BrowserProvider - ZKsync Docs

The BrowserProvider class is designed for integrating ZKsync with Web3 browser wallets such as Metamask and WalletConnect. It provides an easy way to interact with ZKsync Era using standard browser wallets.

`constructor`

Returns a provider object by extending the constructor of the Provider class and accepting an Eip1193Provider instead of a node URL.

Inputs

Parameter	Type	Description
`ethereum`	`Eip1193Provider`	The `Eip1193Provider` class instance. For instance, Metamask is `window.ethereum`.
`network?`	`Networkish`	Network name.

constructor(ethereum: Eip1193Provider, network?: Networkish)

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);

`estimateFee`

Returns an estimated fee for a requested transaction.

Inputs

Parameter	Type	Description
`transaction`	`TransactionRequest`	Transaction request.

async estimateFee(transaction: TransactionRequest): Promise<Fee>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const fee = await provider.estimateFee

({
  from: "0x36615Cf349d7F6344891B1e7CA7C72883F5dc049",
  to: "0xa61464658AfeAf65CccaaFD3a512b69A83B77618",
  value: `0x${BigInt(7_000_000_000).toString(16)}`,
});
console.log(`Fee: ${utils.toJSON(fee)}`);

`estimateGasL1`

Returns an estimate of the amount of gas required to submit a transaction from L1 to L2.

Inputs

Parameter	Type	Description
`transaction`	`TransactionRequest`	Transaction request.

async estimateGasL1(transaction: TransactionRequest): Promise<bigint>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const gasL1 = await provider.estimateGasL1({
  from: "0x36615Cf349d7F6344891B1e7CA7C72883F5dc049",
  to: await provider.getMainContractAddress(),
  value: 7_000_000_000,
  customData: {
    gasPerPubdata: 800,
  },
});
console.log(`L1 gas: ${BigInt(gasL1)}`);

`getAllAccountBalances`

Returns all balances for confirmed tokens given by an account address.

Inputs

Parameter	Type	Description
`address`	`Address`	Account address.

async getAllAccountBalances(address: Address): Promise<BalancesMap>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const balances = await provider.getAllAccountBalances("0x36615Cf349d7F6344891B1e7CA7C72883F5dc049");
console.log(`All balances: ${utils.toJSON(balances)}`);

`getBalance`

Returns the account balance for the specified account address, block tag, and token address.

Inputs

Parameter	Type	Description
`address`	`Address`	Account address.
`blockTag?`	`BlockTag`	Block tag for getting the balance on. Latest `committed` block is default.
`tokenAddress?`	`Address`	Token address. ETH is default.

async getBalance(address: Address, blockTag?: BlockTag, tokenAddress?: Address): Promise<bigint>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const account = "0x36615Cf349d7F6344891B1e7CA7C72883F5dc049";
const tokenAddress = "0x927488F48ffbc32112F1fF721759649A89721F8F"; // Crown token which can be minted for free
console.log(`ETH balance: ${await provider.getBalance(account)}`);
console.log(`Token balance: ${await provider.getBalance(account, "latest", tokenAddress)}`);

`getBaseTokenContractAddress`

Returns the L1 base token address.

async getBaseTokenContractAddress(): Promise<Address>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Base token: ${await provider.getBaseTokenContractAddress()}`);

`getBlock`

Returns the block for the given block hash or block tag.

Inputs

Parameter	Type	Description
`blockHashOrBlockTag`	`BlockTag`	Block tag for getting the balance on.
`includeTxs?`	`boolean`	Whether to fetch transactions that are in block.

async getBlock(blockHashOrBlockTag: BlockTag, includeTxs?: boolean): Promise<Block>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Block: ${utils.toJSON(await provider.getBlock("latest", true))}`);

`getBlockDetails`

Returns additional ZKsync-specific information about the L2 block.

Inputs

Parameter	Type	Description
`number`	`number`	Block number.

async getBlockDetails(number: number): Promise<BlockDetails>

Example

import { BrowserProvider, utils } from "zksync

-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Block details: ${utils.toJSON(await provider.getBlockDetails(90_000))}`);

`getBridgehubContractAddress`

Returns the Bridgehub smart contract address.

async getBridgehubContractAddress(): Promise<Address>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Bridgehub: ${await provider.getBridgehubContractAddress()}`);

`getBytecodeByHash`

Returns bytecode of a contract given by its hash.

Inputs

Parameter	Type	Description
`bytecodeHash`	`BytesLike`	Bytecode hash.

async getBytecodeByHash(bytecodeHash: BytesLike): Promise<Uint8Array>

Example

import { BrowserProvider, utils } from "zksync-ethers";

// Bytecode hash can be computed by following these steps:
// const testnetPaymasterBytecode = await provider.getCode(await provider.getTestnetPaymasterAddress());
// const testnetPaymasterBytecodeHash = ethers.hexlify(utils.hashBytecode(testnetPaymasterBytecode));

const testnetPaymasterBytecodeHash = "0x010000f16d2b10ddeb1c32f2c9d222eb1aea0f638ec94a81d4e916c627720e30";

const provider = new BrowserProvider(window.ethereum);
console.log(`Bytecode: ${await provider.getBytecodeByHash(testnetPaymasterBytecodeHash)}`);

`getConfirmedTokens`

Returns confirmed tokens bridged to ZKsync Era via the official bridge.

