Nethereum provides typed, high-level services for interacting with major DeFi protocols and Ethereum ecosystem tools. Each integration wraps the protocol's smart contracts in a C# API — you get compile-time safety, automatic gas/nonce handling, and the same web3.Eth patterns used throughout Nethereum.
The Simple Path
| Task | Simple Path |
|---|
| Access Uniswap V4 | web3.UniswapV4() |
| Quote a swap price | uniswap.Pricing.Quoter.QuoteExactInputQueryAsync(params) |
| Execute a swap | uniswap.UniversalRouter.ExecuteRequestAndWaitForReceiptAsync(fn) |
| Manage liquidity | uniswap.Positions.Manager.ModifyLiquiditiesRequestAndWaitForReceiptAsync(fn) |
| Execute through Safe | new SafeAccount(safe, chainId, key) → any contract service auto-routes through Safe |
| Protect API with payments | app.UseX402(options => options.Routes.Add(new RoutePaymentConfig(...))) |
| Pay for API access | new X402HttpClient(http, key, options).GetAsync(url) |
| Query Circles balance | new GetTotalBalanceV2(client).SendRequestAsync(address) |
For every row above, Nethereum handles gas estimation, nonce management, EIP-1559 fee calculation, and transaction signing automatically. You only override when you need to.
Protocol Packages
| Package | Protocol | What It Does |
|---|
Nethereum.Uniswap | Uniswap V2/V3/V4 | Token swaps, liquidity positions, price quoting, Permit2, Universal Router |
Nethereum.GnosisSafe | Safe (Gnosis Safe) | Multi-signature transaction assembly, EIP-712 signing, SafeAccount, MultiSend |
Nethereum.X402 | x402 Protocol | HTTP 402 payments with EIP-3009 USDC transfers, ASP.NET middleware, client library |
Nethereum.Circles | Circles UBI | Balance queries, personal minting, trust management, transaction history |
Nethereum.Siwe | Sign-In with Ethereum | EIP-4361 authentication, session management, NFT gating, RECAP capabilities |
Nethereum.Siwe.Core | SIWE Core | Message model, parser, string builder, RECAP (EIP-5573) |
Guides
| Guide | What You'll Learn |
|---|
| Uniswap: Swap Tokens | Quote prices, execute swaps via Universal Router, handle slippage and price impact |
| Uniswap: Manage Liquidity | Create/increase/decrease positions, collect fees, atomic rebalancing |
| Gnosis Safe | Build multi-sig transactions, collect signatures, SafeAccount, MultiSend |
| x402 Payments | Protect API endpoints, accept USDC payments, EIP-3009 authorization flow |
| Circles UBI | Query balances, mint CRC, manage trust relationships on Gnosis Chain |
| SIWE Authentication | Sign-In with Ethereum, session management, NFT gating, smart contract wallets, RECAP capabilities |