摘要：比特幣的到帳時間是個區塊的高度，約分鐘。請注意，比特幣與的地址是一樣的。

Exincore 提供了基于Mixin Network的幣幣交易API.

你可以支付USDT給ExinCore, ExinCore會以最低的價格，最優惠的交易費將你購買的比特幣轉給你, 每一幣交易都是匿名的，并且可以在區塊鏈上進行驗證，交易的細節只有你與ExinCore知道！

ExinCore 也不知道你是誰，它只知道你的UUID.

你先需要創建一個機器人, 方法在 教程一.

正如教程一里我們介紹過的， 我們需要依賴 mixin-sdk-php, 你應該先安裝過它了， 這兒我們再安裝 uuid, msgpack 兩個軟件包.

  composer require ramsey/uuid
  composer require rybakit/msgpack

ExinCore可以進行BTC, USDT, EOS, ETH 等等交易， 這兒演示如果用 USDT購買BTC 或者 用BTC購買USDT, 交易前，先檢查一下錢包地址！
完整的步驟如下:

檢查比特幣或USDT的余額，錢包地址。并記下錢包地址。

從第三方交易所或者你的冷錢包中，將幣充到上述錢包地址。

再檢查一下幣的余額，看到帳與否。(比特幣的到帳時間是5個區塊的高度，約100分鐘)。

請注意，比特幣與USDT的地址是一樣的。

if ($line == "2") {
  if (($handle = fopen("new_users.csv", "r")) !== FALSE) {
  while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
    $mixinSdk_eachAccountInstance = new MixinSDK(GenerateConfigByCSV($data));
    $asset_info = $mixinSdk_eachAccountInstance->Wallet()->readAsset(BTC_ASSET_ID);
    print_r("Bitcoin wallet address is :".$asset_info["public_key"]."
");
    print_r("Bitcoin wallet balance is :".$asset_info["balance"]."
");
  }
    fclose($handle);
  } else print("Create user first
");
}
if ($line == "3") {
  if (($handle = fopen("new_users.csv", "r")) !== FALSE) {
  while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
    $mixinSdk_eachAccountInstance = new MixinSDK(GenerateConfigByCSV($data));
    $asset_info = $mixinSdk_eachAccountInstance->Wallet()->readAsset(USDT_ASSET_ID);
    print_r("USDT wallet address is :".$asset_info["public_key"]."
");
    print_r("USDT wallet balance is :".$asset_info["balance"]."
");
  }
    fclose($handle);
  } else print("Create user first
");
}

如果來查詢ExinCore市場的價格信息呢？你要先了解你交易的基礎幣是什么，如果你想買比特幣，賣出USDT,那么基礎貨幣就是USDT;如果你想買USDT,賣出比特幣，那么基礎貨幣就是比特幣.

function getExchangeCoins($base_coin) :string {
  $client = new GuzzleHttpClient();
  $res = $client->request("GET", "https://exinone.com/exincore/markets?base_asset=".$base_coin, [
      ]);
  $result = "";
  if ($res->getStatusCode() == "200") {
    // echo $res->getStatusCode() . PHP_EOL;
    $resInfo = json_decode($res->getBody(), true);
    echo "Asset ID | Asset Symbol | Price | Amount | Exchanges" . PHP_EOL;
    $result = "Asset ID | Asset Symbol | Price | Amount | Exchanges" . PHP_EOL;
    foreach ($resInfo["data"] as $key => $coinInfo) {
      echo ($coinInfo["exchange_asset"] ." ".$coinInfo["exchange_asset_symbol"]. "/". $coinInfo["base_asset_symbol"] .
            " ". $coinInfo["price"] ." ". $coinInfo["minimum_amount"] ."-". $coinInfo["maximum_amount"] . " ");
      $result .= $coinInfo["exchange_asset_symbol"]. "/". $coinInfo["base_asset_symbol"] .
                  " ". $coinInfo["price"] ." ". $coinInfo["minimum_amount"] ."-". $coinInfo["maximum_amount"] . " ";
      foreach ($coinInfo["exchanges"] as $key => $exchange) {
        echo $exchange . " ";
        $result .= $exchange . " ";
      }
      echo PHP_EOL;
      $result .= PHP_EOL;
    }
  }
  return $result;
}

在第二章里,基于Mixin Network的PHP比特幣開發教程: 機器人接受比特幣并立即退還用戶, 我們學習過退還用戶比特幣，在這里，我們除了給ExinCore支付幣外，還要告訴他我們想購買的幣是什么，即將想購買的幣存到memo里。

$memo = base64_encode(MessagePack::pack([
                     "A" => Uuid::fromString($_targetAssetID)->getBytes(),
                     ]));

