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<img src="./docs/assets/banner.png" alt="Prop Firm Sim. Know your odds before you pay the fee. Monte Carlo, deterministic, open source." width="100%"> <h1 align="center">Prop Firm Sim</h1> Prop Firm Sim is a <a href="https://www.luxalgo.com">LuxAlgo</a> open-source project. <a href="https://github.com/LuxAlgo/prop-firm-sim/actions/workflows/ci.yml"><img src="https://img.shields.io/github/actions/workflow/status/LuxAlgo/prop-firm-sim/ci.yml?branch=main&style=flat-square&label=CI&labelColor=0a0a0a" alt="CI status"></a> <a href="https://www.npmjs.com/package/@luxalgo/prop-firm-sim-core"><img src="https://img.shields.io/npm/v/%40luxalgo%2Fprop-firm-sim-core?style=flat-square&label=npm&labelColor=0a0a0a&color=0d8ed6" alt="npm version"></a> <a href="./LICENSE"><img src="https://img.shields.io/badge/license-MIT-555555?style=flat-square&labelColor=0a0a0a" alt="MIT license"></a> <a href="https://www.luxalgo.com/prop-firm-sim/">Homepage</a>&ensp;·&ensp; <a href="#thirty-seconds-to-your-odds">Quickstart</a>&ensp;·&ensp; <a href="#why-your-odds-are-worse-than-you-think">Why your odds are worse</a>&ensp;·&ensp; <a href="#run-it-on-your-real-trades">Your real trades</a>&ensp;·&ensp; <a href="#the-same-engine-three-ways">Packages</a>&ensp;·&ensp; <a href="#where-the-rules-come-from">Rules data</a>&ensp;·&ensp; <a href="./docs/rule-semantics.md">Method</a> Prop Firm Sim tells you your odds before you pay for a prop-firm challenge. Give it your trading statistics, or your actual trade history, and it plays ten thousand complete challenge journeys through the firm's exact ruleset. Out come the numbers that matter: pass probability per phase and joint, with confidence intervals. Expected attempts, total cost, and expected value with every fee priced in. Time to funding, stagnation, and the probability a funded account ever collects a payout. The engine is pure, deterministic TypeScript: everything runs locally, and the same seed reproduces the same numbers byte for byte. Firm rules come live from [LuxAlgo's public prop-firm directory](https://www.luxalgo.com/prop-firms/) (keyless, read-only), and any ruleset can be passed inline, fully offline. ## Thirty seconds to your odds ```bash npx @luxalgo/prop-firm-sim-cli simulate \ --firm ftmo --challenge 100k-2step \ --winrate 0.48 --avg-win 1.6 --avg-loss 1 \ --risk 1% --trades-per-day 4 ``` ```text FTMO · FTMO Challenge 100K (2-step) ftmo/100k-2step · cfd · account 100,000 USD · fee 540 USD one-time Data: live LuxAlgo directory · provenance directory, every simulated rule read from a structured directory column Trader: win rate 48.0% · avg win 1.6R · avg loss 1R · 4 trades/day · risk 1% of balance per trade Run: 10,000 paths · seed 42 · attempt cap 25 · engine 1.0.0 Pass probability per attempt 93.2% (95% CI 92.7–93.7%) Step 1 · target +10% 96.5% (95% CI 96.2–96.9%) · fails: max-loss 3.5% Step 2 · target +5% 96.6% (95% CI 96.2–96.9%) · fails: max-loss 3.4% Avg days per attempt 16.5 when passed · 16 when failed Funded within 25 attempts 100.0% (95% CI 100.0–100.0%) Attempts until funded mean 1.1 · p50 1 · p90 1 Total cost mean 39.26 USD · p50 0 USD · p90 0 USD · p95 540 USD Cost when funded mean 39.26 USD · p50 0 USD · p90 0 USD Days to funded (trading days) p50 15 · p75 22 · p90 31 Stagnation (days without a new equity high) p50 4 · p90 12 EV · challenge journey + funded horizon of 90 trading days EV total +66,755 USD ± 589 USD (95% CI) P(EV > 0) 96.2% Payout if funded mean 66,794 USD · p50 71,011 USD · avg 6.8 payout events Payout probability | funded 96.2% Days to 1st payout p50 10 · p90 10 Funded accounts blown 26.0% within the horizon Max drawdown while evaluating p50 5.9% · p95 12.5% of initial balance Not simulated / assumptions: • trades-resolve-same-day: All trades are modeled as same-day round trips; overnight and weekend holding are not simulated. • intra-trade-excursions-not-modeled: Equity is observed at each trade close; favorable/adverse excursions inside a trade are not modeled, which