Feature
Prepaid Credits
You load a balance before making requests, at a fixed rate of $0.05 to $10 per million tokens depending on the model. There is no subscription tier to pick, no monthly minimum, and the balance simply runs out instead of turning into a surprise invoice.
How it works
Top up any amount
Add credit to your account balance whenever you want. There is no plan tier, no seat count, and no recurring charge tied to the top-up.
Every request debits it
Requests are billed at the model's published per-million-token rate and deducted from the balance the instant a response is returned.
Zero balance, requests stop
When the balance hits zero, new requests return 402 immediately. The amount you loaded is the hard ceiling on what you can spend.
// Balance is checked before every request completes.
const account = await aniron.account.balance();
// { balance_usd: 4.12, low_balance_threshold: 5 }
// Top up any amount, any time. No plan, no minimum.
await aniron.account.topUp({ amount_usd: 20 });Fixed rate per model, published in advance. No surge pricing, no demand-based multiplier.
Prepaid vs. subscription billing
No monthly minimum
A subscription tier charges the same amount whether you use it or not. A prepaid balance only ever decreases when you actually send a request.
Hard spend cap by default
Metered subscription billing lets usage accrue past what you expect, settled at the end of the cycle. A prepaid balance cannot go negative, full stop.
Nothing to cancel
Stop making requests and spend simply stops. There is no plan downgrade path or cancellation flow to navigate.
Same rate at any volume
The per-million-token rate does not change based on how much you have loaded or how fast you spend it, unlike tiered plans that reward volume with opaque discounts.
Frequently asked questions
Is there a subscription or monthly minimum?
No. There is no plan to sign up for and no minimum spend. You add credit to your balance and it is drawn down as you make requests, for as long as it lasts.
What happens when the balance reaches zero?
Requests are rejected with a 402 error before they reach a model. Nothing is billed after the fact, and there is no way to run a negative balance.
Do unused credits expire?
No. A prepaid balance does not expire and does not reset on a monthly cycle. It only decreases when a request is actually made.
How is a request priced against the balance?
Each model publishes a fixed per-million-token input and output rate, from $0.05 to $10 depending on the model. A request is billed at that rate, deducted from the balance, with no surge pricing or demand-based multiplier.
Can different keys draw from different balances?
No, all keys on an account draw from the same prepaid balance. Use per-key budgets to cap how much of that shared balance a given key is allowed to spend.
Continue learning
Try Aniron with $10
Top up once, route a million tokens. See the prepaid model in practice.