London Fix Month-End Anomaly EA — USDJPY Summer-Only Long Strategy
Expert Advisors
MetaTrader 4
Sales from
9/2/2026
Last Updated At
8/17/2026
Version
1.01
My Profile
SignalWorks- Whole period
- 2 years
- 1 year
- 6 months
- 3 months
- 1 month
Profit
:
4,527JPYProfit Factor
:
4.58Rate of return risk
?
:
4.31Average Profit
:
362JPYAverage Loss
:
-97JPYBalance
?
:
1,004,527JPYRate of return (all periods) ?
:
11.57%Win Rate
:
55.17%
(16/29)
Maximum Position
?
:
6Maximum Drawdown
?
:
2.56%
(1,050JPY)
Maximum Profit
:
699JPYMaximum Loss
:
-200JPYRecommended Margin
?
:
39,131JPYUnrealized P/L
:
0JPYDeposit
?
:
1,000,000JPYCurrency
:
JPY- Account
Operable Brokers
Usable with MT4-adopting brokers.
Forward testing (Profit)
Product Statistics
Product Comments
Monthly Statistics
2026
2025
2024
2023
2022
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Calendar for Months
About EA's Strategy
Translating...
Currency Pairs
[USD/JPY]
Trading Style
[Day Trading]
Maximum Number Position
6
Maximum Lot
1
Chart Time Frame
H1
Maximum Stop Loss
100
Take Profit
100
Straddle Trading
No
Application Type
Metatrader Auto Trading
Other File Usages
No
■ What kind of EA is it
A USDJPY‑only long strategy EA that trades only under the limited conditions of month-end × summer (May to August). It targets periods where the real demand flow based on the London Fix (WMR Fix) used by institutional investors at month-end and the change in Fix times during UK summer time coincide.
Entry direction is long only. No averaging down, Martingale, or hedge trades.
■ Please confirm first: the trading period is limited
• Trading occurs only on the “last few business days of May through August.”
• No trades from September to the following April. About an 8‑month pause is by design, not a malfunction.
• Even within May–August, no trading on days other than month-end.
• It is fine to leave the chart attached and idle. The EA operates normally even during the pause.
Annual average 116 trades concentrated in this short period. Not suitable for someone looking for an “everyday trading EA.”
■ Verification results (TDS 99.9% / Dukascopy tick data / including variable spreads)
・Backtest period: January 2015–August 2026 (11 years)
・Profit Factor: 1.64
・Win rate: 58.9%
・Max drawdown: 1.02%
・Total trades: 1,368 (annual average 118)
・No averaging down, no hedging, fixed stop loss on all positions
Backtests span 11 years without truncation.
■ Demo forward results (transparent disclosure)
Since the end of June 2026, the series 3 currencies have been measured in a demo account (fixed 0.01 lot). The USDJPY version had an attachment omission, starting measurement from the window at end of July 2026.
・End of July 2026 window: 13 trades, 3 wins, 10 losses, -808.6 pips
At the end of July, after the Bank of Japan meeting, rapid yen appreciation hit the month-end long positions, concentrating SLs. All were closed with fixed SL (100 pips). Slippage during rapid moves maxed at 3.6 pips. No loss amplification from averaging down.
We will publish including losing months as is. Forward will be updated at every month-end moving forward.
■ Disclosure policy for the logic
To prevent reverse engineering, specific business days, entry times, and settlement times are not disclosed. Only an overview is provided.
・Active only when both conditions are met: month-end specific business day × specific season (May–August) double filter
・Evening to night JST multiple times with up to 6 positions (1 per time) split-entry
・Next day at a specified time, all positions are forcibly settled (or TP/SL reached)
・European Summer Time (DST) is detected automatically (AutoDST built-in)
■ Honest statement about risk
・The six month-end longs are in the same event and same direction. If rapid yen appreciation occurs near month-end, multiple positions may hit SL at the same time (example at end of July 2026; see forward section above).
・Performance may degrade during sudden policy change phases by the Bank of Japan. In 2025 PF dropped to 1.086 due to normalization, the lowest in 11 years (positive still maintained).
