The main sources are space-track.org and celestrak - I use the space-track.org API. It works for me but my use case is likely different from yours
1 2The trick with the api there is you have to make one call to set the password cookie and then a second call to get the actual data
1 1Samuel
@samuel.fm
yeah… that’s a bit of a bummer. Would be much more convenient to just use an API key
1