Buy and sell Bitcoin on an open exchange

Exincore, introduced in the previous chapter, allows you to buy and sell assets at market prices in 1 second. If you want to buy and sell at a limited price, or buy and sell some assets that Exincore doesn’t support, you need OceanOne.

Plan 2: Order Ocean.One exchange

Ocean. One is a Mixin network-based decentralized exchange that is just as friendly as a central exchange. You can trade any asset on OceanOne. You only need to transfer your currency to OceanOne and write the transaction information in the memo of the transaction. OceanOne will list your trading requirements in the market.

• No registration with OceanOne is required
• There is no need to deposit money in the exchange
• Support all Mixin Network transferable assets, all ERC20 EOS tokens.

Preliminary knowledge:

You first need to create a robot, the method in tutorial 1.

Installing dependency packages

As we introduced tutorial 1, we need to rely on mixins — Java SDK, you should install it first, zhang/mixin_labs – Java – bot/blob/master/README. Md).

Install required packages

Lesson 4, which was already installed in the last lesson.

Charge coins into the Mixin Network and read out its balance.

This demonstrates buying BTC with USDT or buying USDT with BTC. Check your wallet address before making a transaction. The complete steps are as follows:

• Check bitcoin or USDT balance, wallet address. And write down the address of the wallet.
• From a third party exchange or your cold wallet, charge the coins to the above wallet address.
• Check the balance of currency again to see whether the account is accounted. (Bitcoin’s arrival time is about 100 minutes at a height of five blocks).

Bitcoin and USDT recharge address is the same.

  private static final String BTC_ASSET_ID     = "c6d0c728-2624-429b-8e0d-d9d19b6592fa";
  private static final String EOS_ASSET_ID     = "6cfe566e-4aad-470b-8c9a-2fd35b49c68d";
  private static final String USDT_ASSET_ID    = "815b0b1a-2764-3736-8faa-42d694fa620a";

  MixinAPI mixinApiUser = generateAPI_FromCSV();
  JsonObject asset = mixinApiUser.getAsset(BTC_ASSET_ID);
  System.out.println(asset);
  System.out.println("------------------------BTC------Information---------------------------");
  System.out.println("The BTC wallet address is " + asset.get("public_key").getAsString());
  System.out.println("The BTC wallet balance is " + asset.get("balance").getAsString());
  System.out.println("-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -");
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Get market price information for Ocean. One

How to check the price information of Ocean. One market? If you want to buy bitcoin and sell USDT, the base currency is USDT. If you want to buy USDT and sell Bitcoin, then the base currency is bitcoin.

if ( subinput.equals("1") ) {
  FetchOceanMarketInfos(BTC_ASSET_ID,USDT_ASSET_ID);
}
private static void FetchOceanMarketInfos(String targetAssetID, String baseAssetID) {
  OkHttpClient client = new OkHttpClient();
  String baseUrl = "https://events.ocean.one/markets/%s-%s/book ";
  String fullUrl = String.format(baseUrl,targetAssetID,baseAssetID);
  // String fullUrl = baseUrl + url;
  System.out.println(fullUrl);
  Request request = new Request.Builder()
                             .url(fullUrl)
                             .build();
  try {
     Response response = client.newCall(request).execute();
     if(! response.isSuccessful()) {throw new IOException("Unexpected code " + response);
     }
     String res = response.body().string();
     // System.out.println(res);
     JsonParser parser = new JsonParser();
     JsonElement jsonTree = parser.parse(res);
     JsonObject orders;
     orders =  jsonTree.getAsJsonObject();
     JsonArray asksOrders = orders.get("data").getAsJsonObject().
                                   get("data").getAsJsonObject().
                                   get("asks").getAsJsonArray();
     JsonArray bidsOrders = orders.get("data").getAsJsonObject().
                                   get("data").getAsJsonObject().
                                   get("bids").getAsJsonArray();
     // System.out.println(orders.get("data").getAsJsonObject().get("data").getAsJsonObject().get("bids").getAsJsonArray());
     System.out.println("--Side--Price--Amount--Funds---");
     asksOrders.forEach((element) ->  {
        JsonObject jsonObj = element.getAsJsonObject();
        System.out.println(jsonObj.get("side").getAsString() + "" +
                           jsonObj.get("price").getAsString() + "" +
                           jsonObj.get("amount").getAsString() + "" +
                           jsonObj.get("funds").getAsString() );
     });
     bidsOrders.forEach((element) ->  {
        JsonObject jsonObj = element.getAsJsonObject();
        System.out.println(jsonObj.get("side").getAsString() + "" +
                           jsonObj.get("price").getAsString() + "" +
                           jsonObj.get("amount").getAsString() + "" +
                           jsonObj.get("funds").getAsString() );
     });
     System.out.println("----endo--of--btc/usdt----");
     return;
   } catch(Exception e) { e.printStackTrace(); }
   return;
}
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Before trading, create a Memo!

