This is a stock indicator library that is completely open source and very easy to use. Current version contains 762 stock indicators and I will add more as I get requests for them!
Here is an example to show how easy it is to create indicators using other indicators
var stockData = new StockData(openPrices, highPrices, lowPrices, closePrices, volumes);
var results = stockData.CalculateRelativeStrengthIndex().CalculateMovingAverageConvergenceDivergence();
Here is an example to get you started using the Alpaca C# Api
using Alpaca.Markets;
using OoplesFinance.StockIndicators.Models;
using static OoplesFinance.StockIndicators.Calculations;
const string paperApiKey = "REPLACEME";
const string paperApiSecret = "REPLACEME";
const string symbol = "AAPL";
var startDate = new DateTime(2021, 01, 01);
var endDate = new DateTime(2021, 12, 31);
var client = Environments.Paper.GetAlpacaDataClient(new SecretKey(paperApiKey, paperApiSecret));
var bars = (await client.ListHistoricalBarsAsync(new HistoricalBarsRequest(symbol, startDate, endDate, BarTimeFrame.Day)).ConfigureAwait(false)).Items;
var stockData = new StockData(bars.Select(x => x.Open), bars.Select(x => x.High), bars.Select(x => x.Low), bars.Select(x => x.Close), bars.Select(x => x.Volume), bars.Select(x => x.TimeUtc));
var results = stockData.CalculateBollingerBands();
var upperBandList = results.OutputValues["UpperBand"];
var middleBandList = results.OutputValues["MiddleBand"];
var lowerBandList = results.OutputValues["LowerBand"];
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