Ratings are quite important and even in 2015 they remain the best indication of a show’s likelihood of staying on the air. And things are not going that well for The Expanse according to this article.
So if you want quality genre TV shows like James S. A. Corey's The Expanse to stay on the air, please watch them the traditional way when the episodes are aired, or on the channel's official website.
If you don't, it just might be the next Firefly. . . =(
If you are based in the USA, you can watch all current episodes in HD for free on the Syfy website.
Unfortunately, the Syfy website features territorial rights, so it's not available everywhere around the world. So if, like me, its content is unavailable in your country, you can try watching the show for free in HD on Canada's Space channel's website.
I've watched all four episodes thus far and it's been pretty good. And the story went up a notch in the last episode, which bodes well for the rest of the season! =) But if the ratings remain low, then chances are that the show won't be renewed. So if at all possible, try to watch it live on TV when the episodes air each week. If you can't, as long as we watch it via legal means (TV, DVR, online on the network's official website or YouTube channel), they have something to show for it and it's good for the show. But the TV ratings remain the most important stat...