As far as I know, it's $0.025 per stream. Spotify's rate is $0.003. Pretty substantial difference. TIDAL has the highest rate in the streaming industry.
EDIT: If you really want to support artists, go to Qobuz and buy albums. I'm planning to get a Sublime subscription so I can own my music and support artists even more (while not missing out on freedom to play what I want on demand).
Also, fixed the decimals and changed TIDAL to a more accurate average.