TL;DR: A prop firm challenge is a risk test with a profit target attached, so the rules shape your strategy, not the other way round. In our replays, the 3% daily loss limit ended most failed attempts on the Classic and Pro 1-Step at aggressive sizes, and out-of-sample pass rates sat far below what the backtests showed. Size for your worst day, test on every possible start date, forward-test cheaply, and decide in advance what happens after you pass.
What is a prop firm challenge really testing?
A proprietary trading firm lets traders trade its capital. Before it does, many firms sell an evaluation: you pay a fee, trade an account with a set starting balance, and must reach a profit target without breaking a daily loss limit or a maximum drawdown. Pass, and you move to a funded account that keeps the loss limits. Many crypto prop firms work the same way, often on perpetual futures that trade around the clock.
A trader who makes 10% in a month with one 4% losing day has failed a 3% daily limit. The challenge tests whether your worst moments fit inside the box, not whether your average month is profitable.
Why do the rules matter more than the strategy?
Because the rules are where attempts end. Here is one rule set, from Propr's published rules:
| Challenge | Profit target | Daily loss limit | Max drawdown | Fee for $10k |
|---|---|---|---|---|
| Classic 1-Step | +10% | 3% | 6% static | $110 |
| Turbo 1-Step | +9% | 3% | 3% static | $50 |
| Pro 1-Step | +12% | 3% | 5% static | $85 |
| Classic 2-Step | +5%, then +10% total | 5% | 8% trailing | $100 |
Three details decide how you should trade, and firms differ on each:
- Where the daily loss is measured from. On Propr it is the balance the day began with (the 00:00 UTC realised-balance snapshot), not your starting balance. A losing position carried over midnight eats into the next day's allowance.
- Equity, not closed trades. Breaches are judged on equity at any moment, open positions included, so a momentary touch of the floor counts.
- Static or trailing drawdown. A static floor never moves. A trailing floor follows your peak, so profits you give back can end the attempt. Our trailing vs static drawdown guide works through both with dollar examples.
The same strategy can pass one rule set and fail another.
What are your honest odds before you start?
There is a baseline every challenge trader should know. If your trading has no edge, your equity behaves roughly like a random walk. The classic gambler's ruin result says the chance of reaching a target before a floor is then about drawdown ÷ (target + drawdown):
| Challenge | Target | Drawdown | Zero-edge pass chance |
|---|---|---|---|
| Classic 1-Step | 10% | 6% | about 37.5% |
| Turbo 1-Step | 9% | 3% | 25% |
| Pro 1-Step | 12% | 5% | about 29.4% |
| Classic 2-Step | 10% | 8% trailing | about 32% (the simple formula's 44% ignores the trailing floor) |
Trading costs push you below this line, because every round trip is a small loss. Position size does not change the number: trading smaller only makes the attempt slower. Only a real edge lifts you above the ceiling. The odds math post explains why.
What does our backtest data show?
We replayed each of Trigr's Propr house plans with a fresh challenge started on every UTC day since 2023-07-24 (since 2024-04-02 for the Conservative tier), each start given up to 365 days, under Propr's exact rules, with trading fees, 3 bps of slippage per side and funding. Here is the Classic 1-Step:
| Plan | Backtest pass | 90% interval | Median days to pass | Failed by daily loss | Failed by drawdown |
|---|---|---|---|---|---|
| Fast | 60% | 54–69% | 20 | 36% | 4% |
| Balanced | 87% | 78–95% | 53 | 2% | 11% |
| Conservative | 99.8% | 99.8–100% | 193 | 0% | 0.2% |
Why you should not plan around those numbers
These numbers are in-sample: the plans were chosen with the 2025 data visible. The daily starts also overlap: consecutive start days share most of their path, so 798 starts are not 798 independent tries. The 90% interval comes from a block bootstrap, which still understates the uncertainty.
In September 2026 our team ran an out-of-sample test: we picked candidates using only 2020–2023 starts and scored them on 2025–26 starts. Picks that scored 40–80% in-sample plateaued at about 25–34% out of sample (median around 30%) within a 180-day window. With a one-year window and small sizes, the bands rose to roughly 34–45% for passes within 2–5 weeks and about 54% for 5–12 weeks. Our realistic planning figure for the slowest, smallest-size tier is 40–55%, not 90–100%.
