I've made around $2,800 total on Fiverr, it's basically like a micro-gig marketplace. I was selling an ebook I wrote so basically I would just send them the pdf file and make $4 per sale, but I also would answer questions via their messaging system. It's kinda hard to get started with your first few sales though, after you get some they come much more quickly.
This is my ref link, feel free to use it (or not! lol) I think I would only get paid on it if you made any purchases, but being that you would be there to sell stuff I don't think it gives me any benefit so feel free to disregard if you don't wanna use it.
I liked Fiverr in some aspects but in others I wasn't too happy. Occasionally you will get a bad apple that is impossible to please, but most people are fairly nice. The reviews are mandatory to keep above like 4.6+ or otherwise you will drop way down in searches. I was ranking number one for a pretty good search term for a while and was making like 10+ sales a day for a short while but I kinda quit using it as I was working a lot at a other job and wasn't putting in as much effort, which is a shame. I could use the extra $50-$60 a day now lol.
If you got any questions on Fiverr don't hesitate to message me, I used to run a blog and wrote a few articles on making money methods etc on there. I could give you some pointers if you decide you wanna try it out.