Custom EA Lot-Size Specification: Fixed Lots, Risk Percent or Balance Scaling?
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PMotive High-Intent Buyer & Activation Guide · Custom EA Specification · Updated August 2026
Custom EA Lot-Size Specification: Fixed Lots, Risk Percent or Balance Scaling?
Direct answer: Choose the sizing model before development begins. Fixed lots are simple, percentage-risk sizing adapts to account equity, and balance-scaling rules need exact caps, rounding and broker-volume handling. The developer should not guess which behaviour you meant.
Already researching this before you buy or scale?
Watch PMotive videos related to this buyer question
- TikTok: How to Code a Forex Expert Advisor
- YouTube: Bullymax Pro Gold EA Trade Entry and Exit Demonstration
- TikTok: Comment EA to Start Learning
These links demonstrate product use, setup or historical examples. Open them in a new tab, then return to this guide and the official PMotive page for current product requirements.
Why this question matters before checkout
People searching for custom EA lot size specification are usually much closer to a decision than someone searching a broad phrase such as “what is forex trading.” The remaining risk is often operational: a broker specification, platform permission, account rule, test-quality issue or unclear workflow can determine whether the product is suitable for the buyer's actual environment.
PMotive Custom EA Development is most relevant for traders who already have a rule-based strategy and need the specification translated into testable MT4/MT5 automation. That does not mean every account, broker or trader should use the same settings. A strong purchase decision separates software fit from risk choice: the product can be compatible while the trader's sizing or deployment plan is still unsuitable.
Five checks to complete
| Check | What to inspect | Why it matters |
|---|---|---|
| Rule definition | Write the exact trigger, calculation and edge case in plain language. | Ambiguous specifications create expensive revisions. |
| Broker/platform constraints | State MT4/MT5, symbols, digits, lot rules and any required indicators. | The code must match the execution environment. |
| Failure behaviour | Define what happens when data, connection or order placement fails. | Risk controls need an explicit fallback. |
| Testing evidence | List the test cases that prove the feature works. | Acceptance should be objective. |
| Handover/ownership | Confirm the files, documentation, licence and support scope included. | Commercial expectations should be agreed before coding. |
Work through the issue in this order
1. Rule definition
Write the exact trigger, calculation and edge case in plain language. This matters because ambiguous specifications create expensive revisions. Do not change unrelated settings until this check is completed and documented. For a high-intent buyer, the goal is to know whether the issue belongs to the broker/account environment, the platform configuration or the trading product itself.
2. Broker/platform constraints
State MT4/MT5, symbols, digits, lot rules and any required indicators. This matters because the code must match the execution environment. Do not change unrelated settings until this check is completed and documented. For a high-intent buyer, the goal is to know whether the issue belongs to the broker/account environment, the platform configuration or the trading product itself.
3. Failure behaviour
Define what happens when data, connection or order placement fails. This matters because risk controls need an explicit fallback. Do not change unrelated settings until this check is completed and documented. For a high-intent buyer, the goal is to know whether the issue belongs to the broker/account environment, the platform configuration or the trading product itself.
4. Testing evidence
List the test cases that prove the feature works. This matters because acceptance should be objective. Do not change unrelated settings until this check is completed and documented. For a high-intent buyer, the goal is to know whether the issue belongs to the broker/account environment, the platform configuration or the trading product itself.
5. Handover/ownership
Confirm the files, documentation, licence and support scope included. This matters because commercial expectations should be agreed before coding. Do not change unrelated settings until this check is completed and documented. For a high-intent buyer, the goal is to know whether the issue belongs to the broker/account environment, the platform configuration or the trading product itself.
Buyer decision: what should be true before you proceed?
Before spending money or increasing live exposure, you should be able to answer four questions clearly: Is the product compatible with my platform and market? Do I understand the broker/account rules that affect execution? Have I tested the exact configuration I intend to use? Is the maximum loss acceptable even if the next sequence of trades loses?
If one of those answers is unclear, the next step is not a larger deposit or a more aggressive preset. Use the official PMotive product page, the linked social demonstrations and support channels to close the information gap first. This reduces impulse decisions and makes the article useful to both new buyers and existing customers troubleshooting a specific setup.
Common mistakes that create unnecessary losses or support problems
- Using screenshots instead of exact rules.
- Leaving edge cases for the developer to guess.
- Changing the specification after coding without updating acceptance criteria.
- Approving a build without testing the specific failure cases.
A recurring pattern in automated trading is changing too many variables at once. If broker, account type, VPS, lot size and EA settings all change together, the trader cannot tell which change produced the new behaviour. Make one controlled change, save the evidence and compare the result.
A practical test plan before full live use
- Confirm compatibility: verify platform, symbol, account type and the current PMotive product requirements.
- Reproduce safely: use demo or deliberately small exposure to confirm the specific issue or setting.
- Measure: track order acceptance, spread/slippage where relevant, drawdown, trade frequency and any platform errors.
- Set a stop rule: define what result pauses the test rather than improvising after a loss.
- Scale only after consistency: keep the environment stable while exposure changes gradually.
Official PMotive and platform references
- https://pmotive.com/collections/build-your-own-ea
- https://www.metatrader5.com/en/terminal/help/algotrading
Frequently asked questions
Does PMotive Custom EA Development guarantee profit?
No. Automated and manual trading can lose money. Social videos, backtests, historical results and screenshots do not guarantee future performance.
Where should I verify or buy PMotive Custom EA Development?
Use the official PMotive route at https://pmotive.com/collections/build-your-own-ea and keep checkout on the pmotive.com domain.
Why are PMotive social videos linked in this guide?
They provide brand verification and demonstrations of the workflow. They are supporting evidence, not a guarantee of future results.
What should I do before increasing live risk?
Keep the environment consistent, use controlled demo/forward testing, define maximum loss limits and scale only when your own evidence supports it.
Ready to verify the current product and checkout path?
If the product fits your platform, broker/account conditions and risk plan, continue through the official PMotive page. If a compatibility question remains, use PMotive support before paying or increasing live exposure.
Risk disclosure
Trading involves substantial risk. Forex, Gold, indices, cryptocurrencies and synthetic indices can move quickly. Expert Advisors, signals, backtests, testimonials, social-media demonstrations and historical results do not guarantee future performance. You can lose some or all of the money placed at risk. Use controlled testing, appropriate position sizing and only risk capital you can afford to lose.