Not for trading. Placing an order, cancelling one and being liquidated all cost zero gas. You pay maker or taker fees on fills and nothing for the transactions themselves.
Why an order book can’t work otherwise
Market makers quote continuously and cancel constantly — most orders a serious market maker places never fill. On a chain that charges per action, that’s unaffordable, so market makers don’t come, and without them there’s no book.
Every on-chain venue that charges gas per order ends up as something other than an order book, usually a pool.
Where gas does apply
HyperEVM — the smart contract layer — charges gas in HYPE for contract interactions. That’s separate from trading. You need HYPE for gas only when using HyperEVM applications, not for placing orders on the exchange.
Bridging in costs the source chain’s gas. Withdrawing costs a flat 1 USDC.
What you still pay
Trading fees on fills, tiered by rolling volume. Hourly funding when holding across the hour. Those are the real costs, and they dwarf anything gas would have been.