Apache Pulsar

Apache Pulsar is a cloud-native, distributed messaging and streaming platform that provides server-to-server messaging with multi-tenancy, high performance, and geo-replication. It combines messaging and stream processing in a single platform.

Apache Pulsar publishes 8 APIs on the APIs.io network, including Messaging API, Brokers API, Clusters API, and 5 more. Tagged areas include Cloud Native, Messaging, Multi-Tenant, Pub-Sub, and Streaming.

The Apache Pulsar catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 3 Spectral governance rulesets.

Apache Pulsar’s developer surface includes documentation, engineering blog, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

41.4/100 thin ▼ -8.0 Agent 27/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFreemium

8 APIs 7 Features 4 Use Cases

Cloud NativeMessagingMulti-TenantPub-SubStreamingApacheOpen Source

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 41.4/100 · thin

Contract Quality 15.7 / 25

Developer Ergonomics 2.2 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 4.8 / 13

Governance 7.5 / 12

Discoverability 6.5 / 10

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

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 6 / 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

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/apache-pulsar: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 8

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

Rate Limits 1

Documented rate limits and quota policies.

Apache Pulsar Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Apache Pulsar Finops

FINOPS

Features 7

Notable capabilities this provider offers.

Multi-Tenancy

Native multi-tenancy with tenant and namespace isolation

Persistent Messaging

Durable message storage with Apache BookKeeper

Geo-Replication

Built-in geo-replication across data centers and clouds

Pulsar Functions

Lightweight serverless compute natively integrated with messaging

Tiered Storage

Offload old data to object storage (S3, GCS) for cost efficiency

Schema Registry

Built-in schema registry for producers and consumers

Multiple Subscription Types

Exclusive, Shared, Failover, and Key_Shared subscription modes

Scroll for all 7

JSON Schema 8

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

Scroll for all 8

Scroll for all 7

Examples 7

Example request and response payloads for these APIs.

Scroll for all 7

Use Cases 4

What developers build with this provider.

Real-Time Event Streaming

Stream events between microservices with guaranteed delivery

Message Queue

Use Shared subscription as a traditional message queue

Event Sourcing

Store and replay event streams for event-driven architectures

IoT Data Ingestion

Ingest high-volume IoT telemetry into Pulsar topics

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

SpectralRules

SpectralRules

Vocabulary

Vocabulary

JSONLD

JSONLD

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

Company 1

The organization behind the API

Blog

Blog

Source (apis.yml)

