diff --git a/src/js/apis/binance/BinanceApiClient.js b/src/js/apis/binance/BinanceApiClient.js
index 7a386d3..3821988 100644
--- a/src/js/apis/binance/BinanceApiClient.js
+++ b/src/js/apis/binance/BinanceApiClient.js
@@ -16,6 +16,7 @@ import Transaction from "../../apiwrapper/transaction/Transaction.js";
 import TransactionUpdateEvent from "../../apiwrapper/event/TransactionUpdateEvent.js";
 import TransactionFill from "../../apiwrapper/transaction/TransactionFill.js";
 import TransactionStatus from "../../apiwrapper/transaction/TransactionStatus.js";
+import TransactionPhase from "../../apiwrapper/transaction/TransactionPhase.js";
 
 export default class BinanceApiClient extends APIClient {
     /**
@@ -266,6 +267,7 @@ export default class BinanceApiClient extends APIClient {
             "timestamp": Date.now()
         }).then(resp => {
             transaction.buySettings.apiID = resp.orderId;
+            transaction.phase = TransactionPhase.BUY_IN_PROGRESS;
         }).catch(e => {
             this.getLogger().error("Unable to create buy order for " + transaction.id, {code: e.code, msg: e.message, url: e.requestUrl});
             const event = new TransactionUpdateEvent(transaction.id, transaction.buySettings.apiID, TransactionStatus.CANCELED)
@@ -288,6 +290,7 @@ export default class BinanceApiClient extends APIClient {
             "timestamp": Date.now()
         }).then(resp => {
             transaction.sellSettings.apiID = resp.orderId;
+            transaction.phase = TransactionPhase.SELL_IN_PROGRESS;
         }).catch(e => {
             this.getLogger().error("Unable to create sell order for " + transaction.id, {code: e.code, msg: e.message, url: e.requestUrl});
             const event = new TransactionUpdateEvent(transaction.id, transaction.sellSettings.apiID, TransactionStatus.CANCELED)
diff --git a/src/js/apiwrapper/transaction/Transaction.js b/src/js/apiwrapper/transaction/Transaction.js
index 5d78eb2..1d957ca 100644
--- a/src/js/apiwrapper/transaction/Transaction.js
+++ b/src/js/apiwrapper/transaction/Transaction.js
@@ -45,6 +45,10 @@ export default class Transaction extends Serializable {
      */
     timestamp = 0;
 
+    /**
+     * @param {string} initiator 
+     * @param {TradingPair} tradingPair 
+     */
     constructor(initiator, tradingPair){
         super();
         this.initiator = initiator;
diff --git a/src/js/tradingbot/TradingBot.js b/src/js/tradingbot/TradingBot.js
index ba3e8a7..ef67dfc 100644
--- a/src/js/tradingbot/TradingBot.js
+++ b/src/js/tradingbot/TradingBot.js
@@ -123,7 +123,7 @@ export default class TradingBot {
         this.#loadWorker();
         this.#worker.forEach(worker => {
             this.#registerTradingPair(worker.getTradingPair());
-            worker.init(this.#logger, this.#config.getDataDirectory());
+            worker.init(this.#logger, this.#config.getDataDirectory(), this);
         });
         this.#transactions.forEach(transaction => {
             const type = transaction.phase === (TransactionPhase.INITIAL || transaction.phase === TransactionPhase.BUY_IN_PROGRESS) ? "buy" : "sell";
@@ -235,6 +235,7 @@ export default class TradingBot {
     handleAccountUpdate(accountUpdateEvent) {
         switch (accountUpdateEvent.eventType) {
             case APIEventType.BALANCE_CHANGE:
+                this.#logger.info("Balance update: ", accountUpdateEvent);
                 // TODO update changed balances
                 break;
             case APIEventType.TRANSACTION_UPDATE:
@@ -337,6 +338,41 @@ export default class TradingBot {
 
     }
 
+    /**
+     * @param {AbstractWorker} worker 
+     * @param {number} quantity 
+     * @param {number} price 
+     */
+    requestBuy(worker, quantity, price){
+        if(this.#config.getUsdTradeLimit() / this.#config.getPerTradeLimit() >= this.#transactions.length){
+            return;
+        }
+
+        const transaction = new Transaction(worker.getId(), worker.getTradingPair());
+        transaction.buySettings.oderPrice = price;
+        transaction.buySettings.orderQuantity = Math.round(this.#config.getPerTradeLimit() / price);
+        this.#transactions.push(transaction);
+        this.#saveTransactions();
+
+        this.#api.requestBuy(transaction);
+    }
+
+    /**
+     * @param {AbstractWorker} worker 
+     * @param {Transaction} transaction 
+     */
+    requestSell(worker, transaction){
+        this.#api.requestSell(transaction);
+    }
+
+    /**
+     * @param {AbstractWorker} worker 
+     * @param {Transaction} transaction 
+     */
+    requestCancle(worker, transaction){
+        // not implemented as this class is only an interface!
+    }
+
     #loadTransactions() {
         try {
             this.#transactions = SerializableHelper.load(this.#config.getDataDirectory(), 'transactions.sjson', Transaction);
@@ -351,7 +387,7 @@ export default class TradingBot {
         }
     }
 
