NBA Over/Under Draft
Snake-draft NBA season win totals (team + OVER/UNDER) with friends, live over the internet.
- Any number of players. All 60 sides (30 teams × over/under) go into the pool, and the same team can be drafted twice (once for each side).
- Snake draft with an optional pick timer. When the clock runs out, it auto-picks the top suggestion.
- Live lines before the draft. Lines are a built-in sportsbook consensus that you can edit or bulk-paste, plus live Polymarket prices. Everything locks when the draft starts.
- Suggested picks. Ranked by expected points, with a flag on picks that "won't last to your next pick".
- Scoring: a pick scores the number of wins its team finishes beyond the line, in its direction. A miss scores negative (default) or zero.
- In-season projections from ESPN records, a projected leaderboard, and a daily chart.
- Trades of drafted picks, with accept/decline. The commissioner can veto.
- Draft board, teams table (line value tracking), activity log, and past-season archives.
- Join with a room code, display name, and PIN. The PIN gets you back in on any device.
Deploy (free, about 5 minutes)
- Push this repo to GitHub.
- At vercel.com → Add New → Project, import the repo, then click Deploy. No settings needed.
- In the Vercel project, open Storage → Create Database → Upstash (Redis) → Free plan, and connect it to the project.
This adds the
KV_REST_API_URL / KV_REST_API_TOKEN env vars automatically.
- Go to Deployments → ⋯ → Redeploy so the app picks up the database.
- Open
https://<your-project>.vercel.app, create a room, and share the invite link.
Everything runs on free tiers: Vercel Hobby, Upstash free, ESPN's public standings feed, and Polymarket's public API.
Local dev
npm install
npm run dev # stores data in .data/store.json when no Redis env vars are set
npm test
How the numbers work
- Projection: wins so far + remaining games × a pace that blends the actual win% with the line's pace (the line counts as 50 games of evidence).
- Market lean: the sportsbook's no-vig over probability, averaged with Polymarket's price (converted to the book's line) when that market has real volume.
- Suggestions: expected points of each open side under the room's scoring mode, using the projection nudged by the market lean.
- Built-in lines live in
lib/teams.js (SEED_LINES). Update them there, or in the Commish tab before drafting.
