Banter never asks for your ESPN, Yahoo or Sleeper login, password or cookies. You copy your roster from the platform and paste the text here. We read the pasted text once to find your players and keep only the players it matched, not the text itself.
Your browser asks Sleeper for your own roster (read only). Banter's servers never contact Sleeper, never see your Sleeper username or league name, and receive only the player ids on your team. If you keep Re-sync on, this device remembers your Sleeper user id (which Sleeper can turn back into your username) and Banter keeps the league id; Disconnect removes both. Banter never asks for your Sleeper password.
Check your roster
We did not find any players in that text. Check you copied the roster list.