In chapter 2, Java Bitcoin development tutorial based on Mixin Network: The robot accepts bitcoin and immediately returns it to the user. We learned how to transfer money. Here we explain how to tell Ocean.

• Side,”B” or “A”, “B” is buy,” A” is sell.
• AssetUUID UUID of the target virtual asset.
• Price is the Price of AssetUUID if the operation direction is “B”; If the direction of operation is “B”, the price is the price transferred to Ocean. One coin.

public static String GenerateOrderMemo(String Side, String AssetUUID, String Price) {
  try {
    MessageBufferPacker m = MessagePack.newDefaultBufferPacker();
    UUID myAssetUUID  =  UUID.fromString(AssetUUID);
    Value map = ValueFactory.newMap(ValueFactory.newString("S"), ValueFactory.newString(Side),
                                    ValueFactory.newString("A"), ValueFactory.newBinary(asBytes(myAssetUUID)),
                                    ValueFactory.newString("P"), ValueFactory.newString(Price),
                                    ValueFactory.newString("T"), ValueFactory.newString("L")); m.packValue(map);return Base64.getEncoder().encodeToString(m.toByteArray());
  } catch (Exception e) { e.printStackTrace(); }
    return "";
}
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The example of selling BTC

Transfer the BTC you want to sell to Ocean. One (OCEANONE_BOT) and put the UUID of the target virtual asset you want to trade back into the Memo.

private static final String OCEANONE_BOT     = "aaff5bef-42fb-4c9f-90e0-29f69176b7d4";
private static final String BTC_ASSET_ID     = "c6d0c728-2624-429b-8e0d-d9d19b6592fa";
private static final String EOS_ASSET_ID     = "6cfe566e-4aad-470b-8c9a-2fd35b49c68d";
private static final String USDT_ASSET_ID    = "815b0b1a-2764-3736-8faa-42d694fa620a";
private static final String BTC_WALLET_ADDR  = "14T129GTbXXPGXXvZzVaNLRFPeHXD1C25C";
private static final String MASTER_UUID      = "0b4f49dc-8fb4-4539-9a89-fb3afc613747";

if ( subinput.equals("s1") ) {
  System.out.print("Please input the BTC price base USDT: ");
  String pinput = System.console().readLine();
  System.out.println(pinput);

  System.out.print("Please input the BTC amount: ");
  String aminput = System.console().readLine();
  System.out.println(aminput);
  float amountf = Float.valueOf(aminput.trim()).floatValue();

