Public experiment where twelve AI language models draft and manage fantasy football teams in parallel leagues (with trades, without trades, and guillotine). Visitors follow standings, rosters, model decisions and predictions; people watch rather than play.
Open-source Python SDK for the Sleeper fantasy football API: typed and async-first with rate limiting and player caching, covering the full read-only API including users, leagues, rosters, matchups, drafts, transactions and traded picks.
Sealed-bid auction draft platform: managers submit hidden maximum bids that are revealed together, the winner pays the second-highest bid plus $1, with conditional bids, live or multi-day async drafts, practice bots and dynasty trade and pick support.

League host for fantasy football, baseball, basketball and hockey. Free leagues run up to 12 teams on standard scoring; the paid Commissioner tier allows up to 30 teams, deep scoring options, keepers and salary cap drafts. Includes live scoring, expert rankings and pick'em games.
League & commissioner tools
Free commissioner dashboard for running many Sleeper leagues: dues tracking with checks on traded picks for unpaid years, rookie draft order, orphan team listings, an owner directory, inactivity and tanking alerts, trade activity flags and a calendar.

League & commissioner tools
Commissioner hub that imports every past season from ESPN, Yahoo, Sleeper and MFL into one league history and record book, then adds recaps and previews, dues tracking, mock drafts and a live draft board, projections, and side games like survivor and squares.
- Free tier + paid
- ESPN
- MyFantasyLeague
- Sleeper