Right now the API is nonexistent, relying entirely on people using the web interface to make listings, upload photos, and set prices. But if you would find this useful I can happily build it out. Our stack is Elixir and building APIs is very straightforward. Our code is open-source, too!

When you say "algorithmically driven print-on-demand" do you mean that prices would automatically adjust based on inventory? Or like, how do you mean.

Also, when you say "see them show up in a request on sale" — can you clarify? I interpret this to mean you want a webhook triggered when an order comes in.