・If currency fluctuations around London Fix decrease, the edge may reduce.
・Backtests and forwards are based on past performance and do not guarantee future profits.
・Always set lot size according to your own risk tolerance.
■ Parameters (only 7 public adjustment items)
| Parameter | Initial value | Description |
|------------|--------|------|
| Lots | 0.01 | Fixed lot size (UseCompounding=false) |
| UseCompounding | false | true = calculate lot by account balance RiskPct% |
| RiskPct | 1.0 | Risk percentage (effective only when UseCompounding=true) |
| MaxSpread | 2.0 | Do not enter if spread exceeds this (pips) |
| Slippage | 3 | Acceptable slippage (pips) |
| MagicNumber | 20260412 | Identifier |
| EnableLogging | true | Log on/off |
■ Recommended operation
・Start with fixed lot (UseCompounding=false, Lots=0.01~)
・UseCompounding=true means RiskPct% per position. This EA can hold up to 6 positions simultaneously, so RiskPct=1.0 corresponds to about 6% total risk per session. If used, RiskPct=0.17–0.2% is recommended.
・Recommended broker conditions: USDJPY average variable spread ≤1.0 pips, server GMT+2/+3 (AutoDST built-in for automatic handling).
■ Summary of specifications
Currency pair: USDJPY only (attaching to other pairs will not launch) / Timeframe: H1
Maximum 6 positions per day, no hedging, no averaging, all positions with fixed SL/TP
※ Trading is at your own risk. It does not guarantee future profits.
Sales from
:
09/02/2026 20:18
Purchased
:
0
times
Price: $162.68 (taxed)
￥25,000(taxed)
Provider/Distributor:
Sales site:
GogoJungle
●Payment
Forward Test
Back Test
Sales from : 09/02/2026 20:18
Purchased
:
0
times
Price: $162.68 (taxed)
￥25,000(taxed)
Provider/Distributor:
Sales site:
GogoJungle
●Payment
About Forex Automated Trading
What is Forex Automated Trading (MT4 EA)?
Forex Automated Trading refers to trading that is automated through programming, incorporating predetermined trading and settlement rules. There are various methods to conduct automated trading, but at GogoJungle, we deal with Experts Advisors (hereinafter referred to as EA) that operate on a trading platform called MT4.
Trading Types of Forex Automated Trading
There are various types of EAs (Expert Advisors) for different trading types that can be used on MT4.
Just like discretionary trading, there are those that decide trading and settlement timings by combining indicators, those that repeatedly buy or sell at certain price (pips) intervals, and trading methods that utilize market anomalies or temporal features. The variety is as rich as the methods in discretionary trading.
To categorize simply,
・Scalping (Type where trades are completed within a few minutes to a few hours),
・Day Trading (Type where trades are completed within several hours to about a day),
・Swing Trading (Type where trades are conducted over a relatively long period of about 1 day to 1 week)
・Grid/Martingale Trading (Holding multiple positions at equal or unequal intervals and settling all once a profit is made. Those that gradually increase the lot number are called Martingale.)
・Anomaly EA (Mid-price trading, early morning scalping)
Just like discretionary trading, there are those that decide trading and settlement timings by combining indicators, those that repeatedly buy or sell at certain price (pips) intervals, and trading methods that utilize market anomalies or temporal features. The variety is as rich as the methods in discretionary trading.
To categorize simply,
・Scalping (Type where trades are completed within a few minutes to a few hours),
・Day Trading (Type where trades are completed within several hours to about a day),
・Swing Trading (Type where trades are conducted over a relatively long period of about 1 day to 1 week)
・Grid/Martingale Trading (Holding multiple positions at equal or unequal intervals and settling all once a profit is made. Those that gradually increase the lot number are called Martingale.)
・Anomaly EA (Mid-price trading, early morning scalping)
Risks, Advantages, and Disadvantages of Forex Automated Trading
When engaging in Forex, there are risks in automated trading just as there are in discretionary trading.
However, a substantial advantage of automated trading is its ability to limit and predict risks beforehand.
[Risk]
Inherent to forex trading are the trading risks that undeniably exist in automated trading as well.
