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Flatkey uses a prepaid balance model — you add credit to your account and it is consumed as your API requests use models. There are no subscriptions or recurring charges. Every top-up earns bonus credit, credited instantly to your balance.

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Top-up tiers

The $200 top-up tier offers the best effective rate. Combined with model discounts (60–90% of official list), this brings costs to as low as 50% of official provider pricing.

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Adding a top-up

1

Open Balance

In the console, click Balance in the left sidebar.
2

Select a top-up amount

Choose 10,10, 20, or $200. The bonus credit is displayed before you confirm.
3

Complete payment

Enter your card details and confirm. Payment is processed via Stripe. The credit (including bonus) is added to your balance immediately.

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How bonus credit works

  • Instant credit: Bonus credit appears in your balance as soon as payment is processed.
  • Never expires: Bonus credit and paid credit both remain in your balance indefinitely — there is no expiry date.
  • Spends like normal credit: Bonus credit is consumed the same way as paid credit. There is no restriction on which models it can be used for.
  • Stacks every time: Each top-up earns a new bonus. Top up 200threetimesandearn200 three times and earn 300 in bonus credit total.

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Balance management

Your balance is displayed in the Balance section of the console. You can:
  • View the breakdown between paid credit and bonus credit
  • See the history of all top-up transactions with dates and amounts
  • Enable low-balance email alerts from Settings → Notifications

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What happens when balance runs out

If your balance drops to $0.00, API requests will return a 401 Insufficient Balance error until you top up. There are no automatic charges or overdraft — your requests simply stop until you add more credit.
For production workloads, set up a low-balance alert to ensure you top up before the balance is fully consumed. Go to Settings → Notifications to configure the threshold.

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Enterprise billing

For teams that need invoice-based billing, custom monthly volumes, or procurement support, contact support@flatkey.ai to discuss enterprise terms. Enterprise accounts do not require prepaid top-ups.