C# (.NET) SDK

Official C# / .NET SDK for the CaptchaSonic CAPTCHA solving API.

Transport

Uses native gRPC via Grpc.Net.Client. Images are sent as raw binary, with no base64 overhead.

Installation

dotnet add package CaptchaSonic

Quick Start

using CaptchaSonic;

await using var client = new CaptchaSonicClient(new CaptchaSonicOptions
{
    ApiKey = "sonic_your_api_key"
});

double balance = await client.GetBalanceAsync();
Console.WriteLine($"Balance: ${balance:F4}");

byte[] tile = await File.ReadAllBytesAsync("tile.png");
var result = await client.SolvePopularCaptchaAsync(
    images: new[] { tile },
    question: "Select all traffic lights",
    questionType: "objectClassify"
);
Console.WriteLine(string.Join(", ", result.TypedSolution.Grid.Objects));

Simple constructor

await using var client = new CaptchaSonicClient("sonic_your_api_key");

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Configuration

var client = new CaptchaSonicClient(new CaptchaSonicOptions
{
    ApiKey      = "sonic_your_api_key",          // required, must start with "sonic_"
    Endpoint    = "https://api.captchasonic.com", // optional, default shown
    CallTimeout = TimeSpan.FromSeconds(30),       // optional, per-call gRPC deadline
});

The client is thread-safe — create one instance and reuse it throughout your application.

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Image Solvers

SolvePopularCaptchaAsync()

await client.SolvePopularCaptchaAsync(
    images: new[] { tile },
    question: "Select all traffic lights",
    questionType: "objectClassify",   // "objectClassify" | "objectClick" | "objectDrag" | "grid"
    examples: null,                   // optional reference images
    screenshot: false,                // optional
    websiteUrl: "https://example.com", // optional, billing context
    websiteKey: null                  // optional, billing context
);

SolveRecaptchaV2Async()

await client.SolveRecaptchaV2Async(
    images: new[] { tile },
    question: "traffic lights",       // or "/m/015qff"
    questionType: "split_33",         // "split_33" | "33" | "44". Optional.
    websiteUrl: null,                 // optional
    websiteKey: null                  // optional
);

SolveGeetestAsync()

await client.SolveGeetestAsync(
    geetestType: "nine",              // "nine" | "click" | "slide" | "match" | "winlinze"
    question: "the bear",             // required for "nine" and "click"
    images: new[] { tile },           // required for "nine", "click", "slide"
    examples: null,                   // optional reference images
    image: null,                      // slice piece for "slide"
    gtv: 3,                           // Geetest version, default 3
    websiteUrl: null                  // optional
);

SolveOcrAsync()

await client.SolveOcrAsync(
    images: new[] { tile },
    module: "common",                 // "common" | "mtcaptcha" | "bls" | "morocco"
    websiteUrl: null                  // optional
);
// Returns: result.TypedSolution.Text.Texts[0]

SolveTikTokAsync()

await client.SolveTikTokAsync(
    type: "whirl",                    // "click" | "whirl" | "slide"
    question: "",                     // optional
    images: new[] { tile },
    examples: null,                   // required for "whirl" and "slide"
    websiteUrl: null                  // optional
);

SolveBinanceAsync()

await client.SolveBinanceAsync(
    type: "grid",                     // "grid" | "slide"
    question: "Select the bicycle",   // required for "grid"
    images: new[] { tile },
    examples: null,                   // optional
    websiteUrl: null                  // optional
);

SolveAwsWafAsync()

await client.SolveAwsWafAsync(
    images: new[] { tile },
    question: "grid:vehicles:cars",
    websiteUrl: null,                 // optional
    websiteKey: null                  // optional
);

SolveSlideImageAsync()

await client.SolveSlideImageAsync(images: new[] { background, piece });
// Returns: result.TypedSolution.Slide.X — pixel offset

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Token Automation Methods

These submit a task and poll until a token is returned (up to 120s).

await client.SolveTurnstileAsync(websiteUrl, websiteKey, proxy?);
await client.SolvePopularCaptchaTokenAsync(websiteUrl, websiteKey, proxy?);
await client.SolveRecaptchaV2TokenAsync(websiteUrl, websiteKey, proxy?);
await client.SolveRecaptchaV3TokenAsync(websiteUrl, websiteKey, proxy?);
await client.SolveCloudflareAsync(websiteUrl, websiteKey, proxy);  // proxy required

---

Utility Methods

double balance = await client.GetBalanceAsync();
var health     = await client.HealthCheckAsync();
var result     = await client.GetTaskResultAsync(taskId);
var response   = await client.CreateTaskAsync(task);

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Error Handling

try
{
    var result = await client.SolvePopularCaptchaAsync(images, question, questionType);
}
catch (InvalidApiKeyException)         { /* errorId=1 */ }
catch (InsufficientBalanceException)   { /* errorId=2 */ }
catch (DailyLimitExceededException)    { /* errorId=3 */ }
catch (MinuteLimitExceededException)   { /* errorId=4 */ }
catch (QuotaExceededException)         { /* errorId=5 */ }
catch (PlanExpiredException)           { /* errorId=6 */ }
catch (CaptchaSonicException)          { /* other errors */ }

Retries automatically on Unavailable, ResourceExhausted, DeadlineExceeded with exponential backoff.

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