The main protocol is called NTRIP. Lots of sources make it available (though it might be annoying to stream from ~250 simultaneously, not sure). There's a lot if you search that term though.
I think GEONET (the Japanese data source) might have some NTRIP casters. Also some in Korea and elsewhere. Sometimes you have to pay for access though, so I need to look more.
I think GEONET (the Japanese data source) might have some NTRIP casters. Also some in Korea and elsewhere. Sometimes you have to pay for access though, so I need to look more.