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Colossus Sepolia Testnet

Add Colossus Sepolia Testnet to Your Wallet — MetaMask, OKX, Rabby, Trust Wallet

Testnet
Chain ID: 9511·Symbol: ETH

Colossus Sepolia Testnet is an EVM-compatible blockchain with Chain ID 9511 and native token ETH. This page lets you add Colossus Sepolia Testnet to MetaMask, Rabby Wallet, OKX Wallet or Trust Wallet in one click — no manual Chain ID or RPC entry required.

RPC Endpoints
https://rpc.testnet.colossus.credit

Block Explorer

colossus-scout

What is Colossus Sepolia Testnet?

Colossus Sepolia Testnet 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 Colossus Sepolia Testnet once you add the network configuration.

Why do you need to add Colossus Sepolia Testnet to your wallet?

MetaMask and most wallets only come pre-configured with Ethereum Mainnet. To transact, swap tokens, or use dApps on Colossus Sepolia Testnet, 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 Colossus Sepolia Testnet 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 Colossus Sepolia Testnet network.

  2. 2

    Confirm in your wallet

    Your wallet shows the Colossus Sepolia Testnet network details: Chain ID 9511, native token ETH. 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 Colossus Sepolia Testnet. You can start transacting right away — you will need ETH to pay gas fees.

Colossus Sepolia Testnet network technical details

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

NameColossus Sepolia Testnet
Chain ID9511
Native tokenETH
Decimals18
RPC Endpointhttps://rpc.testnet.colossus.credit
Block Explorerhttps://explorer.testnet.colossus.credit

Important notice

  • •Always verify Chain ID 9511 before confirming — attackers sometimes create fake networks with similar names but different Chain IDs
  • •You need ETH tokens in your wallet to pay gas fees for transactions on Colossus Sepolia Testnet
  • •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 Colossus Sepolia Testnet 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 Colossus Sepolia Testnet Chain ID?▾
The Chain ID of Colossus Sepolia Testnet is 9511. This unique number identifies the network and prevents MetaMask and other EVM wallets from mixing up transactions across different chains.
Do I need ETH tokens to use Colossus Sepolia Testnet?▾
Yes. Every transaction on Colossus Sepolia Testnet requires ETH to pay gas fees. You can purchase ETH on exchanges and bridge it to Colossus Sepolia Testnet, or use a faucet if this is a testnet.
What is the Colossus Sepolia Testnet RPC endpoint?▾
An RPC endpoint is the server address your wallet uses to communicate with the Colossus Sepolia Testnet blockchain — sending transactions, reading balances, and checking state. One popular Colossus Sepolia Testnet RPC is https://rpc.testnet.colossus.credit. This page shows live latency for each RPC so you can pick the fastest one.
My wallet says Colossus Sepolia Testnet already exists when I click Add — what do I do?▾
That's completely normal. If Colossus Sepolia Testnet is already in your wallet, it will simply switch to that network instead of adding a duplicate — no error or conflict.
I added Colossus Sepolia Testnet 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.