Documentation
  url: https://docs.inworld.ai/
- type: Plans
  url: plans/inworld-plans-pricing.yml
- type: RateLimits
  url: rate-limits/inworld-rate-limits.yml
- type: FinOps
  url: finops/inworld-finops.yml
- type: LlmsText
  url: https://docs.inworld.ai/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Inworld AI API — frequently asked questions

Does Inworld AI have an API?

Yes. APIs.io lists 10 APIs from Inworld AI, including Inworld Text-to-Speech API, Inworld Speech-to-Text API and Inworld Realtime API, and 7 more.

Is there an OpenAPI specification for the Inworld AI API?

Yes. APIs.io indexes 6 OpenAPI specifications for Inworld AI, each linked for download from this page.

How do I authenticate with the Inworld AI API?

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

How much does the Inworld AI API cost?

APIs.io lists 5 pricing plans for Inworld AI, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Inworld AI API ready for AI agents?

Inworld AI has a Kin Score of 31.4 out of 100 (thin) and an Agent Readiness score of 22.7 (agent-aware), scored by API Evangelist on 2026-11-02.

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