KugelAudio website screenshot

KugelAudio

KugelAudio is a Y Combinator-backed, Germany-based voice AI company (KugelAudio GmbH) offering low-latency text-to-speech built, trained, and hosted entirely in the European Union. Its kugel-3 and kugel-2-turbo models produce natural speech in 26+ languages with accent and dialect coverage, voice cloning from a short reference sample, per-project pronunciation dictionaries with IPA support, word-level timestamps, and inline break, spell, and prosody tags. The platform positions EU data sovereignty as its core differentiator, operating outside the reach of the US CLOUD Act and offering a direct EU endpoint plus on-premise and dedicated deployment. The developer surface is a REST API for generation, voices, models, and dictionaries plus three WebSocket streaming channels tuned for real-time voice agents, including token-by-token input, barge-in, and up to 20 concurrent contexts per connection. Drop-in compatibility surfaces let ElevenLabs-compatible SDKs, LiveKit, PipeCat, and Vapi integrations point at KugelAudio without rewrites.

KugelAudio publishes 14 APIs on the APIs.io network, including 11labs API, Audio API, billing API, and 11 more. Tagged areas include Voice, Text-to-Speech, Speech Synthesis, Voice AI, and Voice Cloning.

The KugelAudio catalog on APIs.io includes 1 event-driven AsyncAPI specification.

KugelAudio’s developer surface includes documentation, API reference, getting-started guide, support, pricing, signup flow, authentication, and 22 more developer resources.

🌐 Visit website 📡 Source on GitHub
48.1/100 developing ▬ flat Agent 29/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0
1 APIs
VoiceText-to-SpeechSpeech SynthesisVoice AIVoice CloningAudioArtificial IntelligenceMachine-LearningStreamingReal-TimeConversational AIEuropeData SovereigntyGDPRCompany

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0
Composite quality — 48.1/100 · developing
Contract Quality 13.0 / 23
Developer Ergonomics 12.4 / 18
Access Clarity 7.1 / 18
Operational Transparency 3.1 / 12
Contract Governance 0.5 / 11
Discoverability 6.8 / 9
Create-or-Update Ergonomics 1.1 / 10
Agent readiness — 29/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 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/kugelaudio: 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 14

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

KugelAudio 11labs API

The 11labs API from KugelAudio — 6 operation(s) for 11labs.

KugelAudio Audio API

The Audio API from KugelAudio — 1 operation(s) for audio.

KugelAudio billing API

The billing API from KugelAudio — 2 operation(s) for billing.

KugelAudio Dictionaries API

The Dictionaries API from KugelAudio — 5 operation(s) for dictionaries.

KugelAudio Health API

The Health API from KugelAudio — 1 operation(s) for health.

KugelAudio license API

The license API from KugelAudio — 12 operation(s) for license.

KugelAudio Models API

The Models API from KugelAudio — 1 operation(s) for models.

KugelAudio Normalize API

The Normalize API from KugelAudio — 1 operation(s) for normalize.

KugelAudio Post Overrides API

The Post Overrides API from KugelAudio — 1 operation(s) for post overrides.

KugelAudio Predict API

The Predict API from KugelAudio — 1 operation(s) for predict.

KugelAudio Ready API

The Ready API from KugelAudio — 1 operation(s) for ready.

KugelAudio Tts API

The Tts API from KugelAudio — 1 operation(s) for tts.

KugelAudio Vapi API

The Vapi API from KugelAudio — 1 operation(s) for vapi.

KugelAudio Voices API

The Voices API from KugelAudio — 6 operation(s) for voices.

