Autogenerate images with template.
Supportivekoala API is a free Development API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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Yes. The Supportivekoala API is listed in the Development 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 Supportivekoala API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Supportivekoala API supports CORS, so front-end JavaScript can call it directly.
Yes. The Supportivekoala API is served over HTTPS, so it's safe to use in production.