It compiles cleanly without warnings or errors in the AmiBroker Formula Editor.

AFL (AmiBroker Formula Language) is deceptively simple to write. However, writing code that runs is one thing; writing code that is mathematically sound, logically consistent, and free of “look-ahead bias” is another. This article dives deep into why verification is essential, how to audit AFL code like a professional, and where to find (or create) robust verified strategies.

// Parameters Length = Param("MA Length", 20, 1, 100, 1);

Repainting occurs when a signal depends on the current bar's high/low/close but is evaluated before the bar closes in real time.

: No missing semicolons, unmatched brackets, or misspelled reserved words Logic is Valid

A 200-line AFL with Buy = Cross(CCI(20), -100) and Sell = Cross(100, CCI(20)) . “Verified” response: “No errors – backtest runs.” Reality: The code repaints because CCI uses future bars if SetBacktestMode() is missing. The verifier never checked for repainting.

Since “AFL Code Verified” is not a single, official product but rather a service offered by third-party developers (e.g., on Upwork, eBay, or trading forums), this review evaluates the of paying for such verification.

. Ensuring your code is verified is the first step toward building a reliable quantitative system. 1. What is Verified AFL Code?

and are ready for execution in charting, backtesting, or automated trading

What are you seeing on your chart?

// Strategy Parameters period = Param("RSI Period", 14, 2, 50, 1 ); buyLevel = Param("Buy Threshold", 30, 1, 50, 1 );

When plotting shapes (Buy/Sell arrows), Amibroker often minimizes redundant signals (e.g., if you are in a trade for 10 bars, it shows one arrow at the start). To verify that your logic is triggering every single bar the condition is true (useful for debugging volatility or stop-losses), use _NOROBOTS .

Are you planning to use this code for or live automated trading ? Share public link