Vert.x

Eclipse Vert.x is a toolkit for building reactive applications on the JVM, providing support for multiple languages including Java, JavaScript, Groovy, Ruby, and Kotlin with an event-driven, non-blocking architecture. Part of the Eclipse Foundation under the Eclipse Public License 2.0. Vert.x follows a polyglot, unopinionated model allowing developers to build microservices, web applications, IoT backends, and event-driven systems with high concurrency using a small memory footprint.

Vert.x is listed with 7 APIs on the APIs.io network. Tagged areas include Event-Driven, Framework, Java, JVM, and Microservices.

The Vert.x catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Vert.x’s developer surface includes documentation, getting-started guide, engineering blog, changelog, Stack Overflow tag, and 17 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

31.9/100 thin ▬ flat Agent 1/100 human only Front door AI 1/6 silent Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

AccessFreemium

7 APIs 10 Features 5 Use Cases

Event-Driven Framework Java JVM MicroservicesPolyglotReactive Eclipse Foundation Open Source

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 31.9/100 · thin

Contract Quality 5.7 / 21

Developer Ergonomics 4.9 / 17

Access Clarity 4.9 / 17

Operational Transparency 2.3 / 11

Contract Governance 2.8 / 10

Discoverability 5.3 / 9

Regulatory Posture 3.7 / 15

Agent readiness — 1/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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

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

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/.

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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/vert-x: 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
OpenSSF Best Practices Badge Holders	undeclared	-	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 7

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

Vert.x Core

The core toolkit for building reactive, event-driven applications on the JVM. Provides the event loop, verticle deployment, event bus, HTTP server and client, TCP/UDP networking...

Vert.x Web

A set of building blocks for building web applications and RESTful HTTP microservices with Vert.x. Provides routing, request handling, session management, template engine suppor...

Vert.x OpenAPI

Vert.x OpenAPI provides OpenAPI 3.1 specification support for Vert.x, enabling contract-driven API development with automatic request/response validation, routing, and API speci...

Vert.x gRPC

A Vert.x-native gRPC implementation providing a reactive, non-blocking gRPC client and server built on top of Vert.x HTTP/2. Supports protobuf service definitions with Vert.x Fu...

Vert.x SQL Client

A high-performance reactive SQL client for Vert.x supporting PostgreSQL, MySQL, Microsoft SQL Server, IBM DB2, and Oracle databases. Provides a non-blocking, fully reactive API ...

Vert.x Auth

Authentication and authorization support for Vert.x applications. Provides JWT, OAuth2, JDBC, MongoDB, and WebAuthn/FIDO2 authentication providers with a unified async security ...

Vert.x Health Check

A Vert.x component for implementing health check endpoints for Kubernetes liveness and readiness probes. Provides a composable health procedure mechanism that aggregates multipl...

Scroll for all 7

Pricing Plans 1

Published pricing tiers and plan structures.

Vert X Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Vert X Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Vert X Finops

FINOPS

Features 10

Notable capabilities this provider offers.

Event-Driven Architecture

Non-blocking event loop model with verticles for concurrent request handling without traditional threading overhead.

Polyglot Support

Write Vert.x applications in Java, JavaScript, Groovy, Kotlin, Scala, and Ruby on the same JVM platform.

Event Bus

Distributed message-passing backbone enabling communication between verticles across nodes in a cluster.

Reactive HTTP Client and Server

High-performance HTTP/1.1 and HTTP/2 server and client with WebSocket, SSE, and gRPC support.

OpenAPI Contract Validation

Automatic request and response validation against OpenAPI 3.1 specifications using vertx-openapi.

Reactive SQL Clients

Non-blocking, fully reactive SQL clients for PostgreSQL, MySQL, MSSQL, DB2, and Oracle.

Authentication and Authorization

Pluggable security providers for JWT, OAuth2, JDBC, MongoDB, LDAP, and WebAuthn/FIDO2.

Health Checks

Composable health check procedures for Kubernetes liveness and readiness probe endpoints.

