Whatsapp API send message С#

How to Send a Message by WhatsApp API using C Sharp

We’ll be using the RestSharp library, a simple REST and HTTP API Client for .NET, to interact with the Whapi.Cloud API.


The first step is to register on the Whapi.Cloud website and create an account. It's free and doesn't require you to enter a credit card.

After registration you will immediately have access to a test channel with a small limitation. Wait for it to start (it usually takes about a minute). You will need to connect your phone for Whatsapp automation. It is from the connected phone that messages will be sent.

Open your WhatsApp mobile app, navigate to Settings -> Linked devices -> Link a device -> Scan QR code

Our service enables you to interact with the API without the need for an uninterrupted phone connection. Operate WhatsApp on up to four paired devices and one mobile device concurrently.

Now save the generated API-Key token on channel page:

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How to Send WhatsApp API Message using C Sharp

Before diving into the code, you’ll need to set up your development environment. Install the RestSharp package via NuGet Package Manager Console:

Install-Package RestSharp

We offer a convenient service for testing requests and using ready-made code fragments in any programming language. You will only need to transfer the saved API-token and fill in the required parameters:

Here’s a concise snippet demonstrating how to send a WhatsApp message using C# and the WhatsApp API:

using RestSharp;

var options = new RestClientOptions("https://gate.whapi.cloud/messages/text?token=YOUR_TOKEN");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddHeader("accept", "application/json");
request.AddJsonBody("{\"typing_time\":0,\"to\":\"1234567891@s.whatsapp.net\",\"body\":\"Hello, World!\"}", false);
var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content);
  • 'to': The recipient’s WhatsApp number with international format e.g., 14409416972 or chatID for contact or group e.g 14409416972@s.whatsapp.net or 125001234567890@g.us

  • 'body' : Message text.

Please note that this is a basic example and doesn't include any error handling. For a production environment, ensure to add appropriate error and exception handling.

Make sure to explore the Whapi.Cloud API documentation for more features and possibilities

Moreover, you can interact dynamically with emoji messages by quoting, marking them as read, or simulating real-time typing.

Furthermore, you can efficiently manage your groups by changing avatars, renaming them, inviting new members, or blocking unwanted users.

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Please don't hesitate to reach out to share your experiences or pose any questions you might have.

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Send Document

Send Audio

Send Voice

You can Send a ppt audio recording to the phone number or group, But WhatsApp is sensitive to this extension, you need to be in OGG format and the codecs should be the opus. Our API has an automatic video and audio converter for the necessary codecs compatible with WhatsApp. For more information, you can check out this article.

Send Video

Send GIF

Send Contact

Send Contact List

Send Location

Send Sticker

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