Use for a one-call macro view of the x402 economy: how many indexed services are live, total/paid/free resources, the USD price distribution (min/p25/median/p75/max), and resource counts by network and category, with a per-service breakdown. The daily history of this index accumulates in the point-in-time archive as feed x402.catalogs. From x402stock, a market & economic data API (x402, USDC).

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