zkSync Native Bridge (zksync-bridge)

Official zkSync Era bridge via DiamondProxy. Deposits ETH and executes L2 transactions from Ethereum with ZK proof-based finality.

Fact	Value
Category	Bridges
Family	none
Namespace	`ZksyncBridge` on ethereum, zksync
Chains	ethereum, zksync

Notes

L1 to L2 via DiamondProxy. For L2 to L1 withdrawals, use the L2 withdraw mechanism on zkSync Era
requestL2Transaction is a general-purpose L1-to-L2 transaction request — handles ETH deposits, contract calls, and even contract deployments (via _factoryDeps)
msg.value must cover: _l2Value + l2TransactionBaseCost(gasPrice, _l2GasLimit, _l2GasPerPubdataByteLimit)
Use l2TransactionBaseCost() to estimate the gas cost component before submitting
_l2GasPerPubdataByteLimit: 800 is the standard value (required for pubdata pricing)
_factoryDeps: used when deploying contracts via L1. Empty array for standard ETH transfers
zkEVM architecture — L2 to L1 withdrawals finalize with ZK proofs (typically 1-24 hours)
L1 to L2 deposits finalize after the batch containing the transaction is committed (~minutes)
For ERC-20 bridging, use the zkSync ERC20 Bridge contracts (separate from the DiamondProxy)
Canonical bridge, secured by zkSync’s ZK proving system (Matter Labs)

On Ethereum, ZksyncBridge is a namespace: its contracts need no import.

function main() {
  // Ethereum's diamondProxy, `0x32400084C286CF3E17e7B677ea9583e60a000324`.
  require(ZksyncBridge.DiamondProxy != 0);
}

Chain	Contract	Address	In a program
Ethereum	diamondProxy	`0x32400084C286CF3E17e7B677ea9583e60a000324`	`ZksyncBridge.DiamondProxy`
zkSync Era	l2Bridge	`0x11f943b2c77b743AB90f4A0Ae7d5A4e7FCA3E102`	`ZksyncBridge.L2Bridge`

import ZkSyncDiamondProxyABI from "./protocols/zksync-bridge/ZkSyncDiamondProxyABI.json"; Speaks for: diamondProxy.

requestL2Transaction(address _contractL2, uint256 _l2Value, bytes _calldata, uint256 _l2GasLimit, uint256 _l2GasPerPubdataByteLimit, bytes[] _factoryDeps, address _refundRecipient) payable returns (bytes32 canonicalTxHash)
l2TransactionBaseCost(uint256 _gasPrice, uint256 _l2GasLimit, uint256 _l2GasPerPubdataByteLimit) view returns (uint256)