Top 20 NuGet market Packages

Stock Indicators for .NET. Send in historical price quotes and get back desired technical indicators such as Stochastic RSI, Average True Range, Parabolic SAR, etc. Nothing more.
An SDK for Xignite Webservice APIs
Fynance is a wrapper for stack market data based on .Net Standard. It is current working with Yahoo Finance but new providers can be added in the next versions.
A pure port to .NET Core (C#) of Technical Analysis Library
C# client connects to CoinMarketCap Pro API
Package Description
Intrinio provides real-time stock prices via a two-way WebSocket connection.
Alibaba Cloud SDK for .NET
CrossPlatformLibrary.Market is a plug-in for accessing platform-independent app market functionality.
A portable API library to interact with
moin 商品经营模块
.Net Class Library to easily make use of the IEXCloud API.
Core utility functions for web applications
Widely used by trading software developers requiring to perform technical analysis of financial market data. Includes 200 indicators such as ADX, MACD, RSI, Stochastic, Bollinger Bands etc... Candlestick pattern recognition. Open-source API for C/C++, Java, Perl, Python and 100% Managed .NET
CoinMarketCap Public and Pro API for .Net
A .NET wrapper for Paper Trade's simulated investment portfolio API. Invest in the stock market with fake money.
Provides APIs for accessing Eikon data such as realtime market data and time series. APIs can be consumed from both Eikon Library Apps and standalone applications. (Signed assembly)
.Net SDK to connect Foreks Pubsub Server
Added functionality to extract data from a CBOE option string.