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 6 APIs on the APIs.io network, including Models API, Realtime API, Router API, and 3 more. Tagged areas include Artificial Intelligence, Voice, Characters, Games, and Conversational.

Inworld AI’s developer surface includes authentication, documentation, and 11 more developer resources.

🌐 Visit website 📡 Source on GitHub

32.8/100 thin ▬ flat Agent 24/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

Artificial Intelligence Voice Characters Games Conversational

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 32.8/100 · thin

Contract Quality 12.1 / 23

Developer Ergonomics 3.9 / 18

Access Clarity 6.2 / 18

Operational Transparency 1.2 / 12

Contract Governance 0.0 / 11

Discoverability 6.8 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 24/100 · 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

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.

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 github.com/api-evangelist/inworld: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

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 8

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

API Collection

OPEN COLLECTION

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 8

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

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 2

The organization behind the API

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
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Artificial Intelligence
- Voice
- Characters
- Games
- Conversational
tags_raw:
- AI
- Voice
- Characters
- Games
- Conversational
created: '2026-05-08'
modified: '2026-05-08'
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:
  - 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:
  - 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:
  - Voices
  properties:
  - type: OpenAPI
    url: openapi/inworld-voices-api-openapi.yml
common:
- 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

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