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This page is updated regularly as the network information is updated. TAC EVM is a standard EVM chain based on Cosmos with native EVM integration. These are the chain parameters for TAC networks:
TAC Turin has been deprecated. Please use the Saint Petersburg Testnet for your nodes and applications.

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Network Configuration

TAC Mainnet - Production network for live applications
ParameterValue
Network NameTAC Mainnet
RPC Endpointhttps://rpc.tac.build
Chain ID239
Currency SymbolTAC
Block Explorerhttps://explorer.tac.build
Fee SchemaEIP-1559

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Quick Add to Wallet

{
  "chainId": "0xEF",
  "chainName": "TAC Mainnet",
  "rpcUrls": ["https://rpc.tac.build"],
  "nativeCurrency": {
    "name": "TAC",
    "symbol": "TAC",
    "decimals": 18
  },
  "blockExplorerUrls": ["https://explorer.tac.build"]
}

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Getting Testnet Tokens

Visit the Faucet

Go to https://spb.faucet.tac.build to access the Saint Petersburg testnet faucet.

Connect Your Wallet

Connect your Ethereum wallet (MetaMask, etc.) and ensure you’re on the Saint Petersburg testnet.

Request Tokens

Request testnet TAC tokens for gas fees and testing your applications.

Start Building

Use the tokens to deploy contracts and test your hybrid dApps on the testnet.

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Common Integration Issues

Adding TAC Networks:
  1. Open MetaMask settings
  2. Go to “Networks” → “Add Network”
  3. Use the network parameters above
  4. Save and switch to the new network
Common Issues:
  • Ensure Chain ID is entered as a number (239, 2391)
  • Verify RPC URLs are correct
  • Check that you’re using the latest MetaMask version