Inputs

Parameter	Type	Description
`start`	`Address`	The token id from which to start. Default 0.
`limit`	`Address`	The maximum number of tokens to list. Default 255.

async getConfirmedTokens(start = 0, limit = 255): Promise<Token[]>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const tokens = await provider.getConfirmedTokens();
console.log(`Confirmed tokens: ${utils.toJSON(tokens)}`);

`getDefaultBridgeAddresses`

Returns the addresses of the default ZKsync Era bridge contracts on both L1 and L2.

async getDefaultBridgeAddresses(): Promise<{
  erc20L1: string;
  erc20L2: string;
  wethL1: string;
  wethL2: string;
  sharedL1: string;
  sharedL2: string;
}>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const bridgeAddresses = await provider.getDefaultBridgeAddresses();
console.log(`Default bridges: ${utils.toJSON(bridgeAddresses)}`);

`getFeeParams`

Returns the current fee parameters.

async getFeeParams(): Promise<FeeParams>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const feeParams = await provider.getFeeParams();
console.log(`Fee: ${utils.toJSON(feeParams)}`);

`getGasPrice`

Returns an estimate of the gas price to use in a transaction.

async getGasPrice(): Promise<bigint>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Gas price: ${await provider.getGasPrice()}`);

`getL1BatchBlockRange`

Returns the range of blocks contained within a batch given by batch number.

Inputs

Parameter	Type	Description
`l1BatchNumber`	`number`	L1 batch number.

async getL1BatchBlockRange(l1BatchNumber: number): Promise<[number, number] | null>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const l1BatchNumber = await provider.getL1BatchNumber();
console.log(`L1 batch block range: ${utils.toJSON(await provider.getL1BatchBlockRange(l1BatchNumber))}`);

`getL1BatchDetails`

Returns data pertaining to a given batch.

Inputs

Parameter	Type	Description
`number`	`number`	L1 batch number.

async getL1BatchDetails(number: number): Promise<BatchDetails>

Example

`getL1BatchDetails`

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const l1BatchNumber = await provider.getL1BatchNumber();
console.log(`L1 batch details: ${utils.toJSON(await provider.getL1BatchDetails(l1BatchNumber))}`);

`getL1BatchNumber`

Returns the latest L1 batch number.

async getL1BatchNumber(): Promise<number>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`L1 batch number: ${await provider.getL1BatchNumber()}`);

`getLogProof`

Returns the proof for a transaction's L2 to L1 log.

Inputs

Parameter	Type	Description
`txHash`	`BytesLike`	Hash of the L2 transaction the L2 to L1 log was produced within.
`index?`	`number`	The index of the L2 to L1 log in the transaction.

async getLogProof(txHash: BytesLike, index?: number): Promise<LogProof | null>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const tx = "0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e";
console.log(`Log ${utils.toJSON(await provider.getLogProof(tx, 0))}`);

`getLogs`

Returns the logs that match the given filter.

Inputs

Parameter	Type	Description
`filter`	`Filter` or `FilterByBlockHash`	Filter query.

async getLogs(filter: Filter | FilterByBlockHash): Promise<Log[]>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Logs: ${utils.toJSON(await provider.getLogs({ fromBlock: 0, toBlock: 5, address: utils.L2_ETH_TOKEN_ADDRESS }))}`);

`getMainContractAddress`

Returns the main ZKsync Era smart contract address.

async getMainContractAddress(): Promise<Address>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Main contract: ${await provider.getMainContractAddress()}`);

`getProof`

Returns Merkle proofs for one or more storage values at the specified account.

Inputs

Parameter	Type	Description
`address`	`Address`	The account to fetch storage values and proofs for.
`keys`	`string[]`	Vector of storage keys in the account.
`l1BatchNumber`	`number`	Number of the L1 batch specifying the point in time at which the requested values are returned.

async getProof(address: Address, keys: string[], l1BatchNumber: number): Promise<StorageProof>

Example

import { BrowserProvider, utils } from "zksync-ethers";
import { ethers } from "ethers";

const provider = new BrowserProvider(window.ethereum);
const address = "0x082b1BB53fE43810f646dDd71AA2AB201b4C6b04";

// Fetching the storage proof for rawNonces storage slot in NonceHolder system contract.
// mapping(uint256 => uint256) internal rawNonces;

// Ensure the address is a 256-bit number by padding it
// because rawNonces slot uses uint256 for mapping addresses and their nonces.
const addressPadded = ethers.zeroPadValue(address, 32);

// Convert the slot number to a hex string and pad it to 32 bytes.
const slotPadded = ethers.zeroPadValue(ethers.toBeHex(0), 32);

// Concatenate the padded address and slot number.
const concatenated = addressPadded + slotPadded.slice(2); // slice to remove '0x' from the slotPadded

// Hash the concatenated string using Keccak-256.
const storageKey = ethers.keccak256(concatenated);

const l1BatchNumber = await provider.getL1BatchNumber();
const proof = await provider.getProof(address, [storageKey], l1BatchNumber);
console.log(`Proof: ${utils.toJSON(proof)}`);

`getProtocolVersion`

Returns the protocol version.

