Flutter BX Exchange

Flutter BX Exchange is a Flutter's library for calling API of the https://bx.in.th. package on Pub.dev

Installation

Add dependencies in pubspec.yaml

flutter_bx_exchange: 1.0.0

Usage

Import the package to your project.

import 'package:flutter_bx_exchange/bx_exchange_service.dart';

Using Public API

Create instance without API Key.

var bx = BxExchangeService();

Market Data (Ticker)

Returns a list of all currency pairings including symbol currency, current price, volume in 24 hr, change in 24 hr.

This is a public API. you can access JSON in https://bx.in.th/api/ directly.

[GET]
https://bx.in.th/api/

Using in Flutter.

List<BxPairCurrencyBxDao> list = await bx.fetchMarketData();
for(var currency in list){
    //    currency.pairingId;
    //    currency.primaryCurrency;
    //    currency.secondaryCurrency;
    //    currency.lastPrice;
    //    currency.volume24hours;
    //    currency.orderbook;
}

Current Pairing Currency

Returns a list of all available currency pairings, including their "pairing_id" which is required for some API calls. Will also include the minimum order amount for primary and secondary currency in each pairing market.

This is a public API. you can access JSON in https://bx.in.th/api/pairing/ directly.

[GET]
https://bx.in.th/api/pairing/

Using in Flutter.

List<BxPairCurrencyMetaDao> list = await bx.fetchCurrentPairings();
for(var currency in list){
    //    currency.pairingId;
    //    currency.primaryCurrency;
    //    currency.secondaryCurrency;
    //    currency.active;
    //    currency.primaryMin;
  }

Order Book Summary

Returns a list of all buy and sell orders in the order book for the selected pairing market.

This is a public API. you can access JSON in https://bx.in.th/api/orderbook/?pairing=1 directly.

[GET]
https://bx.in.th/api/orderbook/?pairing={pairing_id}

Using in Flutter.

var orderbook = await bx.fetchOrderBook(pairingId: 1); // 1 is BTC/THB
//  orderbook.pairingsId;
//  orderbook.asks;
//  orderbook.bids;

Recent Trade

Returns a list of 10 most recent trades, and top 10 asks and bids in order book.

This is a public API. you can access JSON in https://bx.in.th/api/trade/?pairing=1 directly.

[GET]
https://bx.in.th/api/trade/?pairing={pairing_id}

Using in Flutter.

var recent = await bx.fetchRecentTrade(pairingId: 1); // 1 is BTC/THB
//  recent.pairingId;
//  recent.highBid;
//  recent.lowAsk;
//  recent.trades;

Historical Trade Data

Returns Weighted Average, Volume, Open, Close, Low and High prices for the specified date.

This is a public API. you can access JSON in https://bx.in.th/api/tradehistory/?pairing=1&date=2019-01-01 directly.

[GET]
https://bx.in.th/api/tradehistory/?pairing={pairing_id}&date={date}

var history = await bx.fetchHistoricalTradeData(pairingId: 1, date: "2019-07-01");
//  history.high;
//  history.low;
//  history.avg;
//  history.open;
//  history.volume;

Prepare Private API

Prepare 3 API keys With different permissions.

1. General API key

General API key are used for reading general information, such as balance, open orders , deposit address.

required permissions : balance and deposit. 

2. Crate Order API key

Crate Order API key are used for creating order.

required permissions : create order. (Recommended to enable 2FA for safety.)

3. Cancel Order API key

Cancel Order API key are used for canceling order.

required permissions : cancel order. (Recommended to enable 2FA for safety.)

