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 4 APIs on the APIs.io network. Tagged areas include AI, Voice, Characters, Games, and Conversational.

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

🌐 Visit website 📡 Source on GitHub

27.0/100 emerging ▼ -14.8 Agent 16/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

4 APIs

AIVoiceCharactersGamesConversational

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 27.0/100 · emerging

Contract Quality 2.0 / 25

Developer Ergonomics 3.9 / 20

Commercial Clarity 9.5 / 20

Operational Transparency 4.8 / 13

Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 16/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. 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. Want it done for you? Prioritized profiling — $2,500 →

APIs 4

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.

Open Collections 1

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

Inworld AI API

OPEN COLLECTION

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.

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.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- AI
- Voice
- Characters
- Games
- Conversational
created: '2026-05-08'
modified: '2026-05-08'
specificationVersion: '0.19'
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:
  - 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
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