Add project files.

OemanTrader.FinantialModelingPrepAPI/FinancialModelingPrepHttpClient.cs

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+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Net.Http;
+
+namespace OemanTrader.FinantialModelingPrepAPI
+{
+    public class FinancialModelingPrepHttpClient : HttpClient
+    {
+        private readonly string _apiKey;
+
+        public FinancialModelingPrepHttpClient(string apiKey)
+        {
+            this.BaseAddress = new Uri("https://financialmodelingprep.com/api/v3/");
+            _apiKey = apiKey;
+        }
+
+        public async Task<T> GetAsync<T>(string uri)
+        {
+            //            HttpResponseMessage response = await GetAsync(uri + "?apikey=2035d4934632e1d7c38f15982e39d3aa");
+            //var apikey = "2035d4934632e1d7c38f15982e39d3aa";
+            HttpResponseMessage response = await GetAsync($"{uri}?apikey={_apiKey}");
+            string jsonResponse = await response.Content.ReadAsStringAsync();
+
+            return JsonConvert.DeserializeObject<T>(jsonResponse);
+        }
+    }
+}

OemanTrader.FinantialModelingPrepAPI/FinancialModelingPrepHttpClientFactory.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.FinantialModelingPrepAPI
+{
+    public class FinancialModelingPrepHttpClientFactory
+    {
+        private readonly string _apiKey;
+
+        public FinancialModelingPrepHttpClientFactory(string apiKey)
+        {
+            _apiKey = apiKey;
+        }
+        
+        public FinancialModelingPrepHttpClient CreateHttpClient()
+        {
+            return new FinancialModelingPrepHttpClient(_apiKey);
+        }
+    }
+}

OemanTrader.FinantialModelingPrepAPI/OemanTrader.FinantialModelingPrepAPI.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\OemanTrader.Domain\OemanTrader.Domain.csproj" />
+  </ItemGroup>
+
+</Project>

OemanTrader.FinantialModelingPrepAPI/Results/StockPriceResult.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.FinantialModelingPrepAPI.Results
+{
+    public class StockPriceResult
+    {
+        public double Price { get; set; }
+    }
+}

OemanTrader.FinantialModelingPrepAPI/Services/MajorIndexService.cs

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+using Newtonsoft.Json;
+using OemanTrader.Domain.Models;
+using OemanTrader.Domain.Services;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.FinantialModelingPrepAPI.Services
+{
+    public class MajorIndexService : IMajorIndexService
+    {
+        private readonly FinancialModelingPrepHttpClientFactory _httpClientFactory;
+
+        public MajorIndexService(FinancialModelingPrepHttpClientFactory httpClientFactory)
+        {
+            _httpClientFactory = httpClientFactory;
+        }
+
+        public async Task<MajorIndex> GetMajorIndex(MajorIndexType indexType)
+        {
+            using (FinancialModelingPrepHttpClient client = _httpClientFactory.CreateHttpClient())
+            {
+                string uri = "majors-indexes/" + GetUriSuffix(indexType);
+
+                //HttpResponseMessage response = await client.GetAsync(uri + "?apikey=2035d4934632e1d7c38f15982e39d3aa");
+                MajorIndex majorIndex = await client.GetAsync<MajorIndex>(uri);
+                majorIndex.Type = indexType;
+                
+                return majorIndex;
+            }
+        }
+
+        private string GetUriSuffix(MajorIndexType indexType)
+        {
+            switch (indexType)
+            {
+                case MajorIndexType.DowJones:
+                    return ".DJI";
+                case MajorIndexType.Nasdaq:
+                    return ".IXIC";
+                case MajorIndexType.SP500:
+                    return ".INX";
+                default:
+                    throw new Exception("MajorIndexType does not have a suffix defined.");
+            }
+        }
+    }
+}

OemanTrader.FinantialModelingPrepAPI/Services/StockPriceService.cs

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+using OemanTrader.Domain.Exceptions;
+using OemanTrader.Domain.Services;
+using OemanTrader.FinantialModelingPrepAPI.Results;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OemanTrader.FinantialModelingPrepAPI.Services
+{
+    public class StockPriceService : IStockPriceService
+    {
+        private readonly FinancialModelingPrepHttpClientFactory _httpClientFactory;
+
+        public StockPriceService(FinancialModelingPrepHttpClientFactory httpClientFactory)
+        {
+            _httpClientFactory = httpClientFactory;
+        }
+        public async Task<double> GetPrice(string symbol)
+        {
+            using (FinancialModelingPrepHttpClient client = _httpClientFactory.CreateHttpClient())
+            {
+                string uri = "stock/real-time-price/" + symbol;
+
+                //HttpResponseMessage response = await client.GetAsync(uri + "?apikey=2035d4934632e1d7c38f15982e39d3aa");
+                StockPriceResult stockPriceResult = await client.GetAsync<StockPriceResult>(uri);
+
+                if (stockPriceResult.Price == 0)
+                {
+                    throw new InvalidSymbolException(symbol);
+                }
+
+                return stockPriceResult.Price;
+            }
+        }
+    }
+}