diff --git a/src/wallet/CMakeLists.txt b/src/wallet/CMakeLists.txt
index 0b8fe4cb1..086758c39 100644
--- a/src/wallet/CMakeLists.txt
+++ b/src/wallet/CMakeLists.txt
@@ -75,13 +75,26 @@ target_link_libraries(wallet
     ${Boost_REGEX_LIBRARY}
     ${EXTRA_LIBRARIES})
 
+    
+# in case of static build, randon.c.obj from UNBOUND_LIBARY conflicts with the same file from 'crypto'
+# and in case of dynamic build, merge_static_libs called with ${UNBOUND_LIBRARY} will fail
+if (STATIC) 
+    set(libs_to_merge wallet cryptonote_core mnemonics common crypto) 
+    # hack - repack libunbound into another static lib - there's conflicting object file "random.c.obj"
+    merge_static_libs(wallet_merged "${libs_to_merge}")
+    merge_static_libs(wallet_merged2 "${UNBOUND_LIBRARY}")
+    install(TARGETS wallet_merged wallet_merged2
+        ARCHIVE DESTINATION lib)
+else (STATIC)
+    set(libs_to_merge wallet cryptonote_core mnemonics common crypto ${UNBOUND_LIBRARY} ) 
+    merge_static_libs(wallet_merged "${libs_to_merge}")
+    install(TARGETS wallet_merged
+        ARCHIVE DESTINATION lib)
+endif (STATIC)
 
-set(libs_to_merge wallet cryptonote_core mnemonics common crypto)
 #MERGE_STATIC_LIBS(wallet_merged wallet_merged "${libs_to_merge}")
-merge_static_libs(wallet_merged "${libs_to_merge}")
 
-install(TARGETS wallet_merged
-    ARCHIVE DESTINATION lib)
+
 
 install(FILES ${wallet_api_headers}
     DESTINATION include/wallet)
diff --git a/src/wallet/api/wallet.cpp b/src/wallet/api/wallet.cpp
index be379cb99..67d2ebecb 100644
--- a/src/wallet/api/wallet.cpp
+++ b/src/wallet/api/wallet.cpp
@@ -46,6 +46,7 @@ namespace Bitmonero {
 namespace {
     // copy-pasted from simplewallet
     static const size_t DEFAULT_MIXIN = 4;
+    static const int    DEFAULT_REFRESH_INTERVAL_SECONDS = 10;
 }
 
 struct Wallet2CallbackImpl : public tools::i_wallet2_callback
@@ -89,6 +90,7 @@ struct Wallet2CallbackImpl : public tools::i_wallet2_callback
                      << ", amount: " << print_money(amount));
         if (m_listener) {
             m_listener->moneyReceived(tx_hash, amount);
+            m_listener->updated();
         }
     }
 
@@ -103,6 +105,7 @@ struct Wallet2CallbackImpl : public tools::i_wallet2_callback
                      << ", amount: " << print_money(amount));
         if (m_listener) {
             m_listener->moneySpent(tx_hash, amount);
+            m_listener->updated();
         }
     }
 
@@ -118,6 +121,7 @@ Wallet::~Wallet() {}
 
 WalletListener::~WalletListener() {}
 
+
 string Wallet::displayAmount(uint64_t amount)
 {
     return cryptonote::print_money(amount);
@@ -144,6 +148,12 @@ std::string Wallet::genPaymentId()
 
 }
 
+bool Wallet::paymentIdValid(const string &paiment_id)
+{
+    crypto::hash8 pid;
+    return tools::wallet2::parse_short_payment_id(paiment_id, pid);
+}
+
 
 ///////////////////////// WalletImpl implementation ////////////////////////
 WalletImpl::WalletImpl(bool testnet)
@@ -153,13 +163,22 @@ WalletImpl::WalletImpl(bool testnet)
     m_wallet = new tools::wallet2(testnet);
     m_history = new TransactionHistoryImpl(this);
     m_wallet2Callback = new Wallet2CallbackImpl;
+    m_wallet->callback(m_wallet2Callback);
+    m_refreshThreadDone = false;
+    m_refreshEnabled = false;
+    m_refreshIntervalSeconds = DEFAULT_REFRESH_INTERVAL_SECONDS;
+    m_refreshThread = std::thread([this] () {
+        this->refreshThreadFunc();
+    });
+
 }
 
