NATS website screenshot

NATS

A high-performance, cloud-native messaging system for microservices, IoT, and edge computing. Provides pub-sub, request-reply, and queue-based messaging patterns with at-most-once and at-least-once delivery guarantees.

NATS publishes 13 APIs on the APIs.io network, including Messaging API, JetStream Management API, Accounts API, and 10 more. Tagged areas include NATS, Cloud-Native, IoT, Message Broker, and Microservices.

The NATS catalog on APIs.io includes 1 event-driven AsyncAPI specification and 2 Spectral governance rulesets.

NATS’s developer surface includes documentation, getting-started guide, engineering blog, changelog, code examples, CLI, support, and 17 more developer resources.

🌐 Visit website 📡 Source on GitHub
40.3/100 developing ▬ flat Agent 23/100 agent aware Front door AI 3/6 light self hosted · Apache-2.0 Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0
AccessFreemium
2 APIs
NATSCloud-NativeIoTMessage BrokerMicroservicesPub-SubReal-Time

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0
Composite quality — 40.3/100 · developing
Contract Quality 11.6 / 21
Developer Ergonomics 8.5 / 17
Access Clarity 4.9 / 17
Operational Transparency 3.2 / 11
Contract Governance 1.4 / 10
Discoverability 5.5 / 9
Regulatory Posture 1.5 / 15
Agent readiness — 23/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 6 / 6
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 9 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 7 / 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 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
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 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.
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/.
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/nats: 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 13

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

NATS Messaging API

Asynchronous messaging API supporting core pub-sub, request-reply, queue groups, and JetStream persistent messaging with streams, consumers, key-value stores, and object stores.

NATS JetStream Management API

The JetStream wire API provides a protocol-level management interface for configuring and operating JetStream streams, consumers, key-value buckets, and object stores. Requests ...

NATS Key-Value Store API

The NATS Key-Value Store API is a JetStream-backed abstraction that provides immediately consistent, persistent associative array semantics. Clients can create buckets, get, put...

NATS Object Store API

The NATS Object Store API is a JetStream-backed abstraction for storing and retrieving arbitrarily large binary objects using a chunking mechanism. Objects are identified by a b...

NATS Accounts API

The Accounts API from NATS — 1 operation(s) for accounts.

NATS Connections API

The Connections API from NATS — 1 operation(s) for connections.

NATS Gateways API

The Gateways API from NATS — 1 operation(s) for gateways.

NATS Health API

The Health API from NATS — 1 operation(s) for health.

NATS JetStream API

The JetStream API from NATS — 1 operation(s) for jetstream.

NATS Leaf Nodes API

The Leaf Nodes API from NATS — 1 operation(s) for leaf nodes.

NATS Routes API

The Routes API from NATS — 1 operation(s) for routes.

NATS Server API

The Server API from NATS — 2 operation(s) for server.

NATS Subscriptions API

The Subscriptions API from NATS — 1 operation(s) for subscriptions.

Scroll for all 13

Open Collections 13

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

API Collection

OPEN COLLECTION

NATS Monitoring HTTP Accounts API

OPEN COLLECTION

NATS Monitoring HTTP Accounts Clustering API

OPEN COLLECTION

NATS Monitoring HTTP Accounts Connections API

OPEN COLLECTION

NATS Monitoring HTTP Accounts Gateways API

OPEN COLLECTION

NATS Monitoring HTTP Accounts Health API

OPEN COLLECTION

NATS Monitoring HTTP Accounts JetStream API

OPEN COLLECTION

NATS Monitoring HTTP Accounts Leaf Nodes API

OPEN COLLECTION

NATS HTTP Accounts Monitoring API

OPEN COLLECTION

NATS Monitoring HTTP API

OPEN COLLECTION

NATS Monitoring HTTP Accounts Routes API

OPEN COLLECTION

NATS Monitoring HTTP Accounts Server API

OPEN COLLECTION

NATS Monitoring HTTP Accounts Subscriptions API

OPEN COLLECTION

Scroll for all 13

Pricing Plans 1

Published pricing tiers and plan structures.

Nats Plans Pricing

8 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Nats Rate Limits

8 limits

RATE LIMITS

FinOps 1

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

Nats Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

NATS Core and JetStream Messaging API

NATS provides cloud-native messaging with core pub-sub, request-reply, and queue group patterns, plus JetStream for persistent streaming with streams, consumers, key-value store...

