[deltaknight]

Thank you! The data comes from a SignalR data stream that F1 provides. It's not exactly public, but also not protected. There are some other projects (like FastF1) which have done a lot of working understanding this data, so all kudos go to them.

There's also static API endpoints which contain .json and .jsonStream files after a session ends, so you can process all the data and run some analytics on it.

I assume they don't mind too much about the usage - on the basis that some of these projects have existed for quite a while. I'm pretty sure everything who performs F1 analysis (like journalists, YouTubers etc) with charts and the like and getting their data via these feeds (either directly or via packages like FastF1.

If you want to learn more about the implementation itself, I'd recommend checking out the DataImporter.cs and LiveTimingClient.cs files in the UndercutF1.Data project of the repo. Although fair warning, my codes not that beautiful :).