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 API contracts indexed on the APIs.io network, including Health API, Info API, Metrics API, and 1 more. Tagged areas include Cloud-Native, Framework, 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 9 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

22.9/100 emerging ▬ flat Agent 23/100 agent aware Front door AI 2/6 trace Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 published contract 1 MCP Servers

Cloud-Native Framework JavaMicroProfileMicroservices Oracle Reactive

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 22.9/100 · emerging

Contract Quality 9.0 / 21

Developer Ergonomics 4.0 / 17

Access Clarity 1.3 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.0 / 10

Discoverability 4.1 / 9

Regulatory Posture 0.9 / 15

Agent readiness — 23/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 9 / 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 4 / 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

MCP Tool Quality 6 / 6

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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

6 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 7.9 — up to +18.4 composite points
Developer Ergonomics scores 23.8 — up to +15.2 composite points
Contract Quality scores 42.2 — up to +14.5 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/helidon/apis.yml: open an issue on github.com/api-evangelist/helidon to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

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 Open API

The Open API API from Helidon — 1 operation(s) for open api.

Open Collections 5

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

Helidon Observe ( & Metrics) Health API

OPEN COLLECTION

Helidon Observe ( & Metrics) Health Info API

OPEN COLLECTION

Helidon Observe ( & ) Health Metrics API

OPEN COLLECTION

Helidon Observe (Health & Metrics) API

OPEN COLLECTION

Helidon Observe ( & Metrics) Health OpenAPI API

OPEN COLLECTION

MCP Servers 1

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

MCP Server

MCP SERVER

Helidon API pricing

Not yet checked against Helidon's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Helidon's documentation. All 5 limits →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Helidon

SLA

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 — jsonschema 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

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

Blog

Blog

BlogRSS

BlogRSS

Source (apis.yml)

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
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/helidon.png
tags:
- Cloud-Native
- Framework
- Java
- MicroProfile
- Microservices
- Oracle
- Reactive
tags_raw:
- 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: '0.23'
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-open-api-api
  name: Helidon Open API
  description: The Open API API from Helidon — 1 operation(s) for open api.
  humanURL: https://helidon.io/
  tags:
  - OpenAPI
  tags_raw:
  - Open API
  properties:
  - type: OpenAPI
    url: openapi/helidon-open-api-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: Plans
  url: plans/helidon-plans-pricing.yml
- type: RateLimits
  url: rate-limits/helidon-rate-limits.yml
- type: FinOps
  url: finops/helidon-finops.yml
- 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

Helidon API — frequently asked questions

Does Helidon have an API?

Yes. APIs.io lists 4 APIs from Helidon, including Helidon Health API, Helidon Info API and Helidon Metrics API, and 1 more.

Is there an OpenAPI specification for the Helidon API?

Yes. APIs.io indexes 4 OpenAPI specifications for Helidon, each linked for download from this page.

How much does the Helidon API cost?

APIs.io lists 3 pricing plans for Helidon, with each plan's price, limits and inclusions under Pricing on this page.

Does Helidon have an MCP server?

Yes. APIs.io lists 1 MCP server for Helidon.

Is the Helidon API ready for AI agents?

Helidon has a Kin Score of 22.9 out of 100 (emerging) and an Agent Readiness score of 23.3 (agent-aware), scored by API Evangelist on 2026-11-06.

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get_provider_artifactsEvery artifact this provider publishes, grouped by type.
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.
find_cohortsEvery scored population of providers in the catalog.

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