Apimetro
Geospatial data for Mexico City public transport system (Metro, Metrobús, Cablebús, RTP, etc.)
Screen any ship by IMO for OFAC/EU/UN/UK sanctions, ownership opacity and a vetting grade.
ArcNautical API is a free Transportation API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Screen any vessel by IMO for sanctions, ownership opacity and a vetting grade: one keyless GET, then batches, standing monitors and signed webhooks on a self-serve key. Voyage risk scoring on the same key.
Details from arcnautical.com.

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Geospatial data for Mexico City public transport system (Metro, Metrobús, Cablebús, RTP, etc.)
164,068 aircraft accident narratives from 128 official investigation authorities, plus FAA data
FAA Aeronautical Charts and Publications, Airport Information, and Airport Weather
The ArcNautical API is provided by ArcNautical (arcnautical.com). Screen any vessel by IMO for sanctions, ownership opacity and a vetting grade: one keyless GET, then batches, standing monitors and signed webhooks on a self-serve key. Voyage risk scoring on the same key.
Yes. The ArcNautical API is listed in the Transportation category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The ArcNautical API requires no authentication, so you can start making requests without signing up.
Yes. The ArcNautical API supports CORS, so front-end JavaScript can call it directly.
Yes. The ArcNautical API is served over HTTPS, so it's safe to use in production.