slightly understates trailing-drawdown and open-PnL breach risk (real odds are somewhat worse). ...five more flags follow: every run prints the full assumptions list and the disclaimer. ``` That trader is good. Profit factor near 1.5, and the static max loss still kills 3.5% of step-one attempts, while 26% of the funded accounts blow up within 90 trading days. Drop the win rate three points (the built-in sensitivity panel shows exactly this) and the picture darkens fast. Prefer a browser? The same run in [the hosted simulator](https://www.luxalgo.com/prop-firms/): <img src="./docs/assets/simulator-dark.png" alt="Simulation results: the attempt verdict with pass, fail and timeout shares, then a KPI grid with per phase pass rates, joint pass probability, net EV, payout probability, expected cost and stagnation" width="100%"> <a href="https://www.luxalgo.com/prop-firms/">The hosted simulator</a> after one run: verdict, per phase and joint pass rates, EV with fees priced in, and the stagnation tile. Everything runs client side; nothing you enter leaves your browser. ## Why your odds are worse than you think Every prop-firm calculator you have seen multiplies a win rate into a binomial formula. That number is wrong, and wrong in the house's favor, because the odds do not live in the profit target. They live in the exact mechanics of the loss rules. 1. **"Trailing drawdown" is four different rules.** A max loss that is static from the initial balance, one that trails end-of-day highs, one that trails peak unrealized equity intraday, and one that trails then locks at breakeven are wildly different odds wearing the same headline number. The intraday variant, standard on futures evaluations, routinely cuts pass probability by a third versus the static rule at the same limit. [The semantics, with pen-and-paper examples.](./docs/rule-semantics.md) 2. **A "5% daily loss" is four choices multiplied together.** Five percent of what, anchored to which day-start number, counting open P&L or not, checked live or only at the close. Same headline, different survivors. Every switch is explicit in the spec schema. 3. **Your trades come in streaks; the naive math assumes they do not.** Streaks are exactly what breach daily-loss and trailing rules. Paste your real R-multiples and the engine block-bootstraps them, preserving your autocorrelation. With a tight loss limit, i.i.d. math overstates your pass probability, and the flattery lands exactly where the rules bite. 4. **The risk that maximizes passing is not the risk that maximizes EV.** Passing wants small risk, to survive the floors. EV wants more, because fees are fixed and payouts scale. Here is that curve, from a realistic two-step ruleset, reproducible with one command: <img src="./docs/assets/risk-sweep.svg" alt="Risk sweep: pass probability and EV against risk per trade. The two maxima land on different risk sizes." width="100%"> ```bash npx @luxalgo/prop-firm-sim-cli optimal-risk --firm ftmo --challenge 100k-2step \ --winrate 0.48 --avg-win 1.6 --trades-per-day 4 --seed 42 ``` 5. **You probably overestimate your win rate.** Every simulate run can carry a sensitivity panel: what one percentage point of win-rate optimism costs you in pass probability. It is usually a lot. 6. **Getting funded is not getting paid.** Consistency rules are simulated: one outsized day raises your effective target, and the extra days at risk are sometimes the days the trailing floor gets hit. So is payout gating: winning-day minimums, profit buffers, per-payout caps. Results report the probability a funded account ever collects a payout, and how long the first one takes. 7. **Dead time is part of the price.