text: 'use strict';
  
  //  ---------------------------------------------------------------------------
  
  const Exchange = require ('./base/Exchange');
  const { BadSymbol, ExchangeError, ExchangeNotAvailable, AuthenticationError, InvalidOrder, InsufficientFunds, OrderNotFound, DDoSProtection, PermissionDenied, AddressPending, OnMaintenance, BadRequest, InvalidAddress } = require ('./base/errors');
  const { TRUNCATE, DECIMAL_PLACES } = require ('./base/functions/number');
  
  //  ---------------------------------------------------------------------------
  
  module.exports = class bittrex extends Exchange {
      describe () {
          return this.deepExtend (super.describe (), {
              'id': 'bittrex',
              'name': 'Bittrex',
              'countries': [ 'US' ],
              'version': 'v3',
              'rateLimit': 1500,
              'certified': true,
              'pro': true,
              // new metainfo interface
              'has': {
                  'CORS': false,
                  'cancelAllOrders': true,
                  'cancelOrder': true,
                  'createDepositAddress': true,
                  'createMarketOrder': true,
                  'createOrder': true,
                  'fetchBalance': true,
                  'fetchDeposits': true,
                  'fetchDepositAddress': true,
                  'fetchClosedOrders': true,
                  'fetchCurrencies': true,
                  'fetchMarkets': true,
                  'fetchMyTrades': 'emulated',
                  'fetchOHLCV': true,
                  'fetchOrder': true,
                  'fetchOrderTrades': true,
                  'fetchOrderBook': true,
                  'fetchOpenOrders': true,
                  'fetchTicker': true,
                  'fetchTickers': true,
                  'fetchTime': true,
                  'fetchTrades': true,
                  'fetchTransactions': false,
                  'fetchWithdrawals': true,
                  'withdraw': true,
              },
              'timeframes': {
                  '1m': 'MINUTE_1',
                  '5m': 'MINUTE_5',
                  '1h': 'HOUR_1',
                  '1d': 'DAY_1',
              },
              'hostname': 'bittrex.com',
              'urls': {
                  'logo': 'https://user-images.githubusercontent.com/51840849/87153921-edf53180-c2c0-11ea-96b9-f2a9a95a455b.jpg',
                  'api': {
                      'public': 'https://api.bittrex.com',
                      'private': 'https://api.bittrex.com',
                  },
                  'www': 'https://bittrex.com',
                  'doc': [
                      'https://bittrex.github.io/api/v3',
                  ],
                  'fees': [
                      'https://bittrex.zendesk.com/hc/en-us/articles/115003684371-BITTREX-SERVICE-FEES-AND-WITHDRAWAL-LIMITATIONS',
                      'https://bittrex.zendesk.com/hc/en-us/articles/115000199651-What-fees-does-Bittrex-charge-',
                  ],
                  'referral': 'https://bittrex.com/Account/Register?referralCode=1ZE-G0G-M3B',
              },
              'api': {
                  'public': {
                      'get': [
                          'ping',
                          'currencies',
                          'currencies/{symbol}',
                          'markets',
                          'markets/tickers',
                          'markets/summaries',
                          'markets/{marketSymbol}',
                          'markets/{marketSymbol}/summary',
                          'markets/{marketSymbol}/orderbook',
                          'markets/{marketSymbol}/trades',
                          'markets/{marketSymbol}/ticker',
                          'markets/{marketSymbol}/candles/{candleInterval}/recent',
                          'markets/{marketSymbol}/candles/{candleInterval}/historical/{year}/{month}/{day}',
                          'markets/{marketSymbol}/candles/{candleInterval}/historical/{year}/{month}',
                          'markets/{marketSymbol}/candles/{candleInterval}/historical/{year}',
                      ],
                  },
                  'private': {
                      'get': [
                          'account',
                          'account/volume',
                          'addresses',
                          'addresses/{currencySymbol}',
                          'balances',
                          'balances/{currencySymbol}',
                          'deposits/open',
                          'deposits/closed',
                          'deposits/ByTxId/{txId}',
                          'deposits/{depositId}',
                          'orders/closed',
                          'orders/open',
                          'orders/{orderId}',
                          'orders/{orderId}/executions',
                          'ping',
                          'subaccounts/{subaccountId}',
                          'subaccounts',
                          'withdrawals/open',
                          'withdrawals/closed',
                          'withdrawals/ByTxId/{txId}',
                          'withdrawals/{withdrawalId}',
                          'withdrawals/whitelistAddresses',
                          'conditional-orders/{conditionalOrderId}',
                          'conditional-orders/closed',
                          'conditional-orders/open',
                          'transfers/sent',
                          'transfers/received',
                          'transfers/{transferId}',
                      ],
                      'post': [
                          'addresses',
                          'orders',
                          'subaccounts',
                          'withdrawals',
                          'conditional-orders',
                          'transfers',
                      ],
                      'delete': [
                          'orders/open',
                          'orders/{orderId}',
                          'withdrawals/{withdrawalId}',
                          'conditional-orders/{conditionalOrderId}',
                      ],
                  },
              },
              'fees': {
                  'trading': {
                      'tierBased': true,
                      'percentage': true,
                      'maker': 0.0035,
                      'taker': 0.0035,
                  },
                  'funding': {
                      'tierBased': false,
                      'percentage': false,
                  },
              },
              'exceptions': {
                  'exact': {
                      'BAD_REQUEST': BadRequest, // {"code":"BAD_REQUEST","detail":"Refer to the data field for specific field validation failures.","data":{"invalidRequestParameter":"day"}}
                      'STARTDATE_OUT_OF_RANGE': BadRequest, // {"code":"STARTDATE_OUT_OF_RANGE"}
                      // 'Call to Cancel was throttled. Try again in 60 seconds.': DDoSProtection,
                      // 'Call to GetBalances was throttled. Try again in 60 seconds.': DDoSProtection,
                      'APISIGN_NOT_PROVIDED': AuthenticationError,
                      'INVALID_SIGNATURE': AuthenticationError,
                      'INVALID_CURRENCY': ExchangeError,
                      'INVALID_PERMISSION': AuthenticationError,
                      'INSUFFICIENT_FUNDS': InsufficientFunds,
                      'INVALID_CEILING_MARKET_BUY': InvalidOrder,
                      'INVALID_FIAT_ACCOUNT': InvalidOrder,
                      'INVALID_ORDER_TYPE': InvalidOrder,
                      'QUANTITY_NOT_PROVIDED': InvalidOrder,
                      'MIN_TRADE_REQUIREMENT_NOT_MET': InvalidOrder,
                      'ORDER_NOT_OPEN': OrderNotFound,
                      'INVALID_ORDER': InvalidOrder,
                      'UUID_INVALID': OrderNotFound,
                      'RATE_NOT_PROVIDED': InvalidOrder, // createLimitBuyOrder ('ETH/BTC', 1, 0)
                      'INVALID_MARKET': BadSymbol, // {"success":false,"message":"INVALID_MARKET","result":null,"explanation":null}
                      'WHITELIST_VIOLATION_IP': PermissionDenied,
                      'DUST_TRADE_DISALLOWED_MIN_VALUE': InvalidOrder,
                      'RESTRICTED_MARKET': BadSymbol,
                      'We are down for scheduled maintenance, but we\u2019ll be back up shortly.': OnMaintenance, // {"success":false,"message":"We are down for scheduled maintenance, but we\u2019ll be back up shortly.","result":null,"explanation":null}
                  },
                  'broad': {
                      'throttled': DDoSProtection,
                      'problem': ExchangeNotAvailable,
                  },
              },
              'options': {
                  'fetchTicker': {
                      'method': 'publicGetMarketsMarketSymbolTicker', // publicGetMarketsMarketSymbolSummary
                  },
                  'fetchTickers': {
                      'method': 'publicGetMarketsTickers', // publicGetMarketsSummaries
                  },
                  'parseOrderStatus': false,
                  'hasAlreadyAuthenticatedSuccessfully': false, // a workaround for APIKEY_INVALID
                  // With certain currencies, like
                  // AEON, BTS, GXS, NXT, SBD, STEEM, STR, XEM, XLM, XMR, XRP
                  // an additional tag / memo / payment id is usually required by exchanges.
                  // With Bittrex some currencies imply the "base address + tag" logic.
                  // The base address for depositing is stored on this.currencies[code]
                  // The base address identifies the exchange as the recipient
                  // while the tag identifies the user account within the exchange
                  // and the tag is retrieved with fetchDepositAddress.
                  'tag': {
                      'NXT': true, // NXT, BURST
                      'CRYPTO_NOTE_PAYMENTID': true, // AEON, XMR
                      'BITSHAREX': true, // BTS
                      'RIPPLE': true, // XRP
                      'NEM': true, // XEM
                      'STELLAR': true, // XLM
                      'STEEM': true, // SBD, GOLOS
                      // https://github.com/ccxt/ccxt/issues/4794
                      // 'LISK': true, // LSK
                  },
                  'subaccountId': undefined,
                  // see the implementation of fetchClosedOrdersV3 below
                  // 'fetchClosedOrdersMethod': 'fetch_closed_orders_v3',
                  'fetchClosedOrdersFilterBySince': true,
                  // 'createOrderMethod': 'create_order_v1',
              },
              'commonCurrencies': {
                  'REPV2': 'REP',
              },
          });
      }
  
