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.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Vert.x the way a machine reads it — 45 machine-readable artifacts across 7 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Vert.x scores 52.3/100 (developing), with a separate agent-readiness read of 7/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Vert.x
Each block below is one kind of artifact we hold for Vert.x. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 7
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
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 within the panel for all 7 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Vert X Plans Pricing
PLANSRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Vert X Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Vert X Finops
FINOPSFeatures 10
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
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 within the panel for all 10 ·
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Vert X Context
JSON-LDSpectral Rules 2
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Vert.x API Rules
SPECTRALVert.x API Rules
SPECTRALJSON Schema 3
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
Vert.x Application Configuration
JSON SCHEMAVert.x Verticle Deployment Descriptor
JSON SCHEMAVert.x Health Check Response
JSON SCHEMAJSON Structure 3
JSON Structure captures the data shapes in a form built for tooling — a complement to JSON Schema that keeps the model machine-legible.
JSON Structure definitions describing this provider's data shapes.
Vertx Config Structure
JSON STRUCTUREVertx Deployment Descriptor Structure
JSON STRUCTUREVertx Health Check Structure
JSON STRUCTUREExamples 3
Real request and response payloads are what turn a spec from abstract into obvious — and they're one of the twelve things an agent needs to call an API correctly on the first try.
Example request and response payloads for these APIs.
Vertx Config Example
EXAMPLEVertx Health Check Example
EXAMPLESecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Use Cases 5
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
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 tell you where this provider already fits in a stack.
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
Every other property we hold for Vert.x — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 1
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Design & Contract 3
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type
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