  String buyMemo = GenerateOrderMemo("A",USDT_ASSET_ID,pinput);
  MixinAPI mixinApiUser = generateAPI_FromCSV();
  // UUID usdtUUID = UUID.fromString(USDT_ASSET_ID);
  // String memoTarget = encodeUUID(usdtUUID);
  System.out.println("------------------Ocean.one-USDT-BTC-EXCHANGE----------------------------");
  System.out.println(buyMemo);
  JsonObject asset = mixinApiUser.getAsset(BTC_ASSET_ID);
  System.out.println(asset);
  System.out.println(asset.get("balance").getAsFloat());
  if ( asset.get("balance").getAsFloat()  > 0 && asset.get("balance").getAsFloat() >= amountf ) {
      JsonObject transInfo = mixinApiUser.transfer(BTC_ASSET_ID, OCEANONE_BOT,
                                                 aminput,
                                                 buyMemo);
      System.out.println("------------------------BTC Transfer To EXCHANGE Information----------------------");
      System.out.println(transInfo);
      System.out.println("-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -");
   } else System.out.println("----------------Not enough BTC--------------------------------------------");
}
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If you want to buy BTC, do the following:

if ( subinput.equals("b1") ) {
  System.out.print("Please input the BTC price base USDT: ");
  String pinput = System.console().readLine();
  System.out.println(pinput);

  System.out.print("Please input the USDT amount: ");
  String aminput = System.console().readLine();
  System.out.println(aminput);
  float amountf = Float.valueOf(aminput.trim()).floatValue();
  String buyMemo = GenerateOrderMemo("B",BTC_ASSET_ID,pinput);
  MixinAPI mixinApiUser = generateAPI_FromCSV();
  // UUID usdtUUID = UUID.fromString(USDT_ASSET_ID);
  // String memoTarget = encodeUUID(usdtUUID);
  System.out.println("------------------Ocean.one-USDT-BTC-EXCHANGE----------------------------");
  System.out.println(buyMemo);
  JsonObject asset = mixinApiUser.getAsset(USDT_ASSET_ID);
  System.out.println(asset);
  System.out.println(asset.get("balance").getAsFloat());
  if ( asset.get("balance").getAsFloat()  >= 1 && asset.get("balance").getAsFloat() >= amountf ) {
      JsonObject transInfo = mixinApiUser.transfer(USDT_ASSET_ID, OCEANONE_BOT,
                                                 aminput,
                                                 buyMemo);
      System.out.println("------------------------BTC Transfer To EXCHANGE Information----------------------");
      System.out.println(transInfo);
      System.out.println("-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -");
   } else System.out.println("----------------Not enough USDT--------------------------------------------");
}
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A successful listing is as follows:

------------------Ocean.one--EXCHANGE----------------------------
hKFToUKhQcQQyUrIj0ZxOXa2CgkGTxgR6KFQojExoVShTA==
{"type":"asset"."asset_id":"815b0b1a-2764-3736-8faa-42d694fa620a"."chain_id":"c6d0c728-2624-429b-8e0d-d9d19b6592fa"."symbol":"USDT"."name":"Tether USD"."icon_url":"https://images.mixin.one/ndNBEpObYs7450U08oAOMnSEPzN66SL8Mh-f2pPWBDeWaKbXTPUIdrZph7yj8Z93Rl8uZ16m7Qjz-E-9JFKSsJ-F=s128"."balance":"2"."public_key":"15RNBb5GzoXWRoEMT5MJL3pqzSjdPoXf6J"."account_name":""."account_tag":""."price_btc":"0.00018747"."price_usd":"0.98731224"."change_btc":"0.021985715750932774"."change_usd":"0.01843154053058167"."asset_key":"815b0b1a-2764-3736-8faa-42d694fa620a"."confirmations": 6,"capitalization": 0} 2.0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- 815 b0b1a - 2764-3736-8 faa - 42 d694fa620a Transfer To EXCHANGE Information -- -- -- -- -- -- -- -- -- {"type":"transfer"."snapshot_id":"f526fd18-c3d2-4a6d-a0f0-3a720e93c48e"."opponent_id":"aaff5bef-42fb-4c9f-90e0-29f69176b7d4"."asset_id":"815b0b1a-2764-3736-8faa-42d694fa620a"."amount":"- 2"."trace_id":"6cf37ca6-4efa-4e78-bea1-53c5c5d54d2b"."memo":"hKFToUKhQcQQyUrIj0ZxOXa2CgkGTxgR6KFQojExoVShTA=="."created_at":"The 2019-04-26 T01:56:00. 803572612 z"."counter_user_id":"0b4f49dc-8fb4-4539-9a89-fb3afc613747"}
---Order is 6cf37ca6-4efa-4e78-bea1-53c5c5d54d2b: ------
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Cancel the deity

