Provides screenshot, HTML to PDF and content extraction APIs.
Restpack API is a free Documents & Productivity API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Restpack is a company focused on building great restful microservices for developers and businesses.
Details from restpack.io.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Send PDFs, ZPL labels and ESC/POS receipts to your own printers from any language; free tier
The Restpack API is provided by Restpack (restpack.io). Restpack is a company focused on building great restful microservices for developers and businesses.
Yes. The Restpack API is listed in the Documents & Productivity 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 Restpack API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Restpack API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Restpack API is served over HTTPS, so it's safe to use in production.