Ballerina

Ballerina is an open-source programming language for the cloud, created and maintained by WSO2, whose type system, syntax and tooling are built around network interaction: services, clients, data transformation and integration are language constructs rather than framework add-ons. It ships first-party generators for OpenAPI, AsyncAPI, GraphQL, gRPC, WSDL, EDI and FHIR, a package registry called Ballerina Central with a public read API, and a first-party MCP server and Agent Skills for coding agents.

Ballerina publishes 4 APIs on the APIs.io network, including Packages API, Connectors API, Triggers API, and 1 more. Tagged areas include Integration, Orchestrations, Open-Source, Programming Language, and Package Registry.

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

Ballerina’s developer surface includes engineering blog, documentation, getting-started guide, API reference, signup flow, support, CLI, and 34 more developer resources.

🌐 Visit website 📡 Source on GitHub

53.6/100 developing ▬ flat Agent 41/100 agent native saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemium

1 APIs 1 MCP Servers 27 Features 8 Use Cases

Integration Orchestrations Open-Source Programming Language Package Registry Developer Tools Code Generation Agent Skills

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 53.6/100 · developing

Contract Quality 16.3 / 25

Developer Ergonomics 14.3 / 20

Access Clarity 8.4 / 20

Operational Transparency 3.8 / 13

Contract Governance 4.0 / 12

Discoverability 6.9 / 10

Agent readiness — 41/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 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

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.

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/ballerina: 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 →

APIs 4

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

Ballerina Packages API

Public read API for the Ballerina Central package registry — list or search packages by keyword and organization, run a full-text search with suggestions and field highlighting,...

Ballerina Connectors API

Search the connector clients declared inside packages published to Ballerina Central — the outbound integration half of the registry, covering the 727 WSO2-maintained ballerinax...

Ballerina Triggers API

Search the event triggers and listeners declared inside packages published to Ballerina Central — the inbound, event-driven half of the registry, paired with the connector index...

Ballerina Docs API

Retrieve the complete generated API documentation model for one published package version — every module, client, function, record, type, constant, error, listener, annotation a...

Open Collections 5

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

API Collection

OPEN COLLECTION

Ballerina Connectors API

OPEN COLLECTION

Ballerina Docs API

OPEN COLLECTION

Ballerina Packages API

OPEN COLLECTION

Ballerina Triggers API

OPEN COLLECTION

MCP Servers 1

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

Ballerina MCP Server

WSO2 ships a first-party MCP server for Ballerina called `ballerina-library`. It runs over stdio as part of the `ballerina` Claude Code plugin (registered from the ballerina-ski...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Ballerina Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Ballerina Rate Limits

0 limits

RATE LIMITS

FinOps 1

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

Ballerina Finops

FINOPS

Features 27

Notable capabilities this provider offers.

Web Services

Working With Data

Restful API

gRPC API

GraphQL API

Kafka Consumer

Kafka Producer

Databases

LLMS

WSDL

Sequence Diagrams

Flowcharts

GraphQL CLI

Git-based workflow

VS Code Integration

Diagramming

Declarative data processing

Model optionality

Model choices as discriminate unions

Model data as data

Pattern matching

Data validation at the boundary

Data immutability

XML support

JSON support

Model data streams

Model tabular data

Scroll for all 27

Semantic Vocabularies 1

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

Ballerina Context

11 classes · 47 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Ballerina API Rules

5 rules · 3 warnings 2 info

SPECTRAL

Ballerina API Rules

19 rules · 8 errors 9 warnings 2 info

SPECTRAL

JSON Schema 11

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

ApiDocs

3 properties

JSON SCHEMA

BadRequestError

0 properties

JSON SCHEMA

Connector

8 properties

JSON SCHEMA

ConnectorSearchResponse

4 properties

JSON SCHEMA

Module

5 properties

JSON SCHEMA

NotFoundMessage

1 properties

JSON SCHEMA

PackageFullTextSearchResponse

0 properties

JSON SCHEMA

Package

28 properties

JSON SCHEMA

PackageSearchResponse

4 properties

JSON SCHEMA

Trigger

8 properties

JSON SCHEMA

TriggerSearchResponse

4 properties

JSON SCHEMA

Scroll for all 11

JSON Structure 11

JSON Structure definitions describing this provider's data shapes.