Clustering

Built-in cluster support via Hazelcast, Infinispan, Zookeeper, or Apache Ignite for distributed deployments.

Virtual Threads

Java 21 virtual thread support enabling synchronous-style code in Vert.x worker verticles.

Scroll for all 10

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Vert X Context

7 classes · 44 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Vert.x — jsonschema rules

5 rules · 3 warnings 2 info

SPECTRAL

Vert.x API Rules

26 rules · 7 errors 15 warnings

SPECTRAL

JSON Schema 3

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

Vert.x Application Configuration

13 properties

JSON SCHEMA

Vert.x Verticle Deployment Descriptor

2 properties

JSON SCHEMA

Vert.x Health Check Response

3 properties

JSON SCHEMA

JSON Structure 3

JSON Structure definitions describing this provider's data shapes.

Vertx Config Structure

13 properties

JSON STRUCTURE

Vertx Deployment Descriptor Structure

2 properties

JSON STRUCTURE

Vertx Health Check Structure

3 properties

JSON STRUCTURE

Examples 3

Example request and response payloads for these APIs.

Vertx Config Example

13 fields

EXAMPLE

Vertx Deployment Descriptor Example

2 fields

EXAMPLE

Vertx Health Check Example

3 fields

EXAMPLE

Security Posture 2

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

Vert X Domain Security

TLSv1.3 · HSTS

SECURITY

Vert X Vulnerability Disclosure

security.txt · contact published

SECURITY

Use Cases 5

What developers build with this provider.

Microservices Backend

Build lightweight, high-concurrency microservices with Vert.x Web routing, service proxy patterns, and event bus communication.

API Gateway

Implement reactive API gateways using vertx-http-proxy with routing, authentication, and rate limiting.

Real-Time Applications

Build WebSocket and SSE-based real-time applications for live dashboards, chat, and notification systems.

IoT Data Ingestion

Handle high-volume MQTT and TCP data streams from IoT devices using Vert.x non-blocking networking.

Contract-First REST APIs

Develop OpenAPI 3.1 contract-first REST APIs with automatic validation using vertx-openapi and vertx-web.

Integrations 6

Pre-built integrations with other platforms and tools.

Quarkus

Vert.x is the reactive engine underlying Quarkus, providing the event loop and HTTP server for Quarkus applications.

Kubernetes

Deploy Vert.x verticles on Kubernetes with health check endpoints, clustering, and horizontal pod autoscaling.

Apache Kafka

Vert.x Kafka Client provides reactive, non-blocking Kafka producer and consumer integration.

Redis

Vert.x Redis Client enables async Redis operations for caching, pub/sub, and session storage.

Hazelcast

Hazelcast cluster manager for distributed Vert.x deployments with shared data and event bus clustering.

Micrometer

Vert.x Micrometer Metrics provides application metrics integration with Prometheus and Grafana.

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Vocabulary

Vocabulary

SpectralRules

SpectralRules

JSONLDContext

JSONLDContext

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 5

Status, limits, changes, and where to get help

RateLimits

IssueTracker

ChangeLog

Forums

StackOverflow

Commercial 5

Pricing, plans, and the legal terms of use

Plans

FinOps

PrivacyPolicy

TermsOfService

License

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

MavenCentral

MavenCentral

Source (apis.yml)

