Open Government, ACT
Australian Capital Territory Open Data
Argentina Government Open Data.
Open Government, Argentina API is a free Government API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Details from datos.gob.ar.

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Australian Capital Territory Open Data
French DGFiP registry of certified e-invoicing platforms (Plateformes Agréées), searchable by SIRET
The Open Government, Argentina API is provided by Datos Argentina (datos.gob.ar).
Yes. The Open Government, Argentina 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 Open Government, Argentina API requires no authentication, so you can start making requests without signing up.
CORS support for the Open Government, Argentina API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Open Government, Argentina API is served over HTTPS, so it's safe to use in production.