SteamApis.Net

Unofficial https://steamapis.com .NET library, targeting .NET 8.0

dotnet add package SteamApis.Net

Getting started

Dependency Injection (ASP.NET Core or Generic Host)

using SteamApis.Net.Extensions;

builder.Services.AddSteamApis("your-steamapis-key");

You can optionally customize the underlying HttpClient:

builder.Services.AddSteamApis("your-steamapis-key", client =>
{
    client.Timeout = TimeSpan.FromSeconds(30);
});

Then inject ISteamApisClient anywhere:

public class MyService(ISteamApisClient steamApis)
{
    public async Task DoWorkAsync()
    {
        var inventory = await steamApis.Steam.Users.GetInventoryAsync("7656119...", 730, 2);
    }
}

Standalone (no DI)

using SteamApis.Net.Services;

var client = SteamApisClientFactory.Create("your-steamapis-key");

var inventory = await client.Steam.Users.GetInventoryAsync("7656119...", 730, 2);

Client structure

ISteamApisClient exposes two API groups:

Property	Base URL	Description
Steam	https://api.steamapis.com	Steam API v2 endpoints
MarketPlace	https://marketplaceapi.steamapis.com	Third-party Marketplace Data API v2

Error handling

Every method returns an ApiResult<T> — no exceptions are thrown for API-level failures:

var result = await client.Steam.Apps.GetDetailsAsync(730);

if (result.IsSuccess)
{
    Console.WriteLine(result.Value.Name);
}
else
{
    Console.WriteLine($"{result.Error.StatusCode}: {result.Error.Message}");
}

ApiResult<T> also provides helpers like TryGetValue, GetValueOrDefault, Map, OnSuccess, and OnFailure:

var playerCount = (await client.Steam.Apps.GetPlayerCountsAsync())
    .OnFailure(error => logger.LogWarning("Request failed: {Code}", error.Code));