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Wixzel Voice is prepaid. You add credit, calls spend it per second, and you cannot be billed for more than you put in.

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Adding credit

Dashboard → Billing → Add credit. Pick an amount, pay, and the balance moves when the payment settles — usually within seconds.
Returning from checkout is not the same as the credit landing. Payment is confirmed by the provider calling us back, not by your browser coming home, so the dashboard waits for that rather than claiming success early.
From the API, with billing:write:
The response carries a checkout_url. Send the customer there; the balance moves on settlement. Minimum 5,maximum5, maximum 10,000 per top-up — the floor stops dust payments costing more in fees than they add, the ceiling is a fat-finger guard rather than a limit on what you may spend. Idempotency-Key is required here. See Idempotency.

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What a call costs

Roughly 0.04–0.04–0.15 per minute, depending on the engine — see Voice engines for the per-engine table. That covers speech recognition, the model, speech synthesis, and a flat $0.012 per connected minute of orchestration. It does not include telephony. You bring your own SIP trunk, so your carrier bills you directly and we do not mark it up.

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Reading the balance

held_micros is credit reserved by calls in progress. available_micros is what a new call can draw on.

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Micro-USD

Amounts are integer micro-USD: 1,000,000 = 1.00.Voiceusageisbilledpersecond,pertokenandpercharacter,andachargeof1.00. Voice usage is billed per second, per token and per character, and a charge of 0.000021 has no float-dollar representation that agrees with the ledger. Responses carry a *_display string alongside the integer so nothing has to do currency arithmetic in JavaScript.

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Running out

Credit is reserved before a call is placed. An account that cannot fund the first 15 seconds is refused with 402 insufficient_credits at admission — before a port is opened or a provider socket is created. You are not charged for a call that never happened. Mid-call, at roughly a minute of remaining runway, the agent speaks a warning to your caller. At zero it speaks a closing line and hangs up. It does not drop the line mid-sentence.
A new account has a $0.50 credit limit. This is not free trial credit — it is a grace margin so a call is never killed by a rounding race between the meter and the ledger. Do not budget against it.

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Tracing a charge

Every micro debited is explained by a usage row, so a bill is answerable without asking support:
Prices are frozen per call: a call is priced when it is admitted and finishes on those rates, so a price change can never move a meter mid-conversation. If our own process crashes mid-call you are charged for the seconds we can prove, not the amount that was reserved.