 WalletImpl::~WalletImpl()
 {
-    delete m_wallet2Callback;
+    stopRefresh();
     delete m_history;
     delete m_wallet;
+    delete m_wallet2Callback;
 }
 
 bool WalletImpl::create(const std::string &path, const std::string &password, const std::string &language)
@@ -251,8 +270,12 @@ bool WalletImpl::close()
     clearStatus();
     bool result = false;
     try {
+        // LOG_PRINT_L0("Calling wallet::store...");
         m_wallet->store();
+        // LOG_PRINT_L0("wallet::store done");
+        // LOG_PRINT_L0("Calling wallet::stop...");
         m_wallet->stop();
+        // LOG_PRINT_L0("wallet::stop done");
         result = true;
     } catch (const std::exception &e) {
         m_status = Status_Error;
@@ -348,21 +371,30 @@ string WalletImpl::keysFilename() const
 bool WalletImpl::init(const std::string &daemon_address, uint64_t upper_transaction_size_limit)
 {
     clearStatus();
-    try {
-        m_wallet->init(daemon_address, upper_transaction_size_limit);
-        if (Utils::isAddressLocal(daemon_address)) {
-            this->setTrustedDaemon(true);
-        }
 
-    } catch (const std::exception &e) {
-        LOG_ERROR("Error initializing wallet: " << e.what());
-        m_status = Status_Error;
-        m_errorString = e.what();
+    m_wallet->init(daemon_address, upper_transaction_size_limit);
+    if (Utils::isAddressLocal(daemon_address)) {
+        this->setTrustedDaemon(true);
     }
+    bool result = this->refresh();
+    // enabling background refresh thread
+    startRefresh();
+    return result;
 
-    return m_status == Status_Ok;
 }
 
+void WalletImpl::initAsync(const string &daemon_address, uint64_t upper_transaction_size_limit)
+{
+    clearStatus();
+    m_wallet->init(daemon_address, upper_transaction_size_limit);
+    if (Utils::isAddressLocal(daemon_address)) {
+        this->setTrustedDaemon(true);
+    }
+    startRefresh();
+}
+
+
+
 uint64_t WalletImpl::balance() const
 {
     return m_wallet->balance();
@@ -377,15 +409,17 @@ uint64_t WalletImpl::unlockedBalance() const
 bool WalletImpl::refresh()
 {
     clearStatus();
-    try {
-        m_wallet->refresh();
-    } catch (const std::exception &e) {
-        m_status = Status_Error;
-        m_errorString = e.what();
-    }
+    doRefresh();
     return m_status == Status_Ok;
 }
 
+void WalletImpl::refreshAsync()
+{
+    LOG_PRINT_L3(__FUNCTION__ << ": Refreshing asyncronously..");
+    clearStatus();
+    m_refreshCV.notify_one();
+}
+
 // TODO:
 // 1 - properly handle payment id (add another menthod with explicit 'payment_id' param)
 // 2 - check / design how "Transaction" can be single interface
@@ -396,7 +430,9 @@ bool WalletImpl::refresh()
 //    - unconfirmed_transfer_details;
 //    - confirmed_transfer_details)
 
-PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const string &payment_id, uint64_t amount, uint32_t mixin_count)
+PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const string &payment_id, uint64_t amount, uint32_t mixin_count,
+                                                  PendingTransaction::Priority priority)
+
 {
     clearStatus();
     vector<cryptonote::tx_destination_entry> dsts;
@@ -458,8 +494,10 @@ PendingTransaction *WalletImpl::createTransaction(const string &dst_addr, const
         //std::vector<tools::wallet2::pending_tx> ptx_vector;
 
         try {
+            // priority called "fee_multiplied in terms of underlying wallet interface
             transaction->m_pending_tx = m_wallet->create_transactions_2(dsts, fake_outs_count, 0 /* unlock_time */,
-                                                                      0 /* unused fee arg*/, extra, m_trustedDaemon);
+                                                                      static_cast<uint64_t>(priority),
+                                                                      extra, m_trustedDaemon);
 