・Lot Size Risk
Increasing the lot size forcibly due to a high winning rate can, in rare instances, depending on the EA, lead to substantial Pips loss when a loss occurs. It is crucial to verify the SL Pips and the number of positions held before operating with an appropriate lot.
・Rapid Market Fluctuation Risk
There are instances where market prices fluctuate rapidly due to index announcements or unforeseen news. System trading does not account for such unpredictable market movements, rendering it incapable of making decisions on whether to settle in advance or abstain from trading. As a countermeasure, utilizing tools that halt the EA based on indicator announcements or the VIX (fear index) is also possible.
[Benefits]
・Operates 24 hours a day
If there is an opportunity, system trading will execute trades on your behalf consistently. It proves to be an extremely convenient tool for those unable to allocate time to trading.
・Trades dispassionately without being swayed by emotions
There is an absence of self-serving rule modifications, a common human tendency, such as increasing the lot size after consecutive losses in discretionary trading or, conversely, hastily securing profits with minimal gains.
・Accessible for beginners
To engage in Forex trading, there is no prerequisite to study; anyone using system trading will achieve the same results.
[Disadvantages]
・Cannot increase trading frequency at will
Since system trading operates based on pre-programmed conditions, depending on the type of EA, it might only execute trades a few times a month.
・Suitability may vary with market conditions
Depending on the trading type of the EA, there are periods more suited to trend trading and periods more suited to contrarian trading, making consistent results across all periods unlikely. While the previous year might have yielded good results, this year's performance might not be as promising, necessitating some level of discretion in determining whether it is an opportune time to operate.
However, a substantial advantage of automated trading is its ability to limit and predict risks beforehand.
[Risk]
Inherent to forex trading are the trading risks that undeniably exist in automated trading as well.
・Lot Size Risk
Increasing the lot size forcibly due to a high winning rate can, in rare instances, depending on the EA, lead to substantial Pips loss when a loss occurs. It is crucial to verify the SL Pips and the number of positions held before operating with an appropriate lot.
・Rapid Market Fluctuation Risk
There are instances where market prices fluctuate rapidly due to index announcements or unforeseen news. System trading does not account for such unpredictable market movements, rendering it incapable of making decisions on whether to settle in advance or abstain from trading. As a countermeasure, utilizing tools that halt the EA based on indicator announcements or the VIX (fear index) is also possible.
[Benefits]
・Operates 24 hours a day
If there is an opportunity, system trading will execute trades on your behalf consistently. It proves to be an extremely convenient tool for those unable to allocate time to trading.
・Trades dispassionately without being swayed by emotions
There is an absence of self-serving rule modifications, a common human tendency, such as increasing the lot size after consecutive losses in discretionary trading or, conversely, hastily securing profits with minimal gains.
・Accessible for beginners
To engage in Forex trading, there is no prerequisite to study; anyone using system trading will achieve the same results.
[Disadvantages]
・Cannot increase trading frequency at will
Since system trading operates based on pre-programmed conditions, depending on the type of EA, it might only execute trades a few times a month.
・Suitability may vary with market conditions
Depending on the trading type of the EA, there are periods more suited to trend trading and periods more suited to contrarian trading, making consistent results across all periods unlikely. While the previous year might have yielded good results, this year's performance might not be as promising, necessitating some level of discretion in determining whether it is an opportune time to operate.
Equipment and Environment Needed for Automated Trading Operation
The requirements for operating automated trading (EA) on MT4 are as follows:
・MT4 (MetaTrader 4. An account needs to be opened with a Forex company that offers MT4.)
・EA (A program for automated trading)
・The operating deposit required to run the EA
・A PC that can run 24 hours or a VPS (Virtual Private Server), where a virtual PC is hosted on a cloud server to run MT4.
・MT4 (MetaTrader 4. An account needs to be opened with a Forex company that offers MT4.)
・EA (A program for automated trading)
・The operating deposit required to run the EA
・A PC that can run 24 hours or a VPS (Virtual Private Server), where a virtual PC is hosted on a cloud server to run MT4.