-    #saveTransactions() {
+    async #saveTransactions() {
         SerializableHelper.save(this.#config.getDataDirectory(), 'transactions.sjson', this.#transactions);
         SerializableHelper.save(this.#config.getDataDirectory(), 'transactionHistory.sjson', this.#transactionHistory);
     }
@@ -366,7 +402,7 @@ export default class TradingBot {
         }
     }
 
-    #saveWorker() {
+    async #saveWorker() {
         const workerArr = [];
         Array.from(this.#worker.values()).forEach(w => workerArr.push(w));
         SerializableHelper.save(this.#config.getDataDirectory(), 'worker.sjson', workerArr);
diff --git a/src/js/tradingbot/worker/AbstractWorker.js b/src/js/tradingbot/worker/AbstractWorker.js
index 0219674..3766d07 100644
--- a/src/js/tradingbot/worker/AbstractWorker.js
+++ b/src/js/tradingbot/worker/AbstractWorker.js
@@ -5,6 +5,7 @@ import Serializable from "../../util/Serializable.js";
 import SerializableHelper from "../../util/SerializableHelper.js";
 import AssetData from "../data/asset/AssetData.js";
 import AbstractStrategy from "../strategy/AbstractStrategy.js";
+import WorkerTradingApiProvider from "./WorkerTradingApiProvider.js";
 
 export default class AbstractWorker extends Serializable {
 
@@ -28,6 +29,11 @@ export default class AbstractWorker extends Serializable {
      */
     #strategy = null;
 
+    /**
+     * @type {WorkerTradingApiProvider}
+     */
+    #apiProvider = null
+
     /**
      * @type {Logger}
      */
@@ -49,9 +55,11 @@ export default class AbstractWorker extends Serializable {
     /**
      * @param {Logger} logger 
      * @param {string} dataPath 
+     * @param {WorkerTradingApiProvider} apiProvider
      */
-    init(logger, dataPath){
+    init(logger, dataPath, apiProvider){
         this.#logger = logger;
+        this.#apiProvider = apiProvider;
         if(this.#strategy != null){
             this.#strategy.init(logger);
         }
@@ -114,6 +122,13 @@ export default class AbstractWorker extends Serializable {
         return this.#logger;
     }
 
+    /**
+     * @returns {WorkerTradingApiProvider}
+     */
+    getApiProvider(){
+        return this.#apiProvider;
+    }
+
     /**
      * @param {string} dataPath path to data directory
      */
diff --git a/src/js/tradingbot/worker/DefaultWorker.js b/src/js/tradingbot/worker/DefaultWorker.js
index db45817..d66b329 100644
--- a/src/js/tradingbot/worker/DefaultWorker.js
+++ b/src/js/tradingbot/worker/DefaultWorker.js
@@ -28,16 +28,17 @@ export default class DefaultWorker extends AbstractWorker{
      */
     onUpdate(assetData, transactions){
         this.getStrategy().updateAssetData(assetData);
+        const price = this.getStrategy().getAssetData().getOrderBook().getBestBid().price;
 
         if(this.getStrategy().shouldBuy()){
-            // TODO create transaction!
+            this.getApiProvider().requestBuy(this, Math.round(50 / price), price);
         }
 
         for(let transaction of transactions){
             if(transaction.phase == TransactionPhase.BUY_DONE && this.getStrategy().shouldSell(transaction)){
-                // TODO request sell!
+                this.getApiProvider().requestSell(this, transaction);
             } else if(this.getStrategy().shouldCancle()){
-                // TODO request cancle
+                this.getApiProvider().requestCancle(this, transaction);
             }
         }
     }
diff --git a/src/js/tradingbot/worker/WorkerTradingApiProvider.js b/src/js/tradingbot/worker/WorkerTradingApiProvider.js
new file mode 100644
index 0000000..849d525
--- /dev/null
+++ b/src/js/tradingbot/worker/WorkerTradingApiProvider.js
@@ -0,0 +1,29 @@
+import Transaction from "../../apiwrapper/transaction/Transaction.js";
+import AbstractWorker from "./AbstractWorker.js";
+
+export default class WorkerTradingApiProvider {
+    /**
+     * @param {AbstractWorker} worker 
+     * @param {number} quantity 
+     * @param {number} price 
+     */
+    requestBuy(worker, quantity, price){
+        // not implemented as this class is only an interface!
+    }
+
+    /**
+     * @param {AbstractWorker} worker 
+     * @param {Transaction} transaction 
+     */
+    requestSell(worker, transaction){
+        // not implemented as this class is only an interface!
+    }
+
+    /**
+     * @param {AbstractWorker} worker 
+     * @param {Transaction} transaction 
+     */
+    requestCancle(worker, transaction){
+        // not implemented as this class is only an interface!
+    }
+}
\ No newline at end of file