# AISStream

**Canonical:** https://apis.io/providers/aisstream/  
**Website:** https://aisstream.io  
**APIs profiled:** 1

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.

## Kin Score — 34.9 / 100 (thin)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 34.9).

| Facet | Score |
|---|---|
| Discoverability | 68.5 |
| Contract Quality | 48.9 |
| Governance | 11.4 |
| Contract Governance | 11.4 |
| Operational Transparency | 34.2 |
| Developer Ergonomics | 21.4 |
| Commercial Clarity | 28.9 |
| Access Clarity | 28.9 |

## Agent readiness — 28.2 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | derived |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Free · Self-serve signup — onboarding: self-serve, pricing: free, trial: no (confidence: high).

## APIs (1)

- **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...

## Security (2)

- **Aisstream Authentication** — apiKey · 1 scheme
- **Aisstream Domain Security** — TLSv1.3 · DMARC

## Plans (1)

- **Aisstream Plans Pricing**

## Tags

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

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/aisstream/). Scores are computed from the provider's own public artifacts under a published rubric.