aid: vert-x
name: Vert.x
description: Eclipse Vert.x is a toolkit for building reactive applications on the JVM, providing support for multiple languages
  including Java, JavaScript, Groovy, Ruby, and Kotlin with an event-driven, non-blocking architecture. Part of the Eclipse
  Foundation under the Eclipse Public License 2.0. Vert.x follows a polyglot, unopinionated model allowing developers to build
  microservices, web applications, IoT backends, and event-driven systems with high concurrency using a small memory footprint.
type: Index
deliveryModel:
  model: unknown
  license_evidence:
    repo: eclipse-vertx/vert.x
    spdx: NOASSERTION
    stars: 14690
  open_source: unknown
  commercial: true
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - pricing
  - repository-unlicensed
  generated: '2026-09-25'
  method: derived
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://vertx.io/images/logo-wide.png
tags:
- Event-Driven
- Framework
- Java
- JVM
- Microservices
- Polyglot
- Reactive
- Eclipse Foundation
- Open Source
tags_raw:
- Event-Driven
- Frameworks
- Java
- JVM
- Microservices
- Polyglot
- Reactive
- Eclipse Foundation
- Open Source
- Open-Source
url: https://raw.githubusercontent.com/api-evangelist/vert-x/refs/heads/main/apis.yml
created: '2026-03-26'
modified: '2026-05-03'
specificationVersion: '0.23'
apis:
- aid: vert-x:vert-x-core
  name: Vert.x Core
  description: The core toolkit for building reactive, event-driven applications on the JVM. Provides the event loop, verticle
    deployment, event bus, HTTP server and client, TCP/UDP networking, and the fundamental async programming model used by
    all Vert.x components.
  humanURL: https://vertx.io/docs/vertx-core/java/
  tags:
  - Event-Driven
  - Event Loop
  - Verticles
  - Event Bus
  - Reactive
  - JVM
  properties:
  - type: Documentation
    url: https://vertx.io/docs/vertx-core/java/
  - type: GettingStarted
    url: https://vertx.io/get-started/
  - type: GitHubRepository
    url: https://github.com/eclipse-vertx/vert.x
  - type: MavenPackage
    url: https://central.sonatype.com/artifact/io.vertx/vertx-core
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/vert-x/refs/heads/main/json-schema/vertx-config.json
  - type: JSONStructure
    url: https://raw.githubusercontent.com/api-evangelist/vert-x/refs/heads/main/json-structure/vertx-config-structure.json
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/vert-x/refs/heads/main/json-schema/vertx-deployment-descriptor.json
  - type: JSONStructure
    url: https://raw.githubusercontent.com/api-evangelist/vert-x/refs/heads/main/json-structure/vertx-deployment-descriptor-structure.json
- aid: vert-x:vertx-web
  name: Vert.x Web
  description: A set of building blocks for building web applications and RESTful HTTP microservices with Vert.x. Provides
    routing, request handling, session management, template engine support, and WebSocket handling on top of Vert.x Core HTTP
    server.
  humanURL: https://vertx.io/docs/vertx-web/java/
  tags:
  - REST
  - HTTP
  - Web Framework
  - Routing
  - WebSocket
  properties:
  - type: Documentation
    url: https://vertx.io/docs/vertx-web/java/
  - type: GitHubRepository
    url: https://github.com/eclipse-vertx/vert.x
  - type: MavenPackage
    url: https://central.sonatype.com/artifact/io.vertx/vertx-web
- aid: vert-x:vertx-openapi
  name: Vert.x OpenAPI
  description: Vert.x OpenAPI provides OpenAPI 3.1 specification support for Vert.x, enabling contract-driven API development
    with automatic request/response validation, routing, and API specification serving for Vert.x Web applications.
  humanURL: https://vertx.io/docs/vertx-openapi/java/
  tags:
  - OpenAPI
  - API Specification
  - Validation
  - Contract-Driven
  properties:
  - type: Documentation
    url: https://vertx.io/docs/vertx-openapi/java/
  - type: GitHubRepository
    url: https://github.com/eclipse-vertx/vertx-openapi
  - type: MavenPackage
    url: https://central.sonatype.com/artifact/io.vertx/vertx-openapi
