Sweat Market

After editing your profile
Chat page
Home page after signing in
creating profiile
Sign up page
Wallet
Home page before signing up
Coin Exchanging
QR code
after scanning (scanned id comes out)

Inspiration

We mashed two worlds that rarely meet: the social spark of working out together and the gameful incentives of a market. Fitness apps often lose steam without friends; markets make tiny actions feel meaningful. We asked: what if meeting for a run felt like unlocking a quest reward—and you could trade that effort? That became SweatMarket.

What it does

Find partners: Profiles with sport, time window, and region; browse posts/offers; DM to coordinate.
Verify meetups: Host shows a QR, partner scans; both devices send GPS. Success if within 100 m and 120 s.
Earn coins: On verification, both users receive FitCoin and a wallet transaction is recorded.
- Reward formula (Markdown + LaTeX):
  $$\text{FitCoin}=\left\lfloor\frac{t\cdot\iota}{10}\right\rfloor + 10\cdot \mathbf{1}_{\text{verified}}$$ where (t) = workout minutes, (\iota\in{1,2,3}) = intensity bucket.
Play the market: Lightweight DEX-style page to post buy/sell orders for FitCoin (toy economy; no real money).
See history: Wallet balance + transaction list.

How we built it

Stack: FastAPI + SQLModel/SQLite + Uvicorn, Jinja2 templates, Tailwind CSS.
Auth & sessions: Starlette SessionMiddleware; simple username/password.
Data model: users (coins), txs (wallet ledger), orders (orderbook), plus posts, comments, chat_rooms, messages.
Endpoints: /signup, /login, /wallet, /dex (+ /dex/new), and / landing.
Demo mode for speed: Toggle via SWEATMARKET_DEMO=1 or ?demo=1 to seed fake orders and wallet so UI works even when other modules are unfinished. Soft-imports prevent crashes while teammates iterate.

Challenges we ran into

Concurrency & merges: Multiple people touching templates/models → conflicts. We used frequent rebases, one-owner policy for shared files, and small PRs.
Schema churn: Adding users.coins mid-sprint required a tiny migration or dev DB reset.
Anti-cheat vs. simplicity: Balanced realism with QR + 100 m geofence instead of heavy sensor attestation.
Scope control: Built a post-only orderbook (no matching engine) to hit the 12-hour MVP.

Accomplishments that we're proud of

End-to-end meet → verify → earn → trade loop shipped within the hackathon window.
Demo mode kept momentum when other parts weren’t ready.
Clean, responsive UI with a sticky header and consistent context (passing user into base.html).
QR + geo verification that feels real without complexity.

What we learned

Decoupled modules win hackathons. Feature flags and demo data unblock UI/UX early.
Pass context early (e.g., user into base.html) to prevent template drift.
Keep tiny migrations or be ready to recreate SQLite locally.
Rebase + --force-with-lease and clear ownership make teamwork smooth.