Scroll for all 14

Open Collections 15

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

API Collection

OPEN COLLECTION

KugelAudio TTS 11labs API

OPEN COLLECTION

KugelAudio TTS 11labs Audio API

OPEN COLLECTION

KugelAudio TTS 11labs billing API

OPEN COLLECTION

KugelAudio TTS 11labs Dictionaries API

OPEN COLLECTION

KugelAudio TTS 11labs Health API

OPEN COLLECTION

KugelAudio TTS 11labs license API

OPEN COLLECTION

KugelAudio TTS 11labs Models API

OPEN COLLECTION

KugelAudio TTS 11labs Normalize API

OPEN COLLECTION

KugelAudio TTS 11labs Post Overrides API

OPEN COLLECTION

KugelAudio TTS 11labs Predict API

OPEN COLLECTION

KugelAudio TTS 11labs Ready API

OPEN COLLECTION

KugelAudio 11labs Tts API

OPEN COLLECTION

KugelAudio TTS 11labs Vapi API

OPEN COLLECTION

KugelAudio TTS 11labs Voices API

OPEN COLLECTION

Scroll for all 15

Event Specifications 1

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

KugelAudio TTS Streaming API

API Evangelist description of KugelAudio's documented WebSocket streaming surface. KugelAudio publishes no AsyncAPI document of its own; this file is GENERATED from the provider...

ASYNCAPI

Security Posture 2

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

Kugelaudio Authentication

apiKey/http · 3 schemes

SECURITY

Kugelaudio Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Login
Login

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

X-MCPServerCandidate
X-MCPServerCandidate
 WellKnown
WellKnown
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

ErrorCatalog
ErrorCatalog
 Conventions
Conventions
 Lifecycle
Lifecycle
 Conformance
Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 3

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage
 Deprecation
Deprecation

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 1

The organization behind the API

Website
Website

Other 3

Properties that don't map to a standard resource type

CapabilityMap
CapabilityMap
 Overlay
Overlay
 APICatalog
APICatalog

Source (apis.yml)

