MT4 / MQ4
Expert Advisor
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Expert Advisor
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SAW system 1
SAW system 1 is a MetaTrader 4 Expert Advisor source file. Static analysis documents Martingale or Lot Recovery, 9 exposed input declarations, and 0…
Free MQL4 and MQL5 Source Code Downloads
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.
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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.
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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.
Free MQL Source Code Library
Browse free MQ4, MQ5, and MQL source downloads
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.
2,015 live resources
1,151 MT4 / MQ4
864 MT5 / MQ5
1,151 MT4 / MQ4
864 MT5 / MQ5
29 matching source pages
Claim limit: 3 distinct free resources per account day
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MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
STORM
STORM is a MetaTrader 4 Expert Advisor source file. Static analysis documents Custom Indicator, Martingale or Lot Recovery, 12 exposed input declarations, and 0…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
10pipsOnceADayOppositeLastNHourTrend
10pipsOnceADayOppositeLastNHourTrend is a MetaTrader 4 Expert Advisor source file. Static analysis documents Martingale or Lot Recovery, Trend, Trailing Stop, 16 exposed input declarations, and…
MT4 / MQ4
Indicator
Compile not run
Indicator
Compile not run
VR Calculate Martingale Lite
VR Calculate Martingale Lite is a MetaTrader 4 Indicator source file. Static analysis documents Martingale or Lot Recovery, Trend, 2 exposed input declarations, and…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
20pipsOnceADayOppositeLastNHourTrend
20pipsOnceADayOppositeLastNHourTrend is a MetaTrader 4 Expert Advisor source file. Static analysis documents Martingale or Lot Recovery, Trend, Trailing Stop, 0 exposed input declarations, and…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
mrMartinGale Update1
mrMartinGale Update1 is a MetaTrader 4 Expert Advisor source file. Static analysis documents RSI, Martingale or Lot Recovery, 6 exposed input declarations, and 0…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
6xIndics M
6xIndics M is a MetaTrader 4 Expert Advisor source file. Static analysis documents Stochastic, Martingale or Lot Recovery, Trailing Stop, 22 exposed input declarations,…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
Pure Martingale
Pure Martingale is a MetaTrader 4 Expert Advisor source file. Static analysis documents Martingale or Lot Recovery, Risk or Lot Sizing, 25 exposed input…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
mrMartinGale
mrMartinGale is a MetaTrader 4 Expert Advisor source file. Static analysis documents RSI, Martingale or Lot Recovery, 5 exposed input declarations, and 0 include…
MT4 / MQ4
Indicator
Compile not run
Indicator
Compile not run
Equity Monitor
Equity Monitor is a MetaTrader 4 Indicator source file. Static analysis documents Martingale or Lot Recovery, File Access, 33 exposed input declarations, and 0…
MT4 / MQ4
Indicator
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Indicator
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Equity v8
Equity v8 is a MetaTrader 4 Indicator source file. Static analysis documents Martingale or Lot Recovery, Risk or Lot Sizing, File Access, 12 exposed…
MT4 / MQ4
Expert Advisor
Missing dependencies
Expert Advisor
Missing dependencies
Zig dan Zag Danu Ultimate Investment Long Term
Zig dan Zag Danu Ultimate Investment Long Term is a MetaTrader 4 Expert Advisor source file. Static analysis documents Custom Indicator, Martingale or Lot…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
Coin Flip
Coin Flip is a MetaTrader 4 Expert Advisor source file. Static analysis documents Martingale or Lot Recovery, Trailing Stop, Risk or Lot Sizing, 14…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
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Undular V1.3
Undular V1.3 is a MetaTrader 4 Expert Advisor source file. Static analysis documents Moving Average, Stochastic, Martingale or Lot Recovery, 27 exposed input declarations,…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
Master MM Droid
Master MM Droid is a MetaTrader 4 Expert Advisor source file. Static analysis documents RSI, Martingale or Lot Recovery, 5 exposed input declarations, and…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
AutoPendingByRSI
AutoPendingByRSI is a MetaTrader 4 Expert Advisor source file. Static analysis documents RSI, Martingale or Lot Recovery, File Access, 24 exposed input declarations, and…
MT4 / MQ4
Expert Advisor
Missing dependencies
Expert Advisor
Missing dependencies
RobotiADXProfitwining
RobotiADXProfitwining is a MetaTrader 4 Expert Advisor source file. Static analysis documents ADX, Martingale or Lot Recovery, Hedging, 42 exposed input declarations, and 3…
MT5 / MQ5
Indicator
Compile not run
Indicator
Compile not run
Woodiescci
Woodiescci is a MetaTrader 5 Indicator source file. Static analysis documents CCI, Trend, 6 exposed input declarations, and 0 include dependencies.Source-code analysis only. No…
MT5 / MQ5
Indicator
Compile not run
Indicator
Compile not run
Ozymandias Htf Signal
Ozymandias Htf Signal is a MetaTrader 5 Indicator source file. Static analysis documents Custom Indicator, Trend, 19 exposed input declarations, and 0 include dependencies.Source-code…
MT5 / MQ5
Indicator
Compile not run
Indicator
Compile not run
Forexprofitboost 2nb Htf Signal
Forexprofitboost 2nb Htf Signal is a MetaTrader 5 Indicator source file. Static analysis documents Custom Indicator, Trend, 23 exposed input declarations, and 0 include…
MT5 / MQ5
Indicator
Compile not run
Indicator
Compile not run
Beginner Htf Signal
Beginner Htf Signal is a MetaTrader 5 Indicator source file. Static analysis documents Custom Indicator, Trend, 19 exposed input declarations, and 0 include dependencies.Source-code…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
Trend Catcher
Trend Catcher is a MetaTrader 4 Expert Advisor source file. Static analysis documents Moving Average, Parabolic SAR, Martingale or Lot Recovery, 23 exposed input…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
Knux Martingale
Knux Martingale is a MetaTrader 4 Expert Advisor source file. Static analysis documents ADX, CCI, Martingale or Lot Recovery, 48 exposed input declarations, and…
MT4 / MQ4
Expert Advisor
Compile not run
Expert Advisor
Compile not run
Trend Catcher v2
Trend Catcher v2 is a MetaTrader 4 Expert Advisor source file. Static analysis documents Moving Average, Parabolic SAR, Martingale or Lot Recovery, 31 exposed…