Sign in to keep your leagues synced across devices.
One username finds every league on your Sleeper account.
The ID is the number in your league's URL. Private leagues connect too; you'll be asked for two cookies.
That league is private, so ESPN needs proof you belong to it: two cookies from your own ESPN session. They stay in this browser and are relayed straight to ESPN, never stored on our side.

Every league you've connected, one glance each. Open one to make it the active league everywhere.
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