Monad Chain ID (143) & RPC URL: Add Monad to MetaMask

Q: "What is the Monad chain ID?"

"The Monad chain ID is 143, or 0x8f in hexadecimal. Wallets use it to make sure a transaction is signed for Monad and not another network."

Q: "What is the Monad RPC URL?"

"A working public RPC URL is https://rpc.monad.xyz. We tested it on October 27, 2026: it returned chain ID 143. Other working endpoints are listed in the table on this page."

Q: "How do I add Monad to MetaMask?"

"Click \"Add Monad to MetaMask\" on this page and approve the request in MetaMask. To add it manually, go to Networks, then Add a custom network, and enter the network name, RPC URL https://rpc.monad.xyz, chain ID 143, currency symbol MON and the explorer URL."

Q: "What token do I need for gas on Monad?"

"Gas on Monad is paid in MON. Keep a small amount in your wallet, otherwise you cannot send or swap the tokens you hold there."

Q: "What is the Monad testnet chain ID?"

"The Monad Testnet testnet uses chain ID 10143 (0x279f) and the RPC URL https://testnet-rpc.monad.xyz. Testnet tokens have no value."

Network settings for Monad: chain ID 143, a working RPC URL and the explorer. Add it to MetaMask in one click, or copy the fields below.

Chain ID143
Hex0x8f
Gas tokenMON
RPC checkedOctober 27

By Step Exchange Research · Updated October 27, 2026

The Monad chain ID is 143 (0x8f in hex). Monad is a high-throughput Layer 1 that runs EVM smart contracts. Gas is paid in MON. 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.

Monad Network Details for MetaMask

Field	Value
Network name	Monad
RPC URL	`https://rpc.monad.xyz`
Chain ID	143
Currency symbol	MON
Block explorer	https://monadvision.com

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.

Monad RPC URLs (Tested October 27, 2026)

RPC endpoint	Returned chain ID	Response time
`https://rpc.monad.xyz`	143	299 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 143. The latest block was 117,068,580. Public endpoints are free and rate limited: for an app or a bot, use a paid provider or your own node.

How to Add Monad to MetaMask

Click Add Monad to MetaMask above, or open MetaMask and go to Networks → Add a custom network.
Enter the network name Monad, RPC URL https://rpc.monad.xyz and chain ID 143.
Set the currency symbol to MON and the block explorer to https://monadvision.com.
Save and switch to the new network. Your 0x address is the same as on other EVM networks.

Tip: The Monad testnet (chain ID 10143) and mainnet (143) are different networks. Testnet MON from faucets has no value.

Monad Testnet Testnet

Field	Value
Network name	Monad Testnet
RPC URL	`https://testnet-rpc.monad.xyz`
Chain ID	10143 (0x279f)
Currency symbol	MON
Block explorer	https://testnet.monadexplorer.com

Testnet tokens come from faucets and are worth nothing. Do not send real MON to a wallet connected to Monad Testnet.

How to Get MON on Monad

The widget at the top of this page is set to swap into MON on Monad: pick the token you have on another network, enter your address and sign once. Routes, fees and timing are covered in our Monad bridge guide.

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

FAQ

What is the Monad chain ID?

The Monad chain ID is 143, or 0x8f in hexadecimal. Wallets use it to make sure a transaction is signed for Monad and not another network.

What is the Monad RPC URL?

A working public RPC URL is https://rpc.monad.xyz. We tested it on October 27, 2026: it returned chain ID 143. Other working endpoints are listed in the table on this page.

How do I add Monad to MetaMask?

Click "Add Monad to MetaMask" on this page and approve the request in MetaMask. To add it manually, go to Networks, then Add a custom network, and enter the network name, RPC URL https://rpc.monad.xyz, chain ID 143, currency symbol MON and the explorer URL.

What token do I need for gas on Monad?

Gas on Monad is paid in MON. Keep a small amount in your wallet, otherwise you cannot send or swap the tokens you hold there.

What is the Monad testnet chain ID?

The Monad Testnet testnet uses chain ID 10143 (0x279f) and the RPC URL https://testnet-rpc.monad.xyz. Testnet tokens have no value.