The machine-readable rate card (the billing contract)

Public tariff: units (Watch, Read), flat opening rates, the free allowance on a self-issued key (25 asks per key for the life of the key since 2026-09-05 — not per day; before states the per-day terms keys issued earlier keep), the money-back guarantee, and the free-key issuance path. The code that enforces allowances reads the SAME object this endpoint serves, so the stated allowance is the enforced allowance by construction. A dated decision history records every rate change.