System Contracts

These are standard OP Stack predeploy addresses used on many OP chains. Verify against your deployment and update if customized.

Contract	Address
GasPriceOracle	0x420000000000000000000000000000000000000F
L2CrossDomainMessenger	0x4200000000000000000000000000000000000007
L2StandardBridge	0x4200000000000000000000000000000000000010
L2ToL1MessagePasser	0x4200000000000000000000000000000000000016
L1Block (attributes)	0x4200000000000000000000000000000000000015
ProxyAdmin	0x4200000000000000000000000000000000000018
WETH (WETH9)	0x4200000000000000000000000000000000000006

L1-side system contracts (Portal, SystemConfig, L2OutputOracle, etc.) will be published after mainnet/testnet deployment finalization.