Central Api Api Docs Structure

3 properties

JSON STRUCTURE

Central Api Bad Request Error Structure

0 properties

JSON STRUCTURE

Central Api Connector Search Response Structure

4 properties

JSON STRUCTURE

Central Api Connector Structure

8 properties

JSON STRUCTURE

Central Api Module Structure

5 properties

JSON STRUCTURE

Central Api Not Found Message Structure

1 properties

JSON STRUCTURE

Central Api Package Full Text Search Response Structure

0 properties

JSON STRUCTURE

Central Api Package Search Response Structure

4 properties

JSON STRUCTURE

Central Api Package Structure

28 properties

JSON STRUCTURE

Central Api Trigger Search Response Structure

4 properties

JSON STRUCTURE

Central Api Trigger Structure

8 properties

JSON STRUCTURE

Scroll for all 11

Examples 9

Example request and response payloads for these APIs.

Central Api Connector Example

8 fields

EXAMPLE

Central Api Connector Search Response Example

4 fields

EXAMPLE

Central Api Module Example

5 fields

EXAMPLE

Central Api Package Docs Example

3 fields

EXAMPLE

Central Api Package Example

28 fields

EXAMPLE

Central Api Package Fulltext Search Response Example

6 fields

EXAMPLE

Central Api Package Search Response Example

4 fields

EXAMPLE

Central Api Trigger Example

8 fields

EXAMPLE

Central Api Trigger Search Response Example

4 fields

EXAMPLE

Scroll for all 9

Security Posture 3

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

Ballerina Authentication

2 schemes

SECURITY

Ballerina Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Ballerina Vulnerability Disclosure

Hackerone

SECURITY

Agentic Access 1

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

Ballerina Agentic Access

6 operations

6 operations · 0 acting

AGENTIC

Use Cases 8

What developers build with this provider.

Integration

Healthcare

Data-oriented programming

Event-Driven Architecture (EDA)

B2B integrations

ETL

Microservices

Backends for Frontends

Scroll for all 8

Resources

Get Started 3

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

DeveloperPortal

DeveloperPortal

SignUp

SignUp

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

JSONSchema

JSONSchema

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

MCPServer

AgentSkill

LLMsTxt

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

SpectralRules

Vocabulary

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Scroll for all 7

Build 6

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Libraries

Packages

CLI

ToolCrosswalk

Examples

Access & Security 4

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Security

Security

Authentication

Authentication

VulnerabilityDisclosure

VulnerabilityDisclosure

Learn 1

Tutorials, courses, talks, and written guidance

Learning

Learning

Operate 3

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Plans

Plans

Company 4

The organization behind the API

LinkedIn

Website

Website

Newsletter

Newsletter

Blog

Blog

Other 3

Properties that don't map to a standard resource type

CaseStudies

CaseStudies

Events

Events

Trademark

Trademark

Source (apis.yml)

