o2 Exchange

o2 Exchange is a fully decentralized, high-performance trading platform built on the Fuel blockchain. Designed from the ground up to leverage Fuel's execution model, o2 provides institutional-grade trading infrastructure while maintaining complete user sovereignty over assets.

The platform represents a paradigm shift in decentralized exchange architecture, combining the efficiency of centralized order books with the security guarantees of on-chain settlement. Unlike traditional AMM-based DEXs, o2 implements a central limit order book (CLOB) directly on-chain, enabling sophisticated trading strategies while eliminating counterparty risk.

Platform Architecture Overview

The o2 Exchange is composed of:

• Sway Contracts: OnChain components that deliver all main functionality, from user access to order matching, most components work in a permissionless way.
• Data Layer: OffChain indexer, that indexes the pre-confirmation receipts, from the transactions executed on the contracts, and distributes rich data via REST and Websocket APIs.
• Executor Layer: This component forwards user actions to the Fuel Network, sponsoring gas for on-demand transactions. It does not apply any logic for batching or prioritizing transactions.
• User Interface Layer: The set of tools / UIs that facilitates the interaction with the other components.

graph TB
    subgraph "User Interface Layer"
        Web["Web Trading Interface"]
        API["HTTP/WebSocket APIs"]
        CLI["Developer CLI"]
    end

    subgraph "Service Layer"
        subgraph "Read-Only"
            REST["REST API"]
            WS["WebSocket Service"]
        end
        subgraph "Executor"
            Sponsor["Gas Sponsor"]
            Upgrade["Order Book Create/Upgrade"]
        end
        subgraph "Data Indexer"
            Indexer["Event Indexer"]
        end
    end

    subgraph "Blockchain Layer"
        subgraph "Discovery logic"
            REG["Order Book Registry"]
            TREG["Trading Account Registry"]
        end

        subgraph "Proxy Contracts"
            TAP["Trading Account Proxy"]
            OBP["Order Book Proxy"]
        end

        subgraph "Core Logic"
            TA["Trading Accounts"]
            OB["Order Books"]
            Oracle["Upgrade Oracle"]
        end
    end

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