Quality of Life Data.
Teleport API is a free Open Data API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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.
US property records by address: parcel, owner, appraised value, tax, flood zone and nearby schools
Economic data for 218 countries — GDP, population, inflation, and 440+ indicators from IMF and World Bank
1,000+ AI deployments, each linked to the publisher's own page, JSON and CSV, CC BY 4.0
VPS and cloud server prices from 46 providers, read daily from their own pricing pages and APIs
Yes. The Teleport API is listed in the Open Data 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 Teleport API requires no authentication, so you can start making requests without signing up.
CORS support for the Teleport API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Teleport API is served over HTTPS, so it's safe to use in production.