Ethereum Playground

Learn Ethereum by doing.

A hands-on playground for learning how Ethereum works: create and recover wallets, send ETH, and write, deploy and inspect smart contracts — on the Sepolia test network unless you pick another.

Check a balance See all tools

Your first contract

pragma solidity ^0.8.20;
contract Counter {
    uint public count = 0;
    function get() public view returns (uint) {
        return count;
    }
    function increment() public {
        count += 1;
    }
    function reset() public {
        count = 0;
    }
}

Counter.sol · Solidity 0.8

Deploy it on Sepolia

What you can try

Check Balance

Look up the ETH balance of any address on mainnet or Sepolia, straight from a public node — no account, no connection prompt.

Create Wallet

Generate a fresh key pair and mnemonic in your browser. The private key is never sent anywhere — copy it before you leave the page.

Recover Wallet

Restore an account from its twelve-word seed phrase and get the matching address and private key back.

Transfer ETH

Send a transaction on the network you have selected and watch it go from broadcast to confirmed, with the hash linked to Etherscan.

Deploy & Inspect Contracts

Write Solidity in the editor, compile it, and deploy — then read any deployed contract back by address.

Before you start

Learn on a test network

Sepolia behaves like mainnet, but its ETH costs nothing — every tool starts there. Switch to mainnet only when you mean to spend real ETH.

Never share a private key or seed phrase

Anything you paste here stays in your browser and is never sent to us. The same is not true elsewhere — whoever has your key has your funds.