Designing a Fully On-Chain Trading System: Lessons from SSS

Most decentralized exchanges today are built on AMM models. While AMMs solve liquidity bootstrapping, they are not ideal for high-performance trading. In this article, we explore a different approach: designing a fully on-chain trading system. Key Design Problem The core challenge is: How do you achieve CEX-level UX while remaining fully on-chain? This requires solving three constraints: Latency Execution precision State consistency Internal Ledger Design Instead of relying on external token balances, SSS introduces an internal ledger. Benefits: Instant balance updates No per-transaction gas friction Simplified accounting This allows the system to behave more like a centralized exchange internally. Execution Model SSS does not use AMM curves. Instead, it implements: Orderbook-style logic Limit orders Partial fills This enables: Precise pricing Reduced slippage Better trading control ACK vs Finalized One key innovation is separating: ACK (fast response ~0.15s) Finalized (on-chain settle