      costToPrecision (symbol, cost) {
          return this.decimalToPrecision (cost, TRUNCATE, this.markets[symbol]['precision']['price'], DECIMAL_PLACES);
      }
  
      feeToPrecision (symbol, fee) {
          return this.decimalToPrecision (fee, TRUNCATE, this.markets[symbol]['precision']['price'], DECIMAL_PLACES);
      }
  
      async fetchMarkets (params = {}) {
          const response = await this.publicGetMarkets (params);
          //
          //     [
          //         {
          //             "symbol":"LTC-BTC",
          //             "baseCurrencySymbol":"LTC",
          //             "quoteCurrencySymbol":"BTC",
          //             "minTradeSize":"0.01686767",
          //             "precision":8,
          //             "status":"ONLINE", // "OFFLINE"
          //             "createdAt":"2014-02-13T00:00:00Z"
          //         },
          //         {
          //             "symbol":"VDX-USDT",
          //             "baseCurrencySymbol":"VDX",
          //             "quoteCurrencySymbol":"USDT",
          //             "minTradeSize":"300.00000000",
          //             "precision":8,
          //             "status":"ONLINE", // "OFFLINE"
          //             "createdAt":"2019-05-23T00:41:21.843Z",
          //             "notice":"USDT has swapped to an ERC20-based token as of August 5, 2019."
          //         }
          //     ]
          //
          const result = [];
          for (let i = 0; i < response.length; i++) {
              const market = response[i];
              const baseId = this.safeString (market, 'baseCurrencySymbol');
              const quoteId = this.safeString (market, 'quoteCurrencySymbol');
              const id = this.safeString (market, 'symbol');
              const base = this.safeCurrencyCode (baseId);
              const quote = this.safeCurrencyCode (quoteId);
              const symbol = base + '/' + quote;
              const pricePrecision = this.safeInteger (market, 'precision', 8);
              const precision = {
                  'amount': 8,
                  'price': pricePrecision,
              };
              const status = this.safeString (market, 'status');
              const active = (status === 'ONLINE');
              result.push ({
                  'id': id,
                  'symbol': symbol,
                  'base': base,
                  'quote': quote,
                  'baseId': baseId,
                  'quoteId': quoteId,
                  'active': active,
                  'info': market,
                  'precision': precision,
                  'limits': {
                      'amount': {
                          'min': this.safeFloat (market, 'minTradeSize'),
                          'max': undefined,
                      },
                      'price': {
                          'min': 1 / Math.pow (10, precision['price']),
                          'max': undefined,
                      },
                      'cost': {
                          'min': undefined,
                          'max': undefined,
                      },
                  },
              });
          }
          return result;
      }
  
      async fetchBalance (params = {}) {
          await this.loadMarkets ();
          const balances = await this.privateGetBalances (params);
          const result = { 'info': balances };
          const indexed = this.indexBy (balances, 'currencySymbol');
          const currencyIds = Object.keys (indexed);
          for (let i = 0; i < currencyIds.length; i++) {
              const currencyId = currencyIds[i];
              const code = this.safeCurrencyCode (currencyId);
              const account = this.account ();
              const balance = indexed[currencyId];
              account['free'] = this.safeFloat (balance, 'available');
              account['total'] = this.safeFloat (balance, 'total');
              result[code] = account;
          }
          return this.parseBalance (result);
      }
  