Installation of MT4 and Account Login
If you open an account with a forex broker that supports MT4, you can use MT4 as provided by that forex broker. MT4 is a stand-alone type of software that needs to be installed on your computer, so you download the program file from the website of the FX company where you opened the account and install it on your computer.
Additionally, there are both demo and real accounts available. You can experience trading with virtual money by applying for a demo account. After opening a real account, you select the connection server assigned by the Forex broker, enter the password, and log in to the account.
When you deposit money into your account using the method specified by the forex broker, the funds will be reflected in your MT4 account, and you can trade.
Additionally, there are both demo and real accounts available. You can experience trading with virtual money by applying for a demo account. After opening a real account, you select the connection server assigned by the Forex broker, enter the password, and log in to the account.
When you deposit money into your account using the method specified by the forex broker, the funds will be reflected in your MT4 account, and you can trade.
How to Install EA on MT4
To set up an EA when you purchase it through GogoJungle, follow the steps below:
Firstly, download the purchased EA file from your My Page on GogoJungle. You will download a zip (compressed) file, so right-click to extract it and retrieve the file named ‘◯◯◯ (EA name)_A19GAw09 (any 8 alphanumeric characters).ex4’ from inside.
Next, launch MT4 and navigate to ‘File’ → ‘Open Data Folder’ → ‘MQL4’ → ‘Experts’ folder, and place the ex4 file inside. Once done, close MT4 and restart it. Then, go to the upper menu ‘Tools’ → ‘Options’, and under ‘Expert Advisors’, ensure ‘Allow automated trading’ and ‘Allow DLL imports’ are checked, then press OK to close.
The necessary currency pair and time frame for the correct operation of the EA are specified on the EA sales page. Refer to this information and open the chart of the correct currency pair time frame (e.g., USDJPY5M for a USD/Yen 5-minute chart).
Within the menu navigator, under ‘Expert Advisors’, you will find the EA file name you placed earlier. Click to select it, then drag & drop it directly onto the chart to load the EA. Alternatively, you can double-click the EA name to load it onto the selected chart.
If ‘Authentication Success’ appears in the upper left of the chart, the authentication has been successful. To operate the EA, you need to keep your PC running 24 hours. Therefore, either disable the automatic sleep function or host MT4 on a VPS and operate the EA.
Firstly, download the purchased EA file from your My Page on GogoJungle. You will download a zip (compressed) file, so right-click to extract it and retrieve the file named ‘◯◯◯ (EA name)_A19GAw09 (any 8 alphanumeric characters).ex4’ from inside.
Next, launch MT4 and navigate to ‘File’ → ‘Open Data Folder’ → ‘MQL4’ → ‘Experts’ folder, and place the ex4 file inside. Once done, close MT4 and restart it. Then, go to the upper menu ‘Tools’ → ‘Options’, and under ‘Expert Advisors’, ensure ‘Allow automated trading’ and ‘Allow DLL imports’ are checked, then press OK to close.
The necessary currency pair and time frame for the correct operation of the EA are specified on the EA sales page. Refer to this information and open the chart of the correct currency pair time frame (e.g., USDJPY5M for a USD/Yen 5-minute chart).
Within the menu navigator, under ‘Expert Advisors’, you will find the EA file name you placed earlier. Click to select it, then drag & drop it directly onto the chart to load the EA. Alternatively, you can double-click the EA name to load it onto the selected chart.
If ‘Authentication Success’ appears in the upper left of the chart, the authentication has been successful. To operate the EA, you need to keep your PC running 24 hours. Therefore, either disable the automatic sleep function or host MT4 on a VPS and operate the EA.
In Case You Want to Change the Account in Use
EAs from GogoJungle can be used with one real account and one demo account per EA.
If you want to use it with an account other than the authenticated one, you need to reset the registered account.
To reset the account, close the MT4 where the Web authentication is registered, then go to My Page on GogoJungle > Use > Digital Contents > the relevant EA > press the ‘Reset’ button for the registration number, and the registered account will be released.
When the account is in a reset state, using the EA with another MT4 account will register a new account.
Also, you can reset the account an unlimited number of times.
If you want to use it with an account other than the authenticated one, you need to reset the registered account.
