Per-Minute Session Billing and Interactive Token Economies
Per-minute billing and one-time payments running against the same account simultaneously is a concurrency problem that general-purpose ledgers don't solve — the discrete payment sees a stale balance and the account overdrafts, or one transaction is silently dropped. CertaCota coordinates both transaction types at the engine level, ensuring every debit is applied against the live running balance without conflict or application-layer retry logic.
Continuous Billing, No Heartbeat Required
Per-minute billing runs as a continuous rate against the account holder's balance — configured at session start as a flat or tiered rate, applied natively by the engine without a heartbeat from the session server or a polling loop from the platform. The balance reflects the running cost at any instant and settles when the session ends, regardless of duration.
Tips Process Without Interrupting the Session Clock
A tip landing during an active per-minute session is a concurrent write against the same balance — the discrete payment must see the balance as it stands at that instant, accounting for the accumulated drain up to that moment. CertaCota serializes both at the transaction coordination layer: no pauses, no rejected transactions, no overdraft window, and no conflict resolution logic required in the platform.
Minutes Remaining, Derived from the Engine
The minutes-remaining countdown shown to account holders during active billing derives from the engine's forward estimation endpoint. The platform queries the projected time-to-zero from the engine's internal session state — no polling loop, no stale cached balance.