         } catch (const tools::error::daemon_busy&) {
             // TODO: make it translatable with "tr"?
@@ -564,10 +602,17 @@ bool WalletImpl::connectToDaemon()
     m_status = result ? Status_Ok : Status_Error;
     if (!result) {
         m_errorString = "Error connecting to daemon at " + m_wallet->get_daemon_address();
+    } else {
+        // start refreshing here
     }
     return result;
 }
 
+bool WalletImpl::connected() const
+{
+    return m_wallet->check_connection();
+}
+
 void WalletImpl::setTrustedDaemon(bool arg)
 {
     m_trustedDaemon = arg;
@@ -584,5 +629,70 @@ void WalletImpl::clearStatus()
     m_errorString.clear();
 }
 
+void WalletImpl::refreshThreadFunc()
+{
+    LOG_PRINT_L3(__FUNCTION__ << ": starting refresh thread");
+
+    while (true) {
+        std::unique_lock<std::mutex> lock(m_refreshMutex);
+        if (m_refreshThreadDone) {
+            break;
+        }
+        LOG_PRINT_L3(__FUNCTION__ << ": waiting for refresh...");
+        m_refreshCV.wait_for(lock, std::chrono::seconds(m_refreshIntervalSeconds));
+        LOG_PRINT_L3(__FUNCTION__ << ": refresh lock acquired...");
+        LOG_PRINT_L3(__FUNCTION__ << ": m_refreshEnabled: " << m_refreshEnabled);
+        LOG_PRINT_L3(__FUNCTION__ << ": m_status: " << m_status);
+        if (m_refreshEnabled /*&& m_status == Status_Ok*/) {
+            LOG_PRINT_L3(__FUNCTION__ << ": refreshing...");
+            doRefresh();
+        }
+    }
+    LOG_PRINT_L3(__FUNCTION__ << ": refresh thread stopped");
+}
+
+void WalletImpl::doRefresh()
+{
+    // synchronizing async and sync refresh calls
+    std::lock_guard<std::mutex> guarg(m_refreshMutex2);
+    try {
+        m_wallet->refresh();
+    } catch (const std::exception &e) {
+        m_status = Status_Error;
+        m_errorString = e.what();
+    }
+    if (m_wallet2Callback->getListener()) {
+        m_wallet2Callback->getListener()->refreshed();
+    }
+}
+
+
+void WalletImpl::startRefresh()
+{
+    if (!m_refreshEnabled) {
+        m_refreshEnabled = true;
+        m_refreshCV.notify_one();
+    }
+}
+
+
+
+void WalletImpl::stopRefresh()
+{
+    if (!m_refreshThreadDone) {
+        m_refreshEnabled = false;
+        m_refreshThreadDone = true;
+        m_refreshThread.join();
+    }
+}
+
+void WalletImpl::pauseRefresh()
+{
+    // TODO synchronize access
+    if (!m_refreshThreadDone) {
+        m_refreshEnabled = false;
+    }
+}
+
 
 } // namespace
diff --git a/src/wallet/api/wallet.h b/src/wallet/api/wallet.h
index 164aede1a..9a290e0bc 100644
--- a/src/wallet/api/wallet.h
+++ b/src/wallet/api/wallet.h
@@ -35,6 +35,9 @@
 #include "wallet/wallet2.h"
 
