Network
Launch Date
Consensus
Note
Sepolia
Oct 2021
PoW
Like-for-like representation of Ethereum
Görli
Jan 2019
PoA
Proof-of-Authority
Kiln
Mar 2022
PoS
Post-Merge (for ETH2), shadow fork of the mainnet
Kintsugi
Dec 2021
PoS
DEPRECATED, use Kiln; post-Merge (for ETH2)
Ropsten
Nov 2016
PoW
DEPRECATED, use Sepolia; the Merge to happen on Jun 8, 2022
Rinkeby
Apr 2017
PoA
DEPRECATED, use Görli and Görli Faucet
Kovan
Mar 2017
PoA
DEPRECATED, use Sepolia or Görli
List of active and deprecated Ethereum testnets, including Kintsugi.
Features
Optimistic rollup 
ZK-rollup 
Proof
Uses fraud proofs to prove transaction validity. 
Uses validity (zero-knowledge) proofs to prove transaction validity. 
Capital efficiency
Requires waiting through a 1-week delay (dispute period) before withdrawing funds. 
Users can withdraw funds immediately because validity proofs provide incontrovertible evidence of the authenticity of off-chain transactions. 
Data compression
Publishes full transaction data as calldata to Ethereum Mainnet, which increases rollup costs. 
Doesn't need to publish transaction data on Ethereum because ZK-SNARKs and ZK-STARKs already guarantee the accuracy of the rollup state. 
EVM compatibility
Uses a simulation of the Ethereum Virtual Machine (EVM), which allows it to run arbitrary logic and support smart contracts. 
Doesn't widely support EVM computation, although a few EVM-compatible ZK-rollups have appeared. 
Rollup costs
Reduces costs since it publishes minimal data on Ethereum and doesn't have to post proofs for transactions, except in special circumstances. 
Faces higher overhead from costs involved in generating and verifying proofs for every transaction block. ZK proofs require specialized, expensive hardware to create and have high on-chain verification costs. 
Trust assumptions
Doesn't require a trusted setup. 
Requires a trusted setup to work. 
Liveness requirements
Verifiers are needed to keep tabs on the actual rollup state and the one referenced in the state root to detect fraud. 
Users don't need someone to watch the L2 chain to detect fraud. 
Security properties 
Relies on cryptoeconomic incentives to assure users of rollup security. 
Relies on cryptographic guarantees for security. 
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--create-dirs
Testnets
ADD SEPOLIA TO METAMASK

How to Add the Sepolia Test Network to Your MetaMask Wallet

Connect Your MetaMask Wallet to the Sepolia Blockchain to Start Testing Your Smart Contracts and Decentralized Applications
Last Updated:
March 3, 2023
Table of Contents
Table of Contents
Table of Contents

{{building-alchemy-ad}}

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.

Create a free Alchemy account.

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.

1-click "Add to Wallet" button in the Alchemy dashboard.

Allow Alchemy to add the Sepolia network to your wallet.

Pop up box to allow Alchemy to add a Sepolia RPC URL 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”.

Add a network to Metamask.

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

Manually add a new network to MetaMask.

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

Copy your Sepolia RPC 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.

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Testnets
ADD SEPOLIA TO METAMASK

How to Add Sepolia to MetaMask

Connect Your MetaMask Wallet to the Sepolia Blockchain to Start Testing Your Smart Contracts and Decentralized Applications
Last Updated:
March 3, 2023
Last Updated:
March 14, 2023
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{{building-alchemy-ad}}

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.

Create a free Alchemy account.

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.

1-click "Add to Wallet" button in the Alchemy dashboard.

Allow Alchemy to add the Sepolia network to your wallet.

Pop up box to allow Alchemy to add a Sepolia RPC URL 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”.

Add a network to Metamask.

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

Manually add a new network to MetaMask.

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

Copy your Sepolia RPC 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.

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.

Create a free Alchemy account.

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.

1-click "Add to Wallet" button in the Alchemy dashboard.

Allow Alchemy to add the Sepolia network to your wallet.

Pop up box to allow Alchemy to add a Sepolia RPC URL 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”.

Add a network to Metamask.

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

Manually add a new network to MetaMask.

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

Copy your Sepolia RPC 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.

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