{"id":28707838,"url":"https://github.com/nethereum/nethereum.uniswap-example","last_synced_at":"2025-06-14T17:34:19.213Z","repository":{"id":57665311,"uuid":"330689663","full_name":"Nethereum/Nethereum.Uniswap-Example","owner":"Nethereum","description":"Uniswap V2, V3, V4 Universal Router, Permit2 get started to work with Nethereum","archived":false,"fork":false,"pushed_at":"2025-03-17T15:43:17.000Z","size":59434,"stargazers_count":32,"open_issues_count":10,"forks_count":14,"subscribers_count":3,"default_branch":"main","last_synced_at":"2025-05-03T00:36:13.828Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":"","language":"Solidity","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"apache-2.0","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/Nethereum.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null}},"created_at":"2021-01-18T14:21:40.000Z","updated_at":"2025-03-18T02:33:30.000Z","dependencies_parsed_at":"2025-05-03T00:47:42.542Z","dependency_job_id":null,"html_url":"https://github.com/Nethereum/Nethereum.Uniswap-Example","commit_stats":null,"previous_names":["nethereum/nethereum.uniswap-example","nethereum/nethereum.uniswap-v2-and-v3"],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/Nethereum/Nethereum.Uniswap-Example","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Nethereum%2FNethereum.Uniswap-Example","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Nethereum%2FNethereum.Uniswap-Example/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Nethereum%2FNethereum.Uniswap-Example/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Nethereum%2FNethereum.Uniswap-Example/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/Nethereum","download_url":"https://codeload.github.com/Nethereum/Nethereum.Uniswap-Example/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Nethereum%2FNethereum.Uniswap-Example/sbom","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":259855660,"owners_count":22922355,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2025-06-14T17:34:17.195Z","updated_at":"2025-06-14T17:34:19.202Z","avatar_url":"https://github.com/Nethereum.png","language":"Solidity","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Nethereum.Uniswap V2, V3, V4, Universal Router and Permit 2\n\nUniswap V2, V3, V4, Universal Router and Permit 2 starter project / example integration with Nethereum.\n\nThis is a reference example, test accordingly.\n\n## V4 Universal Router \n\n# Uniswap V4 Integration with Nethereum\n\n## Setup\n```csharp\nvar url = \"https://base-sepolia.drpc.org\";\nvar privateKey = \"0xYOUR_PRIVATE_KEY\";\nvar web3 = new Web3.Web3(new Account(privateKey), url);\n\nvar poolManager = new PoolManagerService(web3, UniswapAddresses.BaseSepoliaPoolManagerV4);\nvar usdc = \"0x91D1e0b9f6975655A381c79fd6f1D118D1c5b958\";\n\nvar pool = new PoolKey()\n{\n    Currency0 = AddressUtil.ZERO_ADDRESS,\n    Currency1 = usdc,\n    Fee = 500,\n    TickSpacing = 10,\n    Hooks = \"0x24F7c9ea6B5be5227caAeB61366b56052386eae4\"\n};\n```\n\n## Quoting Prices\n\n```csharp\nvar stateViewService = new StateViewService(web3, UniswapAddresses.BaseSepoliaStateViewV4);\nvar v4Quoter = new V4QuoterService(web3, UniswapAddresses.BaseSepoliaQuoterV4);\n\nvar pathKeys = V4PathEncoder.EncodeMultihopExactInPath(new List\u003cPoolKey\u003e { pool }, AddressUtil.ZERO_ADDRESS);\nvar amountIn = Web3.Web3.Convert.ToWei(0.001);\n\nvar quoteExactParams = new QuoteExactParams()\n{\n    Path = pathKeys,\n    ExactAmount = amountIn,\n    ExactCurrency = AddressUtil.ZERO_ADDRESS\n};\n\nvar quote = await v4Quoter.QuoteExactInputQueryAsync(quoteExactParams);\nvar quoteAmount = Web3.Web3.Convert.FromWei(quote.AmountOut, 6); // USDC has 6 decimals\n```\n\n## Executing Swaps with Universal Router\n\n```csharp\nvar universalRouter = new UniversalRouterService(web3, UniswapAddresses.BaseSepoliaUniversalRouterV4);\nvar v4ActionBuilder = new UniversalRouterV4ActionsBuilder();\n\nvar swapExactInSingle = new SwapExactIn()\n{\n    AmountIn = amountIn,\n    AmountOutMinimum = quote.AmountOut,\n    Path = pathKeys.MapToActionV4()\n};\n\nv4ActionBuilder.AddCommand(swapExactInSingle);\n\nvar routerBuilder = new UniversalRouterBuilder();\nrouterBuilder.AddCommand(v4ActionBuilder.GetV4SwapCommand());\n\nvar executeFunction = routerBuilder.GetExecuteFunction(amountIn);\nvar receipt = await universalRouter.ExecuteRequestAndWaitForReceiptAsync(executeFunction);\n```\n\n\n# Uniswap V3 / Permit 2 / V2Quoter\n\n## Setup\n```csharp\nvar url = \"https://ethereum-sepolia.rpc.subquery.network/public\";\nvar privateKey = \"0xYOUR_PRIVATE_KEY\";\nvar account = new Account(privateKey);\nvar web3 = new Nethereum.Web3.Web3(account, url);\n\nvar factoryAddress = UniswapAddresses.SepoliaUniswapV3Factory;\nvar permit2 = UniswapAddresses.SepoliaPermit2;\nvar quoterAddress = UniswapAddresses.SepoliaQuoterV2;\nvar universalRouter = UniswapAddresses.SepoliaUniversalRouterV3;\n\nvar uni = \"0x1f9840a85d5af5bf1d1762f925bdaddc4201f984\";\nvar weth = \"0xfff9976782d46cc05630d1f6ebab18b2324d6b14\";\n```\n\n## Quoting Prices\n### Using Slot0 Price Calculator\n```csharp\nvar calculator = new UniswapV3Slot0PriceCalculator(web3, factoryAddress);\nvar priceWethUni = await calculator.GetPoolPricesAsync(uni, weth, 500);\n```\n\n### Using Quoter V2\n```csharp\nvar quoterService = new QuoterV2Service(web3, quoterAddress);\nvar weth9 = await quoterService.Weth9QueryAsync();\n\nvar amountIn = Web3.Web3.Convert.ToWei(0.001);\nvar abiEncoder = new Nethereum.ABI.ABIEncode();\nvar path = abiEncoder.GetABIEncodedPacked(\n    new ABIValue(\"address\", weth9),\n    new ABIValue(\"uint24\", 500),\n    new ABIValue(\"address\", uni));\n\nvar quote = await quoterService.QuoteExactInputQueryAsync(path, amountIn);\n```\n\n## Executing Swaps with Universal Router\n\n### Prepare ERC20 Approval\n```csharp\nvar weth9Service = web3.Eth.ERC20.GetContractService(weth9);\nawait weth9Service.ApproveRequestAndWaitForReceiptAsync(permit2, IntType.MAX_INT256_VALUE);\n```\n\n### Create and Sign Permit2\n```csharp\nvar permit = new PermitSingle()\n{\n    Spender = universalRouter,\n    SigDeadline = 2000000000,\n    Details = new PermitDetails()\n    {\n        Amount = amountIn * 100000,\n        Expiration = 0,\n        Nonce = 0,\n        Token = weth9\n    }\n};\n\nvar permitService = new Permit2Service(web3, permit2);\nvar signedPermit = await permitService.GetSinglePermitWithSignatureAsync(permit, new EthECKey(privateKey));\n```\n\n### Build and Execute Swap\n```csharp\nvar universalRouterService = new UniversalRouterService(web3, universalRouter);\nvar planner = new UniversalRouterBuilder();\n\nplanner.AddCommand(new WrapEthCommand\n{\n    Amount = amountIn,\n    Recipient = account.Address\n});\n\nplanner.AddCommand(new Permit2PermitCommand\n{\n    Permit = signedPermit.PermitRequest,\n    Signature = signedPermit.GetSignatureBytes()\n});\n\nplanner.AddCommand(new V3SwapExactInCommand\n{\n    AmountIn = amountIn,\n    AmountOutMinimum = quote.AmountOut - 10000, // slippage\n    Path = path,\n    Recipient = account.Address,\n    FundsFromPermit2OrUniversalRouter = true\n});\n\nvar receipt = await universalRouterService.ExecuteRequestAndWaitForReceiptAsync(planner.GetExecuteFunction(amountIn));\n```\n\n### Checking Balances\n```csharp\nvar balanceWethWei = await weth9Service.BalanceOfQueryAsync(account.Address);\nvar balanceInEth = Web3.Web3.Convert.FromWei(balanceWethWei);\n\nvar uniService = web3.Eth.ERC20.GetContractService(uni);\nvar balanceUniWei = await uniService.BalanceOfQueryAsync(account.Address);\nvar balanceInUni = Web3.Web3.Convert.FromWei(balanceUniWei);\n```\n\n### Error Handling\n```csharp\ncatch (SmartContractCustomErrorRevertException e)\n{\n    var error = universalRouterService.FindCustomErrorException(e);\n    if (error != null)\n    {\n        Debug.WriteLine(error.Message);\n        universalRouterService.HandleCustomErrorException(e);\n    }\n    throw;\n}\n```\n\n## Uniswap V2 ERC20 single path and multipath\n\nTo enable hardhat.\n\n1. Go to the directory testchains\\hardhat and run ```npm install```\n2. Configure your fork alchemy api key and block number in your Test settings https://github.com/Nethereum/Nethereum.UniswapV2/blob/main/Nethereum.Uniswap.Testing/appsettings.test.json#L6\n3. When you run your tests it will automatically launch hardhat and fork on the configured block number.