Set how much each trade risks and where trading stops, then carry the same limits into the EA.
You need
- Nebula open on New Test
- your account size, and your prop firm's rules if you trade a funded account
Steps (Standard lane)
Open Size and limits
Click New Test, then Standard. The right column is Size and limits.
New Test›Standard›Size and limits
Risk per trade0.50%
Prop limitsNo preset
Total drawdown10%
Daily loss3%
Weekly loss6%
Losing streak5
Stop trading when a limit is hit
Set Risk per trade
Drag the slider. The figure shows in gold, for example 0.50%. The shaded band is the setup range, 0.1% to 1%. Inside it the card says Inside setup range. Outside it says Outside setup range and the summary marks the risk untested.
Pick a prop firm preset, or none
Open Prop limits. No preset leaves your own numbers. A preset fills Total drawdown and Daily loss with that firm's rules and ticks Stop trading when a limit is hit.
Check or type the four limits
Total drawdown, Daily loss (percent, steps of 0.5), Weekly loss (percent) and Losing streak (trades in a row). Typing in Total drawdown or Daily loss sets the preset back to none.
Decide on Stop trading when a limit is hit
Ticked, systems that would break your limits are removed from the run. Unticked, they are only flagged. This tick needs Nebula Pro or Ultimate. On Free and Starter it is switched off when the build starts. The limits themselves still apply in the test.
Read the summary
SETUP SUMMARY shows Risk and Limits, for example "FTMO 2-Step Challenge, 10% total, 5% daily", and Stop at limit Yes or No.
Build, then deploy at the same risk
Deploy starts at the risk the system was tested at. Keep it there so the tested drawdown still applies.
Options: Standard lane
| Option | What it does | Default | When to change it | Plan |
|---|---|---|---|---|
| Risk per trade | Share of balance each trade risks. 0.1% to 5% | 0.50% | Stay in 0.1% to 1% for the tested setup | All plans |
| Prop limits | Fills Total drawdown and Daily loss from a firm's rules | No preset | When you trade that programme | All plans |
| Total drawdown | Trading stops if losses from the peak reach this | 10% | Match your firm or your own pain point | All plans |
| Daily loss | No new trades for the rest of the day once today's losses reach this | 3% | Match your firm's daily rule | All plans |
| Weekly loss | No new trades for the week past this | 6% | Rarely | All plans |
| Losing streak | Halts after this many losses in a row | 5 | Rarely | All plans |
| Stop trading when a limit is hit | Removes systems that would break the rules | On when a preset is picked | Prop firm builds | Pro and Ultimate |
Options: Explore lane (03 Risk & limits)
| Option | What it does | Default | Range | Plan |
|---|---|---|---|---|
| Account size ($) | The test account | 100,000 | Steps of 1,000 | All plans |
| Risk / trade | Share of balance each trade risks | 0.5% | 0.1% to 5% | All plans |
| Max total drawdown | The hard stop from the peak | 10% | 5% to 30% | All plans |
| Max daily loss | Stops new trades for the day | 3% | 1% to 10% | All plans |
| Prop-firm preset | Fills both limits. Firm chips under it pick each firm's first preset | Custom | Pro and Ultimate | |
| Enforce prop-firm limits | On removes rule breakers. Off flags them | Off | Pro and Ultimate (shows a PRO note below Pro) | |
| 04 Mode: Prop Firm | Drops systems that breach the firm's cap in replay. Low drawdown counts most | Custom | Pro and Ultimate |
Moving either drawdown slider switches the preset back to Custom.
The help line beside Risk / trade says 1% is a sensible default. The field itself starts at 0.5%, and the tested range is 0.1% to 1%.
Prop firm presets in 0.4.54
Every preset was checked on 21 Sep 2026. The app shows "Rules checked 2026-09-21. Confirm with your firm before you trade."
| Preset | Daily loss | Total drawdown |
|---|---|---|
| FTMO 2-Step Challenge | 5% | 10% |
| FTMO 2-Step Verification | 5% | 10% |
| FTMO 2-Step Account | 5% | 10% |
| FTMO 1-Step Challenge | 3% | 10% |
| FTMO 1-Step Account | 3% | 10% |
| FundedNext Stellar 2-Step Phase 1 | 5% | 10% |
| FundedNext Stellar 2-Step Phase 2 | 5% | 10% |
| FundedNext Stellar 1-Step Challenge | 3% | 6% |
| The5ers High Stakes Step 1 | 5% | 10% |
| The5ers High Stakes Step 2 | 5% | 10% |
That is the full list: ten presets. E8 Markets and FTUK are listed as not verified and have no preset.
A preset only fills the limits. You can edit every value. Firms change rules often.
How the limits reach the EA
When you deploy a single system, Nebula writes the test's limits into the EA's inputs:
| In Nebula | EA input |
|---|---|
| Risk per trade | InpRiskPct |
| Daily loss | InpMaxDailyLossPct |
| Weekly loss | InpMaxWeeklyLossPct |
| Total drawdown | InpMaxDrawdownPct |
| Losing streak | InpMaxConsecLosses |
At deploy:
- Risk mismatch: deploy blocked appears if you change the risk from the tested value. Cancel resets it.
- Drawdown fit appears if the tested drawdown is past your drawdown limit. It offers a smaller size so the drawdown fits. Drawdown grows roughly in line with risk.
- Account exposure check appears when other EAs already trade the account, because each one sizes off the whole balance.
If something goes wrong
Stop at limit reads Yes but nothing was removed
WhyBelow Pro the tick is switched off at launch
FixPro and Ultimate only
Prop-firm preset is greyed with a PRO lock (Explore)
WhyPresets on Explore are Pro and up
FixUse Prop limits on the Standard lane, or upgrade
Summary says "untested" after the risk
WhyRisk is outside 0.1% to 1%
FixMove the slider into the band
High frequency style shows a tip about risk
WhyFast systems hit the drawdown stop early above 0.5%
FixTry 0.25% to 0.5%
Drawdown fit unavailable at deploy
WhyThe system hit its drawdown cap in testing, so its full drawdown is unknown
FixLower the risk by hand, or test again without the cap
HALTED on a window
WhyThe drawdown cap was hit in that window
FixExpected. No new trades opened after it
Questions
Do the limits work on Free?
Yes. Every plan runs the test with your drawdown and daily loss as circuit breakers. Removing rule breakers from the run is Pro and up.
Is weekly loss on the Explore lane?
Not as a slider. It is set on Standard, or kept at its default of 6%.
Can I change limits after deploy?
You can edit the EA inputs in MetaTrader. The tested numbers then no longer apply.