Provider - ZKsync Docs

A Web3 Provider object provides application-layer access to underlying blockchain networks.

The zksync2-java library supports provider methods from the web3j library and supplies additional functionality.

ZkSync: Supplies the same functionality as Web3 and extends it with ZKsync-specific methods.

`ZkSync`

This doc details ZKsync Era specific methods.
Web3Swift implementations link to their docs.

`allAccountBalances`

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

Calls the zks_getAllAccountBalances JSON-RPC method.

Inputs

Parameter	Type	Description
`address`	`String`	Account address.

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
      ZksAccountBalances allBalances = zkSync.zksGetAllAccountBalances("0x36615Cf349d7F6344891B1e7CA7C72883F5dc049").send();
    }
}

`constructor`

Returns a ZkSyncClient object.

Inputs

Parameter	Type	Description
`providerURL`	`URL`	Network RPC URL (optional).

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;

public class Main {
    public static void main(String ...args) {
        ZkSync zksync = ZkSync.build(new HttpService("https://sepolia.era.zksync.dev"));
    }
}

`estimateFee`

Returns an estimated ZksEstimateFee for requested transaction.

Inputs

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

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
      io.zksync.methods.request.Transaction estimate = io.zksync.methods.request.Transaction.createFunctionCallTransaction(
                "0x7e5f4552091a69125d5dfcb7b8c2659029395bdf",
                "0x7e5f4552091a69125d5dfcb7b8c2659029395bdf",
                BigInteger.ZERO,
                BigInteger.ZERO,
                "0x"
        );

      Fee fee = zksync.zksEstimateFee(estimate).send().getResult();
    }

`estimateGas`

Returns an estimate of the amount of gas required to submit a transaction to the network.

Inputs

Parameter	Type	Description
`transaction`	`Transaction`	Transaction class.

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
      io.zksync.methods.request.Transaction estimate = io.zksync.methods.request.Transaction.createFunctionCallTransaction(
                "0x7e5f4552091a69125d5dfcb7b8c2659029395bdf",
                "0x7e5f4552091a69125d5dfcb7b8c2659029395bdf",
                BigInteger.ZERO,
                BigInteger.ZERO,
                "0x"
        );

      BigInteger gasUsed = zksync.ethEstimateGas(estimate).send().getAmountUsed();
    }
}

`estimateGasL1`

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

Calls the zks_estimateL1ToL2 JSON-RPC method.

Inputs

Parameter	Type	Description
`transaction`	`Transaction`	Transaction class.

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
      io.zksync.methods.request.Transaction estimate = io.zksync.methods.request.Transaction.createFunctionCallTransaction(
                "0x7e5f4552091a69125d5dfcb7b8c2659029395bdf",
                "0x7e5f4552091a69125d5dfcb7b8c2659029395bdf",
                BigInteger.ZERO,
                BigInteger.ZERO,
                "0x"
        );

      BigInteger estimatedGas = zksync.estimateGasL1(estimate).send().getAmountUsed();
    }
}

`estimateL1ToL2Execute`

Returns gas estimation for an L1 to L2 execute operation.

Inputs

Parameter	Type	Description
`contractAddress`	`String`	Address of contract.
`calldata`	`byte[]`	The transaction call data.
`caller`	`String`	Caller address.
`l2GasLimit`	`BigInteger`	Current L2 gas value (optional).
`l2Value`	`BigInteger`	L2 amount (optional).
`factoryDeps`	`byte[][]`	Factory deps (optional).
`operatorTip`	`BigInteger`	Operator tip (optional).
`gasPerPubdataByte?`	`BigInteger`	Constant representing current amount of gas per byte (optional).
`refoundRecipient`	`String`	Refound address.

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
      String mainContractAddress = zksync.zksMainContract().sendAsync().join()

      BigInteger estimatedGas = zksync.estimateGasL1(mainContractAddress, Numeric.hexStringToByteArray("0x"), "0x36615Cf349d7F6344891B1e7CA7C72883F5dc049", null, BigInteger.
      valueOf(7_000_000_000L), null, null, null, null).
      send().
      getAmountUsed();
    }
}

`getBlockDetails`

Returns additional ZKsync-specific information about the L2 block.

Calls the zks_getBlockDetails JSON-RPC method.

Inputs

Parameter	Type	Description
`blockNumber`	`BigInteger`	Block number.

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
      ZksBlockDetails blockDetails = zkSync.getBlockDetails(BigInteger.valueOf(90_000)).send();
    }
}

`getL1BatchBlockRange`

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

Calls the zks_getL1BatchBlockRange JSON-RPC method.

Inputs

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

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        BigInteger l1BatchNumber = zkSync.getL1BatchNumber().send().getL1BatchNumber();
        BlockRange blockRange = zkSync.getL1BatchBlockRange(l1BatchNumber).send().getResult();
    }
}

`getL1BatchDetails`

Returns data pertaining to a given batch.

Calls the zks_getL1BatchDetails JSON-RPC method.

Inputs

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

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        BigInteger l1BatchNumber = zkSync.getL1BatchNumber().send().getL1BatchNumber();
        BatchDetails blockRange = zkSync.getL1BatchBlockRange(l1BatchNumber).send().getResult();
    }
}

`getL1BatchNumber`

Returns the latest L1 batch number.