Those out-of-sample figures sit close to the zero-edge ceilings above. A published community bundle that claimed about 94% passed 0–44% depending on size when we ran it under the real rules, and never passed a 2025 start within a year. The full table for all twelve plans is in prop firm challenge pass rates.
Which rule ends an attempt first?
It depends on size and rule set:
- Classic and Pro 1-Step at aggressive size: the daily limit. Classic 1-Step Fast failed 36% of starts on daily loss and 4% on drawdown. Pro 1-Step Fast: 30% versus 12%.
- Classic and Pro 1-Step at Balanced size: drawdown. Classic Balanced failed 2% on daily loss and 11% on drawdown; Pro Balanced 10% versus 15%.
- Turbo at any size, and the 2-Step: drawdown. Turbo's 3% static drawdown is as tight as its daily limit, so losses that build over several days end it (Turbo Fast: 13% daily versus 28% drawdown). The 2-Step's trailing floor ended 30% of its Fast starts, against 7% on daily loss.
Find out which tripwire your sizing hits first. The daily loss limit guide shows how a single day of correlated stops breaks a 3% limit.
How should you size positions for a challenge?
- Budget the worst day. Add up what every open position loses if all stops hit on the same day, plus costs, and keep it well under the daily limit.
- Treat correlated positions as one. Three crypto longs that fall together are one large bet.
- Keep leverage low. Our best results came at 1–3x. At 10x, a round trip of about 17 bps costs about 1.7% of the account per trade.
- Leave a buffer. Sizing that fits history by a hair is likely to breach live.
The challenge position sizing guide has the formulas, and crypto position sizing and risk settings covers stops and exits.
A step-by-step process
- Read the rules, then pick the challenge. Compare zero-edge ceilings and fees together. As a planning estimate, a $10k Classic 1-Step costs about $390 per pass; a Turbo 1-Step attempt aimed at passing in 1–2 days costs about $200–220 per pass ($50 fee at roughly 23–25% odds).
- Backtest on every start date. One start shows one path; a replay from each day shows how often you would have failed.
- Check out of sample. Choose on older data, score on newer data. Read out-of-sample testing and selection bias before trusting any high pass rate, including ours.
- Size to fit with room. Shrink until the worst simulated day and worst drawdown sit clearly inside the limits.
- Forward-test on paper. A paper agent catches behavior a backtest hides.
- Go live and leave it alone. Raising size after a loss is a classic way to breach.
- Decide what happens after the pass. A strategy with no edge keeps gambling on the funded account, which has the same loss limits.
Prop firm challenge checklist
- I know whether the daily loss is measured from the day's opening balance or the starting balance.
- I know whether breaches are judged on equity.
- I know whether my drawdown is static or trailing, and where the floor sits in dollars.
- My worst simulated day, with all correlated stops hit, fits under the daily limit with a buffer.
- I have tested my strategy on many start dates and on data it was not chosen on.
- I have compared my expected pass rate to the zero-edge ceiling for this challenge.
- I have forward-tested at live prices.
- I have a written plan for the funded account.
How Trigr fits in
Trigr is a strategy builder and backtester whose agents trade on Hyperliquid and Propr. Discover › Propr lists Fast, Balanced and Conservative plans for each Propr challenge, with backtest pass rates, failure splits and a live record. That live record is young: forward challenges started on 2026-09-30, and as of 2026-10-05 each plan has six running, none breached and none finished. A live pass rate appears once 90 forward challenges have run their full 365-day window, so not before late 2027. A plan is hidden if that rate is under 50%, or earlier if more than half of at least 90 started challenges have already breached.
When you deploy your own agent on Propr, a rules check replays the combined backtest with a fresh challenge on every UTC day against the account's real limits (a house plan skips this step: Trigr shows the plan's measured record and sizes every slot itself). If it fails, you can press Optimize sizing, which shrinks positions over up to three re-runs per press until the backtest fits with a 0.5% margin under each limit. Live trading is available on every plan, including Free (see pricing). Plans that include Trigr Advanced strategies (11 of the 12 house plans) need a subscription with the Advanced library. If you take a Propr challenge, you can open one through our referral link. None of this replaces an edge, and no tool can promise a pass.