Top-ups and rollover
How your USD balance is spent, why it never expires, and how plan allowance rolls over.
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Top-ups add dollars to your account's USD balance without changing your plan's included allowance. Value is spent in one order: your plan's included allowance, including any rollover from earlier periods, then the USD balance, then the one-time starter grant.
The USD balance
Your USD balance never expires. It is not tied to the plan you were on when you added it: a cancellation or plan change does not freeze it, hold it, or reset its value. Usage beyond your included allowance draws from the balance at your current plan's top-up rate for the resource it uses — bandwidth or search credits — so the same dollars buy more on a plan with a lower rate. The bandwidth and credit amounts shown beside your balance are estimates at those current rates; the dollar figure is what you hold.
Bandwidth you owe
A request is billed on the bandwidth it actually used, which can turn out larger than the amount set aside when it started. Bandwidth beyond what your allowance, USD balance and starter grant can cover is recorded as bandwidth you owe, not waived, and the amount appears under Dashboard → Settings → Billing. Your next top-up, billing-period renewal or plan upgrade pays it off before anything else, oldest first, and only what is left over becomes spendable. A top-up first brings any USD balance below zero back up to zero, so a small one may not reach what you owe; on a plan whose top-up rate is zero, only a renewal or plan upgrade can pay it off. While you owe anything, including a USD balance that a refund or dispute took below zero, new billable requests are refused with 402 quota_exceeded, even if you still have allowance left. Requests already in progress finish and are billed as usual.
Billing-period rollover
Unused bandwidth from your monthly plan allowance rolls over to the next billing period with no cap, for as long as the subscription stays on its plan or moves to a higher one. A downgrade or cancellation freezes it: the frozen balance stops being spendable, and resubscribing at the same tier or higher within 90 days restores it in full — after that it is permanently lost. The USD balance is separate from the billing period, so it is not reset when that period rolls over.
Credits do not roll over — they reset every billing period. This does not affect your USD balance, which never expires.
Your USD balance and rollover balances appear under Dashboard → Settings → Billing.