How to Test an EA on a Demo Account Before Going Live
Every broker behaves differently. Spreads spike at different hours, fills vary, and what works on one broker can bleed on another. This is the exact process to validate your gold EA on your specific broker — before a single cent of real money is at risk.
Run each set file for at least 3 full trading days on your broker's demo. Export the MT5 report. Feed it to an LLM. Ask it which hours had the cleanest fills and lowest spread. Then configure your EA to trade only those hours.
The 6-Step Process
Receive Your EA + Set Files
When you purchase any Pro-Scalper EA, you receive the .ex5 expert advisor file and a folder of set files — pre-configured input presets, each representing a different trading style.
Open a Demo Account on Your Broker
This is the most critical rule: your demo account must be on the exact same broker you intend to trade live. Demo accounts on a different broker are useless for this process — they tell you nothing about the spreads, liquidity, or execution speed you will actually experience.
Broker A might offer 0.1 pip spread on XAUUSD during London hours. Broker B might offer 0.8 pip spread at the exact same time. An EA that is profitable on Broker A can be a consistent loser on Broker B — purely because of spread. This is why you must test on your broker.
Load Each Set File — Run for 3+ Days
Attach the EA to XAUUSD on your demo account and load the set file via the EA inputs panel. Then leave it running for a minimum of 3 full trading days — do not interfere.
How to load a set file in MT5
Export the MT5 Strategy Report
After 3+ days, export the full trade history from MT5. This report is what you will feed to the LLM in the next step.
How to export the report
Feed the Report to an LLM
This is the step most traders skip — and it is the most powerful. An LLM can scan your entire trade history in seconds, group trades by hour, calculate win rate and average P&L per time window, and tell you exactly which hours your EA performed best on your specific broker.
Why each broker is different
Spread on XAUUSD is not fixed — it changes dramatically by hour. The chart below shows a typical spread pattern. Your broker may differ significantly. The only way to know is to measure it directly with your own demo data.
* Indicative pattern only. Your broker's actual spread profile will vary — hence the need to measure it yourself.
Which LLM to use
Paste report as text or upload CSV
Excellent at table & pattern analysis
Upload HTML report directly
The exact prompt to use
Copy this prompt, paste your MT5 report data below it, and send it to your chosen LLM:
I have attached my MT5 trading report (3 days of demo trades on XAUUSD). Please analyse the data and tell me: 1. Which hours (UTC) had the best win rate and lowest spread? 2. Which hours should I avoid due to high spread or poor fills? 3. What time filter should I set in my EA settings for this broker? Broker: [your broker name] EA: [EA name]
Apply the Best Hours & Go Live
Take the LLM's recommendation and update the EA's time filter inputs before switching to a live account. Every Pro-Scalper EA has StartHour and EndHour inputs in the settings panel.
You have tested the EA on your specific broker, collected real spread data, and tuned the time filter to avoid the worst hours. This is exactly how professional EA traders validate a new setup — and it takes less than a week to complete.
Frequently Asked Questions
How long should I run the EA on demo before going live?
Minimum 3 trading days per set file. This captures at least one full week cycle of broker spread patterns — including the tighter London/NY overlap sessions and the wider rollover window at 22:00 UTC.
Does the demo account need to be with the same broker I will trade live?
Yes — this is critical. Every broker has different spreads, execution speeds, and liquidity at different hours. A demo on Broker A tells you nothing useful about Broker B. Always test on the exact broker you plan to trade live.
What format should I export the MT5 report in?
Export as HTML from MT5 (right-click the account history → Save as Report). You can then open it in a browser and copy-paste the trade table into the LLM, or use a browser extension to export as CSV for easier analysis.
Can I use all three set files at the same time on one demo?
No — run one set file at a time so the results stay clean. Open a separate demo account for each set file if you want to test them simultaneously.
What if the LLM says avoid a session my EA is configured for?
Adjust the EA's StartHour and EndHour inputs to exclude that window. Each Pro-Scalper EA has these settings exposed in the inputs panel so you can dial in your broker's optimal hours.
Is three days of data enough for the LLM analysis?
It's enough to identify obvious spread spikes (especially the rollover window and Asian session). For a deeper pattern you can run 5–7 days. The goal is not a full backtest — it's finding broker-specific hours to avoid.
Ready to test your EA?
Every Pro-Scalper EA comes with multiple set files, full documentation, and direct support to help you get through the demo validation process and onto a live account with confidence.