TW-1194 Replace TZPRO API with Binance API

.env.dist

@@ -10,4 +10,3 @@ THREE_ROUTE_API_AUTH_TOKEN=
 REDIS_URL=
 ADD_NOTIFICATION_USERNAME=
 ADD_NOTIFICATION_PASSWORD=
-TZPRO_API_KEY=

src/config.ts

@@ -12,8 +12,7 @@ export const EnvVars = {
   THREE_ROUTE_API_AUTH_TOKEN: getEnv('THREE_ROUTE_API_AUTH_TOKEN'),
   REDIS_URL: getEnv('REDIS_URL'),
   ADD_NOTIFICATION_USERNAME: getEnv('ADD_NOTIFICATION_USERNAME'),
-  ADD_NOTIFICATION_PASSWORD: getEnv('ADD_NOTIFICATION_PASSWORD'),
-  TZPRO_API_KEY: getEnv('TZPRO_API_KEY')
+  ADD_NOTIFICATION_PASSWORD: getEnv('ADD_NOTIFICATION_PASSWORD')
 };
 
 for (const name in EnvVars) {

src/interfaces/ticker.interface.ts

@@ -1,16 +1,4 @@
 export interface ITicker {
-  pair: string;
-  base: string;
-  quote: string;
-  exchange: string;
-  open: number;
-  high: number;
-  low: number;
-  last: number;
-  change: number;
-  vwap: number;
-  n_trades: number;
-  volume_base: number;
-  volume_quote: number;
-  timestamp: string;
+  symbol: string;
+  price: string;
 }

src/utils/tezos.ts

@@ -3,7 +3,6 @@ import { tzip12 } from '@taquito/tzip12';
 import { tzip16 } from '@taquito/tzip16';
 import memoizee from 'memoizee';
 
-import { EnvVars } from '../config';
 import { ITicker } from '../interfaces/ticker.interface';
 import fetch from './fetch';
 import SingleQueryDataProvider from './SingleQueryDataProvider';
@@ -54,18 +53,12 @@ export const getStorage = memoizee(
 );
 
 const getTezExchangeRate = async () => {
-  const marketTickers = await fetch<Array<ITicker>>(
-    `https://api.tzpro.io/markets/tickers?api_key=${EnvVars.TZPRO_API_KEY}`
-  );
-  const usdTickers = marketTickers.filter(e => e.quote === 'USD' && e.base === 'XTZ');
-  // price index: use all USD ticker last prices with equal weight
-  const vol = usdTickers.reduce((s, t) => s + t.volume_base, 0) || null;
-  const price = vol === null ? 1 : usdTickers.reduce((s, t) => s + (t.last * t.volume_base) / vol, 0);
-
-  return price;
+  const { price: rawPrice } = await fetch<ITicker>('https://api.binance.com/api/v3/ticker/price?symbol=XTZUSDT');
+
+  return Number(rawPrice);
 };
 
-export const tezExchangeRateProvider = new SingleQueryDataProvider(30000, getTezExchangeRate);
+export const tezExchangeRateProvider = new SingleQueryDataProvider(60000, getTezExchangeRate);
 
 export class MetadataParseError extends Error {}