> ## Documentation Index
> Fetch the complete documentation index at: https://metalayerlabs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Hardhat

[Hardhat](https://hardhat.org/) is an Ethereum development environment for professionals. It facilitates performing frequent tasks, such as running tests, automatically checking code for mistakes or interacting with a smart contract.

For deterministic deployments using create2 factory contracts, see [this guide](https://docs.blast.io/building/utility-contracts#deterministic-deployments).

# Using Hardhat with Blast

```
networks: {
   // for mainnet
   "blast-mainnet": {
     url: "coming end of February",
     accounts: [process.env.PRIVATE_KEY as string],
     gasPrice: 1000000000,
   },
   // for Sepolia testnet
   "blast-sepolia": {
     url: "https://sepolia.blast.io",
     accounts: [process.env.PRIVATE_KEY as string]
     gasPrice: 1000000000,
   },
   // for local dev environment
   "blast-local": {
     url: "http://localhost:8545",
     accounts: [process.env.PRIVATE_KEY as string],
     gasPrice: 1000000000,
   },
 },
 defaultNetwork: "blast-local",
```