Used to retrieve and apply transformations to images.
Contentful Images 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 Contentful Images 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 Contentful Images API uses apiKey authentication, so you need to register for credentials before making requests.
Yes. The Contentful Images API supports CORS, so front-end JavaScript can call it directly.
Yes. The Contentful Images API is served over HTTPS, so it's safe to use in production.