Trade perps from the same balance.
Up to 40× on BTC, ETH, SOL and 180+ markets, routed to Hyperliquid's order book. One USDC balance, no bridge, no seed phrase — and every fee itemised before you confirm.
How it works
Three steps. Your balance never leaves OpenSea custody until an order fills.
Approve the builder fee
A one‑time signature sets the maximum OpenSea can add per order: 5 bps. It reads like a fee disclosure because it is one — and you can revoke it on the same screen.
Margin from your balance
Move USDC into perps margin from the balance you already hold. Apple Pay, card and crypto all land in the same place.
Long or short, itemised
Market, limit, stop and take‑profit orders. The ticket shows Hyperliquid's fee, OpenSea's fee and your liquidation price live as you change size or leverage.
The fee, in plain language.
OpenSea adds a builder fee of 5 basis points to each perps order — $5 on a $10,000 trade — stacked on Hyperliquid's own 0.015% maker / 0.045% taker fees. It is shown on every ticket, approved once by signature, and revocable at any time from Settings.
That's it. No spread, no hidden markup, no custody of your positions.
Questions
Where do my orders actually go?
To Hyperliquid's onchain order book. OpenSea is the interface and attaches a builder code to each order; Hyperliquid matches, settles and holds the position.
What am I signing?
One ApproveBuilderFee message that caps the fee OpenSea can add at 5 bps. It is not a trading permission and it can be revoked from the same screen at any time.
What does OpenSea earn?
Only the builder fee, accrued onchain to OpenSea's builder address. There is no spread, no separate settlement with Hyperliquid, and no custody.
Is this live?
No — this site is a working concept demo. Marks random‑walk in your browser, orders fill instantly against a simulated book, and nothing touches a wallet or Hyperliquid.