Nexus — Cross-DEX Arbitrage & Mempool Sniper
High-Frequency Automated Trading & Threat Mitigation Engine
Nexus is a low-latency financial market execution agent designed for decentralized exchanges. It ingests pending mempool transactions via custom WebSocket RPC nodes, calculates real-time price discrepancies across automated market makers (AMMs), and submits atomic bundle transactions via Flashbots to capture arbitrage spread with zero risk of capital loss on failed legs.
System Architecture
Key Design PrimitivesSolidity smart contract that verifies price output invariants on-chain before executing swaps, reverting atomically if target spread is not met.
Custom async engine parsing pending transaction calldata at over 1,000 tx/sec with sub-millisecond JSON-RPC decoding.
Direct integration with private MEV builder relays ensuring trade orders bypass the public mempool completely.
Engineering Bottlenecks
Public mempool trading exposes orders to predatory MEV bots, sandwich attacks, and toxic order flow, leading to high slippage and frontrunning.
Architectural Solution
Architected a Rust & Python asynchronous pipeline utilizing private RPC relays, custom EVM simulation smart contracts for atomic multi-hop swaps, and pre-trade invariant checks that simulate state changes locally before submitting transactions.
Key Business & Technical Outcomes
Technology Stack
Selected for maximum throughput, type safety, and zero-maintenance reliability.
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