Any tips on pulling that off? You make it sound very easy(couple of years seems pretty damn fast to me), so maybe you, like the author, could share what you think led to your success?
Now they pay monthly and it’s been a good recurring source of income for me.
Another project was something I built for myself a few years ago (macvendors.com) and made available. After about 4-5 years traffic picked up and it started to grow. Now I receive about 350 million API request per month and growing. We recently introduced paid plans but the income from them is pretty much irrelevant, under $100/m. The site makes a little bit of ad revenue though which helps.