Is the B123 MQL source code library free?

Yes. The source-code product pages are public and the source packages can be claimed through a registered B123 account with private zero-total order delivery and daily claim limits.

Do I receive editable MQ4 or MQ5 files?

The free-source products provide editable MQL derivatives when available, with page-level notes for platform, source format, dependencies, compile status, and detected code structure.

Why do some files show compile_failed or dependency_missing?

Some legacy MQL files require missing include files, unavailable custom indicators, older MetaEditor syntax, or manual platform-specific changes. Diagnostic labels are shown before download.

Can B123 fix, convert, or review a source file?

B123 can use the diagnostic label and dependency notes as a starting point for a support conversation, but no repair, conversion, trading result, or live-account outcome is guaranteed.

Free MQL4 & MQL5 Source Code Downloads

Q: What if I need a ready-to-use EA instead of source code?

Use the paid BBTrading paths when you want packaged tools, setup notes, private delivery, and available backtest evidence instead of editing or compiling raw source code yourself.

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.

Free MetaTrader source libraries

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.

Free MT4 EA downloads for MetaTrader 4 Expert Advisor discovery and installation.
Free MT5 EA downloads for MetaTrader 5 Expert Advisor discovery and installation.
Free MT4 indicator downloads for editable MT4 indicator resources.
Free MT5 indicator downloads for MetaTrader 5 indicator resources.
Free MT4 EA source code with MQ4 structure and diagnostic evidence.
Free MT5 EA source code with MQ5 structure and diagnostic evidence.
Free MT4 indicator source code with buffers, inputs, and dependency notes.
Free MT5 indicator source code with MQ5 event and plot analysis.

How resources qualify for the public library

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.

What each product page documents

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.

Private download access

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.

Need a ready-to-use EA instead of source code?

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.

Want this source checked or fixed?

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.

Questions

Are these MQL files free to download?

Yes. A registered account is required so WooCommerce can grant a private zero-total order permission and enforce the daily quota.

Does a compile pass mean an EA is profitable?

No. Compilation checks code and dependencies only. It is not a backtest, live result, or profitability verification.

Why might a source file fail to compile?

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.

Can the source code be modified?

The downloadable MQ4 and MQ5 derivatives are editable, but every modification requires independent review, compilation, and demo testing.

Are functional API addresses removed?

No. Detected runtime endpoints are preserved when replacement could break WebRequest, licensing, news, or other executable network behavior.

2,015 matching source pages
Claim limit: 3 distinct free resources per account day
Need ready-to-use EAs?

MT4 / MQ4
Indicator
Compile not run

mv i TAACH 2 0

mv i TAACH 2 0 is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 24 exposed…

2d7a73a97bcc
View source page

MT4 / MQ4
Indicator
Compile not run

Pivotpoints

Pivotpoints is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 18 exposed input declarations, and 0…

2cb958cdead6
View source page

MT4 / MQ4
Indicator
Compile not run

WilliamsB

WilliamsB is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 25 exposed input declarations, and 0…

2bc5b1056c85
View source page

MT4 / MQ4
Indicator
Compile not run

rvmFractalsLevel

rvmFractalsLevel is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 3 exposed input declarations, and 0…

2b7ab9aef41d
View source page

MT4 / MQ4
Indicator
Compile not run

MultiZigZag

MultiZigZag is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 11 exposed input declarations, and 0…

2aef460599ed
View source page

MT4 / MQ4
Indicator
Compile not run

Accumulation 1.2 divergence

Accumulation 1.2 divergence is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 21 exposed input declarations,…

28c3c03388b6
View source page

MT4 / MQ4
Indicator
Compile not run

CCI With Arrow

CCI With Arrow is a MetaTrader 4 Indicator source file. Static analysis documents CCI, 9 exposed input declarations, and 0 include dependencies.Source-code analysis only….

