How to Add Sepolia to MetaMask Wallet

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Adding the Sepolia test network to your MetaMask wallet is a crucial step for developers and enthusiasts looking to test decentralized applications (dApps) in a safe, no-risk environment. This guide walks you through the complete process of configuring Sepolia on MetaMask using Alchemy, including both automatic and manual setup methods. Whether you're building smart contracts or exploring Ethereum-based dApps, this step-by-step tutorial ensures you're ready to test on one of Ethereum’s most reliable proof-of-stake testnets.

👉 Discover how to connect to Ethereum testnets securely and start testing dApps today.

Understanding the Sepolia Testnet

Sepolia is a proof-of-stake (PoS) Ethereum testnet developed and maintained by the Ethereum Foundation. It was introduced as the successor to the now-deprecated Goerli testnet, offering developers a stable and scalable environment for testing smart contracts and dApps before deploying them on the Ethereum mainnet.

Key features of the Sepolia testnet include:

Because of these advantages, Sepolia has become the go-to testnet for Ethereum developers worldwide.

Step-by-Step Guide to Add Sepolia to MetaMask

Follow these clear, actionable steps to integrate the Sepolia network into your MetaMask wallet using Alchemy as your RPC provider.

Step 1: Create a Free Alchemy Account

To access the Sepolia RPC URL, you'll need an API provider. Alchemy is one of the most trusted platforms offering robust infrastructure for Ethereum development.

  1. Visit alchemy.com and sign up for a free account.
  2. Once registered, log in to your Alchemy dashboard.

The free tier includes everything you need for testnet development: unlimited API requests, full archive node access, and enhanced developer tools.

Step 2: Set Up a Sepolia Application on Alchemy

Creating a dedicated application ensures you get a unique RPC endpoint for your project.

  1. From your Alchemy dashboard, click "Create App".

  2. Fill in the required details:

    • App Name: Choose a descriptive name (e.g., "My Sepolia Test").
    • Description: Optional, but helpful for organization.
    • Chain: Select Ethereum.
    • Network: Choose Sepolia.
  3. Click "Create App" to finalize.

Your application will now appear in your app list, ready for integration.

Step 3: Connect Sepolia to MetaMask

You can add Sepolia to MetaMask in two ways—automatically or manually. Choose the method that best suits your workflow.

Option 1: Automatic Setup Using “Add to Wallet”

This is the fastest way if you're using a compatible browser extension.

  1. Open your newly created Sepolia app on Alchemy.
  2. Click the "Add to Wallet" button.
  3. Confirm the action in your MetaMask extension when prompted.
  4. The network will be added automatically with all correct settings.

This method eliminates manual entry errors and saves time during setup.

👉 Learn how top developers streamline their blockchain testing workflows.

Option 2: Manual Configuration in MetaMask

For full control over network settings, follow this manual process:

  1. Open your MetaMask extension.
  2. Click your network selector (top-left) and choose "Add Network".
  3. Select "Add a Network Manually".

  4. Enter the following details:

    • Network Name: Sepolia Testnet
    • New RPC URL: Paste the HTTPS URL from your Alchemy app (found under "View Key")
    • Chain ID: 11155111
    • Currency Symbol: SEP (or ETH if preferred; some use SPI)
    • Block Explorer URL: https://sepolia.etherscan.io
  5. Click "Save".

MetaMask will validate the connection and switch to the Sepolia network upon success.

Exploring dApps on the Sepolia Testnet

Once configured, you can begin interacting with real-world dApps deployed on Sepolia. Many leading Ethereum projects use this testnet for public beta testing. Popular dApps available on Sepolia include:

These platforms allow you to simulate trades, supply liquidity, mint assets, and more—all without spending real funds.

To get started, visit the Sepolia version of any dApp and connect your MetaMask wallet. You’ll just need some test ETH first.

Getting Test ETH from a Sepolia Faucet

Since Sepolia is a testnet, real money isn’t used. Instead, obtain free test ETH from trusted faucets such as:

Simply enter your MetaMask wallet address, complete any required verification (like captcha or social tasks), and receive test tokens within minutes.

Why Use Sepolia for Development?

Sepolia stands out due to its stability, active community support, and alignment with Ethereum’s current PoS architecture. Unlike older testnets that relied on proof-of-work, Sepolia accurately reflects mainnet conditions—making it ideal for:

Its robust infrastructure reduces unexpected behavior during mainnet launches, significantly lowering deployment risks.

👉 See how integrating testnets early improves dApp reliability and performance.

Frequently Asked Questions (FAQs)

What is the Chain ID for Sepolia?

The Chain ID for the Sepolia testnet is 11155111. This number uniquely identifies the network and must be entered correctly when manually adding it to MetaMask.

How do I manually add Sepolia to MetaMask?

Go to MetaMask > Settings > Networks > Add Network. Enter:

What is the RPC URL for Sepolia?

The RPC URL is specific to your project and provider. On Alchemy, it follows this format:
https://eth-sepolia.g.alchemy.com/v2/YOUR_API_KEY
Replace YOUR_API_KEY with your actual key from the Alchemy dashboard.

Can I use the same wallet on Sepolia as on Ethereum mainnet?

Yes. Your MetaMask wallet works across networks. Just ensure you’re sending transactions on the correct network—never send real ETH to a testnet address.

Is Sepolia replacing Goerli?

Yes. Goerli has been deprecated after the Ethereum Shanghai upgrade. Sepolia is now the recommended public PoS testnet for Ethereum development.

How do I add Arbitrum Sepolia to MetaMask?

The process mirrors standard Sepolia setup. Obtain the Arbitrum Sepolia RPC URL from Alchemy or another provider, then manually input:

Final Thoughts

Configuring the Sepolia testnet in MetaMask opens the door to realistic, risk-free experimentation with Ethereum’s ecosystem. By leveraging tools like Alchemy and public faucets, developers can simulate mainnet conditions with precision. Whether you're testing contract logic, UI flows, or integration points, Sepolia provides a dependable foundation for innovation.

With this guide, you now have everything needed to set up, fund, and begin using the Sepolia network confidently—paving the way for successful dApp development and deployment.

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