 #include <string>
+#include <thread>
+#include <mutex>
+#include <condition_variable>
 
 
 namespace Bitmonero {
@@ -65,14 +68,19 @@ public:
     std::string filename() const;
     std::string keysFilename() const;
     bool init(const std::string &daemon_address, uint64_t upper_transaction_size_limit);
+    void initAsync(const std::string &daemon_address, uint64_t upper_transaction_size_limit);
     bool connectToDaemon();
+    bool connected() const;
     void setTrustedDaemon(bool arg);
     bool trustedDaemon() const;
     uint64_t balance() const;
     uint64_t unlockedBalance() const;
     bool refresh();
+    void refreshAsync();
     PendingTransaction * createTransaction(const std::string &dst_addr, const std::string &payment_id,
-                                           uint64_t amount, uint32_t mixin_count);
+                                        uint64_t amount, uint32_t mixin_count,
+                                        PendingTransaction::Priority priority = PendingTransaction::Priority_Low);
+
     virtual void disposeTransaction(PendingTransaction * t);
     virtual TransactionHistory * history() const;
     virtual void setListener(WalletListener * l);
@@ -81,19 +89,37 @@ public:
 
 private:
     void clearStatus();
+    void refreshThreadFunc();
+    void doRefresh();
+    void startRefresh();
+    void stopRefresh();
+    void pauseRefresh();
 
 private:
     friend class PendingTransactionImpl;
     friend class TransactionHistoryImpl;
 
     tools::wallet2 * m_wallet;
-    int  m_status;
+    std::atomic<int>  m_status;
     std::string m_errorString;
     std::string m_password;
     TransactionHistoryImpl * m_history;
     bool        m_trustedDaemon;
     WalletListener * m_walletListener;
     Wallet2CallbackImpl * m_wallet2Callback;
+
+    // multi-threaded refresh stuff
+    std::atomic<bool> m_refreshEnabled;
+    std::atomic<bool> m_refreshThreadDone;
+    std::atomic<int>  m_refreshIntervalSeconds;
+    // synchronizing  refresh loop;
+    std::mutex        m_refreshMutex;
+
+    // synchronizing  sync and async refresh
+    std::mutex        m_refreshMutex2;
+    std::condition_variable m_refreshCV;
+    std::thread       m_refreshThread;
+
 };
 
 
diff --git a/src/wallet/api/wallet_manager.cpp b/src/wallet/api/wallet_manager.cpp
index bf072ccca..ca83806ff 100644
--- a/src/wallet/api/wallet_manager.cpp
+++ b/src/wallet/api/wallet_manager.cpp
@@ -137,6 +137,11 @@ WalletManager *WalletManagerFactory::getWalletManager()
     return g_walletManager;
 }
 
+void WalletManagerFactory::setLogLevel(int level)
+{
+    epee::log_space::log_singletone::get_set_log_detalisation_level(true, level);
+}
+
 
 
 }
diff --git a/src/wallet/wallet2_api.h b/src/wallet/wallet2_api.h
index 66987e4c5..2c5836573 100644
--- a/src/wallet/wallet2_api.h
+++ b/src/wallet/wallet2_api.h
@@ -50,6 +50,14 @@ struct PendingTransaction
         Status_Ok,
         Status_Error
     };
+
+    enum Priority {
+        Priority_Low = 1,
+        Priority_Medium = 2,
+        Priority_High = 3,
+        Priority_Last
+    };
+
     virtual ~PendingTransaction() = 0;
     virtual int status() const = 0;
     virtual std::string errorString() const = 0;
@@ -108,7 +116,10 @@ struct WalletListener
     virtual ~WalletListener() = 0;
     virtual void moneySpent(const std::string &txId, uint64_t amount) = 0;
     virtual void moneyReceived(const std::string &txId, uint64_t amount) = 0;
-    // TODO: on_skip_transaction;
+    // generic callback, called when any event (sent/received/block reveived/etc) happened with the wallet;
+    virtual void updated() = 0;
+    // called when wallet refreshed by background thread or explicitly called be calling "refresh" synchronously
+    virtual void refreshed() = 0;
 };
 
