Postmon
An API to query Brazilian ZIP codes and orders easily, quickly and free
Provides information about parcels in transport for Sweden and Denmark.
PostNord API is a free Tracking API that requires apiKey authentication, is only available over HTTP and has unconfirmed CORS support.
Details from developer.postnord.com.

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.
An API to query Brazilian ZIP codes and orders easily, quickly and free
Automatically place subids in affiliate links to attribute affiliate conversions to click data
The PostNord API is provided by PostNord (developer.postnord.com).
Yes. The PostNord API is listed in the Tracking 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.
Yes. The PostNord API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the PostNord API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
No. The PostNord API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.