That was partially the original promise of Fever, which is the API many RSS services still support and that somehow lives on. Nuzzle did something similar for

That was partially the original promise of Fever, which is the API many RSS services still support and that somehow lives on. Nuzzle did something similar for Twitter but shut down (https://daringfireball.net/linked/2021/05/05/nuzzel https://daringfireball.net/linked/2021/05/05/nuzzel). That would be a good addition to feed readers, especially for news feeds.