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Forex EAs & MT5 backtesting, without the fantasy
Every EA you will ever consider comes with a beautiful backtest. Almost none of them come with the two things that make a backtest mean anything: the assumptions it was built on, and the source code that produced it.
This cluster is the paper trail. It covers what a backtest can and cannot tell you, how one equity curve hides a distribution of luck, how AI-optimized results overfit, and what changes between a test and a live account. The through-line: evidence you can re-run beats a screenshot every time.
If you only read one thing, start with the backtest field manual below. If you only run one thing, resample your own system ten thousand times and look at the spread.
Start here
Backtest Isn't Reality.
18 min read
Monte Carlo simulator →
resample an equity curve in your browser
MTR — the EA with full MT5 source →
$49 one-time, modelled backtest disclosed line by line
Evolution Lab →
the backtest-hardening toolkit
The core reading
Backtest Isn't Reality.
A backtest is not proof. It is a crime scene. Here's how a systematic trader inspects one before risking real money.
Monte Carlo Backtesting: One Trading System, 10,000 Simulated Paths
We took the 24 real walk-forward months behind our own EA's published backtest and resampled them into 10,000 alternative years — same system, same months, reshuffled. The honest range runs from losing 43% to making 124×, the median year spends time 46% underwater, and a quarter of the winning years started out losing. Every number below is reproducible from a script in our repo.
AI Backtest Overfitting: How to Audit a Perfect Result Before You Trust It
Describe a strategy to AI, or let an EA/indicator generator optimize it, and you'll get a gorgeous equity curve in minutes. You didn't find an edge — you ran a search. And a big enough search always finds a winner, even when there's nothing there.
EA Backtest vs Live Results: The Gap Is the Tell.
EA backtest vs live results — the live account always runs a little worse, and every honest quant knows why. Here's the arithmetic of the gap, what's normal, what's a red flag, and how to use it to read any seller in twenty minutes.
Where results quietly die
The Spread Tax.
The price on your chart is one number. The price you trade is two — and the gap is where small edges quietly die.
One Lucky Hand.
A backtest shows one ordering of your trades. Deal the same cards again and the drawdown can double. Here's the top-quant trick that shows you the real risk — and you can run it today.
Everyone Was a Gold Genius.
For fourteen months gold went one way, and every long-biased EA on earth looked brilliant. Then the January high broke. Four months into the giveback, here's the difference between an edge and a tide — and the 20-minute audit that tells you which one you actually bought.
Do EAs work at all?
Do Forex EAs Actually Work?
Are forex EAs worth it? The honest answer from a team that sells one — the regulator numbers nobody quotes, the four ways trading robots die, the marketplace-rating trap, and the 20-minute test that separates a tool from a slot machine.
The Grid Cliff.
Is a grid trading EA safe? It prints money in neat steps for months. Then one trend shows you what the staircase was built over.