      async fetchOrderBook (symbol, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {
              'marketSymbol': this.marketId (symbol),
          };
          if (limit !== undefined) {
              if ((limit !== 1) && (limit !== 25) && (limit !== 500)) {
                  throw new BadRequest (this.id + ' fetchOrderBook() limit argument must be undefined, 1, 25 or 500, default is 25');
              }
              request['depth'] = limit;
          }
          const response = await this.publicGetMarketsMarketSymbolOrderbook (this.extend (request, params));
          //
          //     {
          //         "bid":[
          //             {"quantity":"0.01250000","rate":"10718.56200003"},
          //             {"quantity":"0.10000000","rate":"10718.56200002"},
          //             {"quantity":"0.39648292","rate":"10718.56200001"},
          //         ],
          //         "ask":[
          //             {"quantity":"0.05100000","rate":"10724.30099631"},
          //             {"quantity":"0.10000000","rate":"10724.30099632"},
          //             {"quantity":"0.26000000","rate":"10724.30099634"},
          //         ]
          //     }
          //
          const sequence = this.safeInteger (this.last_response_headers, 'Sequence');
          const orderbook = this.parseOrderBook (response, undefined, 'bid', 'ask', 'rate', 'quantity');
          orderbook['nonce'] = sequence;
          return orderbook;
      }
  
      async fetchCurrencies (params = {}) {
          const response = await this.publicGetCurrencies (params);
          //
          //     [
          //         {
          //             "symbol":"1ST",
          //             "name":"Firstblood",
          //             "coinType":"ETH_CONTRACT",
          //             "status":"ONLINE",
          //             "minConfirmations":36,
          //             "notice":"",
          //             "txFee":"4.50000000",
          //             "logoUrl":"https://bittrexblobstorage.blob.core.windows.net/public/5685a7be-1edf-4ba0-a313-b5309bb204f8.png",
          //             "prohibitedIn":[],
          //             "baseAddress":"0xfbb1b73c4f0bda4f67dca266ce6ef42f520fbb98",
          //             "associatedTermsOfService":[]
          //         }
          //     ]
          //
          const result = {};
          for (let i = 0; i < response.length; i++) {
              const currency = response[i];
              const id = this.safeString (currency, 'symbol');
              const code = this.safeCurrencyCode (id);
              const precision = 8; // default precision, todo: fix "magic constants"
              const fee = this.safeFloat (currency, 'txFee'); // todo: redesign
              const isActive = this.safeString (currency, 'status');
              result[code] = {
                  'id': id,
                  'code': code,
                  'address': this.safeString (currency, 'baseAddress'),
                  'info': currency,
                  'type': this.safeString (currency, 'coinType'),
                  'name': this.safeString (currency, 'name'),
                  'active': (isActive === 'ONLINE'),
                  'fee': fee,
                  'precision': precision,
                  'limits': {
                      'amount': {
                          'min': 1 / Math.pow (10, precision),
                          'max': undefined,
                      },
                      'price': {
                          'min': 1 / Math.pow (10, precision),
                          'max': undefined,
                      },
                      'cost': {
                          'min': undefined,
                          'max': undefined,
                      },
                      'withdraw': {
                          'min': fee,
                          'max': undefined,
                      },
                  },
              };
          }
          return result;
      }
  
      parseTicker (ticker, market = undefined) {
          //
          // ticker
          //
          //     {
          //         "symbol":"ETH-BTC",
          //         "lastTradeRate":"0.03284496",
          //         "bidRate":"0.03284523",
          //         "askRate":"0.03286857"
          //     }
          //
          // summary
          //
          //     {
          //         "symbol":"ETH-BTC",
          //         "high":"0.03369528",
          //         "low":"0.03282442",
          //         "volume":"4307.83794556",
          //         "quoteVolume":"143.08608869",
          //         "percentChange":"0.79",
          //         "updatedAt":"2020-09-29T07:36:57.823Z"
          //     }
          //
          const timestamp = this.parse8601 (this.safeString (ticker, 'updatedAt'));
          const marketId = this.safeString (ticker, 'symbol');
          const symbol = this.safeSymbol (marketId, market, '-');
          const percentage = this.safeFloat (ticker, 'percentChange');
          const last = this.safeFloat (ticker, 'lastTradeRate');
          return {
              'symbol': symbol,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'high': this.safeFloat (ticker, 'high'),
              'low': this.safeFloat (ticker, 'low'),
              'bid': this.safeFloat (ticker, 'bidRate'),
              'bidVolume': undefined,
              'ask': this.safeFloat (ticker, 'askRate'),
              'askVolume': undefined,
              'vwap': undefined,
              'open': undefined,
              'close': last,
              'last': last,
              'previousClose': undefined,
              'change': undefined,
              'percentage': percentage,
              'average': undefined,
              'baseVolume': this.safeFloat (ticker, 'volume'),
              'quoteVolume': this.safeFloat (ticker, 'quoteVolume'),
              'info': ticker,
          };
      }
  
      async fetchTickers (symbols = undefined, params = {}) {
          await this.loadMarkets ();
          const options = this.safeValue (this.options, 'fetchTickers', {});
          const defaultMethod = this.safeString (options, 'method', 'publicGetMarketsTickers');
          const method = this.safeString (params, 'method', defaultMethod);
          params = this.omit (params, 'method');
          const response = await this[method] (params);
          //
          // publicGetMarketsTickers
          //
          //     [
          //         {
          //             "symbol":"4ART-BTC",
          //             "lastTradeRate":"0.00000210",
          //             "bidRate":"0.00000210",
          //             "askRate":"0.00000215"
          //         }
          //     ]
          //
          // publicGetMarketsSummaries
          //
          //     [
          //         {
          //             "symbol":"4ART-BTC",
          //             "high":"0.00000206",
          //             "low":"0.00000196",
          //             "volume":"14871.32000233",
          //             "quoteVolume":"0.02932756",
          //             "percentChange":"1.48",
          //             "updatedAt":"2020-09-29T07:34:32.757Z"
          //         }
          //     ]
          //
          const tickers = [];
          for (let i = 0; i < response.length; i++) {
              const ticker = this.parseTicker (response[i]);
              tickers.push (ticker);
          }
          return this.filterByArray (tickers, 'symbol', symbols);
      }
  
      async fetchTicker (symbol, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'marketSymbol': market['id'],
          };
          const options = this.safeValue (this.options, 'fetchTicker', {});
          const defaultMethod = this.safeString (options, 'method', 'publicGetMarketsMarketSymbolTicker');
          const method = this.safeString (params, 'method', defaultMethod);
          params = this.omit (params, 'method');
          const response = await this[method] (this.extend (request, params));
          //
          // publicGetMarketsMarketSymbolTicker
          //
          //     {
          //         "symbol":"ETH-BTC",
          //         "lastTradeRate":"0.03284496",
          //         "bidRate":"0.03284523",
          //         "askRate":"0.03286857"
          //     }
          //
          //
          // publicGetMarketsMarketSymbolSummary
          //
          //     {
          //         "symbol":"ETH-BTC",
          //         "high":"0.03369528",
          //         "low":"0.03282442",
          //         "volume":"4307.83794556",
          //         "quoteVolume":"143.08608869",
          //         "percentChange":"0.79",
          //         "updatedAt":"2020-09-29T07:36:57.823Z"
          //     }
          //
          return this.parseTicker (response, market);
      }
  
