Browse free MQL source code for MetaTrader 4 and MetaTrader 5 through the B123 Quant library. The collections separate Expert Advisors from indicators and general download intent from editable MQ4 or MQ5 source-code intent, so traders can reach the most relevant platform and resource type quickly.
Source-code analysis only. No backtest or live-performance claim is provided.
Use the general download collections to compare available resources, installation steps, platform compatibility, account access, and private delivery. Use the source-code collections when you want editable files, detected inputs, event handlers, dependencies, diagnostic status, and code-specific risk notes.
Original files remain immutable. A published derivative is created separately, non-runtime author URLs and contact details are replaced with the B123 site URL, and functional WebRequest or runtime API endpoints are preserved when changing them would alter behavior. Exact duplicates consolidate into one canonical family rather than creating repeated search pages.
Diagnostic status is shown so users know what may need work. A source can be marked compile passed, compile failed, dependency missing, legacy source, or compile not run. Compilation confirms only syntax and available dependencies in one isolated environment; it never proves trading performance or live-account suitability.
Each family page identifies the platform, resource type, source format, detected handlers and components, exposed inputs, dependencies, sanitization status, compilation result, installation workflow, and operational risks supported by static evidence. Pages do not invent profit, drawdown, win rate, broker, symbol, timeframe, prop-firm, or non-repainting claims.
Product pages and collection pages are public, while source packages use registered WooCommerce accounts and private download permissions. Each account may claim three distinct free-source products per site day. Each granted permission allows three download attempts and expires after 30 days. Raw ZIP paths, account pages, and private delivery endpoints are not search landing pages.
Free source is useful for study and testing, but it may require compilation, missing includes, syntax changes, broker-specific setup, or risk review. Traders who do not want to edit code can compare paid BBTrading products with clearer setup notes, private delivery, and available backtest evidence. Paid products are separate from this free library and should be evaluated on their own product evidence and risk notes.
If a file does not compile or you are unsure how to install it, use the diagnostic label and dependency list when contacting B123. A support conversation can identify whether the problem is a missing include, old MQL syntax, platform mismatch, or configuration issue. No repair or live-trading outcome is guaranteed.
Yes. A registered account is required so WooCommerce can grant a private zero-total order permission and enforce the daily quota.
No. Compilation checks code and dependencies only. It is not a backtest, live result, or profitability verification.
Common causes include missing MQH dependencies, old language syntax, unavailable custom indicators, or differences between MetaEditor builds. The product page shows the known diagnostic status before download.
The downloadable MQ4 and MQ5 derivatives are editable, but every modification requires independent review, compilation, and demo testing.
No. Detected runtime endpoints are preserved when replacement could break WebRequest, licensing, news, or other executable network behavior.
Free MQL Source Code Library
Use the library to find free MetaTrader source-code pages with diagnostic labels, account-based private delivery, and paths to ready-to-use BBTrading products.
Fibonacciretracement is a MetaTrader 5 Expert Advisor source file. Static analysis documents Custom Indicator, Trend, 10 exposed input declarations, and 1 include dependency.Source-code analysis…
TEST SignalDeltaZZ is a MetaTrader 5 Expert Advisor source file. Static analysis documents Trend, Risk or Lot Sizing, 16 exposed input declarations, and 4…
Backtothefuture is a MetaTrader 5 Expert Advisor source file. Static analysis documents Trend, WebRequest, 17 exposed input declarations, and 1 include dependency.Source-code analysis only….
Expm Sidus is a MetaTrader 5 Expert Advisor source file. Static analysis documents Risk or Lot Sizing, 22 exposed input declarations, and 4 include…
Estoplevelinfo is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 0 exposed input declarations, and 0…
Efi Indicator is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 4 exposed input declarations, and…
Autonk V2 is a MetaTrader 5 Indicator source file. Static analysis documents its declared MQL event and resource structure, 4 exposed input declarations, and…
Ard Buy is a MetaTrader 4 Expert Advisor source file. Static analysis documents its declared MQL event and resource structure, 1 exposed input declaration,…
ZZFiboTrader is a MetaTrader 5 Expert Advisor source file. Static analysis documents Custom Indicator, Breakout, Trend, 14 exposed input declarations, and 0 include dependencies.Source-code…
Sartrailingsystem is a MetaTrader 5 Expert Advisor source file. Static analysis documents Trend, 5 exposed input declarations, and 0 include dependencies.Source-code analysis only. No…
Exp Tema is a MetaTrader 5 Expert Advisor source file. Static analysis documents its declared MQL event and resource structure, 96 exposed input declarations,…
Strategytesterpracticetrade is a MetaTrader 5 Expert Advisor source file. Static analysis documents Risk or Lot Sizing, File Access, 1 exposed input declaration, and 0…
Amabb is a MetaTrader 5 Indicator source file. Static analysis documents its declared MQL event and resource structure, 6 exposed input declarations, and 0…
