Chog League

Your Chog is a trading account. Call crypto prices higher or lower, level up on skill,
duel other holders, and win the weekly $CHOG prize.

▶ Play free · 🎬 Demo video (2:40) · Built for Chogathon 2026 on Monad

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What it is

Pick a market (BTC, ETH, SOL or MON), call HIGHER or LOWER over 1 to 5 minutes, set your stake and a payout multiplier, and watch the live price. Every call settles on real Coinbase prices at the close of the 1-minute candle when it expires. Trading uses demo money, so a bad call never costs real funds.

The twist: everything is saved to the Chog's token ID, never the wallet. Its level, record, weekly crowns and cosmetics travel with the NFT. Sell your Chog and the buyer gets a proven trader.

Why the Chog is essential

• The Chog is the account. League play, levels, league duels and the crown only exist for a Chog, and only its owner can play it. Ownership is re-checked on Monad (ownerOf) before every trade.
• Its level is proof of skill. The odds are fair at every multiplier (see below), so luck cancels out over time and a Chog's level (wins minus losses) is a skill score.
• No two Chogs play the same. Each Chog's own traits decide its gameplay:
  • Home market from its Background: +1x multiplier limit when trading that market.
  • Daily power from its Eyes: 🛡️ Shield (a loss doesn't drop its level), 🔥 Double Up (a win counts twice) or 🪂 Parachute (half the risk, half the profit). All keep the odds fair.
• The Chog reacts. It bounces with confetti on a win, shakes and greys out on a loss, burns on a hot streak, frosts on a cold one, and wears a 👑 as the league's number one.

Anyone can try it in Practice mode with any Chog and no wallet. Practice never counts toward records or the league.

Screenshots

_{Screens from a test copy with example data (balances, prizes and players are made up).}

Features

📈 Calls	Higher or lower on BTC, ETH, SOL or MON · 1, 2, 3 or 5 minutes · stake $1–$500 · multiplier 1x–5x · up to 5 open at once · cash out any time before the last 10 seconds for what the call is worth right now (2% exit fee; counts as neither a win nor a loss for the level)
🧭 Guided start	A 47-second "How to play" clip on the home page, then a step-by-step guide that lights up each control and walks a first call. Replay it any time with "Show me how".
📊 Live chart	Your Chog rides the price, glowing green when winning and red when not. Shaded win zone, entry and target lines, a 🏁 finish-flag countdown, "winning! / needs +$X" under the chart, and a LIVE · Prices by Coinbase badge.
📸 Share cards	Every finished call makes an image of your Chog with a WIN or REKT stamp, a funny line and the result. Share, save or post on X. Built on the server from the saved trade, so it can't be faked.
📜 History	Every call and duel a Chog has played: hit rate, net, best win, worst loss, favourite market, filters, and each duel's opponent and score. The league history belongs to the token, so anyone can check it.
⚔️ Duels	Chog vs Chog. See who's online and challenge them. Quick, best of 3 or best of 5 (hidden picks, 20-second window), or Arenas of 15 min, 1 hour or 24 hours. Equal demo stakes, winner takes the pot. Practice players can duel a bot.
👑 Weekly league	Every Monday 00:00 UTC every Chog restarts at $1,000 demo. Highest balance wins the crown, the $CHOG prize and a place in the Hall of Champions. Daily streaks and power recharges.
🎲 Practice board	Anyone playing Practice (no wallet) gets a weekly board too: "Player ab12" with the Chog they used, ranked by practice balance after 3 finished calls. Just for fun, no prize, never touches a Chog's record.
🪪 Levels	Rookie (1.5x) → Trader (2x, 5 net wins) → Sharp (3x, 15) → Shark (4x, 30) → Legend (5x, 50)
✨ $CHOG shop	Titles (250), profile frames (500) and victory animations (1,000 $CHOG). Looks only, saved to the Chog. Free try-on.
🏆 Prize pot	2,000 $CHOG base + 70% of the week's shop sales + everything chipped in. The other 30% of sales is burned. Payouts and burns are linked on-chain ("Paid ✓", "burned ✓").
💜 Holders	Wallets with 10,000+ $CHOG get a holder badge on their Chogs and 20% off in the shop.
💝 Chip in & tips	Anyone can add $CHOG to the weekly prize, or tip the reigning champion directly.
🎵 Sound	Original sound effects and background music, made in code.

