Every model,
under list.
One API key for Claude, GPT, Gemini and 460+ more. Credits bought under list price, spent token by token.
Buy credits under list.
Pick an amount. The quote fills from the cheapest offers on the book and shows every line before you pay.
1 credit = $1 of usage at the model's list price.
- From $5 to $2,000
- per card purchase
- 5% platform fee
- on face value, on the receipt
- Card, Apple Pay, Google Pay
- through our checkout partner
- On your balance
- as soon as the payment clears
Same answer. Smaller bill.
Pick a prompt and a model. The answer is a saved one, replayed; the list price is the model's live price on OpenRouter.
The demo replays a stored answer: no model is called.
The discount is a book.
Credits are listed at set discounts under list price. Your order takes the cheapest first; whatever the book can't fill is sold at list price, never above.
467 models. Priced live.
List prices load live from OpenRouter. The underlist column applies the net rate of a $100 top-up on the demo book, card fee included.
Called by their usual ids. The model you name is the model that runs.
Four steps. No contract.
- 01
Top up
From $5 by card. Your order fills from the cheapest offers on the book, and the receipt shows every line first.
- 02
Take one key
One key for every model. Rotate or revoke it whenever you like: your balance never moves.
- 03
Swap two lines
The base URL and the key. OpenAI and OpenRouter SDKs, streaming and tool calls carry on as they are.
- 04
Pay per token
Every call is charged at the model's real cost, from your credits. No plan, no seat, no monthly fee.
Cheaper. Not different.
A lower price only matters if nothing else changes. Four rules we hold to on every call.
- 01The model you name runs.No swap, no silent fallback. Responses keep the provider's own id, so every call is checkable.
- 02Your prompts stay yours.Zero-data-retention routing only. We keep model, tokens, cost and latency. Never what you wrote.
- 03Every price is public.List prices load live from OpenRouter, the book is open, and the receipt shows each slice and fee.
- 04Never above list.When the book runs out, the rest is sold at list price. You never pay more than at the source.
Two lines. That's it.
Point your client at underlist and swap the key. Model names, streaming and tool calls keep working as they are.
Base URL
https://api.undrlst.com/v1
API key example
sk-smaaart-7f3a9c2e1b…
Every token, on the record.
Your balance, spend by day and by model, and the latency our gateway adds. Shown here with a sample account.