ASYNCAPI

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

NATS API Rules

5 rules · 5 warnings

SPECTRAL

NATS API Rules

5 rules · 4 warnings 1 info

SPECTRAL

JSON Schema 1

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

NATS JetStream Stream Configuration

19 properties

JSON SCHEMA

Security Posture 1

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

Nats Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Nats Agentic Access

10 operations

10 operations · 0 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Documentation 5

Reference material describing how the API behaves

Documentation
Documentation
 JSONSchema
JSONSchema
 JSONSchema
JSONSchema
 JSONSchema
JSONSchema
 JSONSchema
JSONSchema

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LlmsText
LlmsText

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLD
JSONLD

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubRepository
GitHubRepository
 Examples
Examples
 CLI
CLI
 GitHubOrganization
GitHubOrganization
 SDKs
SDKs

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 5

Status, limits, changes, and where to get help

Slack
Slack
 Issues
Issues
 ChangeLog
ChangeLog
 Support
Support
 Community
Community

Commercial 1

Pricing, plans, and the legal terms of use

PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

Download
Download

Source (apis.yml)

apis.yml Raw ↑ 
aid: nats
name: NATS
description: A high-performance, cloud-native messaging system for microservices, IoT, and edge computing. Provides pub-sub,
  request-reply, and queue-based messaging patterns with at-most-once and at-least-once delivery guarantees.
type: Index
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  license_evidence:
    repo: nats-io/nats-server
    spdx: Apache-2.0
    stars: 20769
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: medium
  source:
  - openapi
  - repository-license
  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://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/nats.png
tags:
- NATS
- Cloud-Native
- IoT
- Message Broker
- Microservices
- Pub-Sub
- Real-Time
tags_raw:
- NATS
- Cloud Native
- IoT
- Message Broker
- Microservices
- Pub Sub
- Real-Time
url: https://raw.githubusercontent.com/api-evangelist/nats/refs/heads/main/apis.yml
created: '2025-01-01'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: nats:nats-messaging-api
  name: NATS Messaging API
  description: Asynchronous messaging API supporting core pub-sub, request-reply, queue groups, and JetStream persistent messaging
    with streams, consumers, key-value stores, and object stores.
  humanURL: https://docs.nats.io/nats-concepts/core-nats
  tags:
  - JetStream
  - Messaging
  - Pub-Sub
  - Streaming
  tags_raw:
  - JetStream
  - Messaging
  - Pub Sub
  - Streaming
  properties:
  - url: https://docs.nats.io/nats-concepts/core-nats
    type: Documentation
  - url: properties/nats-messaging-asyncapi.yml
    type: AsyncAPI
  - url: asyncapi/nats-messaging.yml
    type: AsyncAPI
  - url: json-schema/nats-stream-config.json
    type: JSONSchema
- aid: nats:nats-jetstream-management-api
  name: NATS JetStream Management API
  description: The JetStream wire API provides a protocol-level management interface for configuring and operating JetStream
    streams, consumers, key-value buckets, and object stores. Requests are made by publishing to well-known $JS.API.* subjects
    and responses are returned as typed JSON payloads. This API underlies all official NATS client SDKs and the nats CLI.
  humanURL: https://docs.nats.io/reference/reference-protocols/nats_api_reference
  tags:
  - JetStream
  - Management
  - Streaming
  properties:
  - url: https://docs.nats.io/reference/reference-protocols/nats_api_reference
    type: Documentation
  - url: https://docs.nats.io/nats-concepts/jetstream
    type: Reference
  - url: properties/nats-jetstream-api-asyncapi.yml
    type: AsyncAPI
  - url: properties/nats-jetstream-config-json-schema.json
    type: JSONSchema
- aid: nats:nats-kv-api
  name: NATS Key-Value Store API
  description: The NATS Key-Value Store API is a JetStream-backed abstraction that provides immediately consistent, persistent
    associative array semantics. Clients can create buckets, get, put, delete, and watch keys, and receive real-time change
    notifications. Buckets are implemented as JetStream streams with the KV_ prefix.
  humanURL: https://docs.nats.io/nats-concepts/jetstream/key-value-store
  tags:
  - JetStream
  - Key-Value Store
  - Storage
  tags_raw:
  - JetStream
  - Key-Value
  - Storage
  properties:
  - url: https://docs.nats.io/nats-concepts/jetstream/key-value-store
    type: Documentation
  - url: https://docs.nats.io/using-nats/developer/develop_jetstream/kv
    type: Reference
  - url: properties/nats-kv-schema.json
    type: JSONSchema
- aid: nats:nats-object-store-api
  name: NATS Object Store API
  description: The NATS Object Store API is a JetStream-backed abstraction for storing and retrieving arbitrarily large binary
    objects using a chunking mechanism. Objects are identified by a bucket and a name, and the API supports put, get, delete,
