# Vert.x

**Canonical:** https://apis.io/providers/vert-x/  
**Website:** https://vertx.io/  
**APIs profiled:** 7

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.

## Kin Score — 31.4 / 100 (thin)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 31.4).

| Facet | Score |
|---|---|
| Discoverability | 64.8 |
| Contract Quality | 28.0 |
| Governance | 28.8 |
| Contract Governance | 28.8 |
| Operational Transparency | 10.5 |
| Developer Ergonomics | 28.6 |
| Commercial Clarity | 36.8 |
| Access Clarity | 36.8 |

## Agent readiness — 2.5 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Freemium — onboarding: unknown, pricing: freemium, trial: no (confidence: medium).

## APIs (7)

- **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...

## Security (2)

- **Vert X Domain Security** — TLSv1.3 · HSTS
- **Vert X Vulnerability Disclosure** — security.txt · contact published

## Plans (1)

- **Vert X Plans Pricing**

## Use cases (5)

- **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.

## Tags

Event-Driven, Frameworks, Java, JVM, Microservices, Polyglot, Reactive, Eclipse Foundation, Open-Source

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/vert-x/). Scores are computed from the provider's own public artifacts under a published rubric.