      parseTrade (trade, market = undefined) {
          //
          // public fetchTrades
          //
          //     {
          //         "id":"9c5589db-42fb-436c-b105-5e2edcb95673",
          //         "executedAt":"2020-10-03T11:48:43.38Z",
          //         "quantity":"0.17939626",
          //         "rate":"0.03297952",
          //         "takerSide":"BUY"
          //     }
          //
          // private fetchOrderTrades
          //
          //     {
          //         "id": "aaa3e9bd-5b86-4a21-8b3d-1275c1d30b8e",
          //         "marketSymbol": "OMG-BTC",
          //         "executedAt": "2020-10-02T16:00:30.3Z",
          //         "quantity": "7.52710000",
          //         "rate": "0.00034907",
          //         "orderId": "3a3dbd33-3a30-4ae5-a41d-68d3c1ac537e",
          //         "commission": "0.00000525",
          //         "isTaker": false
          //     }
          //
          const timestamp = this.parse8601 (this.safeString (trade, 'executedAt'));
          const id = this.safeString (trade, 'id');
          const order = this.safeString (trade, 'orderId');
          const marketId = this.safeString (trade, 'marketSymbol');
          market = this.safeMarket (marketId, market, '-');
          let cost = undefined;
          const price = this.safeFloat (trade, 'rate');
          const amount = this.safeFloat (trade, 'quantity');
          if (amount !== undefined) {
              if (price !== undefined) {
                  cost = price * amount;
              }
          }
          let takerOrMaker = undefined;
          const isTaker = this.safeValue (trade, 'isTaker');
          if (isTaker !== undefined) {
              takerOrMaker = isTaker ? 'taker' : 'maker';
          }
          let fee = undefined;
          const feeCost = this.safeFloat (trade, 'commission');
          if (feeCost !== undefined) {
              fee = {
                  'cost': feeCost,
                  'currency': market['quote'],
              };
          }
          const side = this.safeStringLower (trade, 'takerSide');
          return {
              'info': trade,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'symbol': market['symbol'],
              'id': id,
              'order': order,
              'takerOrMaker': takerOrMaker,
              'type': undefined,
              'side': side,
              'price': price,
              'amount': amount,
              'cost': cost,
              'fee': fee,
          };
      }
  
      async fetchTime (params = {}) {
          const response = await this.publicGetPing (params);
          //
          //     {
          //         "serverTime": 1594596023162
          //     }
          //
          return this.safeInteger (response, 'serverTime');
      }
  
      async fetchTrades (symbol, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const request = {
              'marketSymbol': this.marketId (symbol),
          };
          const response = await this.publicGetMarketsMarketSymbolTrades (this.extend (request, params));
          //
          //     [
          //         {
          //             "id":"9c5589db-42fb-436c-b105-5e2edcb95673",
          //             "executedAt":"2020-10-03T11:48:43.38Z",
          //             "quantity":"0.17939626",
          //             "rate":"0.03297952",
          //             "takerSide":"BUY"
          //         }
          //     ]
          //
          return this.parseTrades (response, market, since, limit);
      }
  
      parseOHLCV (ohlcv, market = undefined) {
          //
          //     {
          //         "startsAt":"2020-06-12T02:35:00Z",
          //         "open":"0.02493753",
          //         "high":"0.02493753",
          //         "low":"0.02493753",
          //         "close":"0.02493753",
          //         "volume":"0.09590123",
          //         "quoteVolume":"0.00239153"
          //     }
          //
          return [
              this.parse8601 (this.safeString (ohlcv, 'startsAt')),
              this.safeFloat (ohlcv, 'open'),
              this.safeFloat (ohlcv, 'high'),
              this.safeFloat (ohlcv, 'low'),
              this.safeFloat (ohlcv, 'close'),
              this.safeFloat (ohlcv, 'volume'),
          ];
      }
  
      async fetchOHLCV (symbol, timeframe = '1m', since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const market = this.market (symbol);
          const reverseId = market['baseId'] + '-' + market['quoteId'];
          const request = {
              'candleInterval': this.timeframes[timeframe],
              'marketSymbol': reverseId,
          };
          let method = 'publicGetMarketsMarketSymbolCandlesCandleIntervalRecent';
          if (since !== undefined) {
              const now = this.milliseconds ();
              const difference = Math.abs (now - since);
              const sinceDate = this.ymd (since);
              const parts = sinceDate.split ('-');
              const sinceYear = this.safeInteger (parts, 0);
              const sinceMonth = this.safeInteger (parts, 1);
              const sinceDay = this.safeInteger (parts, 2);
              if (timeframe === '1d') {
                  // if the since argument is beyond one year into the past
                  if (difference > 31622400000) {
                      method = 'publicGetMarketsMarketSymbolCandlesCandleIntervalHistoricalYear';
                      request['year'] = sinceYear;
                  }
                  // request['year'] = year;
              } else if (timeframe === '1h') {
                  // if the since argument is beyond 31 days into the past
                  if (difference > 2678400000) {
                      method = 'publicGetMarketsMarketSymbolCandlesCandleIntervalHistoricalYearMonth';
                      request['year'] = sinceYear;
                      request['month'] = sinceMonth;
                  }
              } else {
                  // if the since argument is beyond 1 day into the past
                  if (difference > 86400000) {
                      method = 'publicGetMarketsMarketSymbolCandlesCandleIntervalHistoricalYearMonthDay';
                      request['year'] = sinceYear;
                      request['month'] = sinceMonth;
                      request['day'] = sinceDay;
                  }
              }
          }
          const response = await this[method] (this.extend (request, params));
          //
          //     [
          //         {"startsAt":"2020-06-12T02:35:00Z","open":"0.02493753","high":"0.02493753","low":"0.02493753","close":"0.02493753","volume":"0.09590123","quoteVolume":"0.00239153"},
          //         {"startsAt":"2020-06-12T02:40:00Z","open":"0.02491874","high":"0.02491874","low":"0.02490970","close":"0.02490970","volume":"0.04515695","quoteVolume":"0.00112505"},
          //         {"startsAt":"2020-06-12T02:45:00Z","open":"0.02490753","high":"0.02493143","low":"0.02490753","close":"0.02493143","volume":"0.17769640","quoteVolume":"0.00442663"}
          //     ]
          //
          return this.parseOHLCVs (response, market, timeframe, since, limit);
      }
  