 
@@ -163,9 +174,38 @@ struct Wallet
      * \return
      */
     virtual std::string keysFilename() const = 0;
-
+    /*!
+     * \brief init - initializes wallet with daemon connection params. implicitly connects to the daemon
+     *               and refreshes the wallet. "refreshed" callback will be invoked. if daemon_address is
+     *               local address, "trusted daemon" will be set to true forcibly
+     *
+     * \param daemon_address - daemon address in "hostname:port" format
+     * \param upper_transaction_size_limit
+     * \return  - true if initialized and refreshed successfully
+     */
     virtual bool init(const std::string &daemon_address, uint64_t upper_transaction_size_limit) = 0;
+
+    /*!
+     * \brief init - initalizes wallet asynchronously. logic is the same as "init" but returns immediately.
+     *               "refreshed" callback will be invoked.
+     *
+     * \param daemon_address - daemon address in "hostname:port" format
+     * \param upper_transaction_size_limit
+     * \return  - true if initialized and refreshed successfully
+     */
+    virtual void initAsync(const std::string &daemon_address, uint64_t upper_transaction_size_limit) = 0;
+
+    /**
+     * @brief connectToDaemon - connects to the daemon. TODO: check if it can be removed
+     * @return
+     */
     virtual bool connectToDaemon() = 0;
+
+    /**
+     * @brief connected - checks if the wallet connected to the daemon
+     * @return - true if connected
+     */
+    virtual bool connected() const = 0;
     virtual void setTrustedDaemon(bool arg) = 0;
     virtual bool trustedDaemon() const = 0;
     virtual uint64_t balance() const = 0;
@@ -175,23 +215,36 @@ struct Wallet
     static uint64_t amountFromString(const std::string &amount);
     static uint64_t amountFromDouble(double amount);
     static std::string genPaymentId();
+    static bool paymentIdValid(const std::string &paiment_id);
 
-    // TODO?
-    // virtual uint64_t unlockedDustBalance() const = 0;
+    /**
+     * @brief refresh - refreshes the wallet, updating transactions from daemon
+     * @return - true if refreshed successfully;
+     */
     virtual bool refresh() = 0;
+    /**
+     * @brief refreshAsync - refreshes wallet asynchronously.
+     */
+    virtual void refreshAsync() = 0;
     /*!
      * \brief createTransaction creates transaction. if dst_addr is an integrated address, payment_id is ignored
      * \param dst_addr          destination address as string
      * \param payment_id        optional payment_id, can be empty string
      * \param amount            amount
      * \param mixin_count       mixin count. if 0 passed, wallet will use default value
+     * \param priority
      * \return                  PendingTransaction object. caller is responsible to check PendingTransaction::status()
      *                          after object returned
      */
 
     virtual PendingTransaction * createTransaction(const std::string &dst_addr, const std::string &payment_id,
-                                                   uint64_t amount, uint32_t mixin_count) = 0;
+                                                   uint64_t amount, uint32_t mixin_count,
+                                                   PendingTransaction::Priority = PendingTransaction::Priority_Low) = 0;
 
+    /*!
+     * \brief disposeTransaction - destroys transaction object
+     * \param t -  pointer to the "PendingTransaction" object. Pointer is not valid after function returned;
+     */
     virtual void disposeTransaction(PendingTransaction * t) = 0;
     virtual TransactionHistory * history() const = 0;
     virtual void setListener(WalletListener *) = 0;
@@ -271,8 +324,22 @@ struct WalletManager
 
 struct WalletManagerFactory
 {
+    // logging levels for underlying library
+    enum LogLevel {
+        LogLevel_Silent = -1,
+        LogLevel_0 = 0,
+        LogLevel_1 = 1,
+        LogLevel_2 = 2,
+        LogLevel_3 = 3,
+        LogLevel_4 = 4,
+        LogLevel_Min = LogLevel_Silent,
+        LogLevel_Max = LogLevel_4
+    };
+
     static WalletManager * getWalletManager();
+    static void setLogLevel(int level);
 };
 
