I built a system to help people take payments with Google Forms. It was very much an MVP but I lucked into a niche that hadn't been filled, so each week a few p

I built a system to help people take payments with Google Forms. It was very much an MVP but I lucked into a niche that hadn't been filled, so each week a few people found it and started to use it. I charged 2% of the transaction volume (later lowered to 1.5%) and made about $3k before shutting it down at the end of last year to focus on other things. Interestingly by that point there were much better, cheaper alternatives and the friction of switching was low, but I had a hard time convincing people to stop using it.