      async fetchOpenOrders (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {};
          let market = undefined;
          if (symbol !== undefined) {
              market = this.market (symbol);
              request['marketSymbol'] = market['id'];
          }
          const response = await this.privateGetOrdersOpen (this.extend (request, params));
          return this.parseOrders (response, market, since, limit);
      }
  
      async fetchOrderTrades (id, symbol = undefined, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {
              'orderId': id,
          };
          const response = await this.privateGetOrdersOrderIdExecutions (this.extend (request, params));
          let market = undefined;
          if (symbol !== undefined) {
              market = this.market (symbol);
          }
          return this.parseTrades (response, market, since, limit);
      }
  
      async createOrder (symbol, type, side, amount, price = undefined, params = {}) {
          // A ceiling order is a market or limit order that allows you to specify
          // the amount of quote currency you want to spend (or receive, if selling)
          // instead of the quantity of the market currency (e.g. buy $100 USD of BTC
          // at the current market BTC price)
          await this.loadMarkets ();
          const market = this.market (symbol);
          const uppercaseType = type.toUpperCase ();
          const reverseId = market['baseId'] + '-' + market['quoteId'];
          const request = {
              'marketSymbol': reverseId,
              'direction': side.toUpperCase (),
              'type': uppercaseType, // LIMIT, MARKET, CEILING_LIMIT, CEILING_MARKET
              // 'quantity': this.amountToPrecision (symbol, amount), // required for limit orders, excluded for ceiling orders
              // 'ceiling': this.priceToPrecision (symbol, price), // required for ceiling orders, excluded for non-ceiling orders
              // 'limit': this.priceToPrecision (symbol, price), // required for limit orders, excluded for market orders
              // 'timeInForce': 'GOOD_TIL_CANCELLED', // IMMEDIATE_OR_CANCEL, FILL_OR_KILL, POST_ONLY_GOOD_TIL_CANCELLED
              // 'useAwards': false, // optional
          };
          const isCeilingLimit = (uppercaseType === 'CEILING_LIMIT');
          const isCeilingMarket = (uppercaseType === 'CEILING_MARKET');
          const isCeilingOrder = isCeilingLimit || isCeilingMarket;
          if (isCeilingOrder) {
              let cost = undefined;
              if (isCeilingLimit) {
                  request['limit'] = this.priceToPrecision (symbol, price);
                  cost = this.safeFloat2 (params, 'ceiling', 'cost', amount);
              } else if (isCeilingMarket) {
                  cost = this.safeFloat2 (params, 'ceiling', 'cost');
                  if (cost === undefined) {
                      if (price === undefined) {
                          cost = amount;
                      } else {
                          cost = amount * price;
                      }
                  }
              }
              params = this.omit (params, [ 'ceiling', 'cost' ]);
              request['ceiling'] = this.costToPrecision (symbol, cost);
              // bittrex only accepts IMMEDIATE_OR_CANCEL or FILL_OR_KILL for ceiling orders
              request['timeInForce'] = 'IMMEDIATE_OR_CANCEL';
          } else {
              request['quantity'] = this.amountToPrecision (symbol, amount);
              if (uppercaseType === 'LIMIT') {
                  request['limit'] = this.priceToPrecision (symbol, price);
                  request['timeInForce'] = 'GOOD_TIL_CANCELLED';
              } else {
                  // bittrex does not allow GOOD_TIL_CANCELLED for market orders
                  request['timeInForce'] = 'IMMEDIATE_OR_CANCEL';
              }
          }
          const response = await this.privatePostOrders (this.extend (request, params));
          //
          //     {
          //         id: 'f03d5e98-b5ac-48fb-8647-dd4db828a297',
          //         marketSymbol: 'BTC-USDT',
          //         direction: 'SELL',
          //         type: 'LIMIT',
          //         quantity: '0.01',
          //         limit: '6000',
          //         timeInForce: 'GOOD_TIL_CANCELLED',
          //         fillQuantity: '0.00000000',
          //         commission: '0.00000000',
          //         proceeds: '0.00000000',
          //         status: 'OPEN',
          //         createdAt: '2020-03-18T02:37:33.42Z',
          //         updatedAt: '2020-03-18T02:37:33.42Z'
          //       }
          //
          return this.parseOrder (response, market);
      }
  
      async cancelOrder (id, symbol = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {
              'orderId': id,
          };
          const response = await this.privateDeleteOrdersOrderId (this.extend (request, params));
          return this.extend (this.parseOrder (response), {
              'id': id,
              'info': response,
              'status': 'canceled',
          });
      }
  
      async cancelAllOrders (symbol = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {};
          let market = undefined;
          if (symbol !== undefined) {
              market = this.market (symbol);
              request['marketSymbol'] = market['id'];
          }
          const response = await this.privateDeleteOrdersOpen (this.extend (request, params));
          //
          //     [
          //         {
          //             "id":"66582be0-5337-4d8c-b212-c356dd525801",
          //             "statusCode":"SUCCESS",
          //             "result":{
          //                 "id":"66582be0-5337-4d8c-b212-c356dd525801",
          //                 "marketSymbol":"BTC-USDT",
          //                 "direction":"BUY",
          //                 "type":"LIMIT",
          //                 "quantity":"0.01000000",
          //                 "limit":"3000.00000000",
          //                 "timeInForce":"GOOD_TIL_CANCELLED",
          //                 "fillQuantity":"0.00000000",
          //                 "commission":"0.00000000",
          //                 "proceeds":"0.00000000",
          //                 "status":"CLOSED",
          //                 "createdAt":"2020-10-06T12:31:53.39Z",
          //                 "updatedAt":"2020-10-06T12:54:28.8Z",
          //                 "closedAt":"2020-10-06T12:54:28.8Z"
          //             }
          //         }
          //     ]
          //
          const orders = [];
          for (let i = 0; i < response.length; i++) {
              const result = this.safeValue (response[i], 'result', {});
              orders.push (result);
          }
          return this.parseOrders (orders, market);
      }
  
      async fetchDeposits (code = undefined, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          // https://support.bittrex.com/hc/en-us/articles/115003723911
          const request = {};
          let currency = undefined;
          if (code !== undefined) {
              currency = this.currency (code);
              request['currencySymbol'] = currency['id'];
          }
          const response = await this.privateGetDepositsClosed (this.extend (request, params));
          // we cannot filter by `since` timestamp, as it isn't set by Bittrex
          // see https://github.com/ccxt/ccxt/issues/4067
          // return this.parseTransactions (response, currency, since, limit);
          return this.parseTransactions (response, currency, undefined, limit);
      }
  