aid: apache-pulsar
name: Apache Pulsar
description: Apache Pulsar is a cloud-native, distributed messaging and streaming platform that provides server-to-server
  messaging with multi-tenancy, high performance, and geo-replication. It combines messaging and stream processing in a single
  platform.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
position: Consumer
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/apache-pulsar.png
tags:
- Cloud Native
- Messaging
- Multi-Tenant
- Pub-Sub
- Streaming
- Apache
- Open Source
created: '2026-03-16'
modified: '2026-05-19'
url: https://raw.githubusercontent.com/api-evangelist/apache-pulsar/refs/heads/main/apis.yml
specificationVersion: '0.19'
apis:
- aid: apache-pulsar:apache-pulsar-messaging-api
  name: Apache Pulsar Messaging API
  description: Pulsar messaging protocol for producing and consuming messages on topics, with support for multiple subscription
    types (Exclusive, Shared, Failover, Key_Shared), schema enforcement, and both persistent and non-persistent topics.
  humanURL: https://pulsar.apache.org/docs/next/client-libraries/
  tags:
  - Messaging
  - Pub-Sub
  - Streaming
  properties:
  - type: Documentation
    url: https://pulsar.apache.org/docs/next/client-libraries/
  - type: AsyncAPI
    url: asyncapi/pulsar-messaging.yml
  - type: JSONSchema
    url: json-schema/pulsar-message.json
- aid: apache-pulsar:apache-pulsar-brokers-api
  name: Apache Pulsar Brokers API
  description: The Brokers API from Apache Pulsar — 2 operation(s) for brokers.
  humanURL: https://pulsar.apache.org/admin-rest-api/
  baseURL: http://localhost:8080/admin/v2
  tags:
  - Brokers
  properties:
  - type: OpenAPI
    url: openapi/apache-pulsar-brokers-api-openapi.yml
  - type: Documentation
    url: https://pulsar.apache.org/admin-rest-api/
- aid: apache-pulsar:apache-pulsar-clusters-api
  name: Apache Pulsar Clusters API
  description: The Clusters API from Apache Pulsar — 2 operation(s) for clusters.
  humanURL: https://pulsar.apache.org/admin-rest-api/
  baseURL: http://localhost:8080/admin/v2
  tags:
  - Clusters
  properties:
  - type: OpenAPI
    url: openapi/apache-pulsar-clusters-api-openapi.yml
  - type: Documentation
    url: https://pulsar.apache.org/admin-rest-api/
- aid: apache-pulsar:apache-pulsar-functions-api
  name: Apache Pulsar Functions API
  description: The Functions API from Apache Pulsar — 3 operation(s) for functions.
  humanURL: https://pulsar.apache.org/admin-rest-api/
  baseURL: http://localhost:8080/admin/v2
  tags:
  - Functions
  properties:
  - type: OpenAPI
    url: openapi/apache-pulsar-functions-api-openapi.yml
  - type: Documentation
    url: https://pulsar.apache.org/admin-rest-api/
- aid: apache-pulsar:apache-pulsar-namespaces-api
  name: Apache Pulsar Namespaces API
  description: The Namespaces API from Apache Pulsar — 3 operation(s) for namespaces.
  humanURL: https://pulsar.apache.org/admin-rest-api/
  baseURL: http://localhost:8080/admin/v2
  tags:
  - Namespaces
  properties:
  - type: OpenAPI
    url: openapi/apache-pulsar-namespaces-api-openapi.yml
  - type: Documentation
    url: https://pulsar.apache.org/admin-rest-api/
- aid: apache-pulsar:apache-pulsar-subscriptions-api
  name: Apache Pulsar Subscriptions API
  description: The Subscriptions API from Apache Pulsar — 2 operation(s) for subscriptions.
  humanURL: https://pulsar.apache.org/admin-rest-api/
  baseURL: http://localhost:8080/admin/v2
  tags:
  - Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/apache-pulsar-subscriptions-api-openapi.yml
  - type: Documentation
    url: https://pulsar.apache.org/admin-rest-api/
- aid: apache-pulsar:apache-pulsar-tenants-api
  name: Apache Pulsar Tenants API
  description: The Tenants API from Apache Pulsar — 2 operation(s) for tenants.
  humanURL: https://pulsar.apache.org/admin-rest-api/
  baseURL: http://localhost:8080/admin/v2
  tags:
  - Tenants
  properties:
  - type: OpenAPI
    url: openapi/apache-pulsar-tenants-api-openapi.yml
  - type: Documentation
    url: https://pulsar.apache.org/admin-rest-api/
- aid: apache-pulsar:apache-pulsar-topics-api
  name: Apache Pulsar Topics API
  description: The Topics API from Apache Pulsar — 4 operation(s) for topics.
  humanURL: https://pulsar.apache.org/admin-rest-api/
  baseURL: http://localhost:8080/admin/v2
  tags:
  - Topics
  properties:
  - type: OpenAPI
    url: openapi/apache-pulsar-topics-api-openapi.yml
  - type: Documentation
    url: https://pulsar.apache.org/admin-rest-api/
integrations:
- name: Apache Pulsar
- name: Slack
- name: GitHub
- name: Pulsar
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com
common:
- type: AgenticAccess
  url: agentic-access/apache-pulsar-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/apache-pulsar-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/apache-pulsar-domain-security.yml
- type: GitHubOrganization
  url: https://github.com/apache/pulsar
- type: Documentation
  url: https://pulsar.apache.org/
- type: SpectralRules
  url: rules/apache-pulsar-spectral-rules.yml
- type: Vocabulary
  url: vocabulary/apache-pulsar-vocabulary.yaml
- type: JSONLD
  url: json-ld/apache-pulsar-context.jsonld
- type: Blog
  url: https://pulsar.apache.org/blog/rss.xml
- type: Features
  data:
  - name: Multi-Tenancy
    description: Native multi-tenancy with tenant and namespace isolation
  - name: Persistent Messaging
    description: Durable message storage with Apache BookKeeper
  - name: Geo-Replication
    description: Built-in geo-replication across data centers and clouds
  - name: Pulsar Functions
    description: Lightweight serverless compute natively integrated with messaging
  - name: Tiered Storage
    description: Offload old data to object storage (S3, GCS) for cost efficiency
  - name: Schema Registry
    description: Built-in schema registry for producers and consumers
  - name: Multiple Subscription Types
    description: Exclusive, Shared, Failover, and Key_Shared subscription modes
- type: UseCases
  data:
  - name: Real-Time Event Streaming
    description: Stream events between microservices with guaranteed delivery
  - name: Message Queue
    description: Use Shared subscription as a traditional message queue
  - name: Event Sourcing
    description: Store and replay event streams for event-driven architectures
  - name: IoT Data Ingestion
    description: Ingest high-volume IoT telemetry into Pulsar topics
- type: Integrations
  data:
  - name: Apache Flink
    description: Pulsar connector for Flink stream processing
  - name: Apache Spark
    description: Spark Streaming integration via Pulsar connector
  - name: Apache Kafka
    description: Kafka-compatible protocol support for migration
  - name: Kubernetes
    description: Native Kubernetes deployment via Helm charts
  - name: Grafana
    description: Built-in metrics exposed to Prometheus and Grafana
- type: Integrations
  url: https://pulsar.apache.org/ecosystem/

Apache Pulsar

APIs 8

Open Collections 1

Pricing Plans 1

Rate Limits 1

FinOps 1

Features 7

Multi-Tenancy

Persistent Messaging

Geo-Replication

Pulsar Functions

Tiered Storage

Schema Registry

Multiple Subscription Types

Event Specifications 1

Semantic Vocabularies 1

Spectral Rules 3

JSON Schema 8

JSON Structure 7

Examples 7

Security Posture 2

Agentic Access 1

Use Cases 4

Real-Time Event Streaming

Message Queue

Event Sourcing

IoT Data Ingestion

Documentation 1

Agent Surfaces 1

Design & Contract 3

Build 1

Access & Security 2

Company 1

Source (apis.yml)