Looks to be this:
https://github.com/pgaskin/kfwproxy
Quote:
Kobo API proxy for kobofirmware to enable cross-origin requests and caching. Each response is cached for 30 minutes to reduce the load on Kobo servers (otherwise there would be around half a million requests per day). In the future, kfwproxy will also support batched requests for better performance (currently, there are 112 requests per page load).
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It might work. But I'm not too keen on using it without permission.