Nice, narrowing down by relay supporting nip 15 and created/updated stall event per one of the popular relays (like 3-4 are default in lnbits nostr market for now), you can queue the hex pubs/events of the merchants who actually sell something on nostr market and find their stalls on the lnbits nostr market client. This should be simpler (till the clients start to display these as well) but it is a start.

Also someone was complaining about some public chat group disappearing from time to time (nip28). Maybe a relay support issue or up/down time. So having the list of the other supporting relays def helps the confusion. Great work 🤙