Smallest AI

Smallest AI builds ultra-low-latency voice infrastructure - the Waves text-to-speech engine (Lightning / Lightning v2 models) for realtime speech synthesis and instant voice cloning, plus the Atoms platform for building and deploying production voice agents. The Waves REST API at https://waves-api.smallest.ai/api/v1 generates speech with sub-100ms latency, supports SSE and WebSocket streaming, and exposes voice listing and cloning via a Bearer-authenticated interface.

Smallest AI publishes 3 APIs on the APIs.io network: Streaming API, Text to Speech API, and Voices API. Tagged areas include Artificial Intelligence, Text-to-Speech, Voice, Real-Time, and Voice Agents.

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

Smallest AI’s developer surface includes authentication, documentation, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub

43.1/100 developing ▬ flat Agent 21/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

Artificial Intelligence Text-to-Speech Voice Real-Time Voice Agents

Kin Score

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

Composite quality — 43.1/100 · developing

Contract Quality 14.4 / 23

Developer Ergonomics 5.1 / 18

Access Clarity 8.5 / 18

Operational Transparency 4.0 / 12

Contract Governance 1.2 / 11

Discoverability 6.2 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 21/100 · 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 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

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/smallest-ai: 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 4

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

Smallest AI Atoms (Voice Agents)

The Atoms platform for building, testing, and deploying production voice agents - orchestrating Waves TTS and Pulse STT with LLM-driven conversation flows, exposed through a dev...

Smallest AI Streaming API

Realtime streaming speech synthesis.

Smallest AI Text to Speech API

Synthesize speech from text.

Smallest AI Voices API

List prebuilt voices and manage cloned voices.

Open Collections 5

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

API Collection

OPEN COLLECTION

Smallest AI Waves Streaming API

OPEN COLLECTION

Smallest AI Waves Streaming Text to Speech API

OPEN COLLECTION

Smallest AI Waves Streaming Voices API

OPEN COLLECTION

Smallest AI Waves API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Smallest Ai Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Smallest Ai Rate Limits

3 limits

RATE LIMITS

FinOps 1

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

Smallest Ai Finops

FINOPS

Event Specifications 1

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

Smallest AI Waves Realtime TTS (WebSocket)

Realtime, bidirectional text-to-speech over WebSocket for the Smallest AI Waves Lightning v2 model. The client opens a WebSocket connection, sends one or more JSON text payloads...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Smallest AI API Rules

8 rules · 1 errors 7 warnings

SPECTRAL

Security Posture 4

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

Smallest Ai Authentication

http · 1 scheme

SECURITY

Smallest Ai Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Smallest Ai Vulnerability Disclosure

security.txt · contact published

SECURITY

Smallest Ai Trust Center

SOC 2, ISO 27001, HIPAA, GDPR

SECURITY

Agentic Access 1

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

Smallest Ai Agentic Access

6 operations · 4 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 4

Authentication, authorization, and security posture

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

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

Source (apis.yml)

