Fees
What Purrbook charges today
Nothing on trades.Purrbook’s builder fee is not active yet. The builder account has to hold a minimum balance before Hyperliquid will accept fee-carrying orders, and until that is funded and probed the fee is switched off in the app. Orders you place today carry no Purrbook fee of any kind.
This page will be updated when that changes. The rates below are what will apply when it does — they are published now so the change is never a surprise.
The builder fee, when it activates
The rate depends on which market you trade, because Hyperliquid caps it differently per market type.
| Market | Purrbook fee | Protocol cap |
|---|---|---|
| Outcome markets | 0.30% | 1.00% |
| Spot | 0.30% | 1.00% |
| Everything else | 0.10% | 0.10% |
On outcome and spot markets the fee accrues on the sell side— opening a position costs no Purrbook fee, and a position held all the way to settlement pays none either, because settlement is an automatic conversion rather than a sale into the book. On other markets the fee applies to the trade itself rather than only the exit.
You approve the fee once, from your own wallet, during onboarding. Purrbook cannot raise it after the fact without you approving again.
Hyperliquid’s protocol fees
Separate from anything Purrbook charges. For outcome markets Hyperliquid currently sets its own fee to zero. That is the protocol’s setting, not ours, and it can change on their side without warning. Other markets carry Hyperliquid’s standard trading fees.
Deposits and withdrawals
Purrbook adds no withdrawal fee. Network and bridge costs to move USDC depend on the route you pick, and are shown before you confirm.
Funding through the in-app deposit rail is the one place a cost applies today. Paying by card costs whatever the payment provider charges, and nothing on top. Funding from crypto you already hold carries a 0.30% provider fee plus a 0.70% Purrbook fee. Connecting a wallet you already have and depositing to Hyperliquid directly avoids both.
Why we publish this before charging it
The whole point of an order book is that nobody sets the price against you. A fee you find out about at the moment you exit would undo that. Cash Out & Settlement covers what a sale actually does, and Non-Custodial & Safety covers why we could not take more than the fee you approved even if we wanted to.