fix

api/controllers/TickerController.php

@@ -182,6 +182,10 @@ class TickerController extends BaseController
                 if ('BCH' == strtoupper($tag_first)) {
                     $tag_first = 'BCC';
                 }
+
+                if ('USAT' == strtoupper($tag_second)) {
+                    $tag_second = 'USDT';
+                }
                 $exchange = ExchangeFactory::createExchange($exchange);
                 $quotation = $exchange->getTicker(strtolower($tag_first), strtolower($tag_second));
                 if (empty($quotation)) continue;