Campaign Contract

The FoomD2E smart contract is the on-chain backbone of OnlyDancers. It handles the full lifecycle of a dance contest campaign: creation, tier setup, winner payout, and fund withdrawal.

How It Works

1

Create Campaign

Creator calls createCampaign() and deposits USDC. The contract:

• Locks the campaign's tier structure and winner counts

• Stores the creator's address and deposit amount

• Makes the campaign immutable—no tier changes allowed once created

• Begins accepting dancer submissions

2

Tier Rewards Are Immutable

Reward tiers are defined at campaign creation and cannot be changed. The contract stores:

• Explicit tier amounts for top positions (1st Place: $5,000, 2nd Place: $3,000, etc.)

• Fixed winner counts for each tier (1st Place: 1 winner, 4th-10th: 7 winners, etc.)

• A calculated equal share for remaining positions based on pool size

This immutability ensures dancers know exactly what they're competing for when they enter.

3

Send Rewards

After judging, a relayer calls sendRewards() with winner addresses and their positions. The contract:

• Pays out USDC position by position according to the tier structure

• Validates that each position is assigned the correct reward amount

• Prevents accidental or malicious duplicate payouts

4

Double-Payment Protection

Each winner position can only be paid once. If a relayer attempts to pay the same position twice:

• The contract rejects the second payout

• Funds remain locked in the contract

• Admin can manually review and investigate

5

Withdrawal

Creator calls withdraw() to reclaim:

• Unclaimed prize pool dust (remaining USDC after all payouts)

• Unclaimed rewards from winners who never claimed their prize

This ensures no value is locked in the contract indefinitely.

Commission Structure

OnlyDancers takes no on-chain commission. The full prize pool goes to winners. Platform revenue comes from creator deposits and entry fees collected off-chain via Stripe.

Every USDC token deposited by creators and earned from dancer entry fees flows directly into the prize pool. The smart contract does not deduct any fees or percentages—100% of funds are available for payouts.

Security

The FoomD2E contract implements multiple security measures:

UUPS Upgradeable Admin can upgrade the contract logic without losing state, enabling bug fixes and feature additions.

Role-Based Access Control

• Admin: Deploys campaigns, approves relayers, withdraws unclaimed funds

• Relayer: Posts winner lists after judging, triggers payouts

Token Whitelisting Only approved tokens (USDC on Ethereum mainnet) can be used for campaigns. This prevents accidental use of incorrect token contracts.

Always verify the contract address and token address before sending USDC. Scammers may create fake contracts—only use official links from onlydancers.fun.

Contract Deployment

• Network: Ethereum Mainnet

• Token: USDC (0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48)

• Pattern: UUPS Proxy for upgradeable logic