MinIO

MinIO is a high-performance, S3-compatible object storage system built for large-scale AI, analytics, and cloud-native data infrastructure. Its API is a drop-in implementation of the Amazon S3 REST API (bucket and object operations, multipart uploads, versioning, object locking / WORM retention, lifecycle policies, replication, and encryption), authenticated with AWS Signature Version 4 using access-key/secret-key pairs. Alongside the S3 data API, MinIO ships an Admin API (madmin) for cluster, user, policy, and service management. It is distributed as open-source software and as the commercial AIStor product, deployed on Kubernetes via an operator and Helm charts, and driven through first-party SDKs for Go, Python, Java, JavaScript, .NET, C++, and Rust plus the `mc` command-line client.

MinIO publishes 2 APIs on the APIs.io network. Tagged areas include Object Storage, Storage, S3 Compatible, Cloud-Native, and Kubernetes.

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

MinIO’s developer surface includes documentation, API reference, getting-started guide, engineering blog, pricing, support, signup flow, and 25 more developer resources.

🌐 Visit website 📡 Source on GitHub

50.9/100 developing ▬ flat Agent 26/100 agent aware Front door AI 6/6 dominant saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

2 APIs 1 MCP Servers

Object Storage Storage S3 Compatible Cloud-Native Kubernetes Data InfrastructureAI StorageCompany

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 50.9/100 · developing

Contract Quality 8.3 / 21

Developer Ergonomics 12.1 / 17

Access Clarity 8.1 / 17

Operational Transparency 4.1 / 11

Contract Governance 1.9 / 10

Discoverability 6.4 / 9

Regulatory Posture 5.3 / 15

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 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 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

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/.

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/minio: 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 →

Standards implemented 1

Interfaces this provider implements that became standards by being copied rather than ratified. Each is profiled by the API Commons, and the evidence column says how the claim was established — not that it was made.

The S3 Interface

vendor matrix — publishes a compatibility table

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

APIs 2

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

MinIO S3-Compatible API

S3-compatible object storage REST API implementing Amazon S3 bucket and object operations (put/get/list/delete objects, multipart uploads, versioning, object locking, lifecycle,...

MinIO Admin API

Administrative API (madmin) for managing MinIO/AIStor clusters: users, groups, canned and IAM policies, service accounts, healing, cluster info, configuration, and service restart.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

MinIO MCP Server

Official Model Context Protocol server for interacting with MinIO / AIStor object stores. Ships as a container image; runs read-only by default and gates write, delete, and admi...

MCP SERVER

Event Specifications 1

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

Minio Bucket Notifications Webhooks

ASYNCAPI

Security Posture 4

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

Minio Authentication

signature-v4/sts/ldap/oidc · 4 schemes

SECURITY

Minio Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Minio Vulnerability Disclosure

contact published

SECURITY

Minio Trust Center

ISO 27001

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 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer

MCPServer

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

Conformance

ErrorCatalog

Lifecycle

Webhooks

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

Access & Security 7

Authentication, authorization, and security posture

TrustCenter

TrustCenter

Authentication

Authentication

DomainSecurity

DomainSecurity

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

Security

TrustCenter

TrustCenter

Compliance

Compliance

Scroll for all 7

Operate 2

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: minio
name: MinIO
description: MinIO is a high-performance, S3-compatible object storage system built for large-scale AI, analytics, and cloud-native
  data infrastructure. Its API is a drop-in implementation of the Amazon S3 REST API (bucket and object operations, multipart
  uploads, versioning, object locking / WORM retention, lifecycle policies, replication, and encryption), authenticated with
  AWS Signature Version 4 using access-key/secret-key pairs. Alongside the S3 data API, MinIO ships an Admin API (madmin)
  for cluster, user, policy, and service management. It is distributed as open-source software and as the commercial AIStor
  product, deployed on Kubernetes via an operator and Helm charts, and driven through first-party SDKs for Go, Python, Java,
  JavaScript, .NET, C++, and Rust plus the `mc` command-line client.
url: https://raw.githubusercontent.com/api-evangelist/minio/refs/heads/main/apis.yml
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
  - security
  - sandbox
  generated: '2026-09-03'
  method: derived
image: https://github.com/minio.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- general-catalyst
- softbank-vision-fund
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Object Storage
- Storage
- S3 Compatible
- Cloud-Native
- Kubernetes
- Data Infrastructure
- AI Storage
- Company
tags_raw:
- Object Storage
- Storage
- S3 Compatible
- Cloud Native
- Kubernetes
- Data Infrastructure
- AI Storage
- Company
apis:
- name: MinIO S3-Compatible API
  description: S3-compatible object storage REST API implementing Amazon S3 bucket and object operations (put/get/list/delete
    objects, multipart uploads, versioning, object locking, lifecycle, replication), authenticated with AWS Signature Version
    4.
  humanURL: https://min.io/product/s3-compatibility
  baseURL: https://play.min.io
  tags:
  - Object Storage
  - S3 Compatible
  properties:
  - type: Documentation
    url: https://min.io/docs
- name: MinIO Admin API
  description: 'Administrative API (madmin) for managing MinIO/AIStor clusters: users, groups, canned and IAM policies, service
    accounts, healing, cluster info, configuration, and service restart.'
  humanURL: https://github.com/minio/madmin-go
  baseURL: https://play.min.io
  tags:
  - Administration
  - Object Storage
common:
- type: Website
  url: https://www.min.io/
- type: TrustCenter
  url: security/minio-trust-center.yml
- type: DeveloperPortal
  url: https://min.io/docs
- type: Documentation
  url: https://min.io/docs
- type: APIReference
  url: https://min.io/product/s3-compatibility
- type: GettingStarted
  url: https://min.io/docs/minio/linux/index.html
- type: GitHubOrganization
  url: https://github.com/minio
- type: Blog
  url: https://blog.min.io
- type: Pricing
  url: https://min.io/pricing
- type: Support
  url: https://subnet.min.io
- type: SignUp
  url: https://subnet.min.io/login
- type: Packages
  url: packages/minio-packages.yml
- type: SDKs
  url: packages/minio-packages.yml
- type: CLI
  url: cli/minio-cli.yml
- type: MCPServer
  url: mcp/minio-mcp.yml
- type: LLMsTxt
  url: llms/minio-llms.txt
- type: WellKnown
  url: well-known/minio-well-known.yml
- type: Authentication
  url: authentication/minio-authentication.yml
- type: Conventions
  url: conventions/minio-conventions.yml
- type: Conformance
  url: conformance/minio-conformance.yml
- type: ErrorCatalog
  url: errors/minio-error-codes.yml
- type: Lifecycle
  url: lifecycle/minio-lifecycle.yml
- type: ChangeLog
  url: changelog/minio-changelog.yml
- type: Sandbox
  url: sandbox/minio-sandbox.yml
- type: DomainSecurity
  url: security/minio-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/minio-vulnerability-disclosure.yml
- type: Security
  url: security/minio-vulnerability-disclosure.yml
- type: TrustCenter
  url: security/minio-trust-center.yml
- type: Compliance
  url: https://trust.min.io/
- type: Webhooks
  url: asyncapi/minio-bucket-notifications-webhooks.yml
- type: TermsOfService
  url: https://www.min.io/legal/aistor-free-agreement
- type: PrivacyPolicy
  url: https://www.min.io/legal/privacy-policy
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 15
  pass: local-v1

Work with this as data

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get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
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