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

48.7/100 developing ▬ flat Agent 26/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

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 2026-09-08 · rubric v0.20.0

Composite quality — 48.7/100 · developing

Contract Quality 10.4 / 25

Developer Ergonomics 14.3 / 20

Access Clarity 9.5 / 20

Operational Transparency 4.8 / 13

Contract Governance 2.2 / 12

Discoverability 7.6 / 10

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

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.

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 →

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

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