ZeroDust

Empty a wallet's native gas balance on an EVM chain to exactly 0.

A normal transfer cannot send a whole native balance, because paying for the transfer uses the token being sent. ZeroDust sends all of it, to any address on the same chain or bridged to another chain, and the wallet ends at exactly 0 wei. Live at zerodust.xyz, with an API at https://api.zerodust.xyz and developer docs at zerodust.xyz/docs.

This repository holds the contracts, the TypeScript SDK and the agent packages.

How it works

• Sponsored chains (EIP-7702): the wallet signs a SweepIntent and two EIP-7702 authorizations (one delegating to the ZeroDust contract, one removing it afterwards). A ZeroDust sponsor executes the sweep and pays the gas, reimbursed from the swept balance. The contract runs as the wallet and reverts unless the balance ends at exactly 0.
• MetaMask without a key: MetaMask's Advanced Permissions (ERC-7715) grant ZeroDustPermissionRouter a one-time allowance per chain; one EIP-712 signature covers every chain. The router redeems it, requires exactly 0, and settles like the contract. 16 chains.
• Direct chains (no EIP-7702): the wallet sends its own legacy transactions, sized to the wei by the API's planner (22 chains). On OP-stack chains with an L1 data fee it goes through ZeroDustGuard; on ZK-stack chains a ZeroDust paymaster pays the gas.
• What arrives: the destination's native gas, carried by Relay, Across (ETH to ETH), Stargate or Gas.zip, whichever delivers the most. A few chains whose coin no gas bridge carries deliver it as a token instead (Mitosis, Endurance, Intuition, Telos, 0G), said plainly in the quote. On request a sweep can also go into the chain's own bridge to Ethereum (to BNB Chain for opBNB), which the recipient proves and claims there later; Fraxtal's FRAX arrives on Ethereum as the FXS token.

For AI agents (paused)

The agent packages (@zerodust/mcp-server, @zerodust/ai-sdk, @zerodust/langchain) are paused and deprecated on npm, and the hosted MCP endpoint and agent key signup are switched off. The local MCP server and the SDK still sweep through the public API with your own key; keys issued before keep their rate limits. To sweep, use zerodust.xyz.

Package	Use
@zerodust/sdk	TypeScript client and agent (createAgentFromPrivateKey); the website uses it
@zerodust/mcp-server	MCP server, run locally (paused)
@zerodust/langchain	LangChain tools (paused)
@zerodust/ai-sdk	Vercel AI SDK tools (paused)

Contracts

Contract	Address (same on every chain, CREATE2)	Where
ZeroDustSweep (contracts/src/ZeroDustSweepMainnet.sol)	0x3732398281d0606aCB7EC1D490dFB0591BE4c4f2	the 55 sponsored chains below
ZeroDustPermissionRouter v2 (contracts/src/ZeroDustPermissionRouter.sol)	0x369A97dd256F7eb37fF7116C4EcBd50318eBb286	16 chains with MetaMask Advanced Permissions
ZeroDustGuard (contracts/src/ZeroDustGuard.yul)	0x2f95e6ED90a7dD67fc3Fae5c5628647E6A83e48e	Blast, Boba
ZeroDustPaymaster (contracts-zk/)	0x986e4Bb55AEEE6a8c80c28Ca787b13E216fD25B8	zkSync Era, Abstract, Lens

All are immutable: no admin functions, no upgrades, no pause (the paymaster's owner can only change its approver and withdraw its float). The sweep contract's sponsor address is fixed in its bytecode.

Supported chains

55 sponsored chains, generated from the live API (GET https://api.zerodust.xyz/chains):

Chain	ID	Token	Chain	ID	Token
Ethereum	1	ETH	Arc	5042	USDC
Optimism	10	ETH	Kaia	8217	KAIA
BNB Chain	56	BNB	Base	8453	ETH
Gnosis	100	xDAI	Plasma	9745	XPL
Unichain	130	ETH	0G	16661	0G
Polygon	137	POL	Apechain	33139	APE
Sonic	146	S	Mode	34443	ETH
Manta Pacific	169	ETH	Mythos	42018	ETH
X Layer	196	OKB	Arbitrum	42161	ETH
Fraxtal	252	FRAX	Arbitrum Nova	42170	ETH
Shape	360	ETH	Celo	42220	CELO
World Chain	480	ETH	Hemi	43111	ETH
Endurance	648	ACE	Zircuit	48900	ETH
Stable	988	gUSDT	Ink	57073	ETH
Intuition	1155	TRUST	Linea	59144

Regenerate or check this table with node scripts/generate-chain-docs.mjs (--check runs in CI); do not hand-edit it. The 19 direct chains are listed by GET https://api.zerodust.xyz/direct/chains: Flare, Cronos, Rootstock, Telos, XDC, Fuse, Monad, opBNB, Lens, Boba, zkSync Era, Flow EVM, HyperEVM, Metis, Vana, Abstract, Immutable zkEVM, Etherlink and Avalanche. Destinations are any EVM chain a bridge delivers native gas to (GET /destinations?fromChainId=), over 100 from Base.

Fees

1% of the swept value, at least $0.05 and at most $0.50; balances under $1 pay 5%, with no minimum. On top: the sweep's gas (and the L1 data fee on rollups) and, cross-chain, the bridge's fee. The signed maxTotalFeeWei caps what can be taken, so a gas spike cannot exceed what you agreed to.

Security

• No custody: every sweep is one atomic transaction from the wallet itself.
• The signed intent caps the fee and names the destination; for a bridge route routeHash (keccak256(callData)) binds the signature to that exact call.
• Every sponsored transaction is simulated before it is sent.
• ERC-7201 namespaced storage, so the contract's nonce never collides with another EIP-7702 app.
• Internal security review, 7 rounds, 16 issues found and fixed; contract tests drive a real EIP-7702 delegation and are mutation-verified. Not externally audited, and no audit is currently funded. Details: contracts/SECURITY.md, contracts/SECURITY_REPORT.md.

Layout

contracts/      Foundry: ZeroDustSweepMainnet.sol, ZeroDustPermissionRouter.sol, ZeroDustGuard.yul,
                tests, deploy scripts and broadcasts (README, SPECIFICATION, DEPLOYMENT, SECURITY)
contracts-zk/   ZeroDustPaymaster for ZK-stack chains (Hardhat + zksolc)
sdk/            @zerodust/sdk
packages/       @zerodust/mcp-server, @zerodust/ai-sdk, @zerodust/langchain
skills/         an agent skill for ZeroDust
scripts/        generate-chain-docs.mjs

License

MIT, see LICENSE.