+
 }
 
diff --git a/tests/libwallet_api_tests/main.cpp b/tests/libwallet_api_tests/main.cpp
index f6f1b0832..d642534b0 100644
--- a/tests/libwallet_api_tests/main.cpp
+++ b/tests/libwallet_api_tests/main.cpp
@@ -31,6 +31,7 @@
 #include "gtest/gtest.h"
 
 #include "wallet/wallet2_api.h"
+#include "include_base_utils.h"
 
 #include <boost/filesystem.hpp>
 #include <boost/algorithm/string.hpp>
@@ -39,6 +40,8 @@
 #include <vector>
 #include <mutex>
 #include <thread>
+#include <atomic>
+#include <condition_variable>
 
 
 using namespace std;
@@ -137,6 +140,7 @@ struct WalletManagerTest : public testing::Test
     {
         std::cout << __FUNCTION__ << std::endl;
         wmgr = Bitmonero::WalletManagerFactory::getWalletManager();
+        // Bitmonero::WalletManagerFactory::setLogLevel(Bitmonero::WalletManagerFactory::LogLevel_4);
         Utils::deleteWallet(WALLET_NAME);
         Utils::deleteDir(boost::filesystem::path(WALLET_NAME_WITH_DIR).parent_path().string());
     }
@@ -235,7 +239,7 @@ TEST_F(WalletManagerTest, WalletManagerMovesWallet)
 }
 
 
-/*
+
 TEST_F(WalletManagerTest, WalletManagerChangesPassword)
 {
     Bitmonero::Wallet * wallet1 = wmgr->createWallet(WALLET_NAME, WALLET_PASS, WALLET_LANG);
@@ -243,7 +247,7 @@ TEST_F(WalletManagerTest, WalletManagerChangesPassword)
     ASSERT_TRUE(wallet1->setPassword(WALLET_PASS2));
     ASSERT_TRUE(wmgr->closeWallet(wallet1));
     Bitmonero::Wallet * wallet2 = wmgr->openWallet(WALLET_NAME, WALLET_PASS2);
-    ASSERT_TRUE(wallet2->status() == Bitmonero::Wallet::Status_Ok);quint64
+    ASSERT_TRUE(wallet2->status() == Bitmonero::Wallet::Status_Ok);
     ASSERT_TRUE(wallet2->seed() == seed1);
     ASSERT_TRUE(wmgr->closeWallet(wallet2));
     Bitmonero::Wallet * wallet3 = wmgr->openWallet(WALLET_NAME, WALLET_PASS);
@@ -343,7 +347,9 @@ TEST_F(WalletManagerTest, WalletManagerStoresWallet4)
     ASSERT_TRUE(wallet1->address() == address1);
     ASSERT_TRUE(wmgr->closeWallet(wallet1));
 }
-*/
+
+
+
 
 TEST_F(WalletManagerTest, WalletManagerFindsWallet)
 {
@@ -415,7 +421,7 @@ TEST_F(WalletTest1, WalletConvertsToString)
 }
 
 
-/*
+
 TEST_F(WalletTest1, WalletTransaction)
 {
     Bitmonero::Wallet * wallet1 = wmgr->openWallet(CURRENT_SRC_WALLET, TESTNET_WALLET_PASS, true);
@@ -429,8 +435,10 @@ TEST_F(WalletTest1, WalletTransaction)
     wallet1->setDefaultMixin(1);
     ASSERT_TRUE(wallet1->defaultMixin() == 1);
 
-    Bitmonero::PendingTransaction * transaction = wallet1->createTransaction(
-                recepient_address, AMOUNT_10XMR);
+    Bitmonero::PendingTransaction * transaction = wallet1->createTransaction(recepient_address,
+                                                                             PAYMENT_ID_EMPTY,
+                                                                             AMOUNT_10XMR,
+                                                                             1);
     ASSERT_TRUE(transaction->status() == Bitmonero::PendingTransaction::Status_Ok);
     wallet1->refresh();
 
