Send Eth

gasPriceGwei is in Gwei for convenience.

EIP-1559 Transfer with Fee Suggestion

var transferService = web3.Eth.GetEtherTransferService();
var fee = await transferService.SuggestFeeToTransferWholeBalanceInEtherAsync();

var receipt = await transferService
    .TransferEtherAndWaitForReceiptAsync(
        toAddress, 0.1m,
        maxPriorityFee: fee.MaxPriorityFeePerGas.Value,
        maxFeePerGas: fee.MaxFeePerGas.Value);

Estimate Gas Before Sending

var transferService = web3.Eth.GetEtherTransferService();
var estimatedGas = await transferService.EstimateGasAsync(toAddress, 1.11m);

var receipt = await transferService
    .TransferEtherAndWaitForReceiptAsync(toAddress, 1.11m, gasPriceGwei: 2, estimatedGas);

Send Entire Balance (EIP-1559)

var transferService = web3.Eth.GetEtherTransferService();
var fee = await transferService.SuggestFeeToTransferWholeBalanceInEtherAsync();

var amount = await transferService
    .CalculateTotalAmountToTransferWholeBalanceInEtherAsync(
        fromAddress, maxFeePerGas: fee.MaxFeePerGas.Value);

var receipt = await transferService
    .TransferEtherAndWaitForReceiptAsync(
        destinationAddress, amount,
        fee.MaxPriorityFeePerGas.Value, fee.MaxFeePerGas.Value);

Multi-chain Support

var mainnet = new Account(privateKey, Chain.MainNet);    // Chain ID 1
var sepolia = new Account(privateKey, 11155111);          // Sepolia testnet
var polygon = new Account(privateKey, 137);               // Polygon mainnet
// Same address on all chains, only chain ID differs

Source: AccountTypesDocExampleTests.ShouldCreateAccountForDifferentChains

Manual Signing: Legacy Transaction

var signer = new LegacyTransactionSigner();
var receiverAddress = "0x13f022d72158410433cbd66f5dd8bf6d2d129924";
var amount = BigInteger.Parse("1000000000000000000"); // 1 ETH in wei
BigInteger nonce = 0;
BigInteger gasPrice = BigInteger.Parse("20000000000"); // 20 Gwei
BigInteger gasLimit = 21000;

var signedRlpHex = signer.SignTransaction(
    privateKey, receiverAddress, amount, nonce, gasPrice, gasLimit);

Source: SignerDocExampleTests.ShouldSignLegacyTransaction

Manual Signing: EIP-1559 Transaction

var signer = new Transaction1559Signer();
BigInteger chainId = 1;
BigInteger nonce = 0;
BigInteger maxPriorityFeePerGas = BigInteger.Parse("2000000000");  // 2 Gwei
BigInteger maxFeePerGas = BigInteger.Parse("100000000000");        // 100 Gwei
BigInteger gasLimit = 21000;
var receiverAddress = "0x13f022d72158410433cbd66f5dd8bf6d2d129924";
BigInteger amount = BigInteger.Parse("1000000000000000000");       // 1 ETH

var transaction = new Transaction1559(
    chainId, nonce, maxPriorityFeePerGas, maxFeePerGas,
    gasLimit, receiverAddress, amount, null, new List<AccessListItem>());

var signedRlpHex = signer.SignTransaction(privateKey, transaction);

Source: SignerDocExampleTests.ShouldSignEip1559Transaction

After manual signing, broadcast with:

await web3.Eth.Transactions.SendRawTransaction.SendRequestAsync("0x" + signedRlpHex);

Required Usings

using Nethereum.Web3;
using Nethereum.Web3.Accounts;
using Nethereum.Signer;
using Nethereum.Model;
using System.Collections.Generic;
using System.Numerics;