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
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 ✓"). |
|
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
- The player sends $CHOG from their own wallet (a normal ERC-20 transfer on Monad).
- The browser waits for the transaction and sends only its hash to the server.
- 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).
- 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 |
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:
- Open the League tab: the Hall of Champions shows last week's champion, the prize and the amount to burn.
- Send the prize to the champion Chog's owner, and the burn amount to
0x000000000000000000000000000000000000dEaD.
- 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.