Ocean. One takes trace_id as an order, for example in the example above, 6CF37CA6-4EFA-4E78-BEA1-53C5C5D54D2b is the order number and we use it to cancel the order.

public static String GenerateOrderCancelMemo(String myUuid) {
  try {
    MessageBufferPacker m = MessagePack.newDefaultBufferPacker();
    UUID AssetUUID  =  UUID.fromString(myUuid);
    Value map = ValueFactory.newMap(
                                    ValueFactory.newString("O"), ValueFactory.newBinary(asBytes(AssetUUID)) );
    m.packValue(map);
    return Base64.getEncoder().encodeToString(m.toByteArray());
  } catch (Exception e) { e.printStackTrace(); }
    return "";
}
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By reading the balance of assets, to confirm the arrival of the account

Check the wallet’s balance.

MixinAPI mixinApiUser = generateAPI_FromCSV();
JsonObject asset = mixinApiUser.getAsset(BTC_ASSET_ID);
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Source code execution

Compile and execute, then start trading.

• Gradle Build builds projects.
• Java-cp runs the project.

java -cp .:build/libs/bitcoin_wallet-java.jar:libs/* bitcoin_wallet.java.App
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Note: It cannot be run using Gradle run because the system.console ().readline () we use is not supported by Gradle and can only be run using Java -cp!

List of commands when this code is executed:

• 1: Create Bitcoin Wallet and update PIN
• 2: Read Bitcoin balance & address
• 3: Read USDT balance & address
• 4: Read EOS balance & address
• tbb:Transfer BTC from Bot to Wallet
• tbm:Transfer BTC from Wallet to Master
• teb:Transfer EOS from Bot to Wallet
• tem:Transfer EOS from Wallet to Master
• tub:Transfer USDT from Bot to Wallet
• tum:Transfer USDT from Wallet to Master
• 5: pay 0.0001 BTC buy USDT
• 6: pay $1 USDT buy BTC
• 7: Read Snapshots
• 8: Fetch market price(USDT)
• 9: Fetch market price(BTC)
• v: Verify Wallet Pin
• wb: Withdraw BTC
• we: WitchDraw EOS
• a: Read All Assets Infos
• o: Ocean.One Exchange
• q: Exit

Make your choose(eg: q for Exit!) :

• 1: Orders-Book of BTC/USDT
• b1: Buy BTC pay USDT
• s1: Sell BTC get USDT
• 2: Orders-Book of EOS/USDT
• b2: Buy EOS pay USDT
• s2: Sell EOS get USDT
• 3: Orders-Book of XIN/USDT
• b3: Buy XIN pay USDT
• s3: Sell XIN get USDT
• 4: Orders-Book of XIN/BTC
• b4: Buy XIN pay BTC
• s4: Sell XIN get BTC
• 5: Orders-Book of EOS/BTC
• b4: Buy EOS pay BTC
• s4: Sell EOS get BTC
• 6: Orders-Book of SC/BTC
• b6: Buy SC pay BTC
• s6: Sell SC get BTC
• 7: Orders-Book of EOS/XIN
• b7: Buy EOS pay XIN
• s7: Sell EOS get XIN
• 8: Orders-Book of ETH/XIN
• b8: Buy ETH pay XIN
• s8: Sell EOS get XIN
• 9: Orders-Book of SC/XIN
• b9: Buy SC pay XIN
• s9: Sell SC get XIN
• c: Cancel the order
• q: Exit

The complete code