You can borrow online books from them for a few hours/days: help.archive.org/hc/en-us/articles/360016554912-Borrowing-From-The-Lending-Library This is the most amazing thing ever made!!! You can even link to specific pages, e.g. archive.org/details/supermenstory00murr/page/80/mode/2up

They seem to a have a separate URL with the same content as well for some reason: openlibrary.org/, classic messy Internet Archive style.

Bastards are suing them www.theverge.com/2020/6/1/21277036/internet-archive-publishers-lawsuit-open-library-ebook-lending: Hachette, Penguin Random House, Wiley, and HarperCollins

It is quite hard to decide if an upload is from the official legal lending library, or just some illegal upload, e.g.:

archive.org/details/TheGoogleStory likely illegal
archive.org/details/isbn_9780385342728 likely legal

so the URLs are basically the same style. Some legality indicators:

Access-restricted-item: true
present in the collection: archive.org/details/internetarchivebooks?tab=about

Hachette v. Internet Archive (2023)

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Wayback Machine

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cirosantilli.com/china-dictatorship/wayback-machine

Wayback Machine save screen shot

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Feature added in 2019 apparently: www.reddit.com/r/DataHoarder/comments/dj6ot5/you_can_now_save_a_screenshot_of_your_saved_pages/ github.com/ourbigbook/template/archive/refs/heads/master.zip But TODO: how to access the screenshot afterwards?

archive.org/details/toomanyrequests_20191110 says 15 archives / minute, but apparently aslo 15 retrievals per minutes on Wikipedia, after which 5 min blacklist. After that, you start getting some 429s, and after that, server refuses to connect at al.

CDX: no limits apparently, they might just throttle you? Made 10k requets on bash loop and was going fine. But not that if you get blacklisted by create/fetch requests blacklist, server fails to connect here as well.