Extended Review 2026: Self-Custodial Perp DEX on Starknet

Extended is a perpetual futures exchange on Starknet. It lets users trade leveraged contracts on crypto and tokenized traditional assets while keeping custody of their funds. Collateral and settlement are in USDC.

Third-party write-ups say it was built by engineers with backgrounds at Revolut, Goldman Sachs and Lykke, and that it aims to bring a centralized-exchange feel to on-chain trading. They cite up to 100x leverage, sub-10ms latency, and a fee model with zero maker fees.

The product has changed over time. Writers describe a move from StarkEx to the public Starknet network, an incentive points program that started in 2025, tokenized vault shares, and a roadmap for unified margin, lending and borrowing, equities exposure and a spot market. The homepage itself publishes little text, so the team, audits and legal structure are not stated there.

A perpetual future is a contract that tracks an asset's price without an expiry date. Traders post collateral, here USDC, and open long or short positions with leverage. Funding payments between the two sides keep the contract price close to the underlying price, and positions are liquidated if losses approach the collateral posted.

Extended describes a hybrid design. Order matching uses a central limit order book for speed, while settlement and custody sit on Starknet, a zero-knowledge rollup that posts proofs to Ethereum. Third-party write-ups say prices come from oracles and that the exchange moved from the StarkEx stack to the public Starknet network.

Accounts use one margin pool across crypto and tokenized traditional assets such as commodities. A roadmap described by outside writers would extend this into unified margin with borrowing, equities exposure and a spot market. Those items are plans, so check what is live in the app.

Third-party write-ups report a fee schedule of 0% for makers and 0.025% for the other side, which appears to be the taker rate. One source also mentions fee discounts linked to referral sign-ups and a league system that returns extra yield to active traders. The exact current schedule is set in the app.

Perpetual futures carry other costs that the sources do not quantify: funding payments between longs and shorts, spread and slippage on thinner markets, liquidation penalties, and network or bridging costs when moving funds into Starknet. Check the fee and funding details in the trading interface before opening a position.

Extended is described as self-custodial, so deposits are held in on-chain accounts and not by a central operator. That reduces exchange custody risk, but not smart-contract risk, oracle risk or the risk of liquidation. Audits, bug bounties and team details are not published on the homepage, so check the project's documentation for them before depositing.

Regulatory status is not stated. Leveraged derivatives are restricted or prohibited in some jurisdictions, so confirm what is allowed where you live. Trading with up to 100x leverage is high risk and only suits people who can afford to lose their deposit. You must be 18 or older, and if trading stops being controlled, seek responsible trading support.

Extended is for active, experienced derivatives traders who are comfortable with wallets, bridging to Starknet and liquidation risk. It also suits people who want crypto, commodities and other tokenized assets in one margin account. It is not aimed at beginners or anyone who cannot afford to lose their collateral.