Cubbit

Cubbit is a European cloud storage provider offering DS3, a sovereign, geo-distributed, S3-compatible object storage platform. DS3 encrypts (AES-256), fragments, and replicates data across multiple user-selected locations using Reed-Solomon erasure coding, delivering geo-resilience and data sovereignty within Europe. It ships in two forms: DS3 Cloud, a ready-to-use managed geo-redundant object store (TBs to PBs), and DS3 Composer, self-hosted software-defined storage you run on your own hardware (200 TB+). The storage plane exposes an AWS S3-compatible API at https://s3.cubbit.eu (region eu-west-1), authenticated with access key / secret key and AWS Signature Version 4, so existing S3 SDKs, the AWS CLI, rclone, Cyberduck, Veeam and other S3 tooling work unchanged. Cubbit is certified to ISO/IEC 27001, 27017, 27018, 9001, 20000-1 and 22301, and is GDPR- and NIS2-aligned with Italian ACN PA Cloud qualification.

Cubbit is listed with 1 API on the APIs.io network. Tagged areas include Object Storage, Cloud Storage, S3 Compatible, Storage, and Data Sovereignty.

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

🌐 Visit website 📡 Profile data on GitHub

39.0/100 thin ▬ flat Agent 3/100 human only Front door AI 2/6 trace saas Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

1 API

Object Storage Cloud Storage S3 Compatible Storage Data SovereigntyGeo-DistributedInfrastructure Company

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 39.0/100 · thin

Contract Quality 0.0 / 21

Developer Ergonomics 12.1 / 17

Access Clarity 8.1 / 17

Operational Transparency 2.3 / 11

Contract Governance 1.9 / 10

Discoverability 6.2 / 9

Regulatory Posture 5.3 / 15

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 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 0 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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<a href="https://apis.io/providers/cubbit/"><img src="https://apis.io/badge/cubbit/card.svg" alt="Cubbit on APIs.io — Kin Score by API Evangelist"></a>

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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/cubbit: 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Object Storage	undeclared	-	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

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.

The S3 Interface

prose — states compatibility; nothing published to check it against

8 core of 116 operations graded · api-commons/storage

APIs 1

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

Cubbit DS3 S3-Compatible API

The AWS S3-compatible object storage API for Cubbit DS3. Supports bucket create/delete/list, object upload/download/copy/delete, multipart upload, object versioning, object lock...

Security Posture 4

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

Cubbit Authentication

awsSigV4 · 1 scheme

SECURITY

Cubbit Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Cubbit Vulnerability Disclosure

contact published

SECURITY

Cubbit Trust Center

ISO/IEC 27001:2022, ISO/IEC 27017:2015, ISO/IEC 27018:2019, ISO 9001:2015, ISO/IEC 20000-1:2018, ISO 22301:2019, ACN PA Cloud Qualification, GDPR, NIS2

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

GettingStarted

SignUp

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Lifecycle

Conventions

ErrorCatalog

DataModel

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

CLI

CLI

Access & Security 6

Authentication, authorization, and security posture

DomainSecurity

Authentication

Compliance

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

Operate 2

Status, limits, changes, and where to get help

Support

Support

StatusPage

StatusPage

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

BlogRSS

BlogRSS

Website

Website

Blog

Blog

Source (apis.yml)

aid: cubbit
name: Cubbit
description: 'Cubbit is a European cloud storage provider offering DS3, a sovereign, geo-distributed, S3-compatible object
  storage platform. DS3 encrypts (AES-256), fragments, and replicates data across multiple user-selected locations using Reed-Solomon
  erasure coding, delivering geo-resilience and data sovereignty within Europe. It ships in two forms: DS3 Cloud, a ready-to-use
  managed geo-redundant object store (TBs to PBs), and DS3 Composer, self-hosted software-defined storage you run on your
  own hardware (200 TB+). The storage plane exposes an AWS S3-compatible API at https://s3.cubbit.eu (region eu-west-1), authenticated
  with access key / secret key and AWS Signature Version 4, so existing S3 SDKs, the AWS CLI, rclone, Cyberduck, Veeam and
  other S3 tooling work unchanged. Cubbit is certified to ISO/IEC 27001, 27017, 27018, 9001, 20000-1 and 22301, and is GDPR-
  and NIS2-aligned with Italian ACN PA Cloud qualification.'
url: https://raw.githubusercontent.com/api-evangelist/cubbit/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- techstars
x-tier: profiled
x-tier-reason: enrichment-pipeline
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - 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
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
image: https://cdn.prod.website-files.com/67a4c547ac46cdf433fcc313/67c76518961dec2a8b897c21_og-homepage.webp
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-09-24
tags:
- Object Storage
- Cloud Storage
- S3 Compatible
- Storage
- Data Sovereignty
- Geo-Distributed
- Infrastructure
- Company
apis:
- name: Cubbit DS3 S3-Compatible API
  description: The AWS S3-compatible object storage API for Cubbit DS3. Supports bucket create/delete/list, object upload/download/copy/delete,
    multipart upload, object versioning, object lock (COMPLIANCE and GOVERNANCE retention plus legal hold), and object tagging.
    Authenticated with access key ID and secret access key using AWS Signature Version 4 against the s3.cubbit.eu endpoint
    (region eu-west-1); custom tenants use s3.<tenant>.cubbit.eu.
  humanURL: https://docs.cubbit.io/guides/s3-api
  baseURL: https://s3.cubbit.eu
  properties:
  - type: Documentation
    url: https://docs.cubbit.io/guides/s3-api
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://blog.cubbit.io/rss/
  type: BlogRSS
- type: DomainSecurity
  url: security/cubbit-domain-security.yml
- type: Website
  url: https://cubbit.io/
- type: DeveloperPortal
  url: https://docs.cubbit.io/
- type: Documentation
  url: https://docs.cubbit.io/
- type: APIReference
  url: https://docs.cubbit.io/guides/s3-api
- type: GettingStarted
  url: https://docs.cubbit.io/getting-started/quickstart
- type: Support
  url: https://www.cubbit.io/support
- type: Blog
  url: https://blog.cubbit.io/
- type: StatusPage
  url: https://status.cubbit.io/
- type: GitHubOrganization
  url: https://github.com/cubbit
- type: Pricing
  url: https://www.cubbit.io/pricing
- type: SignUp
  url: https://console.cubbit.eu/signin
- type: TermsOfService
  url: https://www.cubbit.io/legal/ds3-terms-of-service
- type: PrivacyPolicy
  url: https://www.cubbit.io/legal/privacy-policy
- type: Authentication
  url: authentication/cubbit-authentication.yml
- type: Lifecycle
  url: lifecycle/cubbit-lifecycle.yml
- type: Conventions
  url: conventions/cubbit-conventions.yml
- type: ErrorCatalog
  url: errors/cubbit-error-codes.yml
- type: Packages
  url: packages/cubbit-packages.yml
- type: CLI
  url: cli/cubbit-cli.yml
- type: Sandbox
  url: sandbox/cubbit-sandbox.yml
- type: DataModel
  url: data-model/cubbit-data-model.yml
- type: LLMsTxt
  url: llms/cubbit-llms.txt
- type: Conformance
  url: conformance/cubbit-conformance.yml
- type: Compliance
  url: https://www.cubbit.io/legal/certifications
- type: TrustCenter
  url: security/cubbit-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/cubbit-vulnerability-disclosure.yml
- type: Security
  url: https://www.cubbit.io/bug-bounty-program
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

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