Extended: The Order-Book Perp DEX, Reviewed
Extended reviewed: the perpetuals DEX with an order-book, exchange-style experience while staying self-custodial. How it works, the risks, and who it's for.
Table of contents
Serious perp traders often want a real order book, limit orders, and tight spreads, not a pool-based approximation. Extended delivers that: a perpetuals DEX with an order-book, centralized-exchange-style experience, while keeping you self-custodial. Trade leveraged perps from your own wallet against a central-limit order book. Here is how it works and the risks.
What is Extended?
Extended is a perpetuals DEX offering an order-book, centralized-exchange-style trading experience while remaining self-custodial. You trade leveraged perps from your own wallet against a central-limit order book rather than a liquidity pool. That gives limit-order control and, on liquid pairs, tighter spreads than a pool-based design.
The order-book model is the differentiator. Where many perp DEXs price against a pool, Extended lets makers post bids and asks and takers fill them, the professional trading structure, without a custodian holding your funds.
How Extended works
- Connect a self-custody wallet and fund your trading account.
- Open positions against the order book, long or short, using limit or market orders at your chosen leverage.
- Manage the trade. Funding is exchanged between longs and shorts; liquidation triggers if margin falls too low.
- Close or withdraw at any time; collateral stays under your control.
Why traders use Extended
- Real order book. Limit orders and tighter spreads on liquid pairs.
- Exchange-like experience. Professional trading structure onchain.
- Self-custody. Trade from your own wallet, no custodian.
- Maker/taker dynamics. Post liquidity or take it, as on a real exchange.
When to reach for something else: for the deepest overall perp liquidity, Hyperliquid; for pooled oracle perps, GMX. Extended is the pick when you want an order-book perp experience onchain.
Risks
Perps are high-risk: leverage magnifies losses, liquidations are fast, and funding accrues. Order-book liquidity varies by pair, thin books mean wider spreads and slippage on market orders, so check depth before sizing up. Smart-contract risk applies. Verify the official URL, use small size and low leverage, and never trade more than you can lose.
How to get started
- Open the app and connect a self-custody wallet.
- Fund your trading account and check order-book depth on your pair.
- Place a limit or market order at low leverage, reviewing liquidation and funding.
- Start small to learn the interface before sizing up.
Final verdict
Extended brings the order book to onchain perps. A central-limit order-book experience with limit orders and tighter spreads, self-custodial, gives active traders the professional structure they want without a custodian. The risks are the category's: fast liquidations, funding, and pair-by-pair liquidity, so check depth and manage leverage. For an order-book perp DEX with self-custody, Extended is worth a look. Verify the URL and start small.
For the full landscape, see our best perpetual DEXs guide.
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Frequently asked questions
What is Extended?
Extended is a perpetuals DEX offering an order-book, centralized-exchange-style trading experience while remaining self-custodial. You trade leveraged perps from your own wallet against a central-limit order book rather than a pool.
How is Extended different from a pool-based perp DEX?
Pool-based perp DEXs price trades against a liquidity pool. Extended uses an order book, where makers post bids and asks and takers fill them, closer to a centralized exchange, with limit orders and tighter spreads on liquid pairs, while you keep custody.
Is Extended safe?
Extended is non-custodial. The risk is trading: leveraged perps liquidate fast and funding applies, plus smart-contract risk. Order-book liquidity varies by pair. Verify the official URL, check depth on your pair, and start small.
Who is Extended for?
Extended suits active perp traders who want an order-book, exchange-like experience without giving up self-custody. For pooled oracle perps or the deepest single-venue liquidity, other venues may fit better; Extended is the pick when you want an order book onchain.