ZeroDust

Exit a blockchain completely - transfer 100% of your native gas balance via EIP-7702

ZeroDust is an intent-based exit system that enables users to sweep their entire native gas token balance to exactly zero via EIP-7702 sponsored execution.

The Problem

When users want to fully exit a blockchain, they face an impossible situation:

User has: 0.0008 ETH on Arbitrum
User wants: 0 ETH on Arbitrum (transfer everything to Base)

The Problem:
├── To send ETH, you need ETH for gas
├── If you send all your ETH, you can't pay gas
├── If you keep gas, you can't send all your ETH
└── Result: Small amount always stranded

ZeroDust is the only solution that enables complete chain exits for native gas tokens.

How It Works

1. User connects wallet to ZeroDust
2. User selects source chain and destination (same-chain or cross-chain)
3. User signs ONE authorization (no gas needed)
4. ZeroDust sponsor executes the sweep
5. User receives funds on destination
6. Origin chain balance: EXACTLY ZERO

Supported Sweep Cases

Post-Condition (enforced on-chain): Source balance = exactly 0 wei

Supported Chains

Contract Address (same on all chains): 0x3732398281d0606aCB7EC1D490dFB0591BE4c4f2

ZeroDust is deployed on 26 mainnet chains with EIP-7702 support:

Plus 46 testnets for development.

See contracts/README.md for explorer links.

Project Structure

zerodust/
├── contracts/          # Smart contracts (Foundry)
│   ├── src/
│   │   ├── ZeroDustSweepMainnet.sol   # Production contract
│   │   └── ZeroDustSweepTEST.sol      # Testnet contract
│   ├── script/
│   │   └── DeployMainnet.s.sol        # Mainnet deployment (CREATE2)
│   └── broadcast/                      # Deployment logs
└── docs/

Architecture

Contract Architecture

┌─────────────────────────────────────────────────────────────┐
│                        User's EOA                            │
│                   (EIP-7702 delegated)                       │
│                                                              │
│  ┌─────────────────────────────────────────────────────┐    │
│  │          ZeroDustSweepMainnet (bytecode)             │    │
│  │                                                      │    │
│  │              executeSweep(intent, sig)               │    │
│  │                        │                             │    │
│  │           ┌────────────┴────────────┐                │    │
│  │           ▼                         ▼                │    │
│  │    MODE_TRANSFER (0)         MODE_CALL (1)           │    │
│  │    Same-chain sweep          Cross-chain sweep       │    │
│  │           │                         │                │    │
│  │           ▼                         ▼                │    │
│  │    Transfer to              Call bridge target       │    │
│  │    destination              (callTarget + callData)  │    │
│  │                                     │                │    │
│  └─────────────────────────────────────┼────────────────┘    │
│                                        │                     │
└────────────────────────────────────────┼─────────────────────┘
                                         │
                                         ▼
                          ┌─────────────────────────┐
                          │     External Bridge     │
                          │       (Gas.zip)         │
                          │                         │
                          │   Delivers funds on     │
                          │   destination chain     │
                          └─────────────────────────┘

Security Model

• No admin functions - Immutable after deployment
• No upgradability - What you see is what you get
• Unified SweepIntent - Single signed structure for all sweep types
• Zero balance enforcement - Contract reverts if any balance remains
• ERC-7201 storage - Prevents slot collisions with other EIP-7702 apps
• Immutable sponsors - Stored in bytecode, not storage

Fee Structure

Service Fee: 1% of swept value, with $0.05 minimum and $0.50 maximum.

Total Fee = Gas Reimbursement + Service Fee + Bridge Fee (if cross-chain)

Examples:
- $5 balance → $0.05 fee (1% = $0.05, at min) → User receives ~$4.95
- $10 balance → $0.10 fee (1%) → User receives ~$9.90
- $60 balance → $0.50 fee (max) → User receives ~$59.50

Documentation

• contracts/README.md - Contract details and deployment
• contracts/SPECIFICATION.md - Technical specification
• contracts/DEPLOYMENT.md - Deployment guide

Security

ZeroDust is designed with security as the top priority:

• No fund custody - All operations are atomic, single-transaction
• User-controlled limits - maxTotalFeeWei and minReceive signed by user
• Mandatory simulation - Every transaction simulated before execution
• routeHash binding - Signature bound to specific bridge route (cross-chain)
• Internal security review - 7 rounds, 16 issues identified and fixed
• External audit - Pending (required before full launch)

Status

Smart Contract: Deployed on 26 mainnets + 46 testnets

Contract Versions

Verified Mainnet Sweeps

See contracts/README.md for full deployment list.

Testnets NOT Supporting EIP-7702

The following testnets were tested and do not support EIP-7702:

Abstract, Lens, zkSync, Taiko, opBNB, Avalanche, Swell, Cyber, Boba, Metis, Fuse, Aurora, Flare, Vana, Corn, Rootstock, Apechain, IoTeX, Viction, XDC, Telos, Kava, EDU Chain, Gravity, Manta Pacific, Lightlink, Moonbase, Nibiru, Somnia, Rari, Blast, Xai, B3, Mezo, Chiliz, HashKey, Memecore

Note: Mainnet support may differ from testnet.

Cross-Chain Bridging

ZeroDust supports cross-chain sweeps via the MODE_CALL pattern:

• callTarget: Bridge contract address
• callData: Bridge-specific transaction data
• routeHash: keccak256(callData) - binds signature to specific route

Primary Bridge: Gas.zip - 239+ chains, ~5 second delivery

License

MIT License - see LICENSE

Production deployed on 26 mainnet chains. Contract: 0x3732398281d0606aCB7EC1D490dFB0591BE4c4f2