Calls the zks_getL1BatchNumber JSON-RPC method.

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        BigInteger l1BatchNumber = zkSync.getL1BatchNumber().send().getL1BatchNumber();
    }
}

`getL2ToL1LogProof`

Returns the proof for a transaction's L2 to L1 log sent via the L1Messenger system contract.

Calls the zks_getL2ToL1LogProof JSON-RPC method.

Inputs

Parameter	Type	Description
`txHash`	`String`	Hash of the L2 transaction the L2 to L1 log was produced within.
`index`	`int`	The index of the L2 to L1 log in the transaction (optional).

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        // Any L2 -> L1 transaction can be used.
        // In this case, withdrawal transaction is used.
        String tx = "0x2a1c6c74b184965c0cb015aae9ea134fd96215d2e4f4979cfec12563295f610e";
        L2ToL1MessageProof result = zkSync.zksGetL2ToL1LogProof(tx, 0).sendAsync().join().getResult();
    }
}

`getTransferTransaction`

Returns the populated transfer transaction.

Inputs

Parameter	Type	Description
`tx`	`TransferTransaction`	TransferTransaction class.
`transactionManager`	`TransactionManager`	L2 transaction manager.
`gasProvider`	`ContractGasProvider`	L2 gas provider.

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        TransferTransaction transaction = new TransferTransaction(RECEIVER, amount, signer.getAddress());
        Transaction result = zkSync.getTransferTransaction(transaction, transactionManager, gasProvider).sendAsync().join().getResult();
    }
}

Retrieve populated ETH transfer transaction using paymaster to facilitate fee payment with an ERC20 token.

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        BigInteger amount = BigInteger.valueOf(7_000_000_000L);
        PaymasterParams paymasterParams = new PaymasterParams(PAYMASTER, Numeric.hexStringToByteArray(FunctionEncoder.encode(Paymaster.encodeApprovalBased(TOKEN, BigInteger.ONE, new byte[] {}))));

        TransferTransaction transaction = new TransferTransaction(RECEIVER, amount, signer.getAddress(), paymasterParams);
        Transaction result = zkSync.getTransferTransaction(transaction, transactionManager, gasProvider).sendAsync().join().getResult();
    }
}

`getWithdrawTx`

Returns the populated withdrawal transaction.

Inputs

Parameter	Type	Description
`tx`	`TransferTransaction`	TransferTransaction class.
`transactionManager`	`TransactionManager`	L2 transaction manager.
`gasProvider`	`ContractGasProvider`	L2 gas provider.

Examples

Retrieve populated ETH withdrawal transactions.

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        WithdrawTransaction transaction = new WithdrawTransaction(RECEIVER, amount, signer.getAddress());
        Transaction result = zkSync.getWithdrawTx(transaction, transactionManager, gasProvider).sendAsync().join().getResult();
    }
}

Retrieve populated ETH withdrawal transaction using paymaster to facilitate fee payment with an ERC20 token.

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        BigInteger amount = BigInteger.valueOf(7_000_000_000L);
        PaymasterParams paymasterParams = new PaymasterParams(PAYMASTER, Numeric.hexStringToByteArray(FunctionEncoder.encode(Paymaster.encodeApprovalBased(TOKEN, BigInteger.ONE, new byte[] {}))));

        WithdrawTransaction transaction = new WithdrawTransaction(RECEIVER, amount, signer.getAddress(), paymasterParams);
        Transaction result = zkSync.getWithdrawTx(transaction, transactionManager, gasProvider).sendAsync().join().getResult();
    }
}

`l1ChainId`

Returns the chain id of the underlying L1.

Calls the zks_L1ChainId JSON-RPC method.

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        BigInteger result = zkSync.l1ChainId().sendAsync().join().getResult();
    }
}

`l1TokenAddress`

Returns the L1 token address equivalent for a L2 token address as they are not equal. ETH's address is set to zero address.

Only works for tokens bridged on default ZKsync Era bridges.

Inputs

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

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        BigInteger result = zkSync.l1ChainId().sendAsync().join().getResult();
    }
}

`mainContract`

Returns the main ZKsync Era smart contract address.

Calls the zks_getMainContract JSON-RPC method.

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        String result = zkSync.zksMainContract().sendAsync().join().getResult();
    }
}

`zksGetBridgeContracts`

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

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
      ZksBlockDetails blockDetails = zkSync.zksGetBridgeContracts().send();
    }
}

`zksGetTestnetPaymaster`

Returns the testnet paymaster address if available, or null.

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        String result = zkSync.zksGetTestnetPaymaster().sendAsync().join().getResult();
    }
}

`zksGetTransactionDetails`

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

Calls the getTransactionDetails JSON-RPC method.

Inputs

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

Example

import io.zksync.protocol.ZkSync;
import org.web3j.protocol.http.HttpService;
import io.zksync.methods.response.ZkTransactionReceipt;

public class Main {
    public static void main(String ...args) {
        TransactionDetails result = zkSync.zksGetTransactionDetails("<TX_HASH>").sendAsync().join().getResult();
    }
}

Introduction

Overview of Web3Providers and their functions.

Introduction

Manage accounts and sign transactions in the ZKsync2-java.