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Carbonium Testnet Network

Add Carbonium Testnet Network to Your Wallet — MetaMask, OKX, Rabby, Trust Wallet

Testnet
Chain ID: 4040·Symbol: tCBR

Carbonium Testnet Network is an EVM-compatible blockchain with Chain ID 4040 and native token tCBR. This page lets you add Carbonium Testnet Network to MetaMask, Rabby Wallet, OKX Wallet or Trust Wallet in one click — no manual Chain ID or RPC entry required.

RPC Endpoints
https://rpc-dev.carbonium.network/
https://server-testnet.carbonium.network

Block Explorer

Carbonium Network tesnet Explorer

What is Carbonium Testnet Network?

Carbonium Testnet Network is an EVM (Ethereum Virtual Machine) compatible blockchain network. Any EVM wallet — MetaMask, Rabby, OKX Wallet, Trust Wallet, Coinbase Wallet — can connect and transact on Carbonium Testnet Network once you add the network configuration.

Why do you need to add Carbonium Testnet Network to your wallet?

MetaMask and most wallets only come pre-configured with Ethereum Mainnet. To transact, swap tokens, or use dApps on Carbonium Testnet Network, you need to add the network first. Entering an incorrect Chain ID or RPC can put your assets at risk. Use the "Add to wallet" button above — data sourced directly from chainid.network, the canonical Ethereum chain registry.

How to add Carbonium Testnet Network to your wallet

  1. 1

    Click Add to wallet

    Press the "Add to wallet" button above. MetaMask, OKX Wallet, Rabby Wallet or Trust Wallet will show a popup asking you to confirm adding the Carbonium Testnet Network network.

  2. 2

    Confirm in your wallet

    Your wallet shows the Carbonium Testnet Network network details: Chain ID 4040, native token tCBR. Verify the Chain ID is correct, then click "Approve" or "Add Network".

  3. 3

    Switch to the new network

    After confirming, your wallet automatically switches to Carbonium Testnet Network. You can start transacting right away — you will need tCBR to pay gas fees.

Carbonium Testnet Network network technical details

To add manually, go to Settings → Networks → Add Network in MetaMask (or your wallet's equivalent) and enter the details below:

NameCarbonium Testnet Network
Chain ID4040
Native tokentCBR
Decimals18
RPC Endpointhttps://rpc-dev.carbonium.network/
Block Explorerhttps://testnet.carboniumscan.com

Important notice

  • •Always verify Chain ID 4040 before confirming — attackers sometimes create fake networks with similar names but different Chain IDs
  • •You need tCBR tokens in your wallet to pay gas fees for transactions on Carbonium Testnet Network
  • •Data on this page is sourced from chainid.network — the community-verified Ethereum chain registry
  • •If the "Add to wallet" button doesn't work, your wallet may not support wallet_addEthereumChain — add the network manually using the details below

Frequently asked questions

Is it safe to add Carbonium Testnet Network to MetaMask?▾
Yes, if you use the "Add to wallet" button on this page. Data is sourced from chainid.network — the community-audited Ethereum registry. Adding a network does not expose your private key or grant any permissions to the dApp.
What is Carbonium Testnet Network Chain ID?▾
The Chain ID of Carbonium Testnet Network is 4040. This unique number identifies the network and prevents MetaMask and other EVM wallets from mixing up transactions across different chains.
Do I need tCBR tokens to use Carbonium Testnet Network?▾
Yes. Every transaction on Carbonium Testnet Network requires tCBR to pay gas fees. You can purchase tCBR on exchanges and bridge it to Carbonium Testnet Network, or use a faucet if this is a testnet.
What is the Carbonium Testnet Network RPC endpoint?▾
An RPC endpoint is the server address your wallet uses to communicate with the Carbonium Testnet Network blockchain — sending transactions, reading balances, and checking state. One popular Carbonium Testnet Network RPC is https://rpc-dev.carbonium.network/. This page shows live latency for each RPC so you can pick the fastest one.
My wallet says Carbonium Testnet Network already exists when I click Add — what do I do?▾
That's completely normal. If Carbonium Testnet Network is already in your wallet, it will simply switch to that network instead of adding a duplicate — no error or conflict.
I added Carbonium Testnet Network but the network won't load — what's wrong?▾
The most common cause is a broken or overloaded RPC endpoint. Your wallet uses RPC to connect to the blockchain — if the RPC is down, the network won't load even if it was added correctly. Fix: copy a different RPC from the list above (prefer green low-latency ones), then go to Settings → Networks in your wallet and replace the old RPC with the new one. Watch the tutorial video above for step-by-step instructions on updating your RPC.