Last updated: April 2026
leaguemate.fyi is an independent, fan-made tool and is not affiliated with, endorsed by, or sponsored by Sleeper or any other fantasy sports platform. Sleeper is a trademark of Sleeper Holdings Inc. All league data displayed on this site is fetched directly from the public Sleeper API on your behalf and is owned by you and Sleeper.
Dynasty player values are sourced from KeepTradeCut and FantasyCalc. leaguemate.fyi is not affiliated with or endorsed by either.
By accessing or using leaguemate.fyi (the “Service”), you agree to be bound by these Terms of Service. If you do not agree, please do not use the Service.
leaguemate.fyi is a read-only fantasy football analytics tool. It retrieves publicly available data from the Sleeper API using your Sleeper username, and uses that data to generate personalized dynasty strategy analysis, player recommendations, draft projections, and trade simulations. Optional account creation (via Google OAuth) enables persistent league access and one-tap switching across your leagues. The Service does not interact with your Sleeper account beyond reading publicly available data.
leaguemate.fyi is an independent project and is not affiliated with, partnered with, or approved by Sleeper Holdings Inc. or any of its subsidiaries. Use of the Sleeper API is subject to Sleeper's own terms of service. leaguemate.fyi makes no representations on behalf of Sleeper.
See the Privacy Policy below for full details on data collection and handling.
All analysis, verdicts, projections, and recommendations provided by leaguemate.fyi are generated algorithmically and are intended for informational and entertainment purposes only. They do not constitute professional sports or financial advice. Accuracy is not guaranteed. Fantasy sports involve inherent uncertainty, and no tool can reliably predict player performance or trade outcomes.
The Service is provided “as is” without warranties of any kind. leaguemate.fyi and its operators shall not be liable for any direct, indirect, incidental, or consequential damages arising from your use of or inability to use the Service, including any decisions made based on analysis provided by the Service.
The leaguemate.fyi name, design, and original content are the property of the Service operator. Sleeper, Sleeper-related trademarks, and all associated intellectual property belong to their respective owners. Third-party data sources (including KeepTradeCut dynasty values and FantasyCalc trade data) are subject to their own terms.
These terms may be updated at any time. Continued use of the Service after changes are posted constitutes your acceptance of the revised terms. The “last updated” date at the top of this page will reflect the most recent revision.
Questions about these terms can be directed to gvem@duck.com.
Anonymous use: Your Sleeper username is stored only in your browser's session storage and is never sent to our servers.
Signed-in use: When you create an account via Google OAuth, Supabase Auth stores your email address and Google account identifier as part of authentication. We additionally store your linked Sleeper account details (username, user ID, display name, avatar) in our database to provide persistent access.
Subscriptions: If you subscribe to the Pro plan, we store your subscription status and billing period dates. Payment is processed by Stripe — your card details are never transmitted to or stored on our servers.
League rosters, matchup history, and player data are fetched directly from the Sleeper public API on demand and are not persisted on our servers.
We collect anonymous, aggregated usage analytics via PostHog (e.g. page views, feature usage) to understand how the product is used and improve it. No personally identifiable information is included in these analytics.
We do not sell, rent, or share your personal information with third parties. We use the following services to operate the product: Supabase (database), Stripe (payments), PostHog (analytics), and Google (authentication). Each is subject to its own privacy policy.
To request deletion of your account and associated data, email gvem@duck.com. Account data will be deleted within 30 days.
This policy may be updated at any time. The “last updated” date at the top of this page reflects the most recent revision. Continued use of the Service after changes constitutes acceptance.
Privacy questions or data requests: gvem@duck.com.