King Arb Gold Euro

King Arb Gold Euro v2.27 · Gold-Euro Statistical Arbitrage (Unlimited Build + Full Source)

King Arb is a market-neutral statistical-arbitrage EA for gold (XAUUSD) and the euro (EURUSD). It does not predict direction. It builds an equal-weight USD common factor from gold, silver and the euro, removes that factor to isolate each instrument's idiosyncratic residual, and trades the mean-reversion of the cumulative residual gap (zres_XAU minus zres_EUR) on M15. Silver only feeds the factor and is never traded, which keeps trading costs low. Gold and the euro are held together as a hedged two-leg spread: the EA enters when the residual gap is stretched (long one leg, short the other) and exits as the gap reverts.

How this build differs from the MQL5 Market build

• Unlimited activations, no account binding, no licence key — the Market build is capped at 5 activations
• Full MQL5 source included (653 lines, English comments) — the Market build ships binary-only
• $399 — the same EA is $599 on the MQL5 Market
• The .ex5 in the archive was compiled from the .mq5 in the same archive (Result: 0 errors, 0 warnings) — recompile it yourself to verify
• Trading logic is identical to v2.27 — we only added our store header. No input name, default value or trading behaviour was changed.

Core mechanics

• Equal-dollar hedge — both legs carry identical USD notional, removing the translation leak (the residual reverts yet the hedged spread still loses) that undermines lagged-beta hedging
• Volatility-target sizing — size is scaled down automatically in high-volatility regimes (de-leverage only), compressing drawdown while preserving return
• Regime gates — a gold/USD-index directional de-risk plus a euro-leg regime gate cut exposure on the side a prevailing trend presses against
• Institutional-grade execution — atomic two-leg entry with automatic rollback if one leg fails, magic-number restart recovery, free-margin pre-check, session check and spread filter

Published backtest (verifiable on the MQL5 product page)

Tickmill MT5, every tick based on real ticks (model 4), 10,000 USD, 2025.01 to 2026.06, commission (6 USD per lot round-turn) and real spreads included:

• Net profit +166.5% · Profit factor 1.37 · Sharpe 5.12 · Win rate 58.9% · Trades 1,388

This is a single 1.5-year sample that contains one historic anti-USD move. Past performance does not guarantee future results. Always re-run the test on your own broker's data before going live.

Requirements

• Hedging account required — the strategy holds both legs at once
• Attach once, to an XAUUSD M15 chart
• Market Watch must show, with history: XAUUSD, XAGUSD, EURUSD and the USD-index basket (EURUSD, GBPUSD, AUDUSD, NZDUSD, USDJPY, USDCAD, USDCHF)
• If your broker uses a suffix (e.g. XAUUSD.m), adjust InpXAU / InpXAG / InpEUR
• LotsXAU is the single leverage knob — about 0.10 per 10,000 USD, scaled linearly. Everything else ships pre-optimized; do not change the Signal group.
• A VPS is recommended for 24/5 uptime

What's in the download

• USDFactorResidualArb.ex5 — ready-to-run unlimited build
• USDFactorResidualArb.mq5 — full MQL5 source
• README.txt — compile steps, requirements and risk notes (EN/ZH)

Risk warning

This strategy's edge is regime-dependent: strongest in anti-USD / rising-gold regimes, weaker in a sustained strong-dollar regime. Leveraged trading carries a high risk of losing your entire capital. Trade only with money you can afford to lose, start at the minimum lot, and forward-test on a demo account for one to two months first. Nothing on this page is investment advice.