Dagpi
Image manipulation and processing
Generate, Edit, Scale and Manage Images and Videos Smarter & Faster.
Duply API is a free Photography API that requires apiKey authentication, is served over HTTPS and supports CORS, so it can be called from the browser.

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