Nethereum

.NET Developer Experience

Developers shouldn’t have to change their preferred development environment to work with Ethereum. We’ve built open source tools for you to start leveraging blockchain technology right away.

Simple Path First

web3.Eth handles gas estimation, nonce management, and EIP-1559 fees automatically. One line to query a balance, one line to send a transaction. Expanding the Ethereum ecosystem beyond JavaScript — F# and VB are also supported.

100+ Guides

docs.nethereum.com covers everything from balance queries to running an ERC-4337 bundler, with guides organised by what you want to do. Start developing without a deep blockchain background.

Local Dev Chain

dotnet new nethereum-devchain gives you an Aspire-orchestrated dev environment: DevChain node, PostgreSQL database, blockchain indexer, and Blazor explorer — all wired with service discovery and health checks.

Code Generation

Generate typed C# contract services from Solidity ABI using the VS Code Solidity extension, the CLI tool (Nethereum.Generator.Console), or MSBuild auto-generation on build.

Connect to any Ethereum or EVM-compatible chain, or run your own with DevChain. Use Infura, Geth, or any JSON-RPC endpoint. No external dependencies required.

What You Can Build

Nethereum includes 130+ packages organised into focused libraries. Every section links to guides on docs.nethereum.com.

Core Foundation

Send ETH, query balances, decode transactions, ABI encoding, EIP-1559 fees, EIP-7702 delegation, real-time streaming.

Smart Contracts

Deploy, call, and interact with contracts. Code generation from ABI, events, multicall, CREATE2, built-in ERC standards.

EVM Simulator

Simulate transactions in-process, preview state changes, step-through debug, decode nested call trees, disassemble bytecode.

DevChain

Local Ethereum node in .NET — no external dependencies. Fork live networks, trace transactions, integrate with .NET Aspire.

Account Abstraction

ERC-4337 bundler, smart account deployment, ERC-7579 modular accounts, paymasters, session keys, batch operations.

Data, Indexing & Explorer

Index to PostgreSQL/SQL Server/SQLite, token indexing, Blazor blockchain explorer with ABI decoding and contract interaction.

DeFi & Protocols

Uniswap V2/V3/V4 swaps, Gnosis Safe multi-sig, x402 crypto payments, Permit2, SIWE authentication, Circles UBI.

MUD Framework

Read, write, and query MUD table records. Index Store events to PostgreSQL. Deploy MUD Worlds with tables and systems.

Wallet SDK

Multi-platform wallet apps with Blazor, MAUI, and Avalonia. MVVM architecture, hardware wallet support, EVM simulation preview.

Blazor dApp Integration

Connect browser wallets (EIP-6963), MetaMask, WalletConnect. SIWE authentication. Dynamic contract interaction without codegen.

Unity

Ethereum integration for Unity games. WebGL wallet support, EIP-6963, smart contract interaction, cross-platform deployment.

AppChains (Preview)

Custom application chains with sequencer, RocksDB storage, multi-peer sync, L1 anchoring, and follower node verification.

For the full list of 100+ use cases, see What Do You Want to Do? on the documentation site.

See It In Action

From EVM simulation and transaction decoding to cross-chain portfolio management — see what Nethereum looks like in production.

.NET Aspire DevChain

One command gives you a complete Ethereum dev environment: dotnet new nethereum-devchain. Aspire orchestrates a DevChain node, PostgreSQL database, blockchain indexer, ERC-4337 bundler, and Blazor explorer — all wired with service discovery, health checks, and OpenTelemetry. Learn more

Aspire dashboard showing DevChain, Explorer, Indexer, Bundler, and PostgreSQL resources

Cross-Chain Portfolio Scanning

Scan token holdings across multiple chains simultaneously using multicall — no indexer required. The Wallet SDK queries ERC-20 balances directly from each chain's RPC, with live prices from CoinGecko via Token Services. Works with any EVM chain you add. Learn more

Explorer: Dashboard

Full Blazor Server blockchain explorer with live dashboard showing latest blocks and transactions. Built-in localisation (English, Spanish). Indexes to PostgreSQL with automatic token transfer tracking. Learn more

EVM Simulation & Transaction Preview

Before sending a transaction, simulate it entirely in-process. This Aave deposit shows the full EVM execution: nested contract calls, balance changes across tokens, decoded events, and gas costs — all computed locally without touching a node. Catch errors before they cost gas. Learn more

EVM simulation of an Aave deposit showing contract calls, balance changes, and decoded events

Blockchain Indexer & PostgreSQL Storage

Index blocks, transactions, event logs, ERC-20/721/1155 token transfers, and MUD table records to PostgreSQL, SQL Server, or SQLite. Run as a hosted service with resume-after-restart and reorg handling. The foundation that powers the explorer, token tracking, and MUD browsing. Learn more

