The Base chain ID is 8453 (0x2105 in hex). Base is an Ethereum Layer 2 built on the OP Stack and incubated by Coinbase. Gas is paid in ETH. Below are the exact settings MetaMask asks for, public RPC endpoints we tested on October 27, 2026, and a one-click button to add the network.
Base Network Details for MetaMask
| Field | Value |
|---|---|
| Network name | Base |
| RPC URL | https://mainnet.base.org/ |
| Chain ID | 8453 |
| Currency symbol | ETH |
| Block explorer | https://basescan.org |
Copy these values exactly. If the RPC URL returns a different chain ID than the one you enter, MetaMask stops with a chain ID mismatch warning: that usually means a typo or an RPC for another network.
Base RPC URLs (Tested October 27, 2026)
| RPC endpoint | Returned chain ID | Response time |
|---|---|---|
https://mainnet.base.org/ | 8453 | 329 ms |
https://base-rpc.publicnode.com | 8453 | 187 ms |
https://base.gateway.tenderly.co | 8453 | 252 ms |
https://rpc.baseazul.dev | 8453 | 621 ms |
We sent eth_chainId and eth_blockNumber to each endpoint from Europe on October 27, 2026; the table lists only endpoints that answered with chain ID 8453. The latest block was 53,161,469. Public endpoints are free and rate limited: for an app or a bot, use a paid provider or your own node.
How to Add Base to MetaMask
- Click Add Base to MetaMask above, or open MetaMask and go to Networks → Add a custom network.
- Enter the network name Base, RPC URL
https://mainnet.base.org/and chain ID 8453. - Set the currency symbol to ETH and the block explorer to https://basescan.org.
- Save and switch to the new network. Your 0x address is the same as on other EVM networks.
Tip: Base is available in the MetaMask network list and in the Base app from Coinbase, so check the list before adding it manually.
Base Sepolia Testnet
| Field | Value |
|---|---|
| Network name | Base Sepolia |
| RPC URL | https://sepolia.base.org |
| Chain ID | 84532 (0x14a34) |
| Currency symbol | ETH |
| Block explorer | https://sepolia.basescan.org |
Testnet tokens come from faucets and are worth nothing. Do not send real ETH to a wallet connected to Base Sepolia.
How to Get ETH on Base
The widget at the top of this page is set to swap into ETH on Base: pick the token you have on another network, enter your address and sign once. Routes, fees and timing are covered in our Base bridge guide.
Related
- What is a chain ID? - how chain IDs protect transactions
- How to add a network to MetaMask - the manual steps in detail
- Gas tokens by chain - what each network charges fees in
- All networks: chain ID list