Your league
What we read and what we keep
Sleeper: Sleeper's public read-only API. Your username finds your leagues; nothing else is needed. Sleeper offers the API free for non-commercial use.
ESPN: public leagues only. If yours is private, your commissioner can turn on “Make league viewable to public” in ESPN's league settings, or you can paste your roster. We don't use ESPN cookies or logins.
Fantrax: Fantrax's read-only league API, using the league id from your league's web address.
Yahoo and everyone else: Yahoo isn't letting new apps read leagues right now, so copy your roster from the Yahoo app or site and paste it. We read the names and ask you when a name could be more than one player.
We keep the platform, your league id, which team is yours and the league name on this device, and in your account if you're signed in. We also note on our side which league and team this browser connected (never your username or password) so we can count how the tool is used. Rosters are re-read when you open a tool, at most every 10 minutes.