Billing & credits

Workspaces are prepaid: you top up a credit balance, usage draws it down per request, and at zero the API returns a 402; there is no overage billing.

Topping up

Top-ups are by card, $5 to $5,000, with a processing fee of 2.9% + $0.30 itemized at checkout; the fee never comes out of your balance. The card is saved (one per workspace) for one-click top-ups and auto top-up; payment details are handled by Stripe and are not stored by Keln.

Auto top-up

Set a threshold and an amount on the Billing page: when the balance falls below the threshold, the amount is charged to the saved card. It won't fire again until the previous charge has credited, and a declined charge triggers an email.

Invoices and receipts

Every top-up gets a numbered receipt (TOP-YYYY-NNNN) by email, and an invoice PDF is available per payment once your billing details are filled in. Keln also emails when the balance drops to $5, when credits are depleted, and when an auto top-up fails.

Billing details

Your name and address, and for a business its tax id; invoices render from these details.

Who can change billing

Billing is owner-only: top-ups, the card, auto top-up, and billing details. Admins see the page read-only (Teams).

The fine print

Credits are closed-loop (they pay for Keln usage) and never expire. Refunds are handled by support and can only cover unspent credits. A request that fails on Keln's side bills nothing; a generation you cancel bills what was delivered. Credits and refunds are governed by the Terms of Service. No tax is added at checkout.