aid: ballerina
url: https://raw.githubusercontent.com/api-evangelist/ballerina/refs/heads/main/apis.yml
apis:
- aid: ballerina:ballerina-packages-api
  name: Ballerina Packages API
  description: Public read API for the Ballerina Central package registry — list or search packages by keyword and organization,
    run a full-text search with suggestions and field highlighting, and list the published versions of a package newest-first.
    Anonymous; offset/limit pagination with a total count. Three operations, all probed live on 2026-09-04.
  humanURL: https://central.ballerina.io/
  baseURL: https://api.central.ballerina.io
  tags:
  - Packages
  properties:
  - type: OpenAPI
    url: openapi/ballerina-packages-api-openapi.yml
  - type: Overlay
    url: overlays/ballerina-packages-overlay.yaml
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/ballerina.png
  created: '2025-06-05'
  modified: '2026-09-04'
- aid: ballerina:ballerina-connectors-api
  name: Ballerina Connectors API
  description: Search the connector clients declared inside packages published to Ballerina Central — the outbound integration
    half of the registry, covering the 727 WSO2-maintained ballerinax connector packages. Each hit embeds the full package
    record it belongs to. Anonymous; one operation, probed live on 2026-09-04.
  humanURL: https://central.ballerina.io/
  baseURL: https://api.central.ballerina.io
  tags:
  - Connectors
  properties:
  - type: OpenAPI
    url: openapi/ballerina-connectors-api-openapi.yml
  - type: Overlay
    url: overlays/ballerina-connectors-overlay.yaml
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/ballerina.png
  created: '2025-06-05'
  modified: '2026-09-04'
- aid: ballerina:ballerina-triggers-api
  name: Ballerina Triggers API
  description: Search the event triggers and listeners declared inside packages published to Ballerina Central — the inbound,
    event-driven half of the registry, paired with the connector index. Each hit embeds the full package record it belongs
    to. Anonymous; one operation, probed live on 2026-09-04.
  humanURL: https://central.ballerina.io/
  baseURL: https://api.central.ballerina.io
  tags:
  - Triggers
  - Events
  tags_raw:
  - Triggers
  - Event-Driven
  properties:
  - type: OpenAPI
    url: openapi/ballerina-triggers-api-openapi.yml
  - type: Overlay
    url: overlays/ballerina-triggers-overlay.yaml
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/ballerina.png
  created: '2025-06-05'
  modified: '2026-09-04'
- aid: ballerina:ballerina-docs-api
  name: Ballerina Docs API
  description: Retrieve the complete generated API documentation model for one published package version — every module, client,
    function, record, type, constant, error, listener, annotation and enum, in both a nested per-module view and flat search
    indexes. This is the model that renders lib.ballerina.io, and the endpoint the first-party ballerina-library MCP server
    calls. Anonymous; probed live on 2026-09-04.
  humanURL: https://central.ballerina.io/
  baseURL: https://api.central.ballerina.io
  tags:
  - Documentation
  properties:
  - type: OpenAPI
    url: openapi/ballerina-docs-api-openapi.yml
  - type: Overlay
    url: overlays/ballerina-docs-overlay.yaml
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/ballerina.png
  created: '2025-06-05'
  modified: '2026-09-04'
name: Ballerina
tags:
- Integration
- Orchestrations
- Open-Source
- Programming Language
- Package Registry
- Developer Tools
- Code Generation
- Agent Skills
tags_raw:
- Integrations
- Orchestrations
- Open Source
- Programming Language
- Package Registry
- Developer Tools
- Code Generation
- Agent Skills
type: Index
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  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://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/ballerina.png
access: 3rd-Party
common:
- type: AgenticAccess
  url: agentic-access/ballerina-agentic-access.yml
- type: DomainSecurity
  url: security/ballerina-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/ballerina-platform
- type: LinkedIn
  url: https://www.linkedin.com/showcase/ballerinalang
- url: https://ballerina.io/
  name: The Ballerina programming language
  type: Website
- url: https://ballerina.io/case-studies/
  name: Ballerina case studies - The Ballerina programming language
  type: CaseStudies
- url: https://ballerina.io/learn/
  name: Learn - The Ballerina programming language
  type: Learning
- url: https://ballerina.io/community/events/
