Helidon website screenshot

Helidon

Helidon is a collection of Java libraries from Oracle for writing microservices that run on a fast web core powered by Netty, supporting MicroProfile and reactive programming models.

Helidon publishes 4 APIs on the APIs.io network, including Health API, Info API, Metrics API, and 1 more. Tagged areas include Cloud Native, Frameworks, Java, MicroProfile, and Microservices.

The Helidon catalog on APIs.io includes 1 Spectral governance ruleset.

Helidon’s developer surface includes documentation, getting-started guide, engineering blog, and 6 more developer resources.

🌐 Visit website 📡 Source on GitHub
43.6/100 developing ▬ flat Agent 32/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemium
4 APIs 1 MCP Servers
Cloud NativeFrameworksJavaMicroProfileMicroservicesOracleReactive

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 43.6/100 · developing
Contract Quality 12.3 / 25
Developer Ergonomics 6.1 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 4.8 / 13
Governance 7.0 / 12
Discoverability 5.6 / 10
Agent readiness — 32/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
MCP Server 12 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 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/helidon: 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 4

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

Helidon Health API

The Health API from Helidon — 4 operation(s) for health.

Helidon Info API

The Info API from Helidon — 1 operation(s) for info.

Helidon Metrics API

The Metrics API from Helidon — 4 operation(s) for metrics.

Helidon OpenAPI API

The OpenAPI API from Helidon — 1 operation(s) for openapi.

Open Collections 1

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

Helidon Observe (Health & Metrics) API

OPEN COLLECTION

MCP Servers 1

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

MCP Server

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Helidon Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Helidon Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Helidon Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Helidon API Rules

5 rules · 3 warnings 2 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

Helidon Application Configuration

5 properties

JSON SCHEMA

Security Posture 1

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

Helidon Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Helidon Agentic Access

10 operations

10 operations · 0 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 MCPServer
MCPServer

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Company 3

The organization behind the API

Website
Website
 Blog
Blog
 BlogRSS
BlogRSS

Source (apis.yml)

apis.yml Raw ↑ 
aid: helidon
name: Helidon
description: Helidon is a collection of Java libraries from Oracle for writing microservices that run on a fast web core powered
  by Netty, supporting MicroProfile and reactive programming models.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/helidon.png
tags:
- Cloud Native
- Frameworks
- Java
- MicroProfile
- Microservices
- Oracle
- Reactive
url: https://raw.githubusercontent.com/api-evangelist/helidon/refs/heads/main/apis.yml
created: '2026-03-26'
modified: '2026-05-19'
specificationVersion: '0.19'
apis:
- aid: helidon:helidon-health-api
  name: Helidon Health API
  description: The Health API from Helidon — 4 operation(s) for health.
  humanURL: https://helidon.io/
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/helidon-health-api-openapi.yml
  - type: Documentation
    url: https://helidon.io/docs/latest
  - type: GettingStarted
    url: https://helidon.io/docs/latest/#/about/prerequisites
  - type: JSONSchema
    url: json-schema/helidon-application-config.json
- aid: helidon:helidon-info-api
  name: Helidon Info API
  description: The Info API from Helidon — 1 operation(s) for info.
  humanURL: https://helidon.io/
  tags:
  - Info
  properties:
  - type: OpenAPI
    url: openapi/helidon-info-api-openapi.yml
  - type: Documentation
    url: https://helidon.io/docs/latest
  - type: GettingStarted
    url: https://helidon.io/docs/latest/#/about/prerequisites
  - type: JSONSchema
    url: json-schema/helidon-application-config.json
- aid: helidon:helidon-metrics-api
  name: Helidon Metrics API
  description: The Metrics API from Helidon — 4 operation(s) for metrics.
  humanURL: https://helidon.io/
  tags:
  - Metrics
  properties:
  - type: OpenAPI
    url: openapi/helidon-metrics-api-openapi.yml
  - type: Documentation
    url: https://helidon.io/docs/latest
  - type: GettingStarted
    url: https://helidon.io/docs/latest/#/about/prerequisites
  - type: JSONSchema
    url: json-schema/helidon-application-config.json
- aid: helidon:helidon-openapi-api
  name: Helidon OpenAPI API
  description: The OpenAPI API from Helidon — 1 operation(s) for openapi.
  humanURL: https://helidon.io/
  tags:
  - OpenAPI
  properties:
  - type: OpenAPI
    url: openapi/helidon-openapi-api-openapi.yml
  - type: Documentation
    url: https://helidon.io/docs/latest
  - type: GettingStarted
    url: https://helidon.io/docs/latest/#/about/prerequisites
  - type: JSONSchema
    url: json-schema/helidon-application-config.json
common:
- type: AgenticAccess
  url: agentic-access/helidon-agentic-access.yml
- type: DomainSecurity
  url: security/helidon-domain-security.yml
- type: Website
  url: https://helidon.io/
- type: Documentation
  url: https://helidon.io/docs/latest
- type: GettingStarted
  url: https://helidon.io/docs/latest/#/about/prerequisites
- type: GitHubOrganization
  url: https://github.com/helidon-io
- type: Blog
  url: https://medium.com/helidon
- url: https://medium.com/feed/helidon
  type: BlogRSS
  description: Discovered RSS/Atom feed for https://medium.com/helidon
- name: MCP Server
  url: https://github.com/helidon-io/helidon-mcp
  type: MCPServer
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com