Legal & Privacy

Last updated: 20 September 2026

Plain-language summary. This is a free hobby tool with no server and no accounts. Nothing you do here is sent to us, because there is no "us" to send it to — everything runs in your browser. You supply your own AI provider key, and your league data is sent to whichever AI provider you choose. The AI is frequently wrong. Do not bet money based on it.

1. Disclaimer

Not affiliated with Sleeper. This project is an independent, unofficial tool. It is not affiliated with, endorsed by, sponsored by, or approved by Sleeper, Blitz Studios Inc., or any of their affiliates. "Sleeper" and related marks belong to their respective owners.

Not affiliated with the NFL. This project is not affiliated with, endorsed by, or approved by the National Football League, the NFL Players Association, or any NFL club. NFL team names, logos, and player names are the trademarks of their respective owners and are used here only for identification and commentary.

AI output is unreliable. The insights, rankings, forecasts, and start/sit advice on this site are generated by large language models. They routinely produce confident, plausible-sounding, and entirely incorrect statements, including invented injuries, stale rosters, and fabricated statistics. Treat every output as an unverified opinion, not a fact. Verify anything that matters against a primary source before acting on it.

Not betting or financial advice. Nothing here is gambling advice, betting advice, investment advice, or a prediction of any real-world outcome. No result is guaranteed. If you wager money on fantasy sports, you do so entirely at your own risk and are responsible for complying with the laws of your jurisdiction.

Entertainment use only. This tool is provided for informational and entertainment purposes.

2. Privacy Notice

There is no backend

This site is a single static page hosted on Cloudflare Pages. It has no server-side code, no database, no user accounts, no login, no analytics, no advertising, and no tracking cookies. The operator of this site does not receive, collect, store, or have any technical means of seeing what you type into it or which leagues you look at.

What is stored, and where

The following are stored in your own browser's localStorage on your own device. They are never transmitted to the site operator:

Your AI provider API key — stored unencrypted, so that you do not have to re-enter it.
Cached AI responses — kept for up to 30 minutes so that repeating the same request does not bill you twice.
Cached NFL player data — kept for up to 24 hours to reduce load on the Sleeper API.
Your chosen provider and model.

Your API key is readable by anyone with access to this browser profile. localStorage is not a secure vault. Do not use this tool with a key you cannot afford to rotate, do not use it on a shared or public computer, and prefer a key with a low spending cap. Use the Clear Key button in Settings when you are finished.

Third parties your browser contacts directly

Sleeper API (api.sleeper.app, sleepercdn.com) — to read the public league, roster, matchup, and player data for the username you enter. Sleeper will see your IP address.
The AI provider you select — Google Gemini, Groq, OpenAI, or Anthropic. When you run an AI feature, your browser sends that provider your API key plus the relevant league context: team names, rosters, player names, scores, and standings. Your use of each provider is governed by that provider's own terms and privacy policy, not this one.
Cloudflare Pages — the host. Cloudflare may log your IP address and request metadata as part of serving the page. See Cloudflare's privacy policy.

Free AI tiers may train on your data. Free-of-charge API tiers commonly reserve the right to use submitted prompts and responses to improve the provider's models — Google states this for unpaid use of the Gemini API. If you do not want league data used that way, use a paid tier or a provider whose terms say otherwise. Check your provider's current terms; they change.

Deleting your data

Click Clear Key in Settings to remove your stored key and cached AI responses. To remove everything, clear this site's data in your browser settings. Because nothing is stored off your device, that is a complete deletion — there is no copy elsewhere to request.

Children

This site is not directed at children under 13 and no personal information is knowingly collected from anyone.

3. Terms of Use

By using this site you agree to these terms. If you do not agree, do not use it.

The service

The site is provided free of charge, as a personal hobby project, with no service-level commitment. It may change, break, or be withdrawn at any time without notice.

Your API key and costs

You bring your own AI provider key and you are solely responsible for all charges your provider bills you, including charges arising from misuse, from a key stolen off your device, or from unexpected usage. You are responsible for setting your own spending limits with your provider. The operator of this site has no access to your provider account and cannot refund, reverse, or cap any charge.

Acceptable use

Do not use this site to break the law, to violate the terms of Sleeper or of any AI provider, to scrape or overload any third-party API, or to harass anyone.

No warranty

THE SITE IS PROVIDED "AS IS" AND "AS AVAILABLE", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, AND NON-INFRINGEMENT.

Limitation of liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE OPERATOR SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR EXEMPLARY DAMAGES, OR FOR ANY LOSS OF PROFITS, DATA, GOODWILL, API CREDITS, OR FANTASY LEAGUE STANDINGS, ARISING OUT OF OR IN CONNECTION WITH YOUR USE OF THIS SITE.

Changes

These terms may be updated. The "last updated" date above will change when they are. Continued use after a change means you accept it.

Governing law

These terms are governed by the laws of the State of Texas, United States, without regard to its conflict-of-law rules.

4. Contact

Questions about this notice: shahed.k123@gmail.com. Source code and issue tracker: github.com/sk193/sleeper-backdoor.