PostgreSQL table view showing indexed blockchain data, tokens, and MUD tables

Pluggable Account Types

Create accounts from mnemonic phrases (12 or 24 words with optional passphrase), import private keys, add view-only addresses for monitoring, or connect hardware wallets like Trezor and Ledger. All stored in encrypted Web3 keystore format. Learn more

Account creation supporting mnemonic, private key, view-only, and Trezor hardware wallet

Explorer: Contract Interaction

Query and transact with any verified contract directly in the browser. Function calls are decoded with parameter names, receipt events are decoded automatically, and transaction history is fully browsable. Works with ABI from Sourcify, Etherscan, or 4Byte. Learn more

Contract interaction showing query, transact, receipt decoding with event decoding

Transfer with EVM Simulation

Send native ETH or any ERC-20 token with a built-in EVM simulation step. Before the transaction goes on-chain, you see exactly what will happen: balance changes, gas cost, and any potential reverts. Supported across all configured chains. Learn more

Explorer: MUD Tables

Browse MUD World tables directly in the explorer. Query and filter records, see table schemas, and inspect on-chain state from MUD-based applications. MUD Store events are indexed to PostgreSQL and normalised into queryable tables. Learn more

MUD World tables with querying and filtering in the blockchain explorer

Hardware Wallet Support

Full Trezor integration with PIN prompts, passphrase entry, and account index scanning. Supports legacy and modern derivation paths. Also works on mobile via USB with MAUI. Ledger support available too. Keys never leave the device. Learn more

Trezor hardware wallet integration with PIN prompt and account scanning

Explorer: Transaction Debugging

Step-through debug any transaction at the EVM opcode level directly in the browser. Inspect the stack, memory, storage, and program counter at each step. Decode nested call trees to understand complex contract-to-contract interactions. Learn more

EVM transaction debugging with opcode-level step-through

Portfolio with Live Prices

Token holdings with real-time pricing from CoinGecko. The portfolio view combines on-chain balance scanning (via multicall, independent of any indexer) with off-chain price feeds, giving you a complete picture of holdings across all configured chains. Learn more

Explorer: Wallet Connection (EIP-6963)

Connect browser wallets server-side in Blazor — not just WASM. EIP-6963 discovery automatically detects MetaMask, Brave Wallet, Coinbase Wallet, and any injected provider. Sign transactions and interact with contracts directly from the explorer. Learn more

EIP-6963 wallet discovery detecting MetaMask, Brave, and Coinbase wallets

Multi-Chain Configuration

Add any EVM-compatible chain. Configure single, random, or load-balanced RPC endpoints for privacy and reliability. For Ethereum mainnet, add a Beacon Chain endpoint to enable light client proof verification of balances — trustless state queries without trusting the RPC provider. Learn more

Chain configuration showing RPC endpoint management and Beacon Chain integration

Contract Call & Event Decoding

Every transaction is automatically decoded using ABI data from Sourcify, Etherscan, or 4Byte signature lookup. See function names, parameter values, and emitted events in human-readable form instead of raw hex. Works for any verified contract. Learn more

Decoded contract calls and events showing function names and parameter values

Mobile & Cross-Platform

The same Wallet SDK runs on desktop (Blazor, Avalonia) and mobile (MAUI on Android and iOS). MVVM architecture means shared ViewModels across all platforms — only the renderer changes. Hardware wallets work on mobile too via USB. Learn more

Nethereum Wallet SDK running on mobile devices

Unity Game Integration

Build blockchain games with Unity3d. Nethereum supports deployment to WebGL, iOS, Android, desktop, and consoles. Connect browser wallets via EIP-6963 discovery, interact with smart contracts using typed services, and manage in-game tokens and NFTs. Learn more

CafeCosmos - a Unity game using Nethereum for Ethereum integration

Nethereum Flappy

The original Nethereum Unity demo — a blockchain-powered Flappy Unicorn game. One of the first Ethereum games built with .NET and Unity3d, demonstrating smart contract interaction from a game engine. Still playable today.

Play Online | Source Code | Unity Docs

Bringing the love of .NET to Ethereum and viceversa

The Ethereum development platform for the .NET ecosystem — providing libraries and developer infrastructure for smart contracts, wallets, indexing, developer tooling, and blockchain applications.

Complete Development Stack

Every Platform

Production Ready

Nethereum makes it easy for .NET applications to use Ethereum, and for Ethereum applications to leverage .NET.

.NET Developer Experience

Developers shouldn’t have to change their preferred development environment to work with Ethereum. We’ve built open source tools for you to start leveraging blockchain technology right away.

Simple Path First

100+ Guides

Local Dev Chain

Code Generation

What You Can Build

Get Started

Focus on building. Nethereum provides a suite of open source libraries to help you start prototyping Ethereum applications in .NET quickly.

Quick Start Guide

Playground

Code Generation & Templates

Blockchain Explorer

Unity Integration

What Do You Want to Do?