Public platform statistics

Aggregate corpus, universe, on-chain and derived-layer counts. FREE and unauthenticated: one of two /v1 routes priced at zero credits, which is what lets the public site show live numbers without an x402 challenge. Aggregates only: nothing per-asset, per-address or per-user, and ingest sources are reported as coarse classes rather than named. records is the exact sum of every row-counting field in the response; it is null, never short, when any contributing read failed. Same rule for metrics, narratives, stories, revisions, graded_creators, holder_rows, relationships_tested and metric_rows: null means the read did not answer, not that we hold none.