SpreadEater

SpreadEater is a localized Rust market-making bot purpose-built for Polymarket's liquidity incentive programs. Unlike typical arbitrage bots, it implements a non-directional quoting strategy on binary outcome markets. The bot continuously maintains limit orders on both YES and NO sides, with dynamic spread calculation based on current market volatility and available liquidity. Core strategy relies on collecting the bid-ask spread while remaining delta-neutral — if one side fills significantly, the bot adjusts the other side's pricing to maintain balance. The Rust implementation leverages tokio for async runtime and connects to Polymarket's CLOB API directly. With only 1.3MB, it's minimal and efficient. Key strengths: Rust's performance advantage for low-latency quoting, memory-safe execution for live funds, and local-first design (no cloud dependencies). Weaknesses: zero stars indicates no community validation; documentation is sparse (single README); no backtesting framework included. The strategy is viable for capital-efficient participants who qualify for Polymarket's liquidity rewards programs. Market-making requires significant capital to maintain two-sided quotes and careful risk management during volatile events. This repo is ideal for Rust developers interested in prediction market microstructure. No malware indicators — clean, focused codebase with standard project structure.