Float

Deposit USDC. Earn yield. Battle with your upside. Never risk your deposit.

The Problem

DeFi yields exist but nobody uses them -- the UX is hostile. Prediction markets exist but people risk real money. No product combines passive earning with risk-free engagement where you can only play with what you've already earned.

How It Works

1. Deposit USDC -- Your money is supplied to MORE Markets (Aave V3 fork on Flow) and starts earning 4%+ APY immediately.

2. Yield accumulates -- Interest compounds automatically via Flow's native scheduled transactions. No keepers, no bots.

3. Battle with yield -- Wager your earned interest on daily predictions (crypto prices, sports, events). Only yield is at risk. Your deposit is always safe.

4. Win and compound -- Winnings are added to your principal, so they earn yield too. Losing just means your yield goes to winners.

Why Flow

Float uses every Flow-native feature that makes consumer DeFi possible:

• Passkeys (FLIP-264) -- One-tap signup with Face ID/fingerprint. No seed phrase, no wallet extension.
• Gas sponsorship -- Three-role transaction model means users never see gas fees.
• Scheduled transactions -- Protocol-level cron jobs for auto-compounding and battle resolution. No keepers needed.
• Cross-VM (Cadence + EVM) -- Cadence handlers call Solidity contracts via COA for best of both worlds.

Architecture

Frontend reads from EVM via viem (public client). Frontend writes go through Cadence -> COA -> EVM (FCL.mutate).

Tech Stack

Layer	Technology
Frontend	React, Vite, Tailwind CSS, FCL
Auth	WebAuthn passkeys (FLIP-264)
Contracts (EVM)	Solidity 0.8.20, Foundry
Contracts (Cadence)	FlowTransactionScheduler handlers
Yield	MORE Markets (Aave V3 fork on Flow)
Oracle	Band Protocol on Flow
Gas	Flow native sponsorship

Live Demo

Testnet app: [coming soon — deploy to Vercel]

Deployed contracts (Flow EVM Testnet):

Contract	Address
FloatVault	0x65aA2d8aa386758CE4032E1628D80F6d4CF8EbbC
BattlePool	0x807E68C074D761a0617cCDF2E61Db146F0a79Aad
MockUSDC	0x5308C7C3f9A5D5242C9462B10C927AD73Cd7E7eE

Cadence contracts: deployed to 0xf865549035cf159a on Flow Testnet.

Quick Start

# Install dependencies
npm install

# Run Solidity tests (19/19 passing)
cd contracts && forge test

# Start frontend (testnet)
npm run dev

Contracts

FloatVault.sol -- Core vault managing user deposits and yield tracking:

• deposit(amount) -- Supply USDC to lending pool, track principal
• withdraw(amount) -- Withdraw principal (protected against battle underfunding)
• yieldOf(user) -- Calculate available yield (pro-rata, minus locked amounts)
• lockYield/unlockYield -- Battle pool integration for wagering
• creditWinnings -- Add battle winnings to principal (compound effect)

BattlePool.sol -- Prediction battle system:

• createBattle(...) -- Oracle-resolved crypto battles
• createEventBattle(...) -- Admin-resolved event battles
• enter(battleId, side, amount) -- Wager yield on YES or NO
• resolve(battleId, actualPrice) -- Auto-resolved via scheduled handler
• claim(battleId) -- Winners collect proportional payout (5% protocol fee)

19/19 Foundry tests passing.

Revenue Model

• 5% of losing side on every battle
• Yield spread -- 0.33% between protocol rate and user rate
• Premium battles (V2) -- sponsored battles with larger pools

Project Structure

float/
|-- src/                      # React frontend
|   |-- components/           # UI components
|   |-- config/               # Flow + viem config
|   '-- lib/                  # Passkey auth, transactions, ABIs
|-- contracts/                # Foundry project
|   |-- src/                  # FloatVault.sol, BattlePool.sol
|   |-- test/                 # 19 tests
|   '-- script/               # Deployment scripts
|-- cadence/
|   |-- contracts/            # Scheduled tx handlers
|   |-- transactions/         # COA setup, deployment, scheduling
|   '-- scripts/              # Read helpers
'-- flow.json                 # Flow project config

License

MIT