AISStream

AISStream.io is a free service that streams global real-time AIS (Automatic Identification System) vessel-tracking data over a WebSocket. Clients register for a free API key, open a secure WebSocket to "wss://stream.aisstream.io/v0/stream", and send a JSON subscription message declaring one or more geographic bounding boxes plus optional MMSI and message-type filters. The server then pushes a continuous stream of AIS messages - PositionReport, ShipStaticData, and the full set of ITU-R M.1371 message types - each wrapped in an envelope carrying MessageType, MetaData, and the decoded Message. There is no REST API; the service is WebSocket-only.

AISStream is listed with 1 API on the APIs.io network: AIS Stream API. Tagged areas include Vessel Tracking, AIS, Maritime, Ship Tracking, and Real-Time Data.

The AISStream catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

AISStream’s developer surface includes authentication, documentation, and 6 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

28.9/100 thin ▼ -6.9 Agent 17/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-10-17 · rubric v0.24.0

AccessFreeSelf serve⚡ Free to try

1 API

Vessel Tracking AIS Maritime Ship Tracking Real-Time Data WebSocket Streaming Ships Maritime Data Location Real-Time

Kin Score

Kin Score How this is scored →
scored 2026-10-17 · rubric v0.24.0

Composite quality — 28.9/100 · thin

Contract Quality 9.3 / 21

Developer Ergonomics 6.8 / 17

Access Clarity 0.9 / 17

Operational Transparency 1.2 / 11

Contract Governance 1.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 1.8 / 15

Agent readiness — 17/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 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

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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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/aisstream: 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 →

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
Maritime Logistics (ocean shipping, eBL, ports)	undeclared	-	-	-

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 2

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.

AIS

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

WebSockets

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

APIs 1

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

AISStream AIS Stream API

Real-time global AIS vessel-tracking stream delivered over a single WebSocket at "wss://stream.aisstream.io/v0/stream". The client connects, sends a JSON subscription message (A...

Open Collections 1

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

AISStream AIS Stream API (WebSocket)

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Aisstream Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Aisstream Rate Limits

3 limits

RATE LIMITS

FinOps 1

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

Aisstream Finops

FINOPS

Event Specifications 1

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

AISStream Real-Time AIS Stream (WebSocket)

AsyncAPI 2.6 description of **AISStream.io**, a free service that streams global real-time AIS (Automatic Identification System) vessel-tracking data over a **WebSocket**. This ...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

AISStream — asyncapi rules

5 rules · 1 errors 4 warnings

SPECTRAL

Security Posture 2

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

Aisstream Authentication

apiKey · 1 scheme

SECURITY

Aisstream Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: aisstream
url: https://raw.githubusercontent.com/api-evangelist/aisstream/refs/heads/main/apis.yml
name: AISStream
kind: company
description: AISStream.io is a free service that streams global real-time AIS (Automatic Identification System) vessel-tracking
  data over a WebSocket. Clients register for a free API key, open a secure WebSocket to "wss://stream.aisstream.io/v0/stream",
  and send a JSON subscription message declaring one or more geographic bounding boxes plus optional MMSI and message-type
  filters. The server then pushes a continuous stream of AIS messages - PositionReport, ShipStaticData, and the full set of
  ITU-R M.1371 message types - each wrapped in an envelope carrying MessageType, MetaData, and the decoded Message. There
  is no REST API; the service is WebSocket-only.
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - aisstream/ais-message-models
  open_source: unknown
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Free · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/aisstream.png
tags:
- Vessel Tracking
- AIS
- Maritime
- Ship Tracking
- Real-Time Data
- WebSocket
- Streaming
- Ships
- Maritime Data
- Location
- Real-Time
created: '2026-07-12'
modified: '2026-07-12'
specificationVersion: '0.23'
apis:
- aid: aisstream:aisstream-ais-stream-api
  name: AISStream AIS Stream API
  tags:
  - AIS
  - Vessel Tracking
  - WebSocket
  - Streaming
  - Real-Time Data
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://aisstream.io/documentation
  baseURL: wss://stream.aisstream.io/v0/stream
  properties:
  - url: https://aisstream.io/documentation
    type: Documentation
  - url: https://aisstream.io/documentation
    type: APIReference
  - url: asyncapi/aisstream-asyncapi.yml
    type: AsyncAPI
  - url: collections/aisstream.postman_collection.json
    type: PostmanCollection
  - url: collections/aisstream.opencollection.json
    type: OpenCollection
  - url: https://github.com/aisstream/ais-message-models
    type: SourceCode
  - url: https://github.com/aisstream/example
    type: SDK
  description: Real-time global AIS vessel-tracking stream delivered over a single WebSocket at "wss://stream.aisstream.io/v0/stream".
    The client connects, sends a JSON subscription message (APIKey plus BoundingBoxes and optional FiltersShipMMSI and FilterMessageTypes),
    and receives a continuous feed of AIS messages - each an envelope with MessageType, a free-form MetaData object, and the
    decoded Message keyed by its type (PositionReport, ShipStaticData, and the rest of the ITU-R M.1371 message set).
common:
- type: DomainSecurity
  url: security/aisstream-domain-security.yml
- type: Authentication
  url: authentication/aisstream-authentication.yml
- type: GitHubOrganization
  url: https://github.com/aisstream
- type: Website
  url: https://aisstream.io
- type: Documentation
  url: https://aisstream.io/documentation
- type: Plans
  url: plans/aisstream-plans-pricing.yml
- type: RateLimits
  url: rate-limits/aisstream-rate-limits.yml
- type: FinOps
  url: finops/aisstream-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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