IQFeed.CSharpApiClient is fastest and the most well designed C# DTN IQFeed socket API connector available to the open source community! Currently supporting the latest stable IQFeed protocol version 6.1.

IQFeed is an affordable and reputable Internet market data provider. For more info.
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• Features
• Usage
  • Packages
  • Installation
  • Configuration
    • User environment variables
    • app.config
  • Examples
  • IQFeed API support status
    • Streaming data
    • Lookup data
• Support
• Sponsors
• Contributing

• Designed completely non-blocking from bottom-up with nice async/await interfaces
• Streaming events are distributed in a consistent way using Action delegates
• Handle multiple socket connections for at least 50% performance increase when requesting lookup data
• Sockets are using SocketAsyncEventArgs for maximum performance and trying to reduce pressure on GC
• Support for .NET Core
• No 3rd party dependency
• Python support 🆕

MyGet Pre-release feed: https://www.myget.org/gallery/iqfeedcsharpapiclient

Package	NuGet Stable	MyGet Pre-release	Downloads
IQFeed.CSharpApiClient
IQFeed.CSharpApiClient.Extensions

Install-Package IQFeed.CSharpApiClient

Now, you need to set your API credentials and product id somewhere. You have 2 options, in your user environment variables or app.config.

• Run rundll32 sysdm.cpl,EditEnvironmentVariables to open the Environment Variables
• In your User variables, create 4 new ones:
  • IQCONNECT_LOGIN
  • IQCONNECT_PASSWORD
  • IQCONNECT_PRODUCT_ID
  • IQCONNECT_PRODUCT_VERSION (not mandatory, will fallback to 1.0.0.0)

In your appSettings section, assign values to these key:

<appSettings>
     <add key="IQConnect:login" value=""/>
     <add key="IQConnect:password" value=""/>
     <add key="IQConnect:product_id" value=""/>
     <add key="IQConnect:product_version" value=""/>
</appSettings>

Check IQFeed.CSharpApiClient.Examples for more examples.

IQFeedLauncher.Start();
var lookupClient = LookupClientFactory.CreateNew();
lookupClient.Connect();
var tickMessages = await lookupClient.Historical.GetHistoryTickDatapointsAsync("AAPL", 100);

• Level 1 data
• Level 2 data
• Derivative data
• Admin data

• Historical data
• News data 🆕
• Symbol Lookup data
• Chains Lookup data
• Market Summary Data (new in protocol 6.1)

For support request, you can create an issue on GitHub or join our Gitter chat.

Pull requests are welcome! Don't hesitate to open an issue if something goes wrong.