Using Private API

Create instance with 3 API keys different permissions.

var bx = BxExchangeService(
  apiKeyGeneral:     BxApiKey(apiKey: "........", secret: "........"),
  apiKeyCreateOrder: BxApiKey(apiKey: "........", secret: "........"),
  apiKeyCancelOrder: BxApiKey(apiKey: "........", secret: "........"),
);

Get Balance

Return all currencies with balance information including available, withdrawals, deposit, open order.

  var response = await bx.fetchBalance();
  if(response.success){
    var balances = response.balance;
    for(var balance in balances.listBalanceCurrency){
      //  balance.currency;
      //  balance.available;
      //  balance.deposits;
      //  balance.orders;
      //  balance.total;
      //  balance.withdrawals;
    }
  }else{
    print(response.error);
  }

Get Open Orders

Returns current orders with option BUY / SELL.

  var response = await bx.fetchOpenOrders(pairingId: 1, orderType: BxTradeType.SELL);
    if(response.success){
    for(var order in response.orders){
      //  order.pairingId;
      //  order.orderId;
      //  order.orderType;
      //  order.rate;
      //  order.amount;
      //  order.date;
    }
  }else{
    print(response.error);
  }

Get Transaction History

Get your own balance affecting transaction history, such as trades, withdrawals and deposits.

  var response = await bx.fetchTransactionHistory();
  if (response.success) {
    for (var tx in response.transactions) {
      //  tx.currency;
      //  tx.amount;
      //  tx.transactionId;
      //  tx.date;
      //  tx.type;
      //  tx.refId;
    }
  } else {
    print(response.error);
  }

You can add conditions to display various history transactions.

  var response = await bx.fetchTransactionHistory(
                              currency: "BTC", 
                              transactionType: BxTransactionType.WITHDRAW, 
                              startDate: "2019-01-01", 
                              endDate: "2019-05-01");

Get Withdraw History

Return all transactions that about withdrawal.

  var response  = await bx.fetchWithdrawHistory();
  if(response.success){
    for(var tx in response.withdrawals){
      //  tx.transactionId;
      //  tx.currency;
      //  tx.amount;
      //  tx.address;
      //  tx.dateRequested;
      //  tx.withdrawalId;
      //  tx.withdrawalStatus;
    }
  }else{
    //  print(response.error); 
  }

Get Deposit Address

Return deposit address of wallet.

  var response = await bx.fetchDepositAddress(currency: "BTC");
  if(response.success){
    // response.address;
  }else{
    print(response.error);
  }

Generate new deposit address.

  var response = await bx.fetchDepositAddress(currency: "BTC",generateNewAddress: true);

Create Order

Create order to market require CREATE ORDER permission. This method use Create Order API key. The parameter require pairing id, tradeType, amount, rate. 2FA is a optional.

  var response = await bx.createOrder(
                          pairingId: 1, 
                          tradeType: BxTradeType.SELL, 
                          amount: 0.001, 
                          rate: 1000000, 
                          twoFactorAuth: '123456');
  if (response.success) {
     // response.orderId;
     // response.historyId;
  } else {
    print(response.error);
  }

Cancel Order

Cancel order to market require CANCEL ORDER permission. This method use Cancel Order API key. The parameter require pairing id and order id. 2FA is a optional.

  var response = await bx.cancelOrder(
                        pairingId: 1,
                        orderId: 4567890,
                        twoFactorAuth: '123456');
  if (response.success) {
    //
  } else {
    print(response.error);
  }

Other uses

Suggestions for other uses

Pairing Currency ID

You can use BxPairCurrency class instead integer.

Example

var history = await bx.fetchHistoricalTradeData(pairingId: BxPairCurrency.THB_BTC);

Print JSON

display JSON response on console or logcat.

await bx.fetchMarketData(printJson: true);

Create Signature

Create a signature and display it on the console so you can apply this signature to other tools such as Postman. and This signature will not be actually delivered to the server.

bx.printSignature(
              BxApiKey(
                apiKey: "123456789", 
                secret: "123456789"
              ));

Example displaying signature on console.

I/flutter ( 1919): apiKey = 123456789
I/flutter ( 1919): nonce = 1562569793537
I/flutter ( 1919): signature = 1ddf4d56df9a34abd83530d96d6df450fd3d2e2f0c910b55a79fbacce1e3e4ca