Terms of Use
Last updated: 10 September 2026
These Terms of Use govern your use of Stratfy, a browser-based trading strategy backtester available at stratfy.io. By using Stratfy you agree to them. If you do not agree, please do not use the software.
1. Who we are
Stratfy is simulation software for traders. It is not a broker, a dealer, an exchange, an investment adviser, a portfolio manager or a financial institution, and it is not registered as any of those with any regulator. It does not hold client funds, place orders, or connect to a brokerage account on your behalf.
2. What Stratfy does
You describe a trading strategy in ordinary language. An AI model of your choosing converts that description into explicit entry, exit, stop-loss and filter rules. Those rules are then simulated against historical daily price data, with commission assumptions applied, and stress-tested across Monte Carlo resamples. Charts, metrics and Python exports are generated from that simulation.
Everything described above is a model of the past. It is not a prediction, a signal service, or an instruction to trade.
3. Backtested results are hypothetical
Every result Stratfy shows you is hypothetical. Backtested and simulated performance is calculated with the benefit of hindsight, on a strategy that was defined after the price history was already known. No real money was ever at risk in producing it, and no such account was ever traded.
Hypothetical results are subject to limitations that live trading is not. The equity backtest models slippage as a stated assumption rather than from quoted data: each fill is moved against the trade by a fixed number of basis points plus a fraction of ATR, on entry and on exit. The shape of that model is defensible; its magnitude is an assumption, and order SIZE is not modelled at all, so the execution cost it charges is a floor rather than an estimate — a large order would pay more. A strategy saved before this model existed keeps its original behaviour and is charged no slippage, which the app states on the result. No separate bid-ask spread is charged on the equity side. The Options Lab does model a bid-ask spread, but as a stated assumption rather than an observed quote. Hypothetical results also cannot fully account for gaps, partial fills, borrow availability, halts, dividends and corporate actions, data errors and survivorship bias in historical price series, changes in market regime, taxes, or your own behaviour under drawdown. A strategy adjusted until it looks excellent on past data — overfitting — is the single most common reason a promising backtest fails in the market.
Past performance does not guarantee or indicate future results. Monte Carlo bands, ruin probabilities, Sharpe ratios and equity curves are estimates produced from assumptions, not measurements of what will happen. You should assume that live results will be worse than backtested results, and you should never risk capital you cannot afford to lose.
4. No financial advice
The Options Lab is a model, and a deliberately simple one. It prices with Black-Scholes, which values European options, while US listed equity options are American and can be exercised early. It applies a single flat volatility across every strike, so it does not represent skew. That volatility is realized volatility used as a stand-in for implied, because no implied-volatility history is available to it. Dividends enter as a trailing-twelve-month continuous yield rather than the scheduled discrete payments a real contract sees. The bid-ask spread it charges is a stated assumption, not an observed quote. The payoff diagram and the Greeks follow exactly from the structure you specify; the historical profit and loss does not, and should be read as an order of magnitude rather than a measurement.
Nothing produced by Stratfy — including parsed rules, metrics, charts, exported code and any text generated by an AI model — is investment, legal, tax or accounting advice, or a recommendation, solicitation or offer to buy or sell any security, derivative or other instrument. No content is tailored to your objectives, financial situation or risk tolerance, and we do not know them.
Trading involves substantial risk of loss, including the risk of losing more than your initial deposit where leverage or derivatives are involved. Decisions you make with Stratfy are yours alone. Consider consulting a licensed professional in your jurisdiction before acting on any idea you test here.
5. Your AI provider key and costs
Stratfy requires you to supply your own API key from Anthropic, OpenAI or Google. That key is held in your browser's memory for the current session only and sent with each request through our Cloudflare Worker proxy, which forwards it to the provider you chose and does not log, store or cache it. Your use of the provider is governed by that provider's own terms and pricing, and the provider bills you directly for it.
Stratfy itself is free. We do not charge you, resell AI capacity, or subsidise your usage. You are responsible for keeping your key secret, for the charges incurred on it, and for revoking it if you believe it has been exposed.
6. No account, and your data lives with you
There is no sign-up, password or email requirement. Your saved strategies are stored in your own browser's local storage, and your API key is kept only in memory for the current session. Clearing your browser data, using private browsing, or switching device or browser will remove them, and we cannot recover them for you. If your work matters to you, export it.
7. Price data is yours, and so is the right to use it
Stratfy does not supply or fetch market prices. You load your own OHLCV files, they are read in your browser, and every result you see is computed from the data you provided. We make no representation about it.
You are responsible for having the right to use the data you load. Price data is usually licensed, and a licence that permits you to view or download a series does not necessarily permit you to use it for backtesting, to retain it, or to redistribute it. Check the terms attached to your source. Do not load data you are not permitted to use this way.
Whatever its source, historical price data is used as-is for research and simulation. It may contain gaps, errors, stale values, unadjusted corporate actions or revisions, and it is not real-time, not guaranteed for accuracy, and not suitable for order execution, valuation, accounting, tax reporting or any regulated purpose. Where your file does not carry an adjusted-close column, Stratfy uses the prices exactly as given and says so on the result.
Data source credit. Brazilian interest-rate series (CDI and Selic) are retrieved from the Sistema Gerenciador de Séries Temporais (SGS) of Banco Central do Brasil, used as open public data. Banco Central does not endorse Stratfy and is not responsible for anything computed from those series.
8. Acceptable use
- Do not present Stratfy output as audited, verified, or actual trading performance to any third party, and do not use it to solicit investment.
- Do not use Stratfy where doing so would breach the law or a regulation that applies to you, or the terms of your AI provider or data source.
- Do not attempt to overload, scrape at scale, reverse-engineer for redistribution, or resell access to the software.
- Do not use Stratfy if you are under 18 or below the age of majority where you live.
9. Availability and changes
Stratfy is provided on a best-effort basis. Features, data coverage, calculation methods and this software may change, break or be discontinued at any time without notice, and no result you obtained previously is guaranteed to be reproducible later.
10. Intellectual property
The Stratfy name, interface, design and code are ours and are protected by copyright and other rights. Strategy descriptions you write remain yours. Python code Stratfy exports for you is yours to use, modify and run, at your own risk.
11. Disclaimer of warranties
Stratfy is provided "as is" and "as available", without warranty of any kind, whether express, implied or statutory, including any warranty of merchantability, fitness for a particular purpose, accuracy, non-infringement, or uninterrupted or error-free operation. We do not warrant that any calculation, metric, parsed rule or exported script is correct, complete or suitable for your purposes.
12. Limitation of liability
To the maximum extent permitted by law, we are not liable for any trading or investment loss, lost profit, lost opportunity, loss of data, or any indirect, incidental, special, consequential or punitive damages arising from your use of Stratfy or reliance on anything it produces — including any loss caused by an error in a calculation, a parsed rule, market data, or an AI model's output. Where liability cannot be excluded, it is limited to the greater of the amount you paid us for the software (which is zero) or the minimum amount the applicable law requires.
13. Indemnity
You agree to hold us harmless from claims, losses and expenses arising out of your use of Stratfy, your trading decisions, your use of exported code, or your breach of these Terms.
14. Governing law
These Terms are governed by the laws of the Federative Republic of Brazil, and the courts of the Federal District (Distrito Federal, DF), Brazil, have jurisdiction, without prejudice to any mandatory consumer protection rights available to you where you live.
15. Changes to these Terms
We may update these Terms. The current version is always the one published on this page, and the "last updated" date above shows when it changed. Continuing to use Stratfy after a change means you accept the revised Terms.
16. Contact
Questions about these Terms: [email protected].