Flatcar Container Linux website screenshot

Flatcar Container Linux

Flatcar Container Linux is a CNCF incubating minimal, immutable Linux distribution designed for running containers. It provides automatic atomic updates through the Nebraska update server, ensuring nodes stay secure and consistent. Flatcar supports Kubernetes deployments on bare metal, cloud, and virtual environments with a focus on security and operational simplicity.

Flatcar Container Linux publishes 8 APIs on the APIs.io network, including Activity API, Apps API, Channels API, and 5 more. Tagged areas include Cloud Native, Containers, Immutable Infrastructure, Incubating, and Linux.

Flatcar Container Linux’s developer surface includes authentication, documentation, release notes, engineering blog, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub
39.2/100 thin ▬ flat Agent 41/100 agent ready Full breakdown ↓
scored 2026-08-03 · rubric v0.9
AccessFreemiumSelf serve⚡ Free to try
8 APIs
Cloud NativeContainersImmutable InfrastructureIncubatingLinuxOperating System

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-03 · rubric v0.9
Composite quality — 39.2/100 · thin
Contract Quality 11.9 / 25
Developer Ergonomics 5.2 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 6.8 / 13
Governance 0.0 / 12
Discoverability 7.4 / 10
Agent readiness — 41/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 7 / 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
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/flatcar-container-linux: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 8

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

Flatcar Container Linux Activity API

The Activity API from Flatcar Container Linux — 1 operation(s) for activity.

Flatcar Container Linux Apps API

The Apps API from Flatcar Container Linux — 17 operation(s) for apps.

Flatcar Container Linux Channels API

The Channels API from Flatcar Container Linux — 2 operation(s) for channels.

Flatcar Container Linux Config API

The Config API from Flatcar Container Linux — 1 operation(s) for config.

Flatcar Container Linux Health API

The Health API from Flatcar Container Linux — 1 operation(s) for health.

Flatcar Container Linux Instances API

The Instances API from Flatcar Container Linux — 1 operation(s) for instances.

Flatcar Container Linux Login API

The Login API from Flatcar Container Linux — 3 operation(s) for login.

Flatcar Container Linux Update API

The Update API from Flatcar Container Linux — 1 operation(s) for update.

Scroll for all 8

Open Collections 1

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

Nebraska

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Flatcar Container Linux Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Flatcar Container Linux Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Flatcar Container Linux Finops

FINOPS

Security Posture 2

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

Flatcar Container Linux Authentication

apiKey/http · 3 schemes

SECURITY

Flatcar Container Linux Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Flatcar Container Linux Agentic Access

40 operations · 17 acting

40 operations · 17 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 SourceCode
SourceCode

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

ReleaseNotes
ReleaseNotes
 Community
Community

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

NebraskaSource
NebraskaSource

Source (apis.yml)

apis.yml Raw ↑ 
aid: flatcar-container-linux
name: Flatcar Container Linux
description: Flatcar Container Linux is a CNCF incubating minimal, immutable Linux distribution designed for running containers.
  It provides automatic atomic updates through the Nebraska update server, ensuring nodes stay secure and consistent. Flatcar
  supports Kubernetes deployments on bare metal, cloud, and virtual environments with a focus on security and operational
  simplicity.
url: https://raw.githubusercontent.com/api-evangelist/flatcar-container-linux/refs/heads/main/apis.yml
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/flatcar-container-linux.png
tags:
- Cloud Native
- Containers
- Immutable Infrastructure
- Incubating
- Linux
- Operating System
created: '2026-03-16'
modified: '2026-05-19'
specificationVersion: '0.19'
type: Index
access: Open Source
position: Producer
apis:
- aid: flatcar-container-linux:flatcar-container-linux-activity-api
  name: Flatcar Container Linux Activity API
  description: The Activity API from Flatcar Container Linux — 1 operation(s) for activity.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Activity
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-activity-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-apps-api
  name: Flatcar Container Linux Apps API
  description: The Apps API from Flatcar Container Linux — 17 operation(s) for apps.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Apps
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-apps-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-channels-api
  name: Flatcar Container Linux Channels API
  description: The Channels API from Flatcar Container Linux — 2 operation(s) for channels.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Channels
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-channels-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-config-api
  name: Flatcar Container Linux Config API
  description: The Config API from Flatcar Container Linux — 1 operation(s) for config.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Config
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-config-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-health-api
  name: Flatcar Container Linux Health API
  description: The Health API from Flatcar Container Linux — 1 operation(s) for health.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-health-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-instances-api
  name: Flatcar Container Linux Instances API
  description: The Instances API from Flatcar Container Linux — 1 operation(s) for instances.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Instances
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-instances-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-login-api
  name: Flatcar Container Linux Login API
  description: The Login API from Flatcar Container Linux — 3 operation(s) for login.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Login
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-login-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
- aid: flatcar-container-linux:flatcar-container-linux-update-api
  name: Flatcar Container Linux Update API
  description: The Update API from Flatcar Container Linux — 1 operation(s) for update.
  humanURL: https://www.flatcar.org/docs/latest/nebraska/
  baseURL: https://nebraska.flatcar-linux.org/api
  tags:
  - Update
  properties:
  - type: OpenAPI
    url: openapi/flatcar-container-linux-update-api-openapi.yml
  - type: Documentation
    url: https://www.flatcar.org/docs/latest/nebraska/
  - type: SourceCode
    url: https://github.com/flatcar/nebraska
common:
- type: AgenticAccess
  url: agentic-access/flatcar-container-linux-agentic-access.yml
- type: DomainSecurity
  url: security/flatcar-container-linux-domain-security.yml
- type: Authentication
  url: authentication/flatcar-container-linux-authentication.yml
- type: Website
  url: https://www.flatcar.org
- type: Documentation
  url: https://www.flatcar.org/docs/latest/
- type: GitHubOrganization
  url: https://github.com/flatcar
- type: SourceCode
  url: https://github.com/flatcar/flatcar
- type: NebraskaSource
  url: https://github.com/flatcar/nebraska
- type: ReleaseNotes
  url: https://www.flatcar.org/releases/
- type: Community
  url: https://www.flatcar.org/community/
- url: https://www.flatcar.org/blog/index.xml
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
Where this information came from

This is an independent, third-party profile of Flatcar Container Linux, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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