Inputs

Parameter	Type	Description
`id?`	`number`	Specific version ID (optional).

async getProtocolVersion(id?: number): Promise<ProtocolVersion>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Protocol version: ${await provider.getProtocolVersion()}`);

`getRawBlockTransactions`

Returns data of transactions in a block.

Inputs

Parameter	Type	Description
`number`	`number`	Block number.

async getRawBlockTransactions(number: number): Promise<RawBlockTransaction[]>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Raw block transactions: ${utils.toJSON(await provider.getRawBlockTransactions(90_000))}`);

`getSigner`

Returns a signer object for the provider.

Inputs

Parameter	Type	Description
`address?`	`Address`	Account address.

async getSigner(address?: Address): Promise<Signer>

Example

import { BrowserProvider, Wallet } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const signer = await provider.getSigner();

// Verify that signer matches the expected wallet address.
console.log(`Signer address: ${await signer.getAddress()}`);

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`L2 token address: ${await provider.l2TokenAddress("0x5C221E77624690fff6dd741493D735a17716c26B")}`);

`getTestnetPaymasterAddress`

Returns the testnet paymaster address if available, or null.

async getTestnetPaymasterAddress(): Promise<Address | null>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Testnet paymaster: ${await provider.getTestnetPaymasterAddress()}`);

`getTransaction`

Returns the transaction for the given transaction hash.

Inputs

Parameter	Type	Description
`txHash`	`string`	Transaction hash.

async getTransaction(txHash: string): Promise<TransactionResponse>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);

const TX_HASH = "<YOUR_TX_HASH_ADDRESS>";
const tx = await provider.getTransaction(TX_HASH);

// Wait until the transaction is processed by the server.
await tx.wait();
// Wait until the transaction is finalized.
await tx.waitFinalize();

`getTransactionDetails`

Returns data from a specific transaction given by the transaction hash.

Inputs

Parameter	Type	Description
`txHash`	`BytesLike`	Transaction hash.

async getTransactionDetails(txHash: BytesLike): Promise<TransactionDetails>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);

const TX_HASH = "<YOUR_TX_HASH_ADDRESS>";
console.log(`Transaction details: ${utils.toJSON(await provider.getTransactionDetails(TX_HASH))}`);

`getTransactionReceipt`

Returns the transaction receipt for the given transaction hash.

Inputs

Parameter	Type	Description
`txHash`	`string`	Transaction hash.

async getTransactionReceipt(txHash: string): Promise<TransactionReceipt | null>

Example

import { BrowserProvider, utils } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const TX_HASH = "<YOUR_TX_HASH_ADDRESS>";
console.log(`Transaction receipt: ${utils.toJSON(await provider.getTransactionReceipt(TX_HASH))}`);

`isBaseToken`

Returns whether the token is the base token.

Inputs

Parameter	Type	Description
`token`	`Address`	The address of the token.

async isBaseToken(token: Address): Promise<boolean>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Is base token: ${await provider.isBaseToken("0x5C221E77624690fff6dd741493D735a17716c26B")}`);

`isEthBasedChain`

Returns whether the chain is ETH-based.

async isEthBasedChain(): Promise<boolean>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`Is ETH based chain: ${await provider.isEthBasedChain()}`);

`l1ChainId`

Returns the L1 chain ID.

async l1ChainId(): Promise<number>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
const l1ChainId = await provider.l1ChainId();
console.log(`All balances: ${l1ChainId}`);

`l1TokenAddress`

Returns the L1 token address equivalent for a given L2 token address.

Inputs

Parameter	Type	Description
`token`	`Address`	The address of the token on L2.

async l1TokenAddress(token: Address): Promise<string>

Example

import { BrowserProvider } from "zksync-ethers";

const provider = new BrowserProvider(window.ethereum);
console.log(`L1 token address: ${await provider.l1TokenAddress("0x3e7676937A7E96CFB7616f255b9AD9FF47363D4b")}`);

`l2TokenAddress`

Returns the L2 token address equivalent for a given L1 token address.

Inputs

Parameter	Type	Description
`token`	`Address`	The address of the token on L1.

async l2TokenAddress(token: Address): Promise<string>

Provider

Provider object for interacting with ZKsync.

Introduction

Manage accounts and sign transactions in zksync-ethers.