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Trust and privacy

Privacy, explained clearly.

This policy explains what information QuantLions processes when you visit the website, create an account, connect the ChatGPT app, or run trading research.

Last updated August 31, 2026

ControllerData we processHow we use itService providersRetentionYour rights

1. Who is responsible

QuantLions is operated by Matheus Dümpelmann. Privacy questions and data requests can be sent to [email protected].

2. Information we process

  • Account and authentication information, such as name, email address, account identifiers, and login events.
  • Research inputs and results, including strategy configurations, symbols, timeframes, backtest requests, saved experiments, and generated analytics.
  • Billing and subscription information. Payment-card details are handled by the payment provider and are not stored by QuantLions.
  • Technical and security information, including IP address, device and browser information, timestamps, diagnostic logs, and abuse-prevention signals.
  • Support messages and any information you choose to include in them.
  • Information supplied through ChatGPT that is necessary to complete the request you make with the QuantLions app.

3. Why we use information

We process information to provide accounts and research services, execute and display requested backtests, calculate usage credits, secure the platform, diagnose failures, respond to support requests, administer subscriptions, and meet legal obligations.

Where applicable, the legal bases include performance of a contract, steps requested before entering a contract, legitimate interests in operating and securing the service, consent where requested, and compliance with legal obligations.

4. Service providers and ChatGPT

We use service providers for infrastructure, authentication, payments, communications, monitoring, and customer support. They process information only for the services they provide and under applicable contractual safeguards.

When you use the QuantLions app in ChatGPT, relevant parts of your request are sent to QuantLions so the requested research can be performed. OpenAI separately processes information under its own terms and privacy policy.

We do not sell personal information. We may disclose information when required by law, to protect the service or its users, or as part of a properly structured business transaction.

5. Retention and security

We retain information only for as long as necessary for the purposes described above, including account operation, saved research, security, billing, dispute resolution, and legal recordkeeping. Retention periods differ by data category. Account deletion requests may be subject to records we must retain by law.

We use technical and organisational safeguards designed to protect information. No internet service can guarantee absolute security.

6. Your choices and rights

Depending on your location, you may have rights to access, correct, delete, restrict, object to, or receive a copy of personal information, and to withdraw consent. You may also complain to the competent data-protection authority.

Send requests to [email protected]. We may need to verify your identity before fulfilling a request.

7. Updates

We may update this policy as the service or applicable requirements change. The current version and its effective date will remain available on this page.

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