Gen-Z financial-habits betting app, built at the 8x hackathon (event).

Friends put real money (simulated as integer pence) into a shared pot and bet it on sticking to their own budget. Hold your goal — you keep your stake. Break it — your stake redistributes live to the friends who held. The bet is resolved automatically by transaction data, never by a human: the bank is the referee.

On two phones, when one person's spending crosses their budget cap, their stake visibly slides across to the other person in real time, with a haptic. Drive it from the Pot screen's dev row: "Add £30 cafe (Tom)" pushes Tom from £96 → £126, auto-breaks his bet, and pays his stake to Maya.

Expo SDK 56 · React Native 0.85 · TypeScript · Expo Router (file-based, src/app) · Supabase (Postgres + Realtime) · react-native-reanimated v4 · expo-haptics.

npm install
npx expo start

Scan the QR with Expo Go on a real phone (iOS/Android). For the cross-device demo, open it on two phones — the realtime payout slide fires on both. Use the toggle chip (top-right of the Pot screen) to switch between Maya and Tom, or run each account on a separate phone.

• Pot (home) — member tiles, live bet-health bars, pot total, live feed, check-in, and the payout slide. Dev row drives the demo.
• Buckets — 50/30/20 split tuned by archetype; the staked category shows live bet status.
• Coach — rule-based "stake at risk" nudges (fire at 80% of cap) and a projection.
• Squad — leaderboard ranked by who's holding and what they stand to win (never by income).

• src/lib/logic.ts — the referee. recordTransaction (the only thing that can break an under/nospend bet), breakBet (idempotent, redistributes the stake), resolveWindowEnd (scheduled settlement).
• src/hooks/usePotRealtime.ts — one realtime channel per pot; patches pot_members (bet-health bars + payout) and events (feed) optimistically.
• Money is integer pence everywhere — no floats.

• Open RLS policies (anon can read/write everything) are for the hackathon demo ONLY. Do not ship.
• No auth, no KYC, no real payments — stakes are simulated pence.
• Supabase anon key is committed for demo convenience; rotate before any real use.