    and watch operations for managing stored files and blobs.
  humanURL: https://docs.nats.io/nats-concepts/jetstream/obj_store
  tags:
  - JetStream
  - Object Store
  - Storage
  properties:
  - url: https://docs.nats.io/nats-concepts/jetstream/obj_store
    type: Documentation
  - url: https://docs.nats.io/using-nats/developer/develop_jetstream/object
    type: Reference
  - url: properties/nats-object-store-schema.json
    type: JSONSchema
- aid: nats:nats-accounts-api
  name: NATS Accounts API
  description: The Accounts API from NATS — 1 operation(s) for accounts.
  humanURL: https://docs.nats.io/running-a-nats-service/nats_admin/monitoring
  baseURL: http://localhost:8222
  tags:
  - Account
  tags_raw:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/nats-accounts-api-openapi.yml
- aid: nats:nats-connections-api
  name: NATS Connections API
  description: The Connections API from NATS — 1 operation(s) for connections.
  humanURL: https://docs.nats.io/running-a-nats-service/nats_admin/monitoring
  baseURL: http://localhost:8222
  tags:
  - Connections
  properties:
  - type: OpenAPI
    url: openapi/nats-connections-api-openapi.yml
- aid: nats:nats-gateways-api
  name: NATS Gateways API
  description: The Gateways API from NATS — 1 operation(s) for gateways.
  humanURL: https://docs.nats.io/running-a-nats-service/nats_admin/monitoring
  baseURL: http://localhost:8222
  tags:
  - Gateways
  properties:
  - type: OpenAPI
    url: openapi/nats-gateways-api-openapi.yml
- aid: nats:nats-health-api
  name: NATS Health API
  description: The Health API from NATS — 1 operation(s) for health.
  humanURL: https://docs.nats.io/running-a-nats-service/nats_admin/monitoring
  baseURL: http://localhost:8222
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/nats-health-api-openapi.yml
- aid: nats:nats-jetstream-api
  name: NATS JetStream API
  description: The JetStream API from NATS — 1 operation(s) for jetstream.
  humanURL: https://docs.nats.io/running-a-nats-service/nats_admin/monitoring
  baseURL: http://localhost:8222
  tags:
  - JetStream
  properties:
  - type: OpenAPI
    url: openapi/nats-jetstream-api-openapi.yml
- aid: nats:nats-leaf-nodes-api
  name: NATS Leaf Nodes API
  description: The Leaf Nodes API from NATS — 1 operation(s) for leaf nodes.
  humanURL: https://docs.nats.io/running-a-nats-service/nats_admin/monitoring
  baseURL: http://localhost:8222
  tags:
  - Leaf Nodes
  properties:
  - type: OpenAPI
    url: openapi/nats-leaf-nodes-api-openapi.yml
- aid: nats:nats-routes-api
  name: NATS Routes API
  description: The Routes API from NATS — 1 operation(s) for routes.
  humanURL: https://docs.nats.io/running-a-nats-service/nats_admin/monitoring
  baseURL: http://localhost:8222
  tags:
  - Routes
  properties:
  - type: OpenAPI
    url: openapi/nats-routes-api-openapi.yml
- aid: nats:nats-server-api
  name: NATS Server API
  description: The Server API from NATS — 2 operation(s) for server.
  humanURL: https://docs.nats.io/running-a-nats-service/nats_admin/monitoring
  baseURL: http://localhost:8222
  tags:
  - Servers
  tags_raw:
  - Server
  properties:
  - type: OpenAPI
    url: openapi/nats-server-api-openapi.yml
- aid: nats:nats-subscriptions-api
  name: NATS Subscriptions API
  description: The Subscriptions API from NATS — 1 operation(s) for subscriptions.
  humanURL: https://docs.nats.io/running-a-nats-service/nats_admin/monitoring
  baseURL: http://localhost:8222
  tags:
  - Subscription
  tags_raw:
  - Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/nats-subscriptions-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/nats-agentic-access.yml
- type: DomainSecurity
  url: security/nats-domain-security.yml
- url: https://nats.io
  type: Website
- url: https://docs.nats.io
  type: Documentation
- url: https://docs.nats.io/running-a-nats-service/introduction/installation
  type: GettingStarted
- url: https://github.com/nats-io/nats-server
  type: GitHubRepository
- url: https://nats.io/blog/
  type: Blog
- url: https://slack.nats.io
  type: Slack
- url: https://github.com/nats-io/nats-server/issues
  type: Issues
- url: https://github.com/nats-io/nats-server/releases
  type: ChangeLog
- url: https://natsbyexample.com
  type: Examples
- url: https://docs.nats.io/using-nats/nats-tools/nats_cli
  type: CLI
- url: https://github.com/nats-io
  type: GitHubOrganization
- url: properties/nats-server-config-json-schema.json
  type: JSONSchema
- url: properties/nats-jetstream-config-json-schema.json
  type: JSONSchema
- url: properties/nats-kv-schema.json
  type: JSONSchema
- url: properties/nats-object-store-schema.json
  type: JSONSchema
- url: properties/nats-context-jsonld.json
  type: JSONLD
- url: https://nats.io/support/
  type: Support
- url: https://nats.io/privacy/
  type: PrivacyPolicy
- url: https://nats.io/community/
  type: Community
- url: https://docs.nats.io/using-nats/developer
  type: SDKs
- url: https://nats.io/download/
  type: Download
- type: LlmsText
  url: https://docs.nats.io/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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