  name: Events - The Ballerina programming language
  type: Events
- url: https://ballerina.io/community/#subscribe-to-our-newsletter
  name: Community - The Ballerina programming language
  type: Newsletter
- url: https://ballerina.io/terms-of-service/
  name: Terms of service - The Ballerina programming language
  type: TermsOfService
- url: https://ballerina.io/privacy-policy/
  name: Privacy policy - The Ballerina programming language
  type: PrivacyPolicy
- url: https://ballerina.io/security-policy/
  name: Security policy - The Ballerina programming language
  type: Security
- url: https://ballerina.io/trademark-usage-policy/
  name: Ballerina trademark usage policy - The Ballerina programming language
  type: Trademark
- url: https://blog.ballerina.io/
  name: Blog - The Ballerina programming language
  type: Blog
- url: https://central.ballerina.io/ballerina-library
  name: Ballerina library - Ballerina Central
  type: Libraries
- name: Use Cases
  type: UseCases
  data:
  - name: Integration
  - name: Healthcare
  - name: Data-oriented programming
  - name: Event-Driven Architecture (EDA)
  - name: B2B integrations
  - name: ETL
  - name: Microservices
  - name: Backends for Frontends
- name: Features
  type: Features
  data:
  - name: Web Services
  - name: Working With Data
  - name: Restful API
  - name: gRPC API
  - name: GraphQL API
  - name: Kafka Consumer
  - name: Kafka Producer
  - name: Databases
  - name: LLMS
  - name: WSDL
  - name: Sequence Diagrams
  - name: Flowcharts
  - name: GraphQL CLI
  - name: Git-based workflow
  - name: VS Code Integration
  - name: Diagramming
  - name: Declarative data processing
  - name: Model optionality
  - name: Model choices as discriminate unions
  - name: Model data as data
  - name: Pattern matching
  - name: Data validation at the boundary
  - name: Data immutability
  - name: XML support
  - name: JSON support
  - name: Model data streams
  - name: Model tabular data
- type: SpectralRules
  url: rules/ballerina-spectral-rules.yml
- type: Vocabulary
  url: vocabulary/ballerina-vocabulary.yaml
- type: Documentation
  url: https://ballerina.io/learn/
  name: Learn - The Ballerina programming language
- type: GettingStarted
  url: https://ballerina.io/learn/get-started/
  name: Get started with Ballerina
- type: APIReference
  url: https://lib.ballerina.io/
  name: Ballerina library API documentation
- type: DeveloperPortal
  url: https://central.ballerina.io/
  name: Ballerina Central
- type: SignUp
  url: https://central.ballerina.io/
  name: Sign in to Ballerina Central to obtain a publishing token
- type: Support
  url: https://discord.gg/ballerinalang
  name: Ballerina community Discord
- type: Packages
  url: packages/ballerina-packages.yml
- type: CLI
  url: cli/ballerina-cli.yml
- type: MCPServer
  url: mcp/ballerina-mcp.yml
- type: ToolCrosswalk
  url: mcp/ballerina-tool-crosswalk.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/ballerina-llms.txt
- type: Authentication
  url: authentication/ballerina-authentication.yml
- type: Conventions
  url: conventions/ballerina-conventions.yml
- type: ErrorCatalog
  url: errors/ballerina-problem-types.yml
- type: Lifecycle
  url: lifecycle/ballerina-lifecycle.yml
- type: ChangeLog
  url: changelog/ballerina-changelog.yml
- type: Conformance
  url: conformance/ballerina-conformance.yml
- type: DataModel
  url: data-model/ballerina-data-model.yml
- type: VulnerabilityDisclosure
  url: security/ballerina-vulnerability-disclosure.yml
- type: Plans
  url: plans/ballerina-plans-pricing.yml
- type: RateLimits
  url: rate-limits/ballerina-rate-limits.yml
- type: Examples
  url: examples/_index.yml
- type: JSONSchema
  url: json-schema/central-api-package-schema.json
created: '2025-06-05'
modified: '2026-09-04'
position: Producing
description: 'Ballerina is an open-source programming language for the cloud, created and maintained by WSO2, whose type system,
  syntax and tooling are built around network interaction: services, clients, data transformation and integration are language
  constructs rather than framework add-ons. It ships first-party generators for OpenAPI, AsyncAPI, GraphQL, gRPC, WSDL, EDI
  and FHIR, a package registry called Ballerina Central with a public read API, and a first-party MCP server and Agent Skills
  for coding agents.'
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
specificationVersion: '0.23'
x-enrichment:
  date: '2026-09-04'
  status: enriched
  artifacts_added: 47
  pass: local-v3

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