array(18) {
  [0] => string(7) "btcusdt"
  [1] => string(7) "ethusdt"
  [2] => string(7) "bsvusdt"
  [3] => string(7) "xrpusdt"
  [4] => string(7) "ltcusdt"
  [5] => string(7) "etcusdt"
  [6] => string(7) "dotusdt"
  [7] => string(8) "shibusdt"
  [8] => string(7) "filusdt"
  [9] => string(8) "dogeusdt"
  [10] => string(8) "linkusdt"
  [11] => string(7) "bchusdt"
  [12] => string(7) "adausdt"
  [13] => string(7) "trxusdt"
  [14] => string(7) "xmrusdt"
  [15] => string(8) "iotausdt"
  [16] => string(8) "dashusdt"
  [17] => string(7) "zecusdt"
}

array(18) {
  [0] => string(7) "btcusdt"
  [1] => string(7) "ethusdt"
  [2] => string(7) "xrpusdt"
  [3] => string(7) "ltcusdt"
  [4] => string(7) "etcusdt"
  [5] => string(7) "dotusdt"
  [6] => string(8) "shibusdt"
  [7] => string(7) "filusdt"
  [8] => string(8) "dogeusdt"
  [9] => string(8) "linkusdt"
  [10] => string(7) "bchusdt"
  [11] => string(7) "bsvusdt"
  [12] => string(7) "adausdt"
  [13] => string(7) "trxusdt"
  [14] => string(7) "xmrusdt"
  [15] => string(8) "iotausdt"
  [16] => string(8) "dashusdt"
  [17] => string(7) "zecusdt"
}