Semantic Kernel

export TOKENLAB_API_KEY="sk-your-tokenlab-key"

using Microsoft.SemanticKernel;

#pragma warning disable SKEXP0010

var builder = Kernel.CreateBuilder();

builder.AddOpenAIChatCompletion(
    modelId: "gpt-5.4-mini",
    endpoint: new Uri("https://api.tokenlab.sh/v1"),
    apiKey: Environment.GetEnvironmentVariable("TOKENLAB_API_KEY"));

var kernel = builder.Build();

var result = await kernel.InvokePromptAsync(
    "Give me a concise checklist for evaluating an LLM gateway.");

Console.WriteLine(result);

https://api.tokenlab.sh/v1

https://api.tokenlab.sh/v1/chat/completions