Inworld AI
Inworld AI is a real-time voice AI infrastructure provider. The Inworld platform delivers text-to-speech, speech-to-text, an end-to-end speech-to-speech Realtime API, and an OpenAI- and Anthropic-compatible LLM Router behind one API surface and one billing relationship. Inworld's voice models lead the Artificial Analysis Speech Arena and are used to power voice agents, language-learning apps, AI companions, avatar experiences, game NPCs, and Twilio-backed phone agents. The platform supports instant and professional voice cloning, voice design from natural language, lipsync-grade phoneme alignment, on-premise TTS deployment, and zero-data-retention configurations for regulated workloads.
Reference-quality API operations across every facet — a rich contract, published governance, transparent operations, and machine-readable commercial terms.
API Evangelist profiles Inworld AI the way a machine reads it — 52 machine-readable artifacts across 6 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Inworld AI scores 70.4/100 (exemplar), with a separate agent-readiness read of 61/100 (agent native). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
How we profile Inworld AI
Each block below is one kind of artifact we hold for Inworld AI. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 6
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Inworld LLM Router API
Inworld LLM Router — OpenAI-and-Anthropic-compatible chat-completions endpoint that routes prompts across hundreds of provider models (OpenAI, Anthropic, Google, Meta, Mistral, ...
Inworld AI Models API
Discover available models.
Inworld AI Realtime API
Realtime speech-to-speech sessions.
Inworld AI Speech To Text API
Transcribe audio to text.
Inworld AI Text To Speech API
Synthesize speech from text using Inworld voice models.
Inworld AI Voices API
Voice cloning, design, and lifecycle.
Open Collections 5
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Inworld Models API
OPEN COLLECTIONInworld Realtime API
OPEN COLLECTIONInworld STT API
OPEN COLLECTIONInworld TTS API
OPEN COLLECTIONInworld Voice API
OPEN COLLECTIONPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Inworld Ai Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Inworld Ai Finops
FINOPSFeatures 24
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Scroll within the panel for all 24 ·
Event Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Inworld AI Runtime WebSocket APIs
AsyncAPI description of Inworld AI's publicly documented runtime WebSocket surface. Inworld exposes three independent WebSocket endpoints: * **TTS streaming** — bidirectional te...
ASYNCAPISemantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Inworld Ai Context
JSON-LDSpectral Rules 3
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
JSON Schema 2
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
InworldRouterChatCompletionRequest
JSON SCHEMAInworldTtsSynthesizeRequest
JSON SCHEMAExamples 3
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Security Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Inworld AI — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 4
Portal, sign-up, and the first successful call
Documentation 5
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Build 23
SDKs, sample code, and the tooling you integrate with
Scroll within the panel for all 23 ·
Access & Security 5
Authentication, authorization, and security posture
Operate 8
Status, limits, changes, and where to get help
Scroll within the panel for all 8 ·
Commercial 9
Pricing, plans, and the legal terms of use
Scroll within the panel for all 9 ·
Other 1
Properties that don't map to a standard resource type
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