Deploy a Smart Contract on Blast

This guide covers adding the network to a browser wallet, then deploying a simple contract using Foundry and Hardhat — pick whichever you prefer.

Blast is EVM-equivalent, so contracts deploy using the standard Solidity toolchain — Foundry, Hardhat, or Remix — with a GetBlock endpoint. This guide covers adding the network to a wallet and deploying a first contract to Blast.

Prerequisites

• Node.js 18+ and a package manager, or Foundry

• An EVM wallet (such as MetaMask) with ETH on Blast for gas — see Add Network to Your Wallet and Funding Your Deployer

• A GetBlock access token — the endpoint is https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/

• A funded deployer address with ETH on Blast

Network Details

Property	Value
Network Name	Blast Mainnet
RPC URL	https://shared.eu-central-1.getblock.io//
Chain ID	81457 (0x13e31)
Currency Symbol	ETH
Block Explorer	blastscan.io

Add Network to Your Wallet

Ethereum Mainnet is pre-configured in MetaMask by default. Blast is not, so it must be added manually — use the button below or the manual steps that follow.

1

Open your wallet

Open MetaMask (or your EVM wallet of choice).

2

Add a custom network

Open the network selector and choose Add a custom network.

3

Enter the network details

Enter the values from the Network Details table above.

4

Confirm the Chain ID

Confirm the Chain ID resolves to 81457.

5

Save and switch networks

Save and switch to the newly added Blast network.

Funding Your Deployer

Blast gas is paid in ETH that has been bridged from Ethereum.

• Mainnet — bridge ETH from Ethereum L1 using the official Blast Bridge. Bridged ETH becomes spendable on Blast for gas and begins auto-rebasing.

• Testnet (Blast Sepolia, chain ID 168587773) — obtain Ethereum Sepolia ETH from a public Sepolia faucet, then bridge it to Blast Sepolia with the Blast Bridge in testnet mode.

Deploy with Foundry

1

Install Foundry and initialize

curl -L https://foundry.paradigm.xyz | bash
foundryup
forge init hello-blast && cd hello-blast

2

Write the contract

src/Hello.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

contract Hello {
    string public greeting = "Hello, Blast";

    function setGreeting(string calldata greeting_) external {
        greeting = greeting_;
    }
}

3

Deploy

export BLAST_RPC_URL=https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/
export PRIVATE_KEY=0xyour_deployer_private_key

forge create src/Hello.sol:Hello \
  --rpc-url $BLAST_RPC_URL \
  --private-key $PRIVATE_KEY \
  --broadcast

4

Verify on the block explorer

Blast uses a Blastscan (Etherscan-compatible) explorer:

forge verify-contract <DEPLOYED_ADDRESS> src/Hello.sol:Hello \
  --chain-id 81457 \
  --verifier etherscan \
  --verifier-url https://api.blastscan.io/api \
  --etherscan-api-key <BLASTSCAN_API_KEY>

Deploy with Hardhat

1

Create the project

mkdir hello-blast && cd hello-blast
npm init --yes
npm install --save-dev hardhat
npx hardhat init

2

Configure the network

hardhat.config.js

require('@nomicfoundation/hardhat-toolbox');

const BLAST_CHAIN_ID = 81457;

module.exports = {
  solidity: '0.8.24',
  networks: {
    blast: {
      url: process.env.BLAST_RPC_URL,
      chainId: BLAST_CHAIN_ID,
      accounts: [process.env.PRIVATE_KEY]
    }
  },
  etherscan: {
    apiKey: { blast: process.env.BLASTSCAN_API_KEY },
    customChains: [
      {
        network: 'blast',
        chainId: BLAST_CHAIN_ID,
        urls: {
          apiURL: 'https://api.blastscan.io/api',
          browserURL: 'https://blastscan.io'
        }
      }
    ]
  }
};

3

Write the contract

contracts/Hello.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

contract Hello {
    string public greeting = "Hello, Blast";

    function setGreeting(string calldata greeting_) external {
        greeting = greeting_;
    }
}

4

Deploy

export BLAST_RPC_URL=https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/
export PRIVATE_KEY=0xyour_deployer_private_key

npx hardhat ignition deploy ./ignition/modules/Hello.js --network blast

5

Verify on the block explorer

export BLASTSCAN_API_KEY=your_blastscan_api_key
npx hardhat verify --network blast <DEPLOYED_ADDRESS>

On Blast, a contract's ETH and USDB balances default to the VOID yield mode (no rebasing). To make a deployed contract's balance accrue yield, configure its yield mode through the Blast yield predeploy at 0x4300000000000000000000000000000000000002 — see the Blast documentation for the configure interface.