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I remember that kind of thrill. For a while I ran a tool for Etsy before they had an API, circa 2007. What they did have was AMFPHP, powering their flash toys (treasury, etc). I used it to allow sellers to see their sales stats.

Even went to the Etsy office in Brooklyn at one point and had a chat about it. I think some of the team was a bit bemused that I'd essentially extracted a large amount of data. But they took forever to get to the point of having an actual API (and I was one of the early users of this as well).

Eventually it became unsustainable and I shut it down, but it sure was fun having people be passionate about using it and sharing it.