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Callisto Testnet Deprecated

Add Callisto Testnet Deprecated to Your Wallet — MetaMask, OKX, Rabby, Trust Wallet

Testnet
Chain ID: 821·Symbol: TCLO

Callisto Testnet Deprecated is an EVM-compatible blockchain with Chain ID 821 and native token TCLO. This page lets you add Callisto Testnet Deprecated to MetaMask, Rabby Wallet, OKX Wallet or Trust Wallet in one click — no manual Chain ID or RPC entry required.

What is Callisto Testnet Deprecated?

Callisto Testnet Deprecated 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 Callisto Testnet Deprecated once you add the network configuration.

Why do you need to add Callisto Testnet Deprecated to your wallet?

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

  2. 2

    Confirm in your wallet

    Your wallet shows the Callisto Testnet Deprecated network details: Chain ID 821, native token TCLO. 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 Callisto Testnet Deprecated. You can start transacting right away — you will need TCLO to pay gas fees.

Callisto Testnet Deprecated network technical details

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

NameCallisto Testnet Deprecated
Chain ID821
Native tokenTCLO
Decimals18

Important notice

  • •Always verify Chain ID 821 before confirming — attackers sometimes create fake networks with similar names but different Chain IDs
  • •You need TCLO tokens in your wallet to pay gas fees for transactions on Callisto Testnet Deprecated
  • •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 Callisto Testnet Deprecated 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 Callisto Testnet Deprecated Chain ID?▾
The Chain ID of Callisto Testnet Deprecated is 821. This unique number identifies the network and prevents MetaMask and other EVM wallets from mixing up transactions across different chains.
Do I need TCLO tokens to use Callisto Testnet Deprecated?▾
Yes. Every transaction on Callisto Testnet Deprecated requires TCLO to pay gas fees. You can purchase TCLO on exchanges and bridge it to Callisto Testnet Deprecated, or use a faucet if this is a testnet.
What is the Callisto Testnet Deprecated RPC endpoint?▾
An RPC endpoint is the server address your wallet uses to communicate with the Callisto Testnet Deprecated blockchain — sending transactions, reading balances, and checking state. This page shows live latency for each RPC so you can pick the fastest one.
My wallet says Callisto Testnet Deprecated already exists when I click Add — what do I do?▾
That's completely normal. If Callisto Testnet Deprecated is already in your wallet, it will simply switch to that network instead of adding a duplicate — no error or conflict.
I added Callisto Testnet Deprecated 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.