To reset the account, close the MT4 where the Web authentication is registered, then go to My Page on GogoJungle > Use > Digital Contents > the relevant EA > press the ‘Reset’ button for the registration number, and the registered account will be released.
When the account is in a reset state, using the EA with another MT4 account will register a new account.
Also, you can reset the account an unlimited number of times.
Solutions for Errors During Web Authentication or Non-Functional Account Trading
If you encounter an error with Web authentication, or if the EA is trading on GogoJungle's forward performance page but not on your own account, there could be various reasons. For more details, please refer to the following link:
→ Items to Check When EA is Not Operating
→ Items to Check When EA is Not Operating
About the Size of Trading Lots
In Forex trading, the size of a lot is usually:
1 lot = 100,000 currency units
0.1 lot = 10,000 currency units
0.01 lot = 1,000 currency units
For USD/JPY, 1 lot would mean holding 100,000 dollars.
The margin required to hold lots is determined by the leverage set by the Forex broker.
If the leverage is 25 times, the margin required to hold 10,000 currency units of USD/JPY would be:
10000*109 (※ at a rate of 109 yen per dollar) ÷ 25 = 43,600 yen.
1 lot = 100,000 currency units
0.1 lot = 10,000 currency units
0.01 lot = 1,000 currency units
For USD/JPY, 1 lot would mean holding 100,000 dollars.
The margin required to hold lots is determined by the leverage set by the Forex broker.
If the leverage is 25 times, the margin required to hold 10,000 currency units of USD/JPY would be:
10000*109 (※ at a rate of 109 yen per dollar) ÷ 25 = 43,600 yen.
Glossary of Automated Trading
・Profit Factor: Total Profit ÷ Total Loss
・Risk-Return Ratio: Total Profit and Loss during the period ÷ Maximum Drawdown
・Maximum Drawdown: The largest unrealized loss during the operation period
・Maximum Position Number: This is the maximum number of positions that the EA can theoretically hold at the same time
・TP (Take Profit): The set profit-taking Pips (or specified amount, etc.) in the EA's settings
・SL (Stop Loss): The set maximum loss pips (or specified amount, etc.) in the EA's settings
・Trailing Stop: Instead of settling at a specified Pips, once a certain profit is made, the settlement SL is raised at a certain interval (towards the profit), maximizing the profit. It is a method of settlement.
・Risk-Reward Ratio (Payoff Ratio): Average Profit ÷ Average Loss
・Hedging: Holding both buy and sell positions simultaneously (Some FX companies also have types where hedging is not allowed)
・Risk-Return Ratio: Total Profit and Loss during the period ÷ Maximum Drawdown
・Maximum Drawdown: The largest unrealized loss during the operation period
・Maximum Position Number: This is the maximum number of positions that the EA can theoretically hold at the same time
・TP (Take Profit): The set profit-taking Pips (or specified amount, etc.) in the EA's settings
・SL (Stop Loss): The set maximum loss pips (or specified amount, etc.) in the EA's settings
・Trailing Stop: Instead of settling at a specified Pips, once a certain profit is made, the settlement SL is raised at a certain interval (towards the profit), maximizing the profit. It is a method of settlement.
・Risk-Reward Ratio (Payoff Ratio): Average Profit ÷ Average Loss
・Hedging: Holding both buy and sell positions simultaneously (Some FX companies also have types where hedging is not allowed)
Useful related pages
・How to Install MT4 EA (Expert Advisor) and Indicators
・MT4 Beginner's Guide
・Understanding System Trading Performance (Forward and Backtesting)
・Choosing Your First EA! Calculating Recommended Margin for EAs
・Comparing MT4 Accounts Based on Spread, Swap, and Execution Speed
・What is Web Authentication?
・Checklist for When Your EA Isn't Working
・MT4 Beginner's Guide
・Understanding System Trading Performance (Forward and Backtesting)
・Choosing Your First EA! Calculating Recommended Margin for EAs
・Comparing MT4 Accounts Based on Spread, Swap, and Execution Speed
・What is Web Authentication?
・Checklist for When Your EA Isn't Working