Your whole organisation shares a single credit balance, shown at the top of Billing. Every call draws it down; every top-up and plan credit builds it back up. There are no invoices to reconcile for usage and no surprise bills — if the money isn't in the balance, the call doesn't happen.
One balance, one rate
Each minute of calling has one all-in price that covers everything — the AI model, the voice, and the telephony. There are no separate meters for tokens, speech or phone time. The rate depends on your plan: the same rate applies whether the minutes come from a plan's included credit or a top-up.
Calls are billed in 6-second increments, so a 30-second call costs half a minute's rate, not a whole minute's.
Every movement — usage, top-ups, plan credits, refunds — appears in the Ledger tab on Billing, with a running balance after each entry. That's where the real money lives; the Usage page shows volumes, not charges.
Top up your balance
The button is on the page header and on the Credit balance card.
Choose from the preset amounts (£25 to £250). The modal shows the credit, VAT at 20% and the total before you commit.
Payment is a card form secured by Stripe. Your balance updates as soon as Stripe confirms the payment — usually within a few seconds.
Saved cards live under Payment methods on the same page, where you can add a card without charging it, remove one, or mark one as the default.
Auto top-up
Rather than watching the balance, let it refill itself. The Auto top-up card on Billing has a toggle and two amounts: When balance below and Top up by. When enabled and the balance dips under your threshold, your default card is charged automatically for the top-up amount.
Auto top-up isn't instant, so give the threshold a little headroom above zero if your call volume is bursty. Pay-as-you-go accounts get it pre-configured at signup — see Choosing how you pay.
Low balance and the hard stop
Keep an eye on the balance at the top of Billing if your volumes are climbing. If it reaches zero, calls stop — agents stop answering new calls until credit arrives. Calling resumes once credit is back in the balance, whether that's a top-up or a plan renewal.
That's the whole model: prepaid with a hard stop. You can never owe us money.
Nothing else is touched when credit runs out. Your agents, numbers, knowledge, call history and settings all stay exactly as they were, and the dashboard remains fully usable — you can keep building and editing agents, and top up or change plan whenever you're ready.
Credit that rolls over
Unused credit rolls over into the next month, capped at one month's credit — so a quiet month isn't wasted, but credit can't pile up indefinitely. How the monthly plan credit is granted in the first place is covered in Plans.