** Every result reports stagnation: the longest stretch of days without a new equity high inside an attempt. Cutting risk raises your pass odds and stretches your stagnation. Surviving is slow, and slow is what makes traders abandon accounts and force trades. The centerpiece of the hosted simulator draws all of this at once: 800 traced equity paths against the ruleset's actual moving loss floor. Under trailing rules you can watch the floor ratchet up beneath the paths. <img src="./docs/assets/simulator-fan.png" alt="Equity path fan: 800 traced Monte Carlo paths over 70 trading days, step targets as dashed lines, and the median max loss floor ratcheting upward beneath the paths" width="100%"> ## Run it on your real trades Summary stats are a start. Timestamps are the truth. Paste or upload your trade history: real platform exports import directly (TradingView list of trades, MT4/MT5 statements including the HTML reports, MT5 deals tables, ThinkOrSwim account statements), along with plain timestamped CSVs, a documented generic template, and broker trade history as JSON in the open-source [@luxalgo/broker-sdk](https://github.com/LuxAlgo/broker-sdk) shape, so a live broker pull drops straight into the simulator. Files that carry P&L but no risk data are refused until you state the risk you took per trade: R-multiples are computed, never fabricated. With timestamps in hand, two more questions become answerable: **What if I stop trading around news?** Prop firms restrict or frown on positions opened around scheduled releases, and some pay out only if you avoided them. The news filter replays your log with every trade opened inside a configurable window (minutes before and after, impact tier, currency) removed, on a recurring release calendar, then simulates both versions with the same seed. You see the delta, not a lecture. Sometimes avoiding news costs you probability, and the card says so. <img src="./docs/assets/simulator-news.png" alt="Avoiding news windows card: pass rate with all trades versus avoiding news, the delta in points, and the count of excluded trades and calendar events" width="100%"> **Would a combined portfolio get me audited?** Upload up to five strategy histories for one simulation. Before merging them chronologically, the overlap audit counts same-direction positions open at the same time across histories, exactly what a payout reviewer looks for in copied accounts, and flags the risk with disclosed heuristic bands before you find out the expensive way. <img src="./docs/assets/simulator-audit.png" alt="Portfolio overlap audit banner: high audit risk flagged across two histories, with overlap share, same direction share and the tolerance disclosed" width="100%"> ## The same engine, three ways | Package | What it is | | ----------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [`@luxalgo/prop-firm-sim-core`](./packages/core) | The engine. Pure TypeScript, zero I/O, browser and worker safe, deterministic under seed (permalinks reproduce byte for byte). 10,000 paths in about a third of a second. | | [`@luxalgo/prop-firm-sim-cli`](./packages/cli) | `simulate`, `optimal-risk`, `compare`, `overlap`, `firms`, `rules` in your terminal, on live directory data or inline specs. | | [`@luxalgo/prop-firm-sim-mcp`](./packages/mcp) | MCP server exposing the simulator to AI agents. Ask your assistant: given my last 200 trades, what are my odds on this challenge, and at what risk? | | [the hosted simulator](https://www.luxalgo.com/prop-firms/) | The same engine in your browser, client side only, with precomputed reference odds per firm. | Use the core directly: ```ts import { simulate } from "@luxalgo/prop-firm-sim-core"; import { adaptFirm } from "@luxalgo/prop-firm-sim-core/directory"; // Live rules from the LuxAlgo directory, or build the spec object yourself: // the engine is pure and needs no network at all. const { propfirms } = (await (await fetch("https://app.luxalgo.com/api/propfirms/list")).json()).data; const challenge = adaptFirm(propfirms.find((f) => f.propfirmId === "ftmo"))[0]; const result = simulate( challenge.spec, { kind: "parametric", winRate: 0.52, avgWinR: 1.8, tradesPerDay: 3, risk: { mode: "percent-of-balance", value: 0.5 }, }, { paths: 10_000, seed: 42 }, ); result.perAttempt.passProbability; // with Wilson 95% CI alongside result.perAttempt.stagnationDays; // dead time distribution per attempt