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 6 API contracts indexed on the APIs.io network, including Dictionaries API, Models API, Voices API, and 3 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 and 1 Spectral governance ruleset.

KugelAudio’s developer surface includes engineering blog, documentation, API reference, getting-started guide, support, pricing, signup flow, and 24 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

57.8/100 strong ▬ flat Agent 29/100 agent ready Front door AI 3/6 light Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessPaid

1 published contract 1 Agent Skills

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

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

AI Model Services

AE-110

ElevenLabs compatibleText To Speech

POST /11labs/v1/text-to-speech/{voice_id} POST /v1/tts/generate

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 57.8/100 · strong

Contract Quality 11.2 / 19

Developer Ergonomics 10.7 / 15

Access Clarity 11.8 / 15

Operational Transparency 2.6 / 10

Contract Governance 1.6 / 9

Discoverability 5.5 / 8

Regulatory Posture 3.3 / 15

Create-or-Update Ergonomics 0.0 / 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

Pagination 0 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the AI & Biometrics regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 59.7 — up to +10.1 composite points
Contract Governance scores 18.2 — up to +9.8 composite points
Operational Transparency scores 26.3 — up to +9.6 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/kugelaudio/apis.yml: open an issue on github.com/api-evangelist/kugelaudio to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Agent Skills

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

KugelAudio Dictionaries API

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

KugelAudio Models API

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

KugelAudio Voices API

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

KugelAudio ElevenLabs compatible API

The ElevenLabs compatible API from KugelAudio — 5 operation(s) for elevenlabs compatible.

KugelAudio Projects API

The Projects API from KugelAudio — 4 operation(s) for projects.

KugelAudio Text to Speech API

The Text to Speech API from KugelAudio — 1 operation(s) for text to speech.

Open Collections 14

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

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 14

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

kugelaudio-api

AGENT SKILL

KugelAudio API pricing

Prices published by KugelAudio, read 2026-10-07 from www.kugelaudio.com/en#pricing.

Plan	Price
kugel-2-turbo	€0.035/ min excl. VAT Includes: ~40–50 ms TTFA, EU hosting, EU Sovereign Cloud (EU/EEA), normalizer, voice cloning, speed control, b
kugel-3	€0.07/ min excl. VAT Includes: ~60–80 ms TTFA, EU hosting, EU Sovereign Cloud (EU/EEA), normalizer, voice cloning, speed control, b
Enterprise	Talk to us Includes: On-premise & dedicated deployment, higher custom concurrency limits, 24/7 support, dedicated account

Plan details, limits and sources →

Billed by: audio minute · FinOps profile →

Pricing Plans 1

Published pricing tiers and plan structures.

Kugelaudio Plans Pricing

3 plans

PLANS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

KugelAudio

SLA

FinOps 1

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

Kugelaudio Finops

FINOPS

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

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

KugelAudio API Rules

57 rules · 50 errors 6 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Kugelaudio Tts Overlay

23 actions · servers · kugelaudio-tts-openapi-original.json

DERIVED

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

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

WellKnown

AgentSkill

LLMsTxt

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

ErrorCatalog

Conventions

Lifecycle

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 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 3

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Overlay

Overlay

APICatalog

APICatalog

Source (apis.yml)

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: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  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: '2026-10-06'
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
x-docs-hosting: vercel
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
- Machine-Learning
apis:
- 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-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-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:
  - Voice
  tags_raw:
  - 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
- aid: kugelaudio:kugelaudio-elevenlabs-compatible-api
  name: KugelAudio ElevenLabs compatible API
  description: The ElevenLabs compatible API from KugelAudio — 5 operation(s) for elevenlabs compatible.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - ElevenLabs compatible
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-elevenlabs-compatible-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-projects-api
  name: KugelAudio Projects API
  description: The Projects API from KugelAudio — 4 operation(s) for projects.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Project
  tags_raw:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-projects-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-text-to-speech-api
  name: KugelAudio Text to Speech API
  description: The Text to Speech API from KugelAudio — 1 operation(s) for text to speech.
  humanURL: https://docs.kugelaudio.com/api-reference/introduction
  baseURL: https://api.kugelaudio.com
  tags:
  - Text-to-Speech
  tags_raw:
  - Text to Speech
  properties:
  - type: OpenAPI
    url: openapi/kugelaudio-text-to-speech-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: Plans
  url: plans/kugelaudio-plans-pricing.yml
- url: https://www.kugelaudio.com/en/articles
  type: Blog
- 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

KugelAudio API — frequently asked questions

Does KugelAudio have an API?

Yes. APIs.io lists 6 APIs from KugelAudio, including KugelAudio Dictionaries API, KugelAudio Models API and KugelAudio Voices API, and 3 more.

Is there an OpenAPI specification for the KugelAudio API?

Yes. APIs.io indexes 6 OpenAPI specifications for KugelAudio, each linked for download from this page.

How do I authenticate with the KugelAudio API?

KugelAudio uses bearer-token authentication (apiKey/http · 3 schemes). The details are profiled on APIs.io as Kugelaudio Authentication.

How much does the KugelAudio API cost?

KugelAudio publishes its prices; its kugel-2-turbo plan is €0.035/ min excl. VAT as of 2026-10-07. APIs.io lists 3 pricing plans for KugelAudio, with each plan's price, limits and inclusions under Pricing on this page.

Is the KugelAudio API ready for AI agents?

KugelAudio has a Kin Score of 57.8 out of 100 (strong) and an Agent Readiness score of 29.3 (agent-ready), scored by API Evangelist on 2026-11-06.

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