The headline totals and their read windows, under 1 KB

Scalars only, for a small screen or a status badge. Counts (stocks, instruments, listings, issuers, chains) are read at generatedAt. A money or holder figure travels as a quartet: the value, the oldest read behind it (marketCapFrom / holdersFrom), the newest (marketCapTo / holdersTo), and a listing count naming its coverage (marketCapListings / holderListings). The range is published because holder books are replayed per chain on different days, so one date would overstate freshness. An absent key means not read - never zero, and never null. holders counts one address holding one listing, so a wallet holding several is counted more than once. There is no list in this payload, so nothing in it is ordered. Carries no price for any named stock and no 24h volume.