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How to use the Yes No API in C#

Generate yes or no randomly. This guide calls it from C# with code we've run against the live endpoint.

Online · 923 msEndpoint tested Oct 24, 2026

1. What you need

.NET 6 or newer. Paste into a top-level `Program.cs` and run `dotnet run`.

No API key or sign-up. Endpoint: https://yesno.wtf/api

2. Make the request

C#
using System.Net.Http;

using var http = new HttpClient { Timeout = TimeSpan.FromSeconds(10) };
var json = await http.GetStringAsync("https://yesno.wtf/api");
Console.WriteLine(json);

3. The response

Trimmed from the live response on Oct 24, 2026.

JSON
{
  "answer": "yes",
  "forced": false,
  "image": "https://yesno.wtf/assets/yes/13-c3082a998e7758be8e582276f35d1336.gif"
}

4. Before you ship

  • Set a timeout and handle non-200 responses: free APIs can rate-limit or go down.
  • Cache responses where you can, instead of calling the API on every page view.
  • Read the official documentation ↗ for rate limits and terms of use.

FAQ

Does the Yes No API need an API key in C#?

No. The Yes No API works without an API key, so the C# example runs as-is.

Can I call the Yes No API from the browser?

Yes. It sends CORS headers, so front-end JavaScript can call it directly.

What does the Yes No API return?

JSON. The example response on this page is trimmed from a real response our health check received on Oct 24, 2026.

Same API in: Python · JavaScript · Node.js · PHP · Java · Go · Ruby
Yes No API: ratings & reviews · Yes No API alternatives · more free APIs for C#