Stratified median indices (base May 2025 = 100). JSON · point-in-time via ?as_of=YYYY-MM. Preliminary — values may revise as late registrations land; see revision policy.
Cadence: the warehouse is refreshed daily and every derived figure is recomputed and integrity-gated before it is published — nothing goes live on a failed check. Grades are re-issued as the registry settles; the index publishes a preliminary reading that firms up as late registrations arrive.
Published rules: methodology · editorial independence & revision policy · enterprise API · coverage.