Waste2Wealth

Inspiration

Walking past the same pile of garbage for two weeks straight made us ask, why does nobody clean this? The answer was simple: there's no incentive.

Existing apps like SeeClickFix have <5% completion rates. Reports go in, nothing comes out. We wanted to fix that with crypto rewards and community accountability.

What it does

Waste2Wealth is a mobile app where you earn Solana crypto for cleaning your city. Snap a photo of garbage → someone nearby claims it and cleans it → the community votes it's real → everyone gets paid automatically on-chain.

Every photo is verified by Cloudinary AI. Every account is gated by World ID. No fakes. No bots. Just cleaner streets and real rewards.

Reporter: 0.01 SOL · Cleaner: 0.10 SOL · Verifier: 0.005 SOL each

How we built it

• React Native (Expo): mobile-first, single codebase, no web companion
• Cloudinary AI Vision: natural language prompts verify every photo ("Is there actual garbage here?", "Has it been cleaned?")
• World ID (IDKit): one real human = one account, cryptographically enforced
• Solana devnet: micro-payments with near-zero fees
• Supabase + PostGIS: real-time map pins and geo-based push notifications
• FastAPI: backend consensus engine, reward distribution, geofence routing

Challenges we ran into

• World ID on React Native: IDKit's bridge API has changed multiple times across versions; required real-device testing before writing a single screen
• Cloudinary AI Vision quota: 2–3 API calls per report burns through the free trial fast; had to mock Vision in dev and save live calls for the demo
• Solana polyfills in Expo: @solana/web3.js needs 3 specific polyfills in index.js or the wallet silently fails on device with no error
• GPS drift indoors: had to loosen the proximity check from 50m → 200m for the hackathon venue

Accomplishments that we're proud of

• Built a full 3-sided crypto economy in 36 hours that's actually cheat-proof
• Cloudinary AI Vision acts as a transparent trust layer: the AI's reasoning is published in-app, not hidden in a black box
• 5 distinct Cloudinary surfaces in one mobile app: AI Vision, Envision Clean, comparison slider, background removal, auto-tagged gallery
• Zero fake accounts possible: World ID makes the whole economy viable

What we learned

• Crypto micro-payments only work at scale on Solana, Ethereum gas fees would exceed the reward itself
• The hardest part of any incentive system isn't the reward, it's the anti-cheat
• Cloudinary AI Vision answering questions in plain English is a fundamentally better trust story than any on-device ML model we could have shipped

What's next for Waste2Wealth

• City partnerships: municipalities pay into the reward pool instead of spending $500M/year on cleanup crews
• Reputation leaderboards: top cleaners get featured, building civic identity
• World Chain deployment: move escrow on-chain for full decentralization
• Carbon credit integration: every verified cleanup generates a tokenized carbon offset, adding a second revenue stream for cleaners

Built With

• cloudinary
• react-native
• solana
• supabase
• world-u