Everything is done with real time calls to the eBay API. eBay's catalogue is too large to make it realistic to fetch it as a whole and, anyway, as far as I remember they don't offer a data dump (it's been a long time since I checked).
Luckily, eBay's API is very fast, but I also worked hard to keep the total response time of my code within a reasonable range.
Luckily, eBay's API is very fast, but I also worked hard to keep the total response time of my code within a reasonable range.