SmartAccount - ZKsync Docs

A SmartAccount is a signer which can be configured to sign various payloads using a provided secret. The secret can be in any form, allowing for flexibility when working with different account implementations. The SmartAccount is bound to a specific address and provides the ability to define custom method for populating transactions and custom signing method used for signing messages, typed data, and transactions. It is compatible with ethers.ContractFactory for deploying contracts/accounts, as well as with ethers.Contract for interacting with contracts/accounts using provided ABI along with custom transaction signing logic.

`connect`

Creates a new instance of SmartAccount connected to a provider or detached from any provider if null is provided.

Inputs

Parameter	Type	Description
`provider`	`Provider` or `null`	The provider to connect the `SmartAccount` to. If `null`, the `SmartAccount` will be detached from any provider.

connect(provider: null | Provider): SmartAccount

Example

import { Wallet, Provider, types } from "zksync-ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const sepoliaProvider = Provider.getDefaultProvider(types.Network.Sepolia);
const sepoliaAccount = new SmartAccount({ address: ADDRESS, secret: PRIVATE_KEY }, sepoliaProvider);

const mainnetProvider = Provider.getDefaultProvider(types.Network.Mainnet);
const mainnetAccount = sepoliaAccount.connect(mainnetProvider);

`constructor`

Creates a SmartAccount instance with provided signer and provider. By default, uses signPayloadWithECDSA and populateTransactionECDSA.

Inputs

Parameter	Type	Description
`signer`	`SmartAccountSigner`	Contains necessary properties for signing payloads.
`provider?`	`Provider` or `null`	The provider to connect to. Can be `null` for offline usage.

constructor(signer: SmartAccountSigner, provider?: null | Provider)

Example

import { SmartAccount, Provider, types } from "zksync-ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount({ address: ADDRESS, secret: PRIVATE_KEY }, provider);

`getAddress`

Returns the address of the account.

getAddress(): Promise<string>

Example

import { SmartAccount, Provider, types } from "zksync-ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount({ address: ADDRESS, secret: PRIVATE_KEY }, provider);

const address = await account.getAddress();

`getAllBalances`

Returns all token balances of the account.

async getAllBalances(): Promise<BalancesMap>

Example

import { SmartAccount, Provider, types } from "zksync-ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount({ address: ADDRESS, secret: PRIVATE_KEY }, provider);

const balances = await account.getAllBalances();

`getBalance`

Returns the balance of the account.

Inputs

Parameter	Type	Description
`token?`	`Address`	The token address to query balance for. Defaults to the native token.
`blockTag`	`BlockTag`	The block tag to get the balance at. Defaults to `committed`.

async getBalance(token?: Address, blockTag: BlockTag = 'committed'): Promise<bigint>

Example

import { SmartAccount, Provider, types } from "zksync-ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount({ address: ADDRESS, secret: PRIVATE_KEY }, provider);

const balance = await account.getBalance();

`getDeploymentNonce`

Returns the deployment nonce of the account.

async getDeploymentNonce(): Promise<bigint>

Example

import { SmartAccount, Provider, types } from "zksync-ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount({ address: ADDRESS, secret: PRIVATE_KEY }, provider);

const nonce = await account.getDeploymentNonce();

`populateTransaction`

Populates the transaction tx using the provided TransactionBuilder function. If tx.from is not set, it sets the value from the getAddress method which can be utilized in the TransactionBuilder function.

Inputs

Parameter	Type	Description
`tx`	`TransactionRequest`	The transaction that needs to be populated.

async populateTransaction(tx: TransactionRequest): Promise<TransactionLike>

Example

import { SmartAccount, Provider, types, utils } from "zksync-ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount({ address: ADDRESS, secret: PRIVATE_KEY }, provider);

const populatedTx = await account.populateTransaction({
  type: utils.EIP712_TX_TYPE,
  to: "<RECEIVER>",
  value: 7_000_000_000,
});

`sendTransaction`

Sends tx to the Network. The signTransaction is called first to ensure transaction is properly signed.

Inputs

Parameter	Type	Description
`tx`	`TransactionRequest`	The transaction that needs to be sent.

async sendTransaction(tx: TransactionRequest): Promise<TransactionResponse>

Example

import { SmartAccount, Provider, types } from "zksync-ethers";
import { ethers } from "ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount({ address: ADDRESS, secret: PRIVATE_KEY }, provider);

const signedTx = await account.sendTransaction({
  to: "<RECEIVER>",
  value: ethers.parseEther("1"),
});

`signMessage`

Signs a message using the provided PayloadSigner function.

Inputs

Parameter	Type	Description
`message`	`string` or `Uint8Array`	The message that needs to be signed.

signMessage(message: string | Uint8Array): Promise<string>

Example

import { SmartAccount, Provider, types } from "zksync-ethers";
import { ethers } from "ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount({ address: ADDRESS, secret: PRIVATE_KEY }, provider);

const signedMessage = await account.signMessage("Hello World!");

`signTransaction`

Signs the transaction tx using the provided PayloadSigner function, returning the fully signed transaction. The populateTransaction method is called first to ensure that all necessary properties for the transaction to be valid have been populated.

Inputs

Parameter	Type	Description
`tx`	`TransactionRequest`	The transaction that needs to be signed.

async signTransaction(tx: TransactionRequest): Promise<string>

Example

import { SmartAccount, Provider, types } from "zksync-ethers";
import { ethers } from "ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount({ address: ADDRESS, secret: PRIVATE_KEY }, provider);

const signedTx = await account.signTransaction({
  to: "<RECEIVER>",
  value: ethers.parseEther("1"),
});

`signTypedData`

Signs a typed data using the provided PayloadSigner function.

