Unity Quickstart

{
  "scopedRegistries": [
    {
      "name": "package.openupm.com",
      "url": "https://package.openupm.com",
      "scopes": ["com.nethereum.unity"]
    }
  ],
  "dependencies": {
    "com.nethereum.unity": "5.0.0",
    "com.unity.nuget.newtonsoft-json": "3.2.1"
  }
}

using UnityEngine;
using Nethereum.Web3;
using Nethereum.Unity.Rpc;
using System;

public class GetBlockNumber : MonoBehaviour
{
    public string Url = "https://ethereum-rpc.publicnode.com";

    async void Start()
    {
        var web3 = new Web3(new UnityWebRequestRpcTaskClient(new Uri(Url)));
        var blockNumber = await web3.Eth.Blocks.GetBlockNumber.SendRequestAsync();
        Debug.Log($"Block: {blockNumber.Value}");
    }
}

using Nethereum.Web3;
using Nethereum.Web3.Accounts;

var account = new Account("0xYOUR_PRIVATE_KEY", chainId: 31337);
var web3 = new Web3(account, "http://localhost:8545");

var receipt = await web3.Eth.GetEtherTransferService()
    .TransferEtherAndWaitForReceiptAsync("0xRecipient", 0.1m);
Debug.Log($"TX: {receipt.TransactionHash}");

using Nethereum.Unity.EIP6963;
using Nethereum.EIP6963WalletInterop;

var walletProvider = EIP6963WebglHostProvider.CreateOrGetCurrentInstance();

// Discover all installed wallets
var wallets = await walletProvider.GetAvailableWalletsAsync();
foreach (var wallet in wallets)
    Debug.Log($"Found: {wallet.Name} ({wallet.Rdns})");

// Select and connect
if (wallets.Length > 0)
{
    await walletProvider.SelectWalletAsync(wallets[0].Uuid);
    var account = await walletProvider.EnableProviderAsync();
    Debug.Log($"Connected: {account}");

    // Get Web3 — wallet handles signing
    var web3 = await walletProvider.GetWeb3Async();
    var balance = await web3.Eth.GetBalance.SendRequestAsync(walletProvider.SelectedAccount);
    Debug.Log($"Balance: {Web3.Convert.FromWei(balance.Value)} ETH");
}

walletProvider.SelectedAccountChanged += async (newAccount) =>
{
    Debug.Log($"Account switched: {newAccount}");
    return;  // implicit Task.CompletedTask
};

walletProvider.NetworkChanged += async (newChainId) =>
{
    Debug.Log($"Network switched: {newChainId}");
    return;
};

using Nethereum.Unity.Metamask;

var metamask = MetamaskWebglHostProvider.CreateOrGetCurrentInstance();
await metamask.EnableProviderAsync();
var web3 = await metamask.GetWeb3Async();

var receipt = await web3.Eth.GetEtherTransferService()
    .TransferEtherAndWaitForReceiptAsync("0xRecipient", 0.1m);

var erc20 = web3.Eth.ERC20.GetContractService(tokenAddress);

var name = await erc20.NameQueryAsync();
var symbol = await erc20.SymbolQueryAsync();
var decimals = await erc20.DecimalsQueryAsync();
var balance = await erc20.BalanceOfQueryAsync(ownerAddress);

Debug.Log($"{name} ({symbol}): {Web3.Convert.FromWei(balance, decimals)}");

private async Task<IWeb3> GetWeb3Async()
{
#if UNITY_WEBGL
    var walletProvider = EIP6963WebglHostProvider.CreateOrGetCurrentInstance();
    await walletProvider.EnableProviderAsync();
    return await walletProvider.GetWeb3Async();
#else
    var account = new Account(privateKey, chainId);
    return new Web3(account, url);
#endif
}

dotnet tool install -g Nethereum.Generator.Console

Nethereum.Generator.Console generate from-abi \
    -abi ./out/MyToken.abi \
    -bin ./out/MyToken.bin \
    -o ./SharedContracts \
    -ns MyGame.Contracts \
    -cn MyToken