Fantasy decisions, explained

Privacy in the Dynasty Trade Calculator preview

How the current browser-based preview handles league lookups and projection files.

League requests

When you connect a Sleeper league, your browser sends the username or league ID to Sleeper’s API. The returned rosters and standings are displayed in the page. This preview has no Dynasty Trade Calculator account database or server-side league storage.

Projection files and calculator inputs

Uploaded projection JSON is read in your browser’s memory. The current implementation does not upload it to a Dynasty Trade Calculator server or persist it in browser storage. Reloading the page clears imported state. FPL scenario inputs are also processed locally.

Third-party requests

The calculator loads fonts from Google Fonts and player images from ESPN and Premier League infrastructure. Those services receive normal browser requests, including connection information. Hosting providers may also retain request logs. This notice does not describe those providers’ separate practices.

Tracking and payments

Vercel Web Analytics measures page visits and referral traffic on the deployed site. It does not use analytics cookies. Query strings and URL fragments are removed before page URLs are sent; calculator inputs and uploaded projection files are not included in analytics events. No advertising tracker, SMS subscription or payment processor is configured. Hosting is provided by Vercel. See Vercel’s privacy documentation for its processing practices.

Before public launch

A responsible operator and support contact, hosting details and any new data processors must be identified before public signups. Do not enter passwords, payment details or sensitive personal information into this preview.