Inputs

Parameter	Type	Description
`domain`	`ethers.TypedDataDomain`	The domain data.
`types`	`Record<string, ethers.TypedDataField[]>`	A map of records pointing from field name to field type.
`value`	`Record<string, any>`	A single record value.

async signTypedData(
  domain: ethers.TypedDataDomain,
  types: Record<string, ethers.TypedDataField[]>,
  value: Record<string, any>
): Promise<string>

Example

import { SmartAccount, Provider, types } from "zksync-ethers";
import { ethers } from "ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount({ address: ADDRESS, secret: PRIVATE_KEY }, provider);

const signedTypedData = await account.signTypedData(
  { name: "Example", version: "1", chainId: 270 },
  {
    Person: [
      { name: "name", type: "string" },
      { name: "age", type: "uint8" },
    ],
  },
  { name: "John", age: 30 }
);

`transfer`

Transfer ETH or any ERC20 token within the same interface.

Inputs

Parameter	Type	Description
`transaction.to`	`Address`	The address of the recipient.
`transaction.amount`	`BigNumberish`	The amount of the token to transfer.
`transaction.token?`	`Address`	The address of the token. `ETH` by default.
`transaction.paymasterParams?`	`PaymasterParams`	Paymaster parameters.
`transaction.overrides?`	`ethers.Overrides`	Transaction's overrides which may be used to pass l2 `gasLimit`, `gasPrice`, `value`, etc.

async transfer(transaction: {
  to: Address;
  amount: BigNumberish;
  token ? : Address;
  paymasterParams?: PaymasterParams;
  overrides ? : ethers.Overrides;
}): Promise<ethers.ContractTransaction>

Examples

Transfer ETH.

import { SmartAccount, Wallet, Provider, types } from "zksync-ethers";
import { ethers } from "ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount(
  {address: ADDRESS, secret: PRIVATE_KEY},
  provider
);

const transferTx = await account.transfer({
  token: utils.ETH_ADDRESS,
  to: Wallet.createRandom().address,
  amount: ethers.parseEther("0.01"),
});

const receipt = await transferTx.wait();

console.log(`The sum of ${receipt.value} ETH was transferred to ${receipt.to}`);

Transfer ETH using paymaster to facilitate fee payment with an ERC20 token.

import { SmartAccount, Wallet, Provider, utils } from "zksync-ethers";
import { ethers } from "ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const token = "0x927488F48ffbc32112F1fF721759649A89721F8F"; // Crown token which can be minted for free
const paymaster = "0x13D0D8550769f59aa241a41897D4859c87f7Dd46"; // Paymaster for Crown token

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount(
  {address: ADDRESS, secret: PRIVATE_KEY},
  provider
);

const transferTx = await account.transfer({
  to: Wallet.createRandom().address,
  amount: ethers.parseEther("0.01"),
  paymasterParams: utils.getPaymasterParams(paymaster, {
    type: "ApprovalBased",
    token: token,
    minimalAllowance: 1,
    innerInput: new Uint8Array(),
  }),
});

const receipt = await transferTx.wait();

console.log(`The sum of ${receipt.value} ETH was transferred to ${receipt.to}`);

`withdraw`

Initiates the withdrawal process which withdraws ETH or any ERC20 token from the associated account on L2 network to the target account on L1 network.

Inputs

Parameter	Type	Description
`transaction.token`	`Address`	The address of the token. `ETH` by default.
`transaction.amount`	`BigNumberish`	The amount of the token to withdraw.
`transaction.to?`	`Address`	The address of the recipient on L1.
`transaction.bridgeAddress?`	`Address`	The address of the bridge contract to be used.
`transaction.paymasterParams?`	`PaymasterParams`	Paymaster parameters.
`transaction.overrides?`	`ethers.Overrides`	Transaction's overrides which may be used to pass l2 `gasLimit`, `gasPrice`, `value`, etc.

async withdraw(transaction: {
  token: Address;
  amount: BigNumberish;
  to?: Address;
  bridgeAddress?: Address;
  paymasterParams?: PaymasterParams;
  overrides?: ethers.Overrides;
}): Promise<TransactionResponse>

Examples

Withdraw ETH.

import { SmartAccount, Provider, types, utils } from "zksync-ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount(
  {address: ADDRESS, secret: PRIVATE_KEY},
  provider
);

const withdrawTx = await account.withdraw({
  token: utils.ETH_ADDRESS,
  amount: 10_000_000n,
});

Withdraw ETH using paymaster to facilitate fee payment with an ERC20 token.

import { SmartAccount, Provider, types, utils } from "zksync-ethers";

const ADDRESS = "<ADDRESS>";
const PRIVATE_KEY = "<PRIVATE_KEY>";

const token = "0x927488F48ffbc32112F1fF721759649A89721F8F"; // Crown token which can be minted for free
const paymaster = "0x13D0D8550769f59aa241a41897D4859c87f7Dd46"; // Paymaster for Crown token

const provider = Provider.getDefaultProvider(types.Network.Sepolia);
const account = new SmartAccount(
  {address: ADDRESS, secret: PRIVATE_KEY},
  provider
);

const withdrawTx = await account.withdraw({
  token: utils.ETH_ADDRESS,
  amount: 10_000_000n,
  paymasterParams: utils.getPaymasterParams(paymaster, {
    type: "ApprovalBased",
    token: token,
    minimalAllowance: 1,
    innerInput: new Uint8Array(),
  }),
});

EIP712Signer

How to integrate EIP712Signer with ZKsync and ethers.js

SmartAccount Factories

ECDSASmartAccount and MultisigECDSASmartAccount for SmartAccount.