Arbitrum Native Bridge (arbitrum-bridge)

Official Arbitrum L1-L2 gateway bridge. Routes tokens through the canonical Arbitrum rollup bridge with 7-day withdrawal finality.

Fact	Value
Category	Bridges
Family	none
Namespace	`ArbitrumBridge` on ethereum, arbitrum
Chains	ethereum, arbitrum

Notes

L1 to L2 only via this contract. For L2 to L1 withdrawals, use ArbSys.sendTxToL1() on Arbitrum (takes 7 days)
The router auto-routes tokens to the correct gateway (standard, custom, or WETH gateway)
Approval target: approve tokens to the gateway returned by getGateway(token), NOT to the router itself
msg.value must cover: maxSubmissionCost + (maxGas * gasPriceBid) for L2 execution
L1 to L2 deposits finalize in ~10-15 minutes (after L1 finality + sequencer inclusion)
L2 to L1 withdrawals require 7-day challenge period before funds can be claimed on L1
For ETH deposits, send ETH directly to the Arbitrum Delayed Inbox (no token approval needed)
Canonical bridge, secured by the Arbitrum rollup itself

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

function main() {
  // Ethereum's l1GatewayRouter, `0x72Ce9c846789fdB6fC1f34aC4AD25Dd9ef7031ef`.
  require(ArbitrumBridge.L1GatewayRouter != 0);
}

Chain	Contract	Address	In a program
Ethereum	l1GatewayRouter	`0x72Ce9c846789fdB6fC1f34aC4AD25Dd9ef7031ef`	`ArbitrumBridge.L1GatewayRouter`
Arbitrum One	l2GatewayRouter	`0x5288c571Fd7aD117beA99bF60FE0846C4E84F933`	`ArbitrumBridge.L2GatewayRouter`

import ArbitrumL1GatewayRouterABI from "./protocols/arbitrum-bridge/ArbitrumL1GatewayRouterABI.json"; Speaks for: l1GatewayRouter.

outboundTransfer(address _token, address _to, uint256 _amount, uint256 _maxGas, uint256 _gasPriceBid, bytes _data) payable returns (bytes)
getGateway(address _token) view returns (address)