      async fetchWithdrawals (code = undefined, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          // https://support.bittrex.com/hc/en-us/articles/115003723911
          const request = {};
          let currency = undefined;
          if (code !== undefined) {
              currency = this.currency (code);
              request['currencySymbol'] = currency['id'];
          }
          const response = await this.privateGetWithdrawalsClosed (this.extend (request, params));
          return this.parseTransactions (response, currency, since, limit);
      }
  
      parseTransaction (transaction, currency = undefined) {
          //
          // fetchDeposits
          //     {
          //         "id": "d00fdf2e-df9e-48f1-....",
          //         "currencySymbol": "BTC",
          //         "quantity": "0.00550000",
          //         "cryptoAddress": "1PhmYjnJPZH5NUwV8AU...",
          //         "txId": "d1f1afffe1b9b6614eaee7e8133c85d98...",
          //         "confirmations": 2,
          //         "updatedAt": "2020-01-12T16:49:30.41Z",
          //         "completedAt": "2020-01-12T16:49:30.41Z",
          //         "status": "COMPLETED",
          //         "source": "BLOCKCHAIN"
          //     }
          //
          // fetchWithdrawals
          //     {
          //         "PaymentUuid" : "e293da98-788c-4188-a8f9-8ec2c33fdfcf",
          //         "Currency" : "XC",
          //         "Amount" : 7513.75121715,
          //         "Address" : "EVnSMgAd7EonF2Dgc4c9K14L12RBaW5S5J",
          //         "Opened" : "2014-07-08T23:13:31.83",
          //         "Authorized" : true,
          //         "PendingPayment" : false,
          //         "TxCost" : 0.00002000,
          //         "TxId" : "b4a575c2a71c7e56d02ab8e26bb1ef0a2f6cf2094f6ca2116476a569c1e84f6e",
          //         "Canceled" : false,
          //         "InvalidAddress" : false
          //     }
          //
          const id = this.safeString (transaction, 'id');
          const amount = this.safeFloat (transaction, 'quantity');
          const address = this.safeString (transaction, 'cryptoAddress');
          const txid = this.safeString (transaction, 'txId');
          const updated = this.parse8601 (this.safeString (transaction, 'updatedAt'));
          const opened = this.parse8601 (this.safeString (transaction, 'createdAt'));
          const timestamp = opened ? opened : updated;
          const type = (opened === undefined) ? 'deposit' : 'withdrawal';
          const currencyId = this.safeString (transaction, 'currencySymbol');
          const code = this.safeCurrencyCode (currencyId, currency);
          let status = 'pending';
          if (type === 'deposit') {
              //
              // deposits numConfirmations never reach the minConfirmations number
              // we set all of them to 'ok', otherwise they'd all be 'pending'
              //
              //     const numConfirmations = this.safeInteger (transaction, 'Confirmations', 0);
              //     const minConfirmations = this.safeInteger (currency['info'], 'MinConfirmation');
              //     if (numConfirmations >= minConfirmations) {
              //         status = 'ok';
              //     }
              //
              status = 'ok';
          } else {
              const responseStatus = this.safeString (transaction, 'status');
              if (responseStatus === 'ERROR_INVALID_ADDRESS') {
                  status = 'failed';
              } else if (responseStatus === 'CANCELLED') {
                  status = 'canceled';
              } else if (responseStatus === 'PENDING') {
                  status = 'pending';
              } else if (responseStatus === 'COMPLETED') {
                  status = 'ok';
              } else if (responseStatus === 'AUTHORIZED' && (txid !== undefined)) {
                  status = 'ok';
              }
          }
          let feeCost = this.safeFloat (transaction, 'txCost');
          if (feeCost === undefined) {
              if (type === 'deposit') {
                  // according to https://support.bittrex.com/hc/en-us/articles/115000199651-What-fees-does-Bittrex-charge-
                  feeCost = 0;
              }
          }
          return {
              'info': transaction,
              'id': id,
              'currency': code,
              'amount': amount,
              'address': address,
              'tag': undefined,
              'status': status,
              'type': type,
              'updated': updated,
              'txid': txid,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'fee': {
                  'currency': code,
                  'cost': feeCost,
              },
          };
      }
  
      parseTimeInForce (timeInForce) {
          const timeInForces = {
              'GOOD_TIL_CANCELLED': 'GTC',
              'IMMEDIATE_OR_CANCEL': 'IOC',
              'FILL_OR_KILL': 'FOK',
              'POST_ONLY_GOOD_TIL_CANCELLED': 'PO',
          };
          return this.safeString (timeInForces, timeInForce, timeInForce);
      }
  
      parseOrder (order, market = undefined) {
          //
          //     {
          //         id: '1be35109-b763-44ce-b6ea-05b6b0735c0c',
          //         marketSymbol: 'LTC-ETH',
          //         direction: 'BUY',
          //         type: 'LIMIT',
          //         quantity: '0.50000000',
          //         limit: '0.17846699',
          //         timeInForce: 'GOOD_TIL_CANCELLED',
          //         fillQuantity: '0.50000000',
          //         commission: '0.00022286',
          //         proceeds: '0.08914915',
          //         status: 'CLOSED',
          //         createdAt: '2018-06-23T13:14:28.613Z',
          //         updatedAt: '2018-06-23T13:14:30.19Z',
          //         closedAt: '2018-06-23T13:14:30.19Z'
          //     }
          //
          const marketSymbol = this.safeString (order, 'marketSymbol');
          market = this.safeMarket (marketSymbol, market, '-');
          const symbol = market['symbol'];
          const feeCurrency = market['quote'];
          const direction = this.safeStringLower (order, 'direction');
          const createdAt = this.safeString (order, 'createdAt');
          const updatedAt = this.safeString (order, 'updatedAt');
          const closedAt = this.safeString (order, 'closedAt');
          let lastTradeTimestamp = undefined;
          if (closedAt !== undefined) {
              lastTradeTimestamp = this.parse8601 (closedAt);
          } else if (updatedAt) {
              lastTradeTimestamp = this.parse8601 (updatedAt);
          }
          const timestamp = this.parse8601 (createdAt);
          const type = this.safeStringLower (order, 'type');
          const quantity = this.safeFloat (order, 'quantity');
          const limit = this.safeFloat (order, 'limit');
          const fillQuantity = this.safeFloat (order, 'fillQuantity');
          const commission = this.safeFloat (order, 'commission');
          const proceeds = this.safeFloat (order, 'proceeds');
          const status = this.safeStringLower (order, 'status');
          const timeInForce = this.parseTimeInForce (this.safeString (order, 'timeInForce'));
          const postOnly = (timeInForce === 'PO');
          return this.safeOrder ({
              'id': this.safeString (order, 'id'),
              'clientOrderId': undefined,
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'lastTradeTimestamp': lastTradeTimestamp,
              'symbol': symbol,
              'type': type,
              'timeInForce': timeInForce,
              'postOnly': postOnly,
              'side': direction,
              'price': limit,
              'stopPrice': undefined,
              'cost': proceeds,
              'average': undefined,
              'amount': quantity,
              'filled': fillQuantity,
              'remaining': undefined,
              'status': status,
              'fee': {
                  'cost': commission,
                  'currency': feeCurrency,
              },
              'info': order,
              'trades': undefined,
          });
      }
  