27341d75b123
View source page

MT4 / MQ4
Indicator
Compile not run

Divergence

Divergence is a MetaTrader 4 Indicator source file. Static analysis documents MACD, 6 exposed input declarations, and 0 include dependencies.Source-code analysis only. No backtest…

26d2e833ccce
View source page

MT4 / MQ4
Indicator
Compile not run

Price Channel Central

Price Channel Central is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 1 exposed input declaration,…

257470917690
View source page

MT4 / MQ4
Indicator
Compile not run

Zigzagdb

Zigzagdb is a MetaTrader 4 Indicator source file. Static analysis documents Trend, 3 exposed input declarations, and 0 include dependencies.Source-code analysis only. No backtest…

24b860e5f503
View source page

MT4 / MQ4
Indicator
Compile not run

Color Fill MA

Color Fill MA is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 19 exposed input declarations,…

2415928a1855
View source page

MT4 / MQ4
Indicator
Compile not run

AIS1AI

AIS1AI is a MetaTrader 4 Indicator source file. Static analysis documents Trend, 31 exposed input declarations, and 0 include dependencies.Source-code analysis only. No backtest…

23301da77041
View source page

MT4 / MQ4
Indicator
Compile not run

Figurelli Pivot Indicator

Figurelli Pivot Indicator is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 0 exposed input declarations,…

22f1c6b4460a
View source page

MT4 / MQ4
Indicator
Compile not run

Ichimokusuppresmtf Ad

Ichimokusuppresmtf Ad is a MetaTrader 4 Indicator source file. Static analysis documents Ichimoku, Trend, 30 exposed input declarations, and 0 include dependencies.Source-code analysis only….

22e4365e0ced
View source page

MT4 / MQ4
Indicator
Compile not run

Percent Change MICEX

Percent Change MICEX is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 3 exposed input declarations,…

21eeb6f5e537
View source page

MT4 / MQ4
Indicator
Compile not run

Degree Angles Zero Indicator

Degree Angles Zero Indicator is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 26 exposed input…

20e103e727e2
View source page

MT4 / MQ4
Indicator
Compile not run

Waddah Attar Pivot Fibo Second

Waddah Attar Pivot Fibo Second is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 0 exposed…

207ff40c4dd3
View source page

MT4 / MQ4
Indicator
Compile not run

DeMark Trendline Trader

DeMark Trendline Trader is a MetaTrader 4 Indicator source file. Static analysis documents Trend, 13 exposed input declarations, and 0 include dependencies.Source-code analysis only….

204049db7742
View source page

MT4 / MQ4
Indicator
Compile not run

Extrapolator

Extrapolator is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 8 exposed input declarations, and 0…

20277082909b
View source page

MT4 / MQ4
Indicator
Compile not run

Stoch Divergence

Stoch Divergence is a MetaTrader 4 Indicator source file. Static analysis documents Stochastic, 9 exposed input declarations, and 0 include dependencies.Source-code analysis only. No…

1fb127583b37
View source page

MT4 / MQ4
Indicator
Compile not run

lukas1 7eqxqqqy0nald6 3cpdduuac2 Alert v28

lukas1 7eqxqqqy0nald6 3cpdduuac2 Alert v28 is a MetaTrader 4 Indicator source file. Static analysis documents its declared MQL event and resource structure, 6 exposed…

1f23a96fa641
View source page

MT4 / MQ4
Indicator
Missing dependencies

SultonovPrediction 3

SultonovPrediction 3 is a MetaTrader 4 Indicator source file. Static analysis documents Trend, 13 exposed input declarations, and 2 include dependencies.Source-code analysis only. No…

1e40b7506fa6
View source page

MT4 / MQ4
Indicator
Compile not run

MACD nrp mtf

MACD nrp mtf is a MetaTrader 4 Indicator source file. Static analysis documents Moving Average, Custom Indicator, 5 exposed input declarations, and 0 include…

1d1d5d02919b
View source page

MT4 / MQ4
Indicator
Compile not run

ind DivPeakTroughSto SW v1

ind DivPeakTroughSto SW v1 is a MetaTrader 4 Indicator source file. Static analysis documents Stochastic, 16 exposed input declarations, and 0 include dependencies.Source-code analysis…

1c4d427316a2
View source page

Free MQL4 and MQL5 Source Code Downloads

Free MetaTrader source libraries

How resources qualify for the public library

What each product page documents

Private download access

Need a ready-to-use EA instead of source code?

Want this source checked or fixed?

Questions

Are these MQL files free to download?

Does a compile pass mean an EA is profitable?

Why might a source file fail to compile?

Can the source code be modified?

Are functional API addresses removed?

Browse free MQ4, MQ5, and MQL source downloads

MQL4/MQL5 products with private delivery.

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