Connect with MetaMask

Connect MetaMask to Injective EVM Testnet

MetaMask is a browser wallet extension that lets you connect to any EVM-compatible network, including Injective EVM.

How to Install MetaMask

Install the official MetaMask extension from the MetaMask download page.

Add Injective EVM Testnet to MetaMask

1. Click the MetaMask icon in your browser and unlock your wallet.

2. Click the network selector at the top (the default is "Ethereum Mainnet").

3. Select “Add Network” or “Add a network manually” to open the custom network form.

Injective EVM Testnet Parameters

Fill in the following details:

Network Name: Injective EVM Testnet
Chain ID: 1439
RPC URL: https://k8s.testnet.json-rpc.injective.network/
Currency Symbol: INJ
Block Explorer URL: https://testnet.blockscout.injective.network/blocks

Note: Block Explorer URL is optional, powered by BlockScout.

Switch to Injective EVM Testnet

Once the network is added, use the network selector to switch to Injective EVM Testnet.

Fund Your Wallet (Optional)

Need Testnet INJ? Visit the Injective Testnet faucet.

Funds will appear once included in a Testnet block.

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You're All Set!

MetaMask is now connected to the Injective EVM Testnet. You can:

• Deploy smart contracts using tools like Foundry, Hardhat, or Remix.

• Interact with Testnet dApps and contracts.

• Inspect transactions via the Blockscout explorer.

Tip: Always double-check RPC URLs and Chain IDs - accuracy is crucial to avoid misconfiguration.

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Connect MetaMask via ethers.js

You can also connect MetaMask programmatically using ethers.

Sample Code

import { ethers } from 'ethers';

export const INJECTIVE_EVM_PARAMS = {
  chainId: '0x59f', // 1439 in hexadecimal
  chainName: 'Injective EVM',
  rpcUrls: ['https://k8s.testnet.json-rpc.injective.network/'],
  nativeCurrency: {
    name: 'Injective',
    symbol: 'INJ',
    decimals: 18,
  },
  blockExplorerUrls: ['https://testnet.blockscout.injective.network/blocks'],
};

export async function connectMetaMask() {
  if (typeof window.ethereum === 'undefined') {
    alert('MetaMask not installed!');
    return;
  }

  const provider = new ethers.providers.Web3Provider(window.ethereum);

  try {
    await window.ethereum.request({
      method: 'wallet_addEthereumChain',
      params: [INJECTIVE_EVM_PARAMS],
    });

    await provider.send('eth_requestAccounts', []);
    const signer = provider.getSigner();
    const address = await signer.getAddress();

    console.log('Connected address:', address);
    return { provider, signer, address };
  } catch (err) {
    console.error('MetaMask connection failed:', err);
  }
}

Using ethers.js to interact with your smart contract

Sample code

counter contract ABI:

// abi/counterAbi.ts
[
	{
		"anonymous": false,
		"inputs": [
			{
				"indexed": true,
				"internalType": "address",
				"name": "sender",
				"type": "address"
			},
			{
				"indexed": false,
				"internalType": "string",
				"name": "reason",
				"type": "string"
			}
		],
		"name": "UserRevert",
		"type": "event"
	},
	{
		"anonymous": false,
		"inputs": [
			{
				"indexed": true,
				"internalType": "address",
				"name": "sender",
				"type": "address"
			},
			{
				"indexed": false,
				"internalType": "uint256",
				"name": "newValue",
				"type": "uint256"
			}
		],
		"name": "ValueSet",
		"type": "event"
	},
	{
		"inputs": [],
		"name": "increment",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [],
		"name": "number",
		"outputs": [
			{
				"internalType": "uint256",
				"name": "",
				"type": "uint256"
			}
		],
		"stateMutability": "view",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "uint256",
				"name": "newNumber",
				"type": "uint256"
			}
		],
		"name": "setNumber",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	},
	{
		"inputs": [
			{
				"internalType": "string",
				"name": "reason",
				"type": "string"
			}
		],
		"name": "userRevert",
		"outputs": [],
		"stateMutability": "nonpayable",
		"type": "function"
	}
]

import { ethers } from 'ethers'
import { INJECTIVE_EVM_PARAMS } from './config' // From separate file
import { counterAbi } from './abi/counterAbi'

// Replace with your deployed contract address
const contractAddress = '0xYourContractAddressHere'

async function connectAndInteract() {
  if (!window.ethereum) {
    alert('MetaMask is not installed!')
    return
  }

  // Request Injective EVM Network be added to MetaMask
  await window.ethereum.request({
    method: 'wallet_addEthereumChain',
    params: [
      {
        chainId: INJECTIVE_EVM_PARAMS.chainHex,
        chainName: INJECTIVE_EVM_PARAMS.chainName,
        rpcUrls: [INJECTIVE_EVM_PARAMS.rpcUrl],
        nativeCurrency: INJECTIVE_EVM_PARAMS.nativeCurrency,
        blockExplorerUrls: [INJECTIVE_EVM_PARAMS.blockExplorer],
      },
    ],
  })

  const provider = new ethers.providers.Web3Provider(window.ethereum)
  await provider.send('eth_requestAccounts', [])
  const signer = provider.getSigner()
  const userAddress = await signer.getAddress()
  console.log('Connected as:', userAddress)

  // Contract instance
  const contract = new ethers.Contract(contractAddress, counterAbi, signer)

  // Send transaction to increment
  const tx = await contract.increment()
  console.log('Transaction sent:', tx.hash)

  const receipt = await tx.wait()
  console.log('Transaction mined in block:', receipt.blockNumber)
}

connectAndInteract().catch(console.error)

Using viem to interact with your smart contract

Sample code

import { createWalletClient, custom, defineChain, formatEther } from 'viem'
import { INJECTIVE_EVM_PARAMS } from './config'
import { counterAbi } from './abi/counterAbi'
import { createPublicClient, http } from 'viem'

// Replace with your deployed contract address
const contractAddress = '0xYourContractAddressHere'

async function connectAndInteract() {
  if (typeof window === 'undefined' || typeof window.ethereum === 'undefined') {
    alert('MetaMask is not installed!')
    return
  }

  const client = createWalletClient({
    chain: INJECTIVE_EVM_PARAMS,
    transport: custom(window.ethereum),
  })

  // Create a PublicClient for reading contract state
  const publicClient = createPublicClient({
    chain: injectiveEvm,
    transport: http(),
  })

  const [account] = await client.requestAddresses()
  console.log('Connected account:', account)

  // Send transaction to increment using wallet client
  const hash = await client.writeContract({
    address: contractAddress,
    abi: counterAbi,
    functionName: 'increment',
    account,
  })

  console.log('Transaction sent with hash:', hash)
}

connectAndInteract().catch(console.error)