How the odds stay fair

A bigger multiplier pays more, but the target price moves further away, so the chance of winning shrinks to match. For a multiplier m, the target is set so that:

win chance ≈ 1 / (1 + m)
target     = entry × (1 ± z(m) · σ · √minutes),   z(m) = inverse normal of m / (1 + m)

where σ is the market's recent 1-minute volatility. At 1x it's a coin flip; at 5x it's 1 in 6. Every setting has the same expected value, so no option is a better deal and only good reads move a Chog up the levels. The rules live in src/lib/game.ts.

How $CHOG payments work

1. The player sends $CHOG from their own wallet (a normal ERC-20 transfer on Monad).
2. The browser waits for the transaction and sends only its hash to the server.
3. The server reads the receipt from Monad and checks the Transfer log: right token, sent from the signed-in wallet, to the right address, at least the right amount (src/lib/payments.ts).
4. Each transaction hash can be used once, across the shop, chip-ins and tips.

Trading and duels never use real money. $CHOG rewards play and is never gambled.

Tech stack

• Next.js 15 (App Router, TypeScript, Tailwind CSS v4)
• wagmi v2 + viem with a browser wallet; sign-in is a free signed message (no transaction)
• Monad mainnet: Chog Genesis NFT 0xc96d31F8626c6D03Fae5dCD3d61e3FB9F4a73763 · $CHOG 0x350035555E10d9AfAF1566AaebfCeD5BA6C27777
• Supabase (Postgres) for trades, duels, purchases and the league; falls back to a local JSON file for development
• Coinbase public API for live prices and 1-minute candles (server-side only)
• Hosted on Vercel

Project structure

Path	What's there
src/lib/game.ts	Game rules: markets, multipliers, fair targets, levels, weekly balance
src/lib/identity.ts	Home market and daily power, read from each Chog's traits
src/lib/duels.ts	Duel formats, rounds, arenas and settlement
src/lib/shop.ts	Shop items, prices, prize pot, holder discount (all numbers in one place)
src/lib/payments.ts	On-chain $CHOG payment checks
src/lib/prices.ts · settle.ts	Live prices and settling expired calls
src/lib/store.ts	Database (Supabase, or a local file)
src/app/api/	Server endpoints: trade, duels, league, champions, history, share cards, shop, chip-in, tips, sign-in
src/components/	Screens: trade panel and live chart, first-call guide, Chog card and history, duels, leaderboard, shop, share cards
src/lib/result-card.tsx	The share-card image for a finished call
supabase/schema.sql	Database tables (safe to run more than once)
scripts/make-music.ts	Generates the original background music

Run it yourself

You need Node.js LTS. On Windows, open the folder in VS Code and use Terminal → New Terminal.

git clone https://github.com/Guzman0/chog-league.git
cd chog-league
npm install
npm run dev

Then open http://localhost:3000. Without any settings, trades are saved to a local file in data/.

Settings

Copy .env.example to .env.local and fill in what you need:

Variable	Needed for
SUPABASE_URL, SUPABASE_SECRET_KEY	Saving to Supabase instead of a local file (run supabase/schema.sql once in the SQL Editor)
SESSION_SECRET	Signing sign-in cookies (required on Vercel; any long random string)
NEXT_PUBLIC_RPC_URL	A different Monad RPC (defaults to https://rpc.monad.xyz)
CHOG_FAKE_PRICES=1	Local testing without internet: made-up prices (ignored on Vercel)

Never commit .env.local; it's already ignored by git.

Running the weekly prize

Each Monday after the reset:

1. Open the League tab: the Hall of Champions shows last week's champion, the prize and the amount to burn.
2. Send the prize to the champion Chog's owner, and the burn amount to 0x000000000000000000000000000000000000dEaD.
3. In Supabase → Table Editor → payouts, add a row: week = the Monday the finished week started (e.g. 2026-10-19), paid_tx and burn_tx = the two transaction hashes. The "Paid ✓" and "burned ✓" links appear within a few minutes.

Credits

Built solo by Guzman (@the_first_guz) for Chogathon 2026, with Claude Code. Chog art and traits come from the Chog Genesis collection's own metadata. Fan-made for the hackathon; not an official Chog product.

Code released under the MIT License. Chog artwork belongs to its owners and is not covered by this licence.