"Greetings! You've got a payment from MotionElements. Artist payout for Image and GIF (January 2017 - December 2017)"
Interesting. I think it was one of those initiatives that you get emailed about and can opt in or out... you know the type: "new ways for our members to generate additional revenue" etc etc... which I'd completely forgotten about. Strange you get paid on an annual basis though.
Unfortunately it was only $10.58, but as I only made $246 from normal sales from 2017, I wasn't expecting to get much when I first signed up.