ZeroDust Chain Exit

ZeroDust enables sweeping native gas tokens to exactly zero balance using EIP-7702 sponsored execution. This only works on chains that support EIP-7702 (not all EVM chains).

When to Use This Skill

Activate when the user wants to:

• Fully exit a blockchain (move all native tokens out)
• Sweep dust/small balances from wallets
• Transfer 100% of their balance with zero remainder
• Empty a wallet completely
• Consolidate funds from multiple chains

Trigger Phrases

• "exit this chain completely"
• "transfer all my balance from [chain]"
• "sweep my dust"
• "empty this wallet"
• "move everything to [chain]"
• "leave zero balance"

Supported Chains (25 EIP-7702 Compatible)

Chain	ID	Native Token
Ethereum	1	ETH
BSC	56	BNB
Base	8453	ETH
Arbitrum	42161	ETH
Optimism	10	ETH
Polygon	137	POL
Gnosis	100	XDAI
Scroll	534352	ETH
Zora	7777777	ETH
Mode	34443	ETH
Mantle	5000	MNT
Celo	42220	CELO
Fraxtal	252	FRAX
Unichain	130	ETH
World Chain	480	ETH
Berachain	80094	BERA
Ink	57073	ETH
Plasma	9745	XPL
BOB	60808	ETH
Story	1514	IP
Superseed	5330	ETH
Sei	1329	SEI
Sonic	146	S
Soneium	1868	ETH
X Layer	196	OKB

Note: Chains like Avalanche, Blast, Linea, and Apechain do NOT support EIP-7702 and cannot be swept.

API Base URL

https://zerodust-backend-production.up.railway.app

Step 1: Register for API Key (One-Time)

curl -X POST https://zerodust-backend-production.up.railway.app/agent/register \
  -H "Content-Type: application/json" \
  -d '{
    "name": "My OpenClaw Agent",
    "agentId": "openclaw-unique-id"
  }'

Response:

{
  "apiKey": "zd_abc123...",
  "keyPrefix": "zd_abc12",
  "keyId": "uuid",
  "keyType": "agent",
  "rateLimits": { "perMinute": 300, "daily": 1000 },
  "message": "IMPORTANT: Save your API key now - it will not be shown again!"
}

Store apiKey as the ZERODUST_API_KEY environment variable.

Step 2: Get Quote

Check the user's balance and fees before sweeping:

curl "https://zerodust-backend-production.up.railway.app/quote?userAddress=0xUSER&fromChainId=42161&toChainId=8453&destination=0xDEST"

Response:

{
  "quoteId": "uuid",
  "fromChainId": 42161,
  "toChainId": 8453,
  "userAddress": "0x...",
  "destination": "0x...",
  "balance": "500000000000000",
  "balanceFormatted": "0.0005",
  "estimatedReceive": "485000000000000",
  "estimatedReceiveFormatted": "0.000485",
  "totalFeeWei": "15000000000000",
  "serviceFeeWei": "5000000000000",
  "gasFeeWei": "10000000000000",
  "expiresAt": "2026-02-04T16:00:00Z"
}

Step 3: Get Authorization Data

Get the EIP-712 typed data for signing:

curl -X POST https://zerodust-backend-production.up.railway.app/authorization \
  -H "Content-Type: application/json" \
  -d '{"quoteId": "uuid-from-quote"}'

Response contains typedData (EIP-712 for sweep) and eip7702 (delegation parameters).

Step 4: User Signs Messages

The user must sign:

1. EIP-7702 delegation authorization - Delegates their EOA to ZeroDust contract
2. EIP-7702 revoke authorization - Pre-signed revocation (executed after sweep)
3. EIP-712 sweep intent - Authorizes the specific sweep parameters

Step 5: Submit Sweep

curl -X POST https://zerodust-backend-production.up.railway.app/sweep \
  -H "Content-Type: application/json" \
  -d '{
    "quoteId": "uuid",
    "delegationSignature": "0x...",
    "revokeSignature": "0x...",
    "sweepSignature": "0x..."
  }'

Response:

{
  "sweepId": "uuid",
  "status": "pending",
  "txHash": null
}

Poll GET /sweep/{sweepId} for status updates until status: "completed".

Convenience Endpoint: Combined Quote + Auth

For agents, use this single endpoint to get quote and auth data together:

curl -X POST https://zerodust-backend-production.up.railway.app/agent/sweep \
  -H "Content-Type: application/json" \
  -H "X-API-Key: $ZERODUST_API_KEY" \
  -d '{
    "fromChainId": 42161,
    "toChainId": 8453,
    "userAddress": "0x...",
    "destination": "0x..."
  }'

Batch Sweeps (Multiple Chains)

Sweep from multiple chains in one request:

curl -X POST https://zerodust-backend-production.up.railway.app/agent/batch-sweep \
  -H "Content-Type: application/json" \
  -H "X-API-Key: $ZERODUST_API_KEY" \
  -d '{
    "sweeps": [
      {"fromChainId": 42161},
      {"fromChainId": 10},
      {"fromChainId": 137}
    ],
    "destination": "0x...",
    "consolidateToChainId": 8453
  }'

Fees

• Service fee: 1% of balance (min $0.05, max $0.50)
• Gas costs: Paid by ZeroDust, reimbursed from sweep amount
• User receives: ~97-99% of balance (varies by gas prices)

Rate Limits

• Agent keys: 300 requests/minute, 1000 sweeps/day
• Contact ZeroDust for higher limits

Error Codes

Error	Meaning
BALANCE_TOO_LOW	Balance below minimum (~$0.10)
QUOTE_EXPIRED	Quote older than 5 minutes
CHAIN_NOT_SUPPORTED	Chain doesn't support EIP-7702
INVALID_SIGNATURE	Signature verification failed
RATE_LIMIT_EXCEEDED	Daily or per-minute limit hit

Example Agent Conversation

User: "I want to move all my ETH from Arbitrum to Base"

Agent:

1. Call /quote to check balance and fees
2. Show user: "You have 0.005 ETH on Arbitrum. After fees (~1%), you'll receive ~0.00495 ETH on Base. This requires signing 3 messages. Proceed?"
3. If yes, call /authorization to get typed data
4. Request wallet signatures (EIP-7702 delegation, revoke, and EIP-712 sweep)
5. Submit to /sweep with signatures
6. Poll status until complete
7. Confirm: "Done! Your Arbitrum balance is now exactly 0. 0.00494 ETH received on Base."

Important Notes

1. EIP-7702 Required: User's wallet must support EIP-7702. Most modern wallets do as of 2026.

2. Signatures Required: Sweeps require user wallet signatures. ZeroDust never has custody.

3. Zero Balance Result: After sweep, source chain balance is EXACTLY zero.

4. Cross-Chain: Sweeps can go to any supported destination chain via Gas.zip bridging.

5. Not All EVM Chains: Only the 25 chains listed above support EIP-7702. Do not attempt sweeps on unsupported chains.