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 AI, Text to Speech, Voice, Realtime, 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
45.7/100 developing ▼ -6.9 Agent 36/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemiumSelf serve⚡ Free to try
4 APIs
AIText to SpeechVoiceRealtimeVoice Agents

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 45.7/100 · developing
Contract Quality 17.6 / 25
Developer Ergonomics 3.9 / 20
Commercial Clarity 9.5 / 20
Operational Transparency 4.8 / 13
Governance 5.0 / 12
Discoverability 7.4 / 10
Agent readiness — 36/100 · agent ready
Machine-Readable Contract 18 / 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 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
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/smallest-ai: 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.

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 1

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

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

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
LinkedIn
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
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.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/smallest-ai.png
tags:
- AI
- Text to Speech
- Voice
- Realtime
- Voice Agents
created: '2026-06-21'
modified: '2026-06-21'
specificationVersion: '0.19'
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
  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