Yes, this is exactly what they started with in 2011, see the launch post: https://news.ycombinator.com/item?id=2406614

> Over this past weekend I had the idea to build a sort of link shortener but with a payment system built-in. There have been many times in the past where I wanted to share a link - on Twitter or just through IM with a few friends - but did not want to go through the overhead of setting up a whole store.

All the same comments as here, but I suppose they ultimately pivoted away from the link format. I suppose it's the perfect MVP though!