- aid: vert-x:vertx-grpc
  name: Vert.x gRPC
  description: A Vert.x-native gRPC implementation providing a reactive, non-blocking gRPC client and server built on top
    of Vert.x HTTP/2. Supports protobuf service definitions with Vert.x Future and stream-based APIs.
  humanURL: https://vertx.io/docs/vertx-grpc/java/
  tags:
  - gRPC
  - Protocol Buffers
  - HTTP/2
  - Streaming
  properties:
  - type: Documentation
    url: https://vertx.io/docs/vertx-grpc/java/
  - type: GitHubRepository
    url: https://github.com/eclipse-vertx/vertx-grpc
  - type: MavenPackage
    url: https://central.sonatype.com/artifact/io.vertx/vertx-grpc
- aid: vert-x:vertx-sql-client
  name: Vert.x SQL Client
  description: A high-performance reactive SQL client for Vert.x supporting PostgreSQL, MySQL, Microsoft SQL Server, IBM DB2,
    and Oracle databases. Provides a non-blocking, fully reactive API for executing queries, transactions, and batch operations.
  humanURL: https://vertx.io/docs/vertx-pg-client/java/
  tags:
  - SQL
  - Database
  - PostgreSQL
  - MySQL
  - Reactive
  properties:
  - type: Documentation
    url: https://vertx.io/docs/vertx-pg-client/java/
  - type: GitHubRepository
    url: https://github.com/eclipse-vertx/vertx-sql-client
  - type: MavenPackage
    url: https://central.sonatype.com/artifact/io.vertx/vertx-pg-client
- aid: vert-x:vertx-auth
  name: Vert.x Auth
  description: Authentication and authorization support for Vert.x applications. Provides JWT, OAuth2, JDBC, MongoDB, and
    WebAuthn/FIDO2 authentication providers with a unified async security API that integrates with Vert.x Web routing.
  humanURL: https://vertx.io/docs/vertx-auth-common/java/
  tags:
  - Authentication
  - Authorization
  - JWT
  - Security
  tags_raw:
  - Authentication
  - Authorization
  - JWT
  - OAuth2
  - Security
  properties:
  - type: Documentation
    url: https://vertx.io/docs/vertx-auth-common/java/
  - type: GitHubRepository
    url: https://github.com/eclipse-vertx/vertx-auth
  - type: MavenPackage
    url: https://central.sonatype.com/artifact/io.vertx/vertx-auth-common
- aid: vert-x:vertx-health-check
  name: Vert.x Health Check
  description: A Vert.x component for implementing health check endpoints for Kubernetes liveness and readiness probes. Provides
    a composable health procedure mechanism that aggregates multiple health checks into a single HTTP endpoint response.
  humanURL: https://vertx.io/docs/vertx-health-check/java/
  tags:
  - Health Check
  - Kubernetes
  - Observability
  - Liveness
  - Readiness
  properties:
  - type: Documentation
    url: https://vertx.io/docs/vertx-health-check/java/
  - type: GitHubRepository
    url: https://github.com/eclipse-vertx/vertx-health-check
  - type: MavenPackage
    url: https://central.sonatype.com/artifact/io.vertx/vertx-health-check
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/vert-x/refs/heads/main/json-schema/vertx-health-check-schema.json
  - type: JSONStructure
    url: https://raw.githubusercontent.com/api-evangelist/vert-x/refs/heads/main/json-structure/vertx-health-check-structure.json
common:
- type: Plans
  url: plans/vert-x-plans-pricing.yml
- type: RateLimits
  url: rate-limits/vert-x-rate-limits.yml
- type: FinOps
  url: finops/vert-x-finops.yml
- type: IssueTracker
  url: https://github.com/eclipse-vertx/vert.x/issues
- type: ContributionGuide
  url: https://github.com/eclipse-vertx/vert.x/blob/master/CONTRIBUTING.md
- type: VulnerabilityDisclosure
  url: security/vert-x-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/vert-x-domain-security.yml
- type: Website
  url: https://vertx.io/
- type: Documentation
  url: https://vertx.io/docs/
- type: GettingStarted
  url: https://vertx.io/get-started/
- type: GitHubOrganization
  url: https://github.com/eclipse-vertx
- type: Blog
  url: https://vertx.io/blog/
- type: PrivacyPolicy
  url: https://www.eclipse.org/legal/privacy.php
- type: TermsOfService
  url: https://www.eclipse.org/legal/termsofuse.php
- type: License
