Live parcel shipping rates and labels from a plain-words item description.
SMKlog API is a free Transportation API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Live AIS vessel traffic, crossings and oil flow through the Strait of Hormuz
Unified traffic data from 65 US/CA jurisdictions: events, cameras, signs, bridges, truck routes
Yes. The SMKlog 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 SMKlog API requires no authentication, so you can start making requests without signing up.
Not directly. The SMKlog API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The SMKlog API is served over HTTPS, so it's safe to use in production.