@@ -440,7 +448,6 @@ TEST_F(WalletTest1, WalletTransaction)
     ASSERT_FALSE(wallet1->balance() == balance);
     ASSERT_TRUE(wmgr->closeWallet(wallet1));
 }
-*/
 
 TEST_F(WalletTest1, WalletTransactionWithMixin)
 {
@@ -482,6 +489,48 @@ TEST_F(WalletTest1, WalletTransactionWithMixin)
     ASSERT_TRUE(wmgr->closeWallet(wallet1));
 }
 
+TEST_F(WalletTest1, WalletTransactionWithPriority)
+{
+
+    std::string payment_id = "";
+
+    Bitmonero::Wallet * wallet1 = wmgr->openWallet(CURRENT_SRC_WALLET, TESTNET_WALLET_PASS, true);
+
+    // make sure testnet daemon is running
+    ASSERT_TRUE(wallet1->init(TESTNET_DAEMON_ADDRESS, 0));
+    ASSERT_TRUE(wallet1->refresh());
+    uint64_t balance = wallet1->balance();
+    ASSERT_TRUE(wallet1->status() == Bitmonero::PendingTransaction::Status_Ok);
+
+    std::string recepient_address = Utils::get_wallet_address(CURRENT_DST_WALLET, TESTNET_WALLET_PASS);
+    uint32_t mixin = 2;
+    uint64_t fee   = 0;
+
+    std::vector<Bitmonero::PendingTransaction::Priority> priorities =  {
+         Bitmonero::PendingTransaction::Priority_Low,
+         Bitmonero::PendingTransaction::Priority_Medium,
+         Bitmonero::PendingTransaction::Priority_High
+    };
+
+    for (auto it = priorities.begin(); it != priorities.end(); ++it) {
+        std::cerr << "Transaction priority: " << *it << std::endl;
+        Bitmonero::PendingTransaction * transaction = wallet1->createTransaction(
+                    recepient_address, payment_id, AMOUNT_5XMR, mixin, *it);
+        std::cerr << "Transaction status: " << transaction->status() << std::endl;
+        std::cerr << "Transaction fee: " << Bitmonero::Wallet::displayAmount(transaction->fee()) << std::endl;
+        std::cerr << "Transaction error: " << transaction->errorString() << std::endl;
+        ASSERT_TRUE(transaction->fee() > fee);
+        ASSERT_TRUE(transaction->status() == Bitmonero::PendingTransaction::Status_Ok);
+        fee = transaction->fee();
+        wallet1->disposeTransaction(transaction);
+    }
+    wallet1->refresh();
+    ASSERT_TRUE(wallet1->balance() == balance);
+    ASSERT_TRUE(wmgr->closeWallet(wallet1));
+}
+
+
+
 TEST_F(WalletTest1, WalletHistory)
 {
     Bitmonero::Wallet * wallet1 = wmgr->openWallet(CURRENT_SRC_WALLET, TESTNET_WALLET_PASS, true);
@@ -522,7 +571,7 @@ TEST_F(WalletTest1, WalletTransactionAndHistory)
 
     Bitmonero::PendingTransaction * tx = wallet_src->createTransaction(wallet4_addr,
                                                                        PAYMENT_ID_EMPTY,
-                                                                       AMOUNT_10XMR * 5, 0);
+                                                                       AMOUNT_10XMR * 5, 1);
 
     ASSERT_TRUE(tx->status() == Bitmonero::PendingTransaction::Status_Ok);
     ASSERT_TRUE(tx->commit());
@@ -586,100 +635,193 @@ TEST_F(WalletTest1, WalletTransactionWithPaymentId)
     ASSERT_TRUE(payment_id_in_history);
 }
 
+
 struct MyWalletListener : public Bitmonero::WalletListener
 {
 
     Bitmonero::Wallet * wallet;
     uint64_t total_tx;
     uint64_t total_rx;
-    std::timed_mutex  guard;
+    std::mutex  mutex;
+    std::condition_variable cv_send;
+    std::condition_variable cv_receive;
+    std::condition_variable cv_update;
+    std::condition_variable cv_refresh;
+    bool send_triggered;
+    bool receive_triggered;
+    bool update_triggered;
+    bool refresh_triggered;
+
+
 
