Ищите решение для Angular-Dart, которое позволило бы получать данные API json из http или websocket.https://iextrading.com/developer/docs/#websocket, https://iextrading.com/developer/docs/#http-methods или https://www.alphavantage.co/documentation/ Новичок в Dart Web;)
import 'package:http/http.dart' as http; import 'dart:async'; const socket = require('socket.io-client')('https://ws-api.iextrading.com /1.0/tops') class StockService { Future<double> getPrice(String symbol) async { String url = "https://api.iextrading.com/1.0/stock/${symbol}/price"; http.Response response = await http.get(url); test('Intraday', () async { final timeSeries = new TimeSeries("YourAlphaVantageAPIKey"); JSONObject json = await timeSeries.getIntraday("MSFT"); // Use get method to search entire json for key for stock expect(json.get("2. Symbol"), "MSFT"); <table> <tr ngFor="let price of prices"> <td>{{ quotes.symbol }}</td> <td>{{ quotes.price }}</td> </tr>