Xayn (now Noxtua)

Xayn is a Berlin-based AI company founded in 2017 as XAIN out of research by Dr. Leif-Nissen Lundbaek and Prof. Michael Huth at Oxford and Imperial College London. Rebranded to Xayn in 2020, it built the Xaynet privacy-preserving federated learning framework and a privacy-protecting search and discovery engine. In February 2024 the company pivoted to legal AI and rebranded as Noxtua AG (noxtua.com), Europe's sovereign Legal AI for research, document analysis, and drafting, backed by a Series A of EUR 10M (2021, Global Brain/KDDI, with Earlybird) and a Series B of roughly EUR 81M led by legal publisher C.H. Beck. xayn.com is offline and the company publishes no public API or developer portal today; its former open-source SDKs and packages are archived.

Xayn (now Noxtua) is profiled on the APIs.io network. Tagged areas include Company, Artificial Intelligence, Legal Tech, Privacy, and Search.

Xayn (now Noxtua)’s developer surface includes engineering blog, support, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub
14.0/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs
CompanyArtificial IntelligenceLegal TechPrivacySearchFederated LearningMachine LearningGermany

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 14.0/100 · minimal
Contract Quality 0.0 / 25
Developer Ergonomics 1.3 / 20
Commercial Clarity 5.3 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 0/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
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/xayn: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Security Posture 2

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

Xayn Domain Security

TLSv1.3 · HSTS

SECURITY

Xayn Trust Center

trust center published

SECURITY

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages

Access & Security 3

Authentication, authorization, and security posture

TrustCenter
TrustCenter
 Compliance
Compliance
 DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support
Support

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: xayn
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/xayn.png
name: Xayn (now Noxtua)
description: Xayn is a Berlin-based AI company founded in 2017 as XAIN out of research by Dr. Leif-Nissen Lundbaek and Prof.
  Michael Huth at Oxford and Imperial College London. Rebranded to Xayn in 2020, it built the Xaynet privacy-preserving federated
  learning framework and a privacy-protecting search and discovery engine. In February 2024 the company pivoted to legal AI
  and rebranded as Noxtua AG (noxtua.com), Europe's sovereign Legal AI for research, document analysis, and drafting, backed
  by a Series A of EUR 10M (2021, Global Brain/KDDI, with Earlybird) and a Series B of roughly EUR 81M led by legal publisher
  C.H. Beck. xayn.com is offline and the company publishes no public API or developer portal today; its former open-source
  SDKs and packages are archived.
url: https://raw.githubusercontent.com/api-evangelist/xayn/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- earlybird
x-tier: stub
x-tier-reason: portfolio-lead
x-rebranded-to: noxtua
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Artificial Intelligence
- Legal Tech
- Privacy
- Search
- Federated Learning
- Machine Learning
- Germany
apis: []
common:
- type: Website
  url: https://www.noxtua.com/
- type: Blog
  url: https://www.noxtua.com/company/blog
- type: GitHubOrganization
  url: https://github.com/xaynetwork
- type: PrivacyPolicy
  url: https://www.noxtua.com/legal/data-privacy
- type: Support
  url: https://www.noxtua.com/faq
- type: TrustCenter
  url: security/xayn-trust-center.yml
- type: Compliance
  url: https://trust.noxtua.com/
- type: Packages
  url: packages/xayn-packages.yml
- type: DomainSecurity
  url: security/xayn-domain-security.yml
- type: LLMsTxt
  url: llms/xayn-llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 5
  pass: local-v1