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Multi-LLM Router API in C#

Complete C# integration guide for the Multi-LLM Router API. Copy the code below, add your RapidAPI key, and start building.

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Prerequisites

1.Sign up for a free account on RapidAPI
2.Subscribe to the Multi-LLM Router API (free tier available)
3.Copy your X-RapidAPI-Key from the dashboard
4.Install the dependency: dotnet add package System.Net.Http.Json

Complete C# Example

helix-multi-llm-router.cs

using System.Net.Http.Json;
using System.Text;
using System.Text.Json;

var url = "https://multi-llm-router-by-helix-api.p.rapidapi.com/chat";
var payload = """
    {"model": "llama-3.3-70b", "messages": [{"role": "user", "content": "Explain APIs in one sentence."}]}
    """;

using var client = new HttpClient();
client.DefaultRequestHeaders.Add("X-RapidAPI-Key", "YOUR_API_KEY");
client.DefaultRequestHeaders.Add("X-RapidAPI-Host", "multi-llm-router-by-helix-api.p.rapidapi.com");

var content = new StringContent(payload, Encoding.UTF8, "application/json");
var response = await client.PostAsync(url, content);
var json = await response.Content.ReadAsStringAsync();

Console.WriteLine($"Status: {response.StatusCode}");
Console.WriteLine($"Body: {json}");

Response Format

All Helix-API endpoints return a consistent JSON envelope:

{
  "status": "ok",
  "data": { ... },
  "meta": {
    "request_id": "req_abc123",
    "latency_ms": 42
  }
}

On errors, status becomes "error" and a message field explains what went wrong.

Error Handling

Status	Meaning	Action
`200`	Success	Parse the response body normally
`400`	Bad request	Check your request parameters
`401`	Unauthorized	Verify your X-RapidAPI-Key header
`429`	Rate limited	Wait and retry with exponential backoff
`500`	Server error	Retry after a short delay