aid: smallest-ai
url: https://raw.githubusercontent.com/api-evangelist/smallest-ai/refs/heads/main/apis.yml
name: Smallest AI
kind: company
description: Smallest AI builds ultra-low-latency voice infrastructure - the Waves text-to-speech engine (Lightning / Lightning
  v2 models) for realtime speech synthesis and instant voice cloning, plus the Atoms platform for building and deploying production
  voice agents. The Waves REST API at https://waves-api.smallest.ai/api/v1 generates speech with sub-100ms latency, supports
  SSE and WebSocket streaming, and exposes voice listing and cloning via a Bearer-authenticated interface.
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/icons/smallest-ai.png
tags:
- Artificial Intelligence
- Text-to-Speech
- Voice
- Real-Time
- Voice Agents
tags_raw:
- AI
- Text to Speech
- Voice
- Realtime
- Voice Agents
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.23'
apis:
- aid: smallest-ai:atoms-voice-agents
  name: Smallest AI Atoms (Voice Agents)
  tags:
  - Voice Agents
  - Atoms
  - Conversational AI
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://atoms-docs.smallest.ai/
  baseURL: https://atoms-api.smallest.ai
  properties:
  - url: https://atoms-docs.smallest.ai/
    type: Documentation
  description: The Atoms platform for building, testing, and deploying production voice agents - orchestrating Waves TTS and
    Pulse STT with LLM-driven conversation flows, exposed through a developer API and dashboard.
- aid: smallest-ai:smallest-ai-streaming-api
  name: Smallest AI Streaming API
  description: Realtime streaming speech synthesis.
  humanURL: https://docs.smallest.ai/waves/api-reference
  baseURL: https://waves-api.smallest.ai/api/v1
  tags:
  - Streaming
  properties:
  - type: OpenAPI
    url: openapi/smallest-ai-streaming-api-openapi.yml
  - type: Documentation
    url: https://docs.smallest.ai/waves/documentation/getting-started/introduction
  - type: APIReference
    url: https://docs.smallest.ai/waves/api-reference
  - type: Documentation
    url: https://docs.smallest.ai/waves/documentation/text-to-speech-lightning/streaming
  - type: AsyncAPI
    url: asyncapi/smallest-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.smallest.ai/waves/documentation/voice-cloning
- aid: smallest-ai:smallest-ai-text-to-speech-api
  name: Smallest AI Text to Speech API
  description: Synthesize speech from text.
  humanURL: https://docs.smallest.ai/waves/api-reference
  baseURL: https://waves-api.smallest.ai/api/v1
  tags:
  - Text-to-Speech
  tags_raw:
  - Text to Speech
  properties:
  - type: OpenAPI
    url: openapi/smallest-ai-text-to-speech-api-openapi.yml
  - type: Documentation
    url: https://docs.smallest.ai/waves/documentation/getting-started/introduction
  - type: APIReference
    url: https://docs.smallest.ai/waves/api-reference
  - type: Documentation
    url: https://docs.smallest.ai/waves/documentation/text-to-speech-lightning/streaming
  - type: AsyncAPI
    url: asyncapi/smallest-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.smallest.ai/waves/documentation/voice-cloning
- aid: smallest-ai:smallest-ai-voices-api
  name: Smallest AI Voices API
  description: List prebuilt voices and manage cloned voices.
  humanURL: https://docs.smallest.ai/waves/api-reference
  baseURL: https://waves-api.smallest.ai/api/v1
  tags:
  - Voices
  properties:
  - type: OpenAPI
    url: openapi/smallest-ai-voices-api-openapi.yml
  - type: Documentation
    url: https://docs.smallest.ai/waves/documentation/getting-started/introduction
  - type: APIReference
    url: https://docs.smallest.ai/waves/api-reference
  - type: Documentation
    url: https://docs.smallest.ai/waves/documentation/text-to-speech-lightning/streaming
  - type: AsyncAPI
    url: asyncapi/smallest-ai-asyncapi.yml
  - type: Documentation
    url: https://docs.smallest.ai/waves/documentation/voice-cloning
common:
- type: AgenticAccess
  url: agentic-access/smallest-ai-agentic-access.yml
- type: TrustCenter
  url: security/smallest-ai-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/smallest-ai-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/smallest-ai-domain-security.yml
- type: Authentication
  url: authentication/smallest-ai-authentication.yml
- type: GitHubOrganization
  url: https://github.com/smallest-inc
- type: LinkedIn
  url: https://www.linkedin.com/company/smallest
- type: Website
  url: https://smallest.ai/
- type: Documentation
  url: https://docs.smallest.ai/
- type: Plans
  url: plans/smallest-ai-plans-pricing.yml
- type: RateLimits
  url: rate-limits/smallest-ai-rate-limits.yml
- type: FinOps
  url: finops/smallest-ai-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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