  url: https://www.eclipse.org/legal/epl-2.0/
- type: ChangeLog
  url: https://github.com/eclipse-vertx/vert.x/blob/master/CHANGELOG.adoc
- type: MavenCentral
  url: https://central.sonatype.com/search?q=io.vertx
- type: Forums
  url: https://groups.google.com/forum/#!forum/vertx
- type: StackOverflow
  url: https://stackoverflow.com/questions/tagged/vert.x
- type: Vocabulary
  url: https://raw.githubusercontent.com/api-evangelist/vert-x/refs/heads/main/vocabulary/vert-x-vocabulary.yaml
- type: SpectralRules
  url: https://raw.githubusercontent.com/api-evangelist/vert-x/refs/heads/main/rules/vert-x-spectral-rules.yml
- type: JSONLDContext
  url: https://raw.githubusercontent.com/api-evangelist/vert-x/refs/heads/main/json-ld/vert-x-context.jsonld
- type: Features
  data:
  - name: Event-Driven Architecture
    description: Non-blocking event loop model with verticles for concurrent request handling without traditional threading
      overhead.
  - name: Polyglot Support
    description: Write Vert.x applications in Java, JavaScript, Groovy, Kotlin, Scala, and Ruby on the same JVM platform.
  - name: Event Bus
    description: Distributed message-passing backbone enabling communication between verticles across nodes in a cluster.
  - name: Reactive HTTP Client and Server
    description: High-performance HTTP/1.1 and HTTP/2 server and client with WebSocket, SSE, and gRPC support.
  - name: OpenAPI Contract Validation
    description: Automatic request and response validation against OpenAPI 3.1 specifications using vertx-openapi.
  - name: Reactive SQL Clients
    description: Non-blocking, fully reactive SQL clients for PostgreSQL, MySQL, MSSQL, DB2, and Oracle.
  - name: Authentication and Authorization
    description: Pluggable security providers for JWT, OAuth2, JDBC, MongoDB, LDAP, and WebAuthn/FIDO2.
  - name: Health Checks
    description: Composable health check procedures for Kubernetes liveness and readiness probe endpoints.
  - name: Clustering
    description: Built-in cluster support via Hazelcast, Infinispan, Zookeeper, or Apache Ignite for distributed deployments.
  - name: Virtual Threads
    description: Java 21 virtual thread support enabling synchronous-style code in Vert.x worker verticles.
- type: UseCases
  data:
  - name: Microservices Backend
    description: Build lightweight, high-concurrency microservices with Vert.x Web routing, service proxy patterns, and event
      bus communication.
  - name: API Gateway
    description: Implement reactive API gateways using vertx-http-proxy with routing, authentication, and rate limiting.
  - name: Real-Time Applications
    description: Build WebSocket and SSE-based real-time applications for live dashboards, chat, and notification systems.
  - name: IoT Data Ingestion
    description: Handle high-volume MQTT and TCP data streams from IoT devices using Vert.x non-blocking networking.
  - name: Contract-First REST APIs
    description: Develop OpenAPI 3.1 contract-first REST APIs with automatic validation using vertx-openapi and vertx-web.
- type: Integrations
  data:
  - name: Quarkus
    description: Vert.x is the reactive engine underlying Quarkus, providing the event loop and HTTP server for Quarkus applications.
  - name: Kubernetes
    description: Deploy Vert.x verticles on Kubernetes with health check endpoints, clustering, and horizontal pod autoscaling.
  - name: Apache Kafka
    description: Vert.x Kafka Client provides reactive, non-blocking Kafka producer and consumer integration.
  - name: Redis
    description: Vert.x Redis Client enables async Redis operations for caching, pub/sub, and session storage.
  - name: Hazelcast
    description: Hazelcast cluster manager for distributed Vert.x deployments with shared data and event bus clustering.
  - name: Micrometer
    description: Vert.x Micrometer Metrics provides application metrics integration with Prometheus and Grafana.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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