Istanbul (İBB) Open Data
Data sets from the İstanbul Metropolitan Municipality (İBB)
Japan grants and subsidies (central J-Grants + 1,916 municipalities).
LocalGov.jp API is a free Government API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Data sets from the İstanbul Metropolitan Municipality (İBB)
Access and search Interpol Red Notices
Peruvian Statistical Government Open Data
French DGFiP registry of certified e-invoicing platforms (Plateformes Agréées), searchable by SIRET
Yes. The LocalGov.jp API is listed in the Government 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 LocalGov.jp API requires no authentication, so you can start making requests without signing up.
Yes. The LocalGov.jp API supports CORS, so front-end JavaScript can call it directly.
Yes. The LocalGov.jp API is served over HTTPS, so it's safe to use in production.