DEV Community

KlevAi Quantitative Research
KlevAi Quantitative Research

Posted on Originally published at klevai.co.uk

Engineering Notes: MT5 Server Forensics: How Prop Firms Detect EAs via ORDER_REASON_EXPERT

#algotrading #python #fintech #trading

Canonical Source Notice: This technical brief is a condensed summary of our full research paper originally published at https://www.klevai.co.uk/blog/how-prop-firms-detect-ea-magic-numbers-order-reason-expert-vs-client.

Problem Statement: how prop firms detect expert advisors mt5

Traders buy 'Stealth EAs' that set MagicNumber=0 and clear order comments, unaware that the MT5 terminal kernel hardcodes ORDER_REASON_EXPERT at the C++ protocol level whenever OrderSend() is invoked by an .ex5 script.

Inside the MetaQuotes Manager API: why disguising an MQL5 bot's Magic Number as '0' still fails prop firm audits—and why native OS hardware mouse clicks pass every forensic inspection.

Telemetry & Architecture Benchmark

When engineering our 5-Agent Quantitative War Room for Spot Gold (XAUUSD), we benchmarked standard retail/EA execution against native OS hardware execution:

Forensic Inspection Field Standard Commercial EA 'Stealth' MQL5 Bot (Magic=0) KlevAi Zero-EA Hardware Clicker
MT5 Kernel ENUM_ORDER_REASON ORDER_REASON_EXPERT (Instant Flag) ORDER_REASON_EXPERT (Still Flagged!) ORDER_REASON_CLIENT (100% Manual Flag)
Expert ID (Magic Number) Shared Vendor Integer 0 (Spoofed) 0 (Genuine Client GUI Ticket)
Order Dispatch Timing Jitter Exact 1ms–5ms Tick Sync Fixed Sleep() Delay Randomized 1.5s–8.0s Human Curve

Architectural Implementation

Eliminating .ex5 execution scripts completely. KlevAi's Local Companion operates outside the terminal process, driving physical OS cursor movements and One-Click Trading clicks so the MT5 kernel natively stamps ORDER_REASON_CLIENT.

  1. Pre-Trade Risk Sentinel: Enforces a hard -3.8% daily equity circuit breaker well inside the standard -5.0% prop firm daily drawdown limit.
  2. 50/50 Twin-Order Scaling: Splits every 0.06L setup into 0.03L (TP1 at +60 pips) and 0.03L (Runner ratcheted to Breakeven + 5 pips).
  3. Zero-EA Native GUI Clicker: Dispatches OS-level mouse and keyboard events (ORDER_REASON_CLIENT) with randomized human timing jitter.

🔗 Full Paper & Interactive XAUUSD Drawdown Calculator

Explore the complete 2,000-word breakdown and run the interactive JavaScript lot-size & drawdown buffer calculator on the canonical research page:

Top comments (0)