I run biggysearch.net, a different index of the same wall, so take this as one builder to another rather than a feature request.

The up to date stock levels ask in this thread is the one I would warn you about before you build it. LB's items wall feed does not always return the whole wall, and it does not tell you when it has not.

I have 1,317 syncs of that feed logged since 7 August. Most days the item count sits within a few of that day's median. Two days did not. On 16 September most reads came back between 801 and 816 items, and on 18 September between 803 and 810, while the true number both days was about 940. Every one of those came back as a normal 200 with no error on it.

That matters because the obvious way to spot a delisting is "it was there yesterday and it is not in this feed". On those two days that rule quietly killed about 140 live listings at once, then resurrected them when the feed recovered. Mine did exactly that before I caught it, and it also poisoned my own history, so anything I had built on what went out of stock was partly fiction.

What fixed it, in case it saves you the same week: treat any feed that comes back under about 95 percent of a rolling median of recent feeds as incomplete rather than authoritative. Trust the listings it does contain, conclude nothing from the ones it does not. Then require a listing to be absent from three consecutive complete feeds before calling it gone. A real delisting still lands within the hour, and a bad feed stops meaning anything.

Same trap applies to any per seller count. A seller who looks like they pulled their whole catalogue overnight is usually a short feed rather than an exit. I had one of those on my screen last week and very nearly said so out loud, which would have been embarrassing and wrong.

Good work on the site, and on opening it up.

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