How to Add Sepolia to MetaMask

Written by Brady Werkheiser

Published on March 3, 20232 min read

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To test a decentralized application before deploying it to the Ethereum mainnet, web3 developers will deploy their smart contracts on a public testnet. Sepolia is a Proof-of-Stake testnet, and a popular test blockchain developers use to validate the functionality of their dapps before migrating them to Ethereum’s layer one blockchain.

This article will explain how to create a free Sepolia RPC endpoint on Alchemy so you can start deploying your smart contracts on the Sepolia testnet.

Once you're done adding Sepolia to MetaMask, you can get free SepoliaETH from Alchemy's Sepolia Faucet.

1. Sign Up for Alchemy

If you do not have an Alchemy account, create a free account. If you have an account, please sign in.

Alchemy’s free tier provides Sepolia testnet support, and gives developers access to the largest free plan in web3. Get access to full archive data, no daily request limits, access enhanced APIs, and 300,000,000 compute units per month on Supernode, the most reliable, scalable, and accurate RPC node solution in web3.

2. Create a Sepolia Application

From your dashboard, click the “create app” button. Next, complete the information about your dapp including:

1. Dapp Name - name your app

2. Description - describe your app

3. Chain - Choose “Ethereum”

4. Network - Choose “Sepolia”

3. Add Sepolia to MetaMask Automatically

Alchemy provide's a 1-click tool for adding your new Sepolia RPC endpoint to MetaMask.

First, open your new dapp, and then click the "Add to Wallet" button.

Allow Alchemy to add the Sepolia network to your wallet.

That's it!

How to Add Sepolia to MetaMask Manually

To start deploying smart contracts and interacting with test applications on the Sepolia test network, you need to connect your wallet to the Sepolia network.

To add the Sepolia testnet to MetaMask, click the network button at the top of your wallet and click “Add Network”.

At the bottom of the page, click “Add a network manually”. 

Next, go to your Alchemy dashboard, click "View Key" and then copy the “HTTPS URL”. 

Go back to MetaMask and paste your Sepolia RPC URL into the network configuration details along with the following information:

• Network Name - Sepolia Testnet

• New RPC URL - https://eth-sepolia.g.alchemy.com/v2/[YOUR-API-KEY]

• Chain ID - 11155111

• Currency Symbol - SepoliaETH

• Block explorer URL - https://sepolia.etherscan.io/

Now your MetaMask wallet is connected to Sepolia.

The last step is to get free SepoliaETH from a faucet.

Frequently Asked Questions

What is Sepolia testnet and why would I use it with MetaMask?

Sepolia is a Proof-of-Stake testnet that web3 developers use to test decentralized applications before deploying them to Ethereum mainnet, allowing safe validation without risking real ETH.

How do I manually add Sepolia network to MetaMask?

Click the network button at the top of MetaMask, select "Add Network," then "Add a network manually" and enter the Sepolia network configuration details.

Where do I get my Alchemy RPC URL for Sepolia?

In your Alchemy dashboard, go to your Sepolia app, click "View Key" and copy the HTTPS URL to use as your RPC endpoint.

How can I get free test ETH for Sepolia after adding the network?

Visit Alchemy's Sepolia Faucet to get free SepoliaETH for testing your applications.

Does Alchemy's free tier support Sepolia testnet?

Yes, Alchemy's free tier includes Sepolia testnet support with no daily request limits and 30M compute units per month.