Metamask: Issue – Unable to deploy to Polygon Mumbai network with dedicated RPC URL

As a blockchain developer, deploying smart contracts and decentralized applications (dApps) is a crucial step in the development process. However, when it comes to deploying to the Polygon Mumbai network, issues can arise due to connectivity issues or configuration errors.

In this article, we will explore an issue reported by several users who are having trouble deploying their Metamask-based contracts to the Polygon Mumbai network using a dedicated Remote Procedure Call (RPC) URL from Infura.

The issue:

After setting up the necessary infrastructure and configuring the RPC URL, developers have encountered issues when attempting to deploy their contracts. Specifically:

• Deployment Failed: The contract was not deployed as expected, even after attempting to interact with it via the MetaMask interface.

• RPC Connection Error: While trying to connect to the Polygon Mumbai network, the user encountered an error during the connection process.

The Solution:

To resolve these issues and successfully deploy contracts on the Polygon Mumbai network with Metamask, follow these steps:

Step 1: Update your Infura URL

Before attempting to deploy your contract, update the INFURA_URL environment variable in your project to point to the correct RPC endpoint for the Polygon Mumbai network.

export INFURA_URL="

Replace YOUR_PROJECT_ID with your actual Infura project ID.

Step 2: Verify your connection

Make sure you can successfully connect to the RPC endpoint using MetaMask. You can do this by creating a new wallet and then verifying that it is connected to your Ethereum account.

npx polygon-cli connect --rpcurl  --etherscan apiKey=YOUR_ETHERSCAN_API_KEY

Replace YOUR_PROJECT_ID with your actual Infura project ID and YOUR_ETHERSCAN_API_KEY with your EthereumSCAN API key.

Step 3: Configure RPC options

If you are having trouble connecting to the Polygon Mumbai network, try configuring RPC options using the rpc_url argument in your contract deployment script. The following example shows how to configure the rpc_url option:

import { deploy } from 'ethers';
const provider = new ethers.providers.InfuraProvider(' {
network: 'mumbai',
rpcUrls: {
mainnet: '
test: '
},
});
export async function deployContract() {
const contractAddress = '0x...';
// Define the ABI of your contract
const abi = [...];
try {
const tx = await deploy(contractAddress, provider, { abi });
console.log(tx);
} catch (error) {
console.error(error);
}
}

Replace YOUR_PROJECT_ID with your actual Infura project ID and the contractAddress variable with your contract address.

Step 4: Update the RPC URL in Metamask

After updating the INFURA_URL environment variable, update the RPC URL in your MetaMask interface to point to the correct endpoint for the Polygon Mumbai network. You can do this by creating a new wallet and then checking if it is connected to your Ethereum account.

npx polygon-cli connect --rpcurl  --etherscan apiKey=YOUR_ETHERSCAN_API_KEY

Replace YOUR_PROJECT_ID with your actual Infura project ID and YOUR_ETHERSCAN_API_KEY with your EthereumSCAN API key.

Additional tips

• Make sure you have the latest version of Metamask installed and configured for Polygon Mumbai.

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