Real-time breach checks: why prop firm rules must run on the tick
A rule that only checks overnight is not really a rule. Why breach and pass decisions belong on the price tick that causes them, and what a tick-level rule engine changes for your firm and your traders.
The PropExecutor Team · · 9 min read
Frequently asked questions
- What is a prop firm rule engine?
- It is the system that enforces your evaluation: profit target, daily loss limit, maximum drawdown, minimum trading days and instrument or exposure limits. A good rule engine checks these continuously and acts automatically - pausing a breached account or marking a passed one - rather than leaving it to a manual review.
- What does enforcing rules 'on the tick' mean?
- It means the rule is evaluated with the same price movement that could break it. The moment a price tick pushes an account past its daily loss or drawdown, the breach is registered and the account is paused - not that night, not the next morning, but at the instant it happens.
- Why is a nightly or cron-based check a problem?
- Because it lets accounts trade well past a limit before anything happens. A trader can blow through a drawdown line, keep trading for hours, and only be stopped in an overnight batch - which is unfair to disciplined traders and leaves your firm exposed to risk it already decided to cap.
- Does PropExecutor enforce rules in real time?
- Yes. The rule engine runs breach checks on the tick that could cause them, so a breach pauses the account instantly and a completed target is marked passed on the spot. There is no nightly batch deciding today's outcomes tomorrow.
- What are the core rules I can enforce?
- The standard set: profit target, daily loss limit, maximum drawdown, minimum trading days, allowed instruments, and position and exposure limits. You build them in a visual rule builder and combine them into rule sets for each challenge type.
- What are versioned rule sets and why do they matter?
- Every account freezes the version of the rule set it was created under. That means you can change tomorrow's rules without rewriting the challenge a trader is already halfway through - a fairness and disputes problem that has sunk more than one firm.
- How does real-time enforcement protect the firm?
- It caps risk at the number you chose. If your maximum drawdown is a hard line, the account stops at that line instead of drifting past it while a batch job sleeps. Real-time passes matter too: an account that hits its target is marked funded immediately, so your funded pipeline is always accurate.
- Is real-time enforcement fair to traders?
- It is the fair option. A trader who respects the rules is not disadvantaged by another who blew through a limit and kept trading. Everyone is measured by the same lines, evaluated at the same instant a price moves, with the rule status visible in their dashboard.
- Can traders see their rule status live?
- Yes. The prop dashboard built into every account shows equity, target progress, drawdown headroom and rule status in real time, so a trader always knows where they stand without leaving the terminal.
- Is the real-time rule engine included on the entry plan?
- Yes. Tick-level breach checks and the visual rule builder are part of every plan, including the $129 entry plan. Higher plans add more rule sets and custom rules, not a faster engine.
A rule that only checks at midnight is not a rule - it is a suggestion with a delay. If a trader can cross your maximum drawdown at 10am and keep trading until an overnight job notices, then the line you drew is not the line your firm is actually running. This is why breach and pass decisions belong on the price tick that causes them, and what changes when they do.
What a rule engine is supposed to do
Your evaluation is a set of lines: a profit target to reach, a daily loss limit and a maximum drawdown not to cross, a minimum number of trading days, and limits on instruments, position size and exposure. The rule engine is the part of the platform that watches those lines and acts on them - pausing an account that breaches, marking one that passes - without you sitting there watching charts.
The question that decides whether it works is simple: when does it check?
"On the tick" versus "on a cron"
There are two answers, and only one of them is a real evaluation.
- On a cron: the engine reviews accounts on a schedule - every few minutes, hourly, or in a nightly batch. Between checks, an account can do anything.
- On the tick: the rule is evaluated with the very price movement that could break it. The instant a tick pushes an account past its daily loss or drawdown, the breach registers and the account is paused.
The gap between those two is where firms lose money and traders lose trust. On a batch system, a trader can blow through a drawdown line, trade for hours past it, and only be stopped overnight - by which point the "maximum" drawdown was never actually the maximum.
The maximum drawdown should be the maximum, not a number a batch job gets around to. See PropExecutor's plans
Why real time protects your capital
You chose your risk limits for a reason. Real-time enforcement is what makes them true. When maximum drawdown is a hard line evaluated on every tick, the account stops at that line - not somewhere past it while a scheduled job sleeps. Your exposure is capped at the number you set, on the trade that hits it, every time.
Passes matter just as much. When an account reaches its profit target, a tick-level engine marks it passed on the spot, so your funded pipeline reflects reality the moment it changes instead of the next morning.
Why real time is the fair option
Fairness is not a soft concern in this business - it is retention. A disciplined trader who respects the rules should never be disadvantaged by one who crossed a limit and kept trading because the system had not looked yet. Tick-level enforcement measures everyone by the same lines at the same instant, and the prop dashboard in every account shows each trader their target progress, drawdown headroom and rule status in real time, so nobody is surprised by a decision made in the dark.
Same rules, same instant, for every trader. That is what keeps good traders around. Launch your firm from $129
Versioned rules, so today never rewrites yesterday
There is a second trap even fast engines fall into: changing the rules under accounts that are already running. On PropExecutor every account freezes the version of the rule set it was created under. You can improve tomorrow's challenge - tighten a limit, add a rule - without rewriting the evaluation a trader is halfway through. That single design choice removes an entire category of disputes.
You build all of it in a visual rule builder: profit target, daily loss, maximum drawdown, minimum trading days, instruments and exposure, combined into rule sets per challenge and versioned automatically.
What this looks like on every plan
Tick-level breach checks, real-time passes, the visual rule builder and versioned rule sets are part of every plan, including the $129 entry plan. Higher plans add more rule sets and custom rules - depth, not a different engine. The dashboard that shows traders their status is built into every account too, so real-time enforcement and real-time visibility ship together.
A rule engine that runs on the tick, on every account, from one payment. See the price list
Related reading: does your prop firm need a built-in trader dashboard. Or compare the plans now.
Written by
The PropExecutor Team
Product and engineering
We build PropExecutor: prop firm software that lets anyone launch a fully branded firm from $129, paid once, with a real-time rule engine and a dashboard in every trading account. These guides come from the same product we ship. About PropExecutor