apis.yml Raw ↑ 
aid: kugelaudio
name: KugelAudio
description: KugelAudio is a Y Combinator-backed, Germany-based voice AI company (KugelAudio GmbH) offering low-latency text-to-speech
  built, trained, and hosted entirely in the European Union. Its kugel-3 and kugel-2-turbo models produce natural speech in
  26+ languages with accent and dialect coverage, voice cloning from a short reference sample, per-project pronunciation dictionaries
  with IPA support, word-level timestamps, and inline break, spell, and prosody tags. The platform positions EU data sovereignty
  as its core differentiator, operating outside the reach of the US CLOUD Act and offering a direct EU endpoint plus on-premise
  and dedicated deployment. The developer surface is a REST API for generation, voices, models, and dictionaries plus three
  WebSocket streaming channels tuned for real-time voice agents, including token-by-token input, barge-in, and up to 20 concurrent
  contexts per connection. Drop-in compatibility surfaces let ElevenLabs-compatible SDKs, LiveKit, PipeCat, and Vapi integrations
  point at KugelAudio without rewrites.
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: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://www.kugelaudio.com/icon.png
url: https://raw.githubusercontent.com/api-evangelist/kugelaudio/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Voice
- Text-to-Speech
- Speech Synthesis
- Voice AI
- Voice Cloning
- Audio
- Artificial Intelligence
- Machine-Learning
- Streaming
- Real-Time
- Conversational AI
- Europe
- Data Sovereignty
- GDPR
- Company
tags_raw:
- Voice
- Text to Speech
- Speech Synthesis
- Voice AI
- Voice Cloning
- Audio
- Artificial Intelligence
- Machine Learning
- Streaming
- Real Time
- Conversational AI
- Europe
- Data Sovereignty
- GDPR
- Company
apis:
- aid: kugelaudio:kugelaudio-11labs-api
  name: KugelAudio 11labs API
  description: The 11labs API from KugelAudio — 6 operation(s) for 11labs.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - 11labs
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-11labs-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-audio-api
  name: KugelAudio Audio API
  description: The Audio API from KugelAudio — 1 operation(s) for audio.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Audio
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-audio-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-billing-api
  name: KugelAudio billing API
  description: The billing API from KugelAudio — 2 operation(s) for billing.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Billing
  tags_raw:
  - billing
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-billing-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-dictionaries-api
  name: KugelAudio Dictionaries API
  description: The Dictionaries API from KugelAudio — 5 operation(s) for dictionaries.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Dictionaries
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-dictionaries-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-health-api
  name: KugelAudio Health API
  description: The Health API from KugelAudio — 1 operation(s) for health.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-health-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-license-api
  name: KugelAudio license API
  description: The license API from KugelAudio — 12 operation(s) for license.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - License
  tags_raw:
  - license
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-license-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-models-api
  name: KugelAudio Models API
  description: The Models API from KugelAudio — 1 operation(s) for models.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Models
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-models-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-normalize-api
  name: KugelAudio Normalize API
  description: The Normalize API from KugelAudio — 1 operation(s) for normalize.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Normalize
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-normalize-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-post-overrides-api
  name: KugelAudio Post Overrides API
  description: The Post Overrides API from KugelAudio — 1 operation(s) for post overrides.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Post Overrides
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-post-overrides-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-predict-api
  name: KugelAudio Predict API
  description: The Predict API from KugelAudio — 1 operation(s) for predict.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Predict
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-predict-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-ready-api
  name: KugelAudio Ready API
  description: The Ready API from KugelAudio — 1 operation(s) for ready.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Ready
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-ready-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-tts-api
  name: KugelAudio Tts API
  description: The Tts API from KugelAudio — 1 operation(s) for tts.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - TTS
  tags_raw:
  - Tts
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-tts-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-vapi-api
  name: KugelAudio Vapi API
  description: The Vapi API from KugelAudio — 1 operation(s) for vapi.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Vapi
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-vapi-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
- aid: kugelaudio:kugelaudio-voices-api
  name: KugelAudio Voices API
  description: The Voices API from KugelAudio — 6 operation(s) for voices.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Voices
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-voices-api-openapi.yml
  - type: Documentation
    url: https://docs.kugelaudio.com/api-reference/introduction
  - type: AsyncAPI
    url: asyncapi/kugelaudio-tts-asyncapi.yml
  - type: DataModel
    url: data-model/kugelaudio-data-model.yml
common:
- type: CapabilityMap
  url: capabilities/kugelaudio-capability-edges.yml
  name: KugelAudio Business Capability Map
- type: X-MCPServerCandidate
  url: mcp/kugelaudio-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: Overlay
  url: overlays/kugelaudio-tts-overlay.yaml
- type: DomainSecurity
  url: security/kugelaudio-domain-security.yml
- type: Website
  url: https://www.kugelaudio.com
- type: DeveloperPortal
  url: https://docs.kugelaudio.com
- type: Documentation
  url: https://docs.kugelaudio.com
- type: APIReference
  url: https://docs.kugelaudio.com/api-reference/introduction
- type: GettingStarted
  url: https://docs.kugelaudio.com/quickstart
- type: Support
  url: mailto:hello@kugelaudio.com
- type: GitHubOrganization
  url: https://github.com/kugelaudio
- type: Pricing
  url: https://www.kugelaudio.com/#pricing
- type: SignUp
  url: https://www.kugelaudio.com/en/signup
- type: Login
  url: https://www.kugelaudio.com/en/signin
- type: TermsOfService
  url: https://www.kugelaudio.com/terms
- type: PrivacyPolicy
  url: https://www.kugelaudio.com/privacy
- type: StatusPage
  url: https://www.kugelaudio.com/status
- type: Deprecation
  url: https://docs.kugelaudio.com/api-reference/introduction
- type: Authentication
  url: authentication/kugelaudio-authentication.yml
- type: ErrorCatalog
  url: errors/kugelaudio-error-codes.yml
- type: Conventions
  url: conventions/kugelaudio-conventions.yml
- type: Lifecycle
  url: lifecycle/kugelaudio-lifecycle.yml
- type: Conformance
  url: conformance/kugelaudio-conformance.yml
- type: Packages
  url: packages/kugelaudio-packages.yml
- type: SDKs
  url: packages/kugelaudio-packages.yml
- type: WellKnown
  url: well-known/kugelaudio-well-known.yml
- type: APICatalog
  url: well-known/kugelaudio-api-catalog.json
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/kugelaudio-llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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