x402 market intelligence time series: how many services/resources are listed per category (Agentic.Market taxonomy) or in total (CDP Bazaar ~23k resources, Agentic.Market ~1.5k services), sampled ~3x/day by our collector since 2026-07-06. Query category=Data|Inference|Search|... or category=all for catalog totals, days=1-30 window. Deterministic reads from our archived observation history; no upstream calls at request time. Free snapshot: /v1/market-pulse.