dreamDEX

A zero-fee, fully onchain order book exchange

dreamDEX runs spot markets and event contracts on Somnia Markets. The book, the matching and the settlement all run onchain. Makers and takers pay no trading fees, and every trade can be audited onchain.

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Spot volume traded onchain: $120M+; Somnia blog, Sep 1 2026
Of orders placed within 24.4 ms: 95%; Somnia blog, Sep 1 2026
Peak monthly active traders: 10.2K; Somnia blog, Sep 1 2026
All-time spot volume: $145.7M; DefiLlama, Oct 2 2026

The challenge

Order book exchanges usually make traders choose. Centralised venues are fast but hold customer funds and run matching privately. Most onchain venues keep custody with users, but move matching offchain, rely on a central sequencer, or charge taker fees that widen spreads. dreamDEX set out to offer exchange-grade execution with none of those trade-offs.

The approach

dreamDEX uses the Somnia Markets matching engine as a smart contract. Orders rest in an onchain central limit order book, are matched by price-time priority and settle in the same block. Trading fees are zero. Reserve yield from USDso, the venue's quote asset, rewards makers according to how close they quote to the top of the book. Professional and automated traders connect through REST, WebSocket, CCXT, a CLI and MCP-native APIs. Event contracts settle through the Somnia Oracle in USDso.

Highlights

How dreamDEX uses Somnia

Zero maker and taker fees

Neither side of a trade pays a trading fee. Market makers are paid from stablecoin reserve yield, not from a toll on order flow.

Every trade auditable

Order placement, matching and settlement are onchain transactions. Every market rule is published, and any fill can be traced to its transaction hash.

Built for automated traders

REST and WebSocket APIs, CCXT support, a CLI, MCP-native endpoints and an open-source bot kit let algorithmic traders and AI agents trade the same books as people.

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Event contracts on the same engine

BTC and ETH up/down contracts on 15-minute and 1-hour windows trade on the same matching engine as spot and settle in USDso through the Somnia Oracle. They are offered in early access, in permitted jurisdictions only.

Products used