C# / .NET Client

Modern .NET C# client for Gender-API.com supporting both .NET Core and Framework with full async/await capabilities. Our specialized API provides 99.5% accurate gender detection with sub-100ms response times, outperforming generic AI by 9-34% in accuracy and 10x-90x in speed. Perfect for ASP.NET applications, Azure Functions, and enterprise systems. The client library follows .NET best practices with proper exception handling and dependency injection support. Access over 9 million names across 150+ countries with intelligent fallback and smart normalization. Ideal for CRM, marketing automation, and user management systems. Start free with 100 API calls monthly. Trusted by Fortune 500 companies.

First install our library with composer:

See full client documentation here:

https://github.com/markus-perl/gender-api-client

First install our library with npm:

See full client documentation here:

https://github.com/markus-perl/gender-api-client-npm

First install our library with npm:

See full client documentation here:

https://github.com/markus-perl/gender-api-client-npm

First install our library with pip:

See full client documentation here:

https://github.com/markus-perl/gender-api-client-python
https://pypi.org/project/gender-api-client/ 

using System;
using System.Net.Http;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Threading.Tasks;

public record GenderResponse(
    [property: JsonPropertyName("first_name")] string FirstName,
    [property: JsonPropertyName("gender")] string Gender,
    [property: JsonPropertyName("probability")] double Probability
);

public class Program
{
    public static async Task Main()
    {
        var apiKey = "YOUR_API_KEY"; // Get your key at https://gender-api.com/en/account/auth-tokens
        using var client = new HttpClient();

        var requestBody = new { first_name = "Theresa" };
        var jsonContent = new StringContent(
            JsonSerializer.Serialize(requestBody), 
            Encoding.UTF8, 
            "application/json");

        // Add Authorization header
        client.DefaultRequestHeaders.Add("Authorization", $"Bearer {apiKey}");

        try 
        {
            // Send POST request to API V2
            var response = await client.PostAsync("https://gender-api.com/v2/gender/by-first-name", jsonContent);
            response.EnsureSuccessStatusCode();

            // Parse response
            var jsonResponse = await response.Content.ReadAsStringAsync();
            var result = JsonSerializer.Deserialize<GenderResponse>(jsonResponse);

            Console.WriteLine($"Gender: {result.Gender}");
            Console.WriteLine($"Probability: {result.Probability}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error: {ex.Message}");
        }
    }
}

Professional Gender Detection for Your Applications

Gender-API.com delivers enterprise-grade gender detection with 99.5% accuracy across 150+ countries. Our specialized API outperforms generic AI solutions with 10x-90x faster response times and 9-34% better accuracy.

Why Choose Gender-API Over Generic AI?

  • Purpose-Built : Specialized for gender detection, not a general-purpose AI
  • Lightning Fast : Sub-100ms response times vs. seconds for generic AI
  • More Accurate : 99.5% accuracy with cultural and regional intelligence
  • Larger Database : 9+ million names, 37% more than typical AI training data
  • Reliable : 99.9% uptime SLA with predictable performance

Key Features

  • Easy integration with just a few lines of code
  • Batch processing for high-volume applications
  • Country-specific accuracy for regional name variations
  • Smart normalization handling typos and variants
  • GDPR compliant and enterprise-ready

Start Free Today

Get 100 free API calls per month with no credit card required. Scale as you grow with flexible pricing for every use case.

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