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 API contracts indexed 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 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

39.9/100 developing ▬ flat Agent 23/100 agent aware Front door AI 3/6 light Heartbeat 100/100 alive self hosted · Apache-2.0 Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

2 published contracts

NATS Cloud-Native IoT Message Broker Microservices Pub/Sub Real-Time

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

SaaS Platform Operations Management

BC-4220

ConnectionsGatewaysJetStreamLeaf NodesRoutesServer

GET /varz GET /ipqueuesz GET /connz GET /gatewayz

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 39.9/100 · developing

Contract Quality 11.6 / 21

Developer Ergonomics 8.5 / 17

Access Clarity 4.5 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

5 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 26.3 — up to +14.7 composite points
Contract Quality scores 54.5 — up to +11.4 composite points
Contract Governance scores 13.6 — up to +10.4 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/nats/apis.yml: open an issue on github.com/api-evangelist/nats to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Streaming (Apache Kafka protocol)	standard	59.4	-	-
OpenSSF Best Practices Badge Holders	standard	59.4	-	-
Artifact Hub Cloud-Native Packages	standard	59.4	-	-
Docker Hub Verified Publishers + Official Images	standard	59.4	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 3

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Pub/Sub

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

AsyncAPI

measured — observed by APIs.io (published)

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 12

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

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 12

NATS API pricing

Not yet checked against NATS's own pricing page. Compiled by API Evangelist on 2026-05-05 from www.synadia.com/cloud; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
NATS Open Source freemium	Free
Synadia Cloud — Personal freemium	Free
Synadia Cloud — Starter subscription	$49.00 per monthly subscription / month
Synadia Cloud — Pro subscription	$199.00 per monthly subscription / month
Synadia Cloud — Premium subscription	$899.00 per monthly subscription / month
Synadia Cloud — Enterprise enterprise	—
Synadia Cloud — Bring Your Own NATS subscription	$49.00 per monthly subscription / month
Synadia Cloud — Add-ons usage-based	$10.00 per connectivity package (10 extra connections) · $5.00 per extra leaf node

Plan details, limits and sources →

Rate limits

Max connections (per account, OSS): see account JWT max_connections claim concurrent connections
Max subscriptions (per account, OSS): see account JWT max_subscriptions claim concurrent subscriptions
Max payload (per account, OSS): see account JWT max_payload claim bytes per message

Compiled by API Evangelist, not yet checked against NATS's documentation. All 8 limits →

Billed by: month · FinOps profile →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

NATS

SLA

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 — asyncapi rules

5 rules · 5 warnings

SPECTRAL

NATS — jsonschema 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

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 6

Status, limits, changes, and where to get help

RateLimits

Slack

Issues

ChangeLog

Support

Community

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Download

Download

Source (apis.yml)

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: low
  try_now_blocked_by: loopback
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/nats.png
x-docs-platform: docusaurus
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
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: Plans
  url: plans/nats-plans-pricing.yml
- type: RateLimits
  url: rate-limits/nats-rate-limits.yml
- type: FinOps
  url: finops/nats-finops.yml
- type: CapabilityMap
  url: capabilities/nats-capability-edges.yml
  name: NATS Business Capability Map
- 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

NATS API — frequently asked questions

Does NATS have an API?

Yes. APIs.io lists 13 APIs from NATS, including NATS Messaging API, NATS JetStream Management API and NATS Key-Value Store API, and 10 more.

Is there an OpenAPI specification for the NATS API?

Yes. APIs.io indexes 9 OpenAPI specifications for NATS, each linked for download from this page.

How much does the NATS API cost?

APIs.io lists 8 pricing plans for NATS, with each plan's price, limits and inclusions under Pricing on this page.

Is the NATS API ready for AI agents?

NATS has a Kin Score of 39.9 out of 100 (developing) and an Agent Readiness score of 22.5 (agent-aware), scored by API Evangelist on 2026-11-06.

Work with this as data

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https://apis.io/mcp

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get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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