I did an Etsy search similar to this, with "instant" search instead of scrolling. I have to say I like your approach better.

A few questions about your Etsy API experience - can you now see who purchased through your site? At the time they had no feedback loop and no sort of affiliate program. Building my Etsy app was a lot of fun, but I had no way to monetize my work. I'm a bit out of the Etsy API loop now, but I do hope they've come up with some way to help devs make money.