      parseOrders (orders, market = undefined, since = undefined, limit = undefined, params = {}) {
          if (this.options['fetchClosedOrdersFilterBySince']) {
              return super.parseOrders (orders, market, since, limit, params);
          } else {
              return super.parseOrders (orders, market, undefined, limit, params);
          }
      }
  
      parseOrderStatus (status) {
          const statuses = {
              'CLOSED': 'closed',
              'OPEN': 'open',
              'CANCELLED': 'canceled',
              'CANCELED': 'canceled',
          };
          return this.safeString (statuses, status, status);
      }
  
      async fetchOrder (id, symbol = undefined, params = {}) {
          await this.loadMarkets ();
          let response = undefined;
          try {
              const request = {
                  'orderId': id,
              };
              response = await this.privateGetOrdersOrderId (this.extend (request, params));
          } catch (e) {
              if (this.last_json_response) {
                  const message = this.safeString (this.last_json_response, 'message');
                  if (message === 'UUID_INVALID') {
                      throw new OrderNotFound (this.id + ' fetchOrder() error: ' + this.last_http_response);
                  }
              }
              throw e;
          }
          return this.parseOrder (response);
      }
  
      orderToTrade (order) {
          // this entire method should be moved to the base class
          const timestamp = this.safeInteger2 (order, 'lastTradeTimestamp', 'timestamp');
          return {
              'id': this.safeString (order, 'id'),
              'side': this.safeString (order, 'side'),
              'order': this.safeString (order, 'id'),
              'type': this.safeString (order, 'type'),
              'price': this.safeFloat (order, 'average'),
              'amount': this.safeFloat (order, 'filled'),
              'cost': this.safeFloat (order, 'cost'),
              'symbol': this.safeString (order, 'symbol'),
              'timestamp': timestamp,
              'datetime': this.iso8601 (timestamp),
              'fee': this.safeValue (order, 'fee'),
              'info': order,
              'takerOrMaker': undefined,
          };
      }
  
      ordersToTrades (orders) {
          // this entire method should be moved to the base class
          const result = [];
          for (let i = 0; i < orders.length; i++) {
              result.push (this.orderToTrade (orders[i]));
          }
          return result;
      }
  
      async fetchMyTrades (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {};
          if (limit !== undefined) {
              request['pageSize'] = limit;
          }
          if (since !== undefined) {
              request['startDate'] = this.ymdhms (since, 'T') + 'Z';
          }
          let market = undefined;
          if (symbol !== undefined) {
              market = this.market (symbol);
              // because of this line we will have to rethink the entire v3
              // in other words, markets define all the rest of the API
              // and v3 market ids are reversed in comparison to v1
              // v3 has to be a completely separate implementation
              // otherwise we will have to shuffle symbols and currencies everywhere
              // which is prone to errors, as was shown here
              // https://github.com/ccxt/ccxt/pull/5219#issuecomment-499646209
              request['marketSymbol'] = market['base'] + '-' + market['quote'];
          }
          const response = await this.privateGetOrdersClosed (this.extend (request, params));
          const orders = this.parseOrders (response, market);
          const trades = this.ordersToTrades (orders);
          return this.filterBySymbolSinceLimit (trades, symbol, since, limit);
      }
  
      async fetchClosedOrders (symbol = undefined, since = undefined, limit = undefined, params = {}) {
          await this.loadMarkets ();
          const request = {};
          if (limit !== undefined) {
              request['pageSize'] = limit;
          }
          if (since !== undefined) {
              request['startDate'] = this.ymdhms (since, 'T') + 'Z';
          }
          let market = undefined;
          if (symbol !== undefined) {
              market = this.market (symbol);
              // because of this line we will have to rethink the entire v3
              // in other words, markets define all the rest of the API
              // and v3 market ids are reversed in comparison to v1
              // v3 has to be a completely separate implementation
              // otherwise we will have to shuffle symbols and currencies everywhere
              // which is prone to errors, as was shown here
              // https://github.com/ccxt/ccxt/pull/5219#issuecomment-499646209
              request['marketSymbol'] = market['base'] + '-' + market['quote'];
          }
          const response = await this.privateGetOrdersClosed (this.extend (request, params));
          return this.parseOrders (response, market, since, limit);
      }
  
      async createDepositAddress (code, params = {}) {
          await this.loadMarkets ();
          const currency = this.currency (code);
          const request = {
              'currencySymbol': currency['id'],
          };
          const response = await this.privatePostAddresses (this.extend (request, params));
          //
          //     {
          //         "status":"PROVISIONED",
          //         "currencySymbol":"XRP",
          //         "cryptoAddress":"rPVMhWBsfF9iMXYj3aAzJVkPDTFNSyWdKy",
          //         "cryptoAddressTag":"392034158"
          //     }
          //
          let address = this.safeString (response, 'cryptoAddress');
          const message = this.safeString (response, 'status');
          if (!address || message === 'REQUESTED') {
              throw new AddressPending (this.id + ' the address for ' + code + ' is being generated (pending, not ready yet, retry again later)');
          }
          let tag = this.safeString (response, 'cryptoAddressTag');
          if ((tag === undefined) && (currency['type'] in this.options['tag'])) {
              tag = address;
              address = currency['address'];
          }
          this.checkAddress (address);
          return {
              'currency': code,
              'address': address,
              'tag': tag,
              'info': response,
          };
      }
  
