Base

Base is an Ethereum L2 built by Coinbase on the OP Stack, with EVM-compatible execution.

Chain IDs

Network	Chain ID
Base (mainnet)	8453
Base Sepolia (testnet)	84532

Technical summary

• Stack: OP Stack (optimistic rollup class), aligned with the broader Superchain ecosystem.
• VM: EVM compatible.
• Wallets: Safe wallet flows on Base are supported through IBEx; set X-Blockchain-Id to the chain you target.

API configuration

X-Blockchain-Id: 8453

Testnet:

X-Blockchain-Id: 84532

See also

• Supported blockchains
• Safe Smart Account