轉幣給ExinCore時，將memo寫入你希望購買的幣，否則，ExinCore會直接退幣給你！

const EXIN_BOT        = "61103d28-3ac2-44a2-ae34-bd956070dab1";
const BTC_ASSET_ID    = "c6d0c728-2624-429b-8e0d-d9d19b6592fa";
const EOS_ASSET_ID    = "6cfe566e-4aad-470b-8c9a-2fd35b49c68d";
const USDT_ASSET_ID   = "815b0b1a-2764-3736-8faa-42d694fa620a";
coinExchange(BTC_ASSET_ID,"0.0001",USDT_ASSET_ID);

//...........

function coinExchange($_assetID,$_amount,$_targetAssetID) {
  $mixinSdk = new MixinSDK(require "./config.php");
  // print_r();
  $memo = base64_encode(MessagePack::pack([
                       "A" => Uuid::fromString($_targetAssetID)->getBytes(),
                       ]));
  $BotInfo = $mixinSdk->Wallet()->transfer($_assetID,EXIN_BOT,
                                           $mixinSdk->getConfig()["default"]["pin"],$_amount,$memo);
  print_r($BotInfo);
}

如果你想賣出比特幣買入USDT,調用方式如下：

coinExchange($config,BTC_ASSET_ID,"0.0001",USDT_ASSET_ID);

如果你想賣出USDT買入比特幣,調用方式如下：

coinExchange($config,USDT_ASSET_ID,"1",BTC_ASSET_ID);

交易完成后，Exincore會將你需要的幣轉到你的帳上，同樣，會在memo里，記錄成交價格，交易費用等信息！你只需要按下面的方式解開即可！

readUserSnapshots 讀取錢包的交易記錄。

$limit        = 20;
$offset       = "2019-03-10T01:58:25.362528Z";
$snapInfo = $mixinSdk_BotInstance->Wallet()->readUserSnapshots($limit, $offset);
// print_r($networkInfo2);
foreach ($snapInfo as  $record) {
  // echo $key . PHP_EOL;
  // print_r($record);
  if ($record["amount"] > 0 and $record["memo"] != "") {
    echo "------------MEMO:-coin--exchange--------------" . PHP_EOL;
    echo "memo: " . $record["memo"] . PHP_EOL;
    // print_r($dtPay->memo);
    echo "You Get Coins: ". $record["asset_id"]. " " . $record["amount"] . PHP_EOL;
    $memoUnpack = MessagePack::unpack(base64_decode($record["memo"]));
    $feeAssetID = Uuid::fromBytes($memoUnpack["FA"])->toString();
    $OrderID    = Uuid::fromBytes($memoUnpack["O"])->toString();
    if ($memoUnpack["C"] == 1000) {
      echo "Successful Exchange:". PHP_EOL;
      echo "Fee asset ID: " . $feeAssetID . " fee is :" . $memoUnpack["F"] . PHP_EOL;
      echo "Order ID: " . $OrderID . " Price is :" . $memoUnpack["P"] . PHP_EOL;
    } else print_r($memoUnpack);
    echo "--------------memo-record end---------------" . PHP_EOL;
  }
}

一次成功的交易如下：

------------MEMO:-coin--exchange--------------
memo: hqFDzQPooVCnMzg3Mi45N6FGqTAuMDAwNzc0NqJGQcQQgVsLGidkNzaPqkLWlPpiCqFUoUahT8QQIbfeL6p5RVOcEP0mLb+t+g==
You Get Coins: 815b0b1a-2764-3736-8faa-42d694fa620a 0.3857508
Successful Exchange:
Fee asset ID: 815b0b1a-2764-3736-8faa-42d694fa620a fee is :0.0007746
Order ID: 21b7de2f-aa79-4553-9c10-fd262dbfadfa Price is :3872.97
--------------memo-record end---------------

通過讀取幣的余額，來確認交易情況！

$mixinSdk = new MixinSDK(require "./config.php");
$asset_info = $mixinSdk->Wallet()->readAsset(USDT_ASSET_ID);
print_r("USDT wallet balance is :".$asset_info["balance"]."
");

執行 php call_apis.php 即可開始交易了.

1: Create user and update PIN

2: Read Bitcoin balance & address

3: Read USDT balance & address

4: Read EOS balance

5: Read EOS address

6: Transfer Bitcoin from bot to new user

7: Transfer Bitcoin from new user to Master

8: Withdraw bot"s Bitcoin

9: Withdraw bot"s EOS

qu: Read market price(USDT)

qb: Read market price(BTC)

b: Balance of bot (USDT & BTC)

s: Read Snapshots

tb: Transfer 0.0001 BTC buy USDT

tu: Transfer $1 USDT buy BTC

q: Exit

完整代碼