Monitoring DEX–CEX Price Spreads with Concurrent Order Book Requests

Summary

This document describes a monitoring system for price differences between decentralized and centralized exchanges. It groups configured venues by exchange type, normalizes symbol names that vary across platforms, loads market precision, and requests order book depth concurrently through REST interfaces. For each selected asset, it pairs each DEX with each CEX and compares top-of-book bid and ask prices, displaying the two directional spreads and available top-level quantities.

The examples cover spot and perpetual markets across named venues, with BTC and ETH as common instruments. The implementation is a monitoring tool rather than a trading strategy: it identifies potential hedge opportunities but does not place paired orders or determine whether a spread remains profitable after fees, execution costs, latency, and market impact. The article proposes adding threshold alerts, cost calculations, trading logic, and WebSocket data as future extensions. Its spread snapshots therefore serve as an initial screening aid, not evidence of executable arbitrage returns.

Key ideas

• The system pairs every configured DEX with every configured CEX to monitor cross-venue spreads.
• Concurrent REST requests collect order book depth for selected symbols.
• Exchange-specific symbol corrections and market precision support comparable quotes.
• Top-of-book prices and quantities are reported in both spread directions.
• The monitor does not account for trading costs or execute hedged trades, so observed gaps are not proof of arbitrage profits.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.