I just received three emails from 500px this evening. I was informed that three of my images were sold.
In other words, I can expect a payment of $2.55. In all honesty, it feels like a mockery.
When 500px launched Marketplace in 2014 we photographers could receive a 70% commission if 500px was our sole licensing agent for a particular image. Back then it was actually possible to get a decent payment if you sold a few images.