result.journey.cost.mean; // expected total cost to funded result.ev.evTotal; // E[payouts minus fees] over the funded horizon result.assumptions.flags; // every simplification, spelled out challenge.provenance; // "directory" or "directory+inferred", inferred fields listed ``` Have real trade history? Feed a raw R-multiple series into bootstrap mode, or run any broker export through `importTradeHistory` (structured diagnostics, adapter detection, a strict R-provenance ladder; see [docs/trade-import.md](./docs/trade-import.md)) and a timestamped log unlocks the context tools (`parseTradeLog`, `filterTradesAroundNews`, `mergeTradeLogs`, `analyzeOverlap`). Your odds, from your actual trades, computed locally. ## Where the rules come from Firm and challenge data is fetched at runtime from LuxAlgo's public prop-firm directory API (`https://app.luxalgo.com/api/propfirms/list`, keyless and read-only, the data behind [luxalgo.com/prop-firms](https://www.luxalgo.com/prop-firms/)), then adapted into simulatable specs by [`@luxalgo/prop-firm-sim-core/directory`](./packages/core/src/directory) under a three-tier honesty policy: 1. **Structured rule columns are used verbatim.** Exact drawdown mode, daily-loss anchor semantics, consistency caps, payout gating. 2. **Free text is inferred only when one reasonable reading exists**, and every inferred field is disclosed in the result (`provenance: "directory+inferred"`, `inferredFields: [...]`). 3. **Ambiguity is refused.** A challenge whose loss semantics cannot be established is reported as not simulatable instead of being guessed. The max-loss mode is too consequential to guess. When the directory serves a source citation (`sourceUrl`, `lastVerifiedAt`), it passes through into the spec's `sources` and every result. The data is data, not endorsement: no rankings, no offers, no affiliate anything in any simulation result. Rules the engine cannot faithfully simulate are declared (`flagsNotSimulated`) and echoed into every result rather than silently dropped. Firms change rules without notice. **The firm's page is always authoritative.** Found drift? [Report it.](https://github.com/LuxAlgo/prop-firm-sim/issues/new/choose) And any ruleset, including one the directory refuses or does not carry, can be passed inline as a `spec` object, fully offline. ## Assumptions, owned loudly The full list ships inside every result (`assumptions.flags`), but the big ones: - Trades are same-day round trips; intra-trade excursions are not modeled. This slightly understates trailing-drawdown risk, so real odds are somewhat worse. - Attempts are i.i.d. draws from your stated stats: no learning, no tilt. - Consistency rules, payout gating (winning days, buffers, caps) and locking trails **are simulated**. Scaling plans and remaining firm-specific niceties are not; entries that have them say so, and results repeat it. - The funded stage is a horizon simulation: withdrawals take the maximum the rules allow and never cross the loss floor; monthly billing approximates to 21 trading days. - The news calendar is a recurring template, not a historical feed, and every filtered result says so. Simulation, not prediction. Distributions, never promises. **[Read the full disclaimer.](./DISCLAIMER.md)** ## Development ```bash pnpm install pnpm build # topological: core, then cli and mcp pnpm test:run # unit tests incl. hand-computed micro-cases for every drawdown semantic pnpm bench # hot-loop benchmark ``` Engine changes that move simulated numbers must update the golden snapshots and justify themselves in the PR. Silent drift in published odds is the one bug this repo treats as unforgivable. See [CONTRIBUTING.md](./CONTRIBUTING.md). ## License MIT © [LuxAlgo Global, LLC](https://luxalgo.com). Free to use, embed, fork, and verify. No telemetry, no tracking, in any package. The project name and the LuxAlgo name and logo are trademarks; see [TRADEMARKS.md](./TRADEMARKS.md). Security reports: [SECURITY.md](./SECURITY.md).

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