Billing cadence
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Billing cadence is the frequency at which usage becomes a reportable dollar figure. For every major AI provider, that is daily.
Billing is an accounting system, not telemetry: metering, aggregation, rate-card application and credit reconciliation all sit between your request and a number that survives an invoice dispute.
Consequences: you cannot build a real-time spend alarm from billing data, and a clean chart an hour after a suspected leak proves nothing. Why provider billing APIs are daily.