\n\n### Code example\n\n```csharp\n        [Fact]\n        public async void ShouldBeAbleToGetThePairForDaiWeth()\n        {\n            var web3 = _ethereumClientIntegrationFixture.GetWeb3();\n            var factoryAddress = \"0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f\";\n            var factoryService = new UniswapV2FactoryService(web3, factoryAddress);\n            var weth = \"0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2\";\n            var dai = \"0x6b175474e89094c44da98b954eedeac495271d0f\";\n            var pair = await factoryService.GetPairQueryAsync(weth, dai);\n            Assert.True(pair.IsTheSameAddress(\"0xa478c2975ab1ea89e8196811f51a7b7ade33eb11\"));\n        }\n\n\n        [Fact]\n        public async Task ShouldBeAbleToSwapEthForDai()\n        {\n            var web3 = _ethereumClientIntegrationFixture.GetWeb3();\n            var myAddress = web3.TransactionManager.Account.Address;\n            var routerV2Address = \"0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D\";\n            var uniswapV2Router02Service = new UniswapV2Router02Service(web3, routerV2Address);\n            var weth = \"0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2\";\n            var dai = \"0x6b175474e89094c44da98b954eedeac495271d0f\";\n            var serviceDAI = new StandardTokenEIP20.StandardTokenService(web3, dai);\n\n            var path = new List\u003cstring\u003e {weth, dai};\n            var amountEth = Web3.Web3.Convert.ToWei(100); //10 Ether\n            \n            var amounts = await uniswapV2Router02Service.GetAmountsOutQueryAsync(amountEth, path);\n            \n            var deadline = DateTimeOffset.Now.AddMinutes(15).ToUnixTimeSeconds();\n            \n            var swapEthForExactTokens = new Contracts.UniswapV2Router02.ContractDefinition.SwapExactETHForTokensFunction()\n            {\n                AmountOutMin = amounts[1],\n                Path = path,\n                Deadline = deadline,\n                To = myAddress,\n                AmountToSend = amountEth\n            };\n           \n            var balanceOriginal = await serviceDAI.BalanceOfQueryAsync(myAddress);\n\n\n            var swapReceipt = await uniswapV2Router02Service.SwapExactETHForTokensRequestAndWaitForReceiptAsync(swapEthForExactTokens);\n            var swapLog = swapReceipt.Logs.DecodeAllEvents\u003cSwapEventDTO\u003e();\n            var transferLog = swapReceipt.Logs.DecodeAllEvents\u003cTransferEventDTO\u003e();\n\n            var balanceNew = await serviceDAI.BalanceOfQueryAsync(myAddress);\n            \n            Assert.Equal(swapLog[0].Event.Amount0Out, balanceNew - balanceOriginal);\n\n        }\n\n        [Fact]\n        public async Task ShouldBeAbleToSwapEthForDaiThenUSDC()\n        {\n            await ShouldBeAbleToSwapEthForDai(); //lets get some DAI\n\n\n            var web3 = _ethereumClientIntegrationFixture.GetWeb3();\n            var myAddress = web3.TransactionManager.Account.Address;\n            var routerV2Address = \"0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D\";\n            var uniswapV2Router02Service = new UniswapV2Router02Service(web3, routerV2Address);\n            var usdc = \"0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48\";\n            var dai = \"0x6b175474e89094c44da98b954eedeac495271d0f\";\n            var serviceDAI = new StandardTokenEIP20.StandardTokenService(web3, dai);\n            var serviceUSDC = new StandardTokenEIP20.StandardTokenService(web3, usdc);\n\n            var path = new List\u003cstring\u003e { dai, usdc };\n            var amountDAI = Web3.Web3.Convert.ToWei(10000);  //DAI 18 dec\n\n            var amounts = await uniswapV2Router02Service.GetAmountsOutQueryAsync(amountDAI, path);\n\n            var deadline = DateTimeOffset.Now.AddMinutes(15).ToUnixTimeSeconds();\n\n            var swapTokensForExactTokens = new Contracts.UniswapV2Router02.ContractDefinition.SwapExactTokensForTokensFunction()\n            {\n                AmountOutMin = amounts[1],\n                Path = path,\n                Deadline = deadline,\n                To = myAddress,\n                AmountIn = amountDAI\n            };\n\n            var balanceOriginal = await serviceUSDC.BalanceOfQueryAsync(myAddress);\n\n            var approveReceipt = await serviceDAI.ApproveRequestAndWaitForReceiptAsync(routerV2Address, amountDAI);\n\n            var swapReceipt = await uniswapV2Router02Service.SwapExactTokensForTokensRequestAndWaitForReceiptAsync(swapTokensForExactTokens);\n            var swapLog = swapReceipt.Logs.DecodeAllEvents\u003cSwapEventDTO\u003e();\n            var transferLog = swapReceipt.Logs.DecodeAllEvents\u003cTransferEventDTO\u003e();\n\n            var balanceNew = await serviceUSDC.BalanceOfQueryAsync(myAddress);\n\n            Assert.Equal(swapLog[0].Event.Amount1Out, balanceNew - balanceOriginal);\n\n        }\n\n    }\n\n```\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnethereum%2Fnethereum.uniswap-example","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fnethereum%2Fnethereum.uniswap-example","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnethereum%2Fnethereum.uniswap-example/lists"}