      async fetchDepositAddress (code, params = {}) {
          await this.loadMarkets ();
          const currency = this.currency (code);
          const request = {
              'currencySymbol': currency['id'],
          };
          const response = await this.privateGetAddressesCurrencySymbol (this.extend (request, params));
          //
          //     {
          //         "status":"PROVISIONED",
          //         "currencySymbol":"XRP",
          //         "cryptoAddress":"rPVMhWBsfF9iMXYj3aAzJVkPDTFNSyWdKy",
          //         "cryptoAddressTag":"392034158"
          //     }
          //
          let address = this.safeString (response, 'cryptoAddress');
          const message = this.safeString (response, 'status');
          if (!address || message === 'REQUESTED') {
              throw new AddressPending (this.id + ' the address for ' + code + ' is being generated (pending, not ready yet, retry again later)');
          }
          let tag = this.safeString (response, 'cryptoAddressTag');
          if ((tag === undefined) && (currency['type'] in this.options['tag'])) {
              tag = address;
              address = currency['address'];
          }
          this.checkAddress (address);
          return {
              'currency': code,
              'address': address,
              'tag': tag,
              'info': response,
          };
      }
  
      async withdraw (code, amount, address, tag = undefined, params = {}) {
          this.checkAddress (address);
          await this.loadMarkets ();
          const currency = this.currency (code);
          const request = {
              'currencySymbol': currency['id'],
              'quantity': amount,
              'cryptoAddress': address,
          };
          if (tag !== undefined) {
              request['cryptoAddressTag'] = tag;
          }
          const response = await this.privatePostWithdrawals (this.extend (request, params));
          const id = this.safeString (response, 'id');
          return {
              'info': response,
              'id': id,
          };
      }
  
      sign (path, api = 'v3', method = 'GET', params = {}, headers = undefined, body = undefined) {
          let url = this.implodeParams (this.urls['api'][api], {
              'hostname': this.hostname,
          }) + '/';
          if (api === 'private') {
              url += this.version + '/';
              this.checkRequiredCredentials ();
              url += this.implodeParams (path, params);
              params = this.omit (params, this.extractParams (path));
              let hashString = '';
              if (method === 'POST') {
                  body = this.json (params);
                  hashString = body;
              } else {
                  if (Object.keys (params).length) {
                      url += '?' + this.rawencode (params);
                  }
              }
              const contentHash = this.hash (this.encode (hashString), 'sha512', 'hex');
              const timestamp = this.milliseconds ().toString ();
              let auth = timestamp + url + method + contentHash;
              const subaccountId = this.safeValue (this.options, 'subaccountId');
              if (subaccountId !== undefined) {
                  auth += subaccountId;
              }
              const signature = this.hmac (this.encode (auth), this.encode (this.secret), 'sha512');
              headers = {
                  'Api-Key': this.apiKey,
                  'Api-Timestamp': timestamp,
                  'Api-Content-Hash': contentHash,
                  'Api-Signature': signature,
              };
              if (subaccountId !== undefined) {
                  headers['Api-Subaccount-Id'] = subaccountId;
              }
              if (method === 'POST') {
                  headers['Content-Type'] = 'application/json';
              }
          } else {
              if (api === 'public') {
                  url += this.version + '/';
              }
              url += this.implodeParams (path, params);
              params = this.omit (params, this.extractParams (path));
              if (Object.keys (params).length) {
                  url += '?' + this.urlencode (params);
              }
          }
          return { 'url': url, 'method': method, 'body': body, 'headers': headers };
      }
  
      handleErrors (code, reason, url, method, headers, body, response, requestHeaders, requestBody) {
          if (response === undefined) {
              return; // fallback to default error handler
          }
          //
          //     { success: false, message: "message" }
          //
          if (body[0] === '{') {
              const feedback = this.id + ' ' + body;
              let success = this.safeValue (response, 'success');
              if (success === undefined) {
                  const code = this.safeString (response, 'code');
                  if (code !== undefined) {
                      this.throwExactlyMatchedException (this.exceptions['exact'], code, feedback);
                      this.throwBroadlyMatchedException (this.exceptions['broad'], code, feedback);
                  }
                  if ((code === 'NOT_FOUND') && (url.indexOf ('addresses') >= 0)) {
                      throw new InvalidAddress (feedback);
                  }
                  // throw new ExchangeError (this.id + ' malformed response ' + this.json (response));
                  return;
              }
              if (typeof success === 'string') {
                  // bleutrade uses string instead of boolean
                  success = (success === 'true');
              }
              if (!success) {
                  const message = this.safeString (response, 'message');
                  if (message === 'APIKEY_INVALID') {
                      if (this.options['hasAlreadyAuthenticatedSuccessfully']) {
                          throw new DDoSProtection (feedback);
                      } else {
                          throw new AuthenticationError (feedback);
                      }
                  }
                  // https://github.com/ccxt/ccxt/issues/4932
                  // the following two lines are now redundant, see line 171 in describe()
                  //
                  //     if (message === 'DUST_TRADE_DISALLOWED_MIN_VALUE_50K_SAT')
                  //         throw new InvalidOrder (this.id + ' order cost should be over 50k satoshi ' + this.json (response));
                  //
                  if (message === 'INVALID_ORDER') {
                      // Bittrex will return an ambiguous INVALID_ORDER message
                      // upon canceling already-canceled and closed orders
                      // therefore this special case for cancelOrder
                      // let url = 'https://bittrex.com/api/v1.1/market/cancel?apikey=API_KEY&uuid=ORDER_UUID'
                      const cancel = 'cancel';
                      const indexOfCancel = url.indexOf (cancel);
                      if (indexOfCancel >= 0) {
                          const urlParts = url.split ('?');
                          const numParts = urlParts.length;
                          if (numParts > 1) {
                              const query = urlParts[1];
                              const params = query.split ('&');
                              const numParams = params.length;
                              let orderId = undefined;
                              for (let i = 0; i < numParams; i++) {
                                  const param = params[i];
                                  const keyValue = param.split ('=');
                                  if (keyValue[0] === 'uuid') {
                                      orderId = keyValue[1];
                                      break;
                                  }
                              }
                              if (orderId !== undefined) {
                                  throw new OrderNotFound (this.id + ' cancelOrder ' + orderId + ' ' + this.json (response));
                              } else {
                                  throw new OrderNotFound (this.id + ' cancelOrder ' + this.json (response));
                              }
                          }
                      }
                  }
                  this.throwExactlyMatchedException (this.exceptions['exact'], message, feedback);
                  if (message !== undefined) {
                      this.throwBroadlyMatchedException (this.exceptions['broad'], message, feedback);
                  }
                  throw new ExchangeError (feedback);
              }
          }
      }
  };
  