The Maritime industry on apis.io indexes 67 providers publishing 451 APIs. The highest Kin Score among them is 48.8. Not one provider in the vertical reaches the strong band, and 30 of the 67 are minimal. Global trade runs on ocean freight, and the public API surface behind it is thin from top to bottom.
Who leads, by function
| Function | Providers (Kin Score) |
|---|---|
| Vessel tracking and AIS | VesselFinder 48.8, MarineTraffic 43.2, AISStream 35.8, Datalastic 33.1 |
| Container carriers | Maersk 48.1, CMA CGM 14.2, Hapag-Lloyd 5.6, MSC 5.4, COSCO Shipping 3.3 |
| Classification and fleet operations | DNV 46.9, SERTICA 46.0, SEDNA 40.0 |
| Ports and terminals | Navis (Kaleris) 43.4, Port Community Systems 36.1, DP World 7.6 |
| Ocean data | Sofar Ocean 46.6, Kpler 36.5 |
Three patterns in the record
The data companies lead, not the ship owners. The top of the vertical belongs to the people who watch ships: VesselFinder at 48.8 with ship positions, port calls, sea-distance routing and container track-and-trace, then MarineTraffic with 9 APIs at 43.2. Tracking data is sold by the call, so it gets a developer surface. Moving freight has traditionally been sold by the contract.
One carrier publishes, the rest barely register. Maersk scores 48.1 across 8 APIs. The next liner is CMA CGM at 14.2. Hapag-Lloyd, MSC, ZIM, Ocean Network Express and COSCO Shipping all sit between 3.3 and 5.6. The Kin Score measures only the public surface, so partner-gated integrations do not count, and that is exactly the point: a shipper evaluating carriers cannot see what most of them offer before signing.
The new entrants are autonomy companies with no surface at all. Saronic at 11.3, Blue Water Autonomy at 10.3, HavocAI at 9.2 and a long tail of uncrewed-vessel builders below them publish nothing callable. Saildrone, at 36.8, is the exception. The newest names in the vertical arrive as companies, not as APIs.
Agent readiness follows the same curve. The best maritime-native reading is SEDNA at 35.1, agent-ready, and Maersk sits at 22.8, agent-aware. Membership here is computed from tags, which is why Starlink (43.3) and the weather providers Xweather (42.7) and Tomorrow.io (38.5) appear alongside the shipping lines. They serve ships rather than run them, and none of them clears developing either.
Where to start
For vessel positions and port events, start with VesselFinder. For booking, schedules and track-and-trace against a carrier, Maersk is the only liner in the vertical with a scored surface worth integrating against today, and because many of its APIs implement DCSA interface standards, a client built for Maersk is a head start on the next carrier that adopts them. For classification and fleet data, DNV at 46.9 and SERTICA at 46.0.
Takeaway
Maritime’s problem is less quality than absence. The eleven best-scoring providers all land in developing, between 40.0 and 48.8. The providers that do not publish are the carriers that move most of the world’s containers. The first liner after Maersk to publish open, documented, self-serve contracts for schedules and track-and-trace would lead the vertical on the day it shipped. Browse the full vertical at apis.io/industries/maritime/.