     MyWalletListener(Bitmonero::Wallet * wallet)
         : total_tx(0), total_rx(0)
     {
+        reset();
+
         this->wallet = wallet;
         this->wallet->setListener(this);
     }
 
+    void reset()
+    {
+        send_triggered = receive_triggered = update_triggered = refresh_triggered = false;
+    }
+
     virtual void moneySpent(const string &txId, uint64_t amount)
     {
-        std::cout << "wallet: " << wallet->address() << " just spent money ("
+        std::cerr << "wallet: " << wallet->address() << "**** just spent money ("
                   << txId  << ", " << wallet->displayAmount(amount) << ")" << std::endl;
         total_tx += amount;
-        guard.unlock();
+        send_triggered = true;
+        cv_send.notify_one();
     }
 
     virtual void moneyReceived(const string &txId, uint64_t amount)
     {
-        std::cout << "wallet: " << wallet->address() << " just received money ("
+        std::cout << "wallet: " << wallet->address() << "**** just received money ("
                   << txId  << ", " << wallet->displayAmount(amount) << ")" << std::endl;
         total_rx += amount;
-        guard.unlock();
+        receive_triggered = true;
+        cv_receive.notify_one();
     }
+
+    virtual void updated()
+    {
+        std::cout << __FUNCTION__ << "Wallet updated";
+        update_triggered = true;
+        cv_update.notify_one();
+    }
+
+    virtual void refreshed()
+    {
+        std::cout << __FUNCTION__ <<  "Wallet refreshed";
+        refresh_triggered = true;
+        cv_refresh.notify_one();
+    }
+
 };
 
-/*
+
+TEST_F(WalletTest2, WalletCallBackRefreshedSync)
+{
+
+    Bitmonero::Wallet * wallet_src = wmgr->openWallet(CURRENT_SRC_WALLET, TESTNET_WALLET_PASS, true);
+    MyWalletListener * wallet_src_listener = new MyWalletListener(wallet_src);
+    ASSERT_TRUE(wallet_src->init(TESTNET_DAEMON_ADDRESS, 0));
+    ASSERT_TRUE(wallet_src_listener->refresh_triggered);
+    ASSERT_TRUE(wallet_src->connected());
+//    std::chrono::seconds wait_for = std::chrono::seconds(60*3);
+//    std::unique_lock<std::mutex> lock (wallet_src_listener->mutex);
+//    wallet_src_listener->cv_refresh.wait_for(lock, wait_for);
+    wmgr->closeWallet(wallet_src);
+}
+
+
+TEST_F(WalletTest2, WalletCallBackRefreshedAsync)
+{
+
+    Bitmonero::Wallet * wallet_src = wmgr->openWallet(CURRENT_SRC_WALLET, TESTNET_WALLET_PASS, true);
+    MyWalletListener * wallet_src_listener = new MyWalletListener(wallet_src);
+
+    std::chrono::seconds wait_for = std::chrono::seconds(20);
+    std::unique_lock<std::mutex> lock (wallet_src_listener->mutex);
+    wallet_src->initAsync(TESTNET_DAEMON_ADDRESS, 0);
+    std::cerr << "TEST: waiting on refresh lock...\n";
+    wallet_src_listener->cv_refresh.wait_for(lock, wait_for);
+    std::cerr << "TEST: refresh lock acquired...\n";
+    ASSERT_TRUE(wallet_src_listener->refresh_triggered);
+    ASSERT_TRUE(wallet_src->connected());
+    std::cerr << "TEST: closing wallet...\n";
+    wmgr->closeWallet(wallet_src);
+}
+
+
+
 TEST_F(WalletTest2, WalletCallbackSent)
 {
 
-    Bitmonero::Wallet * wallet_src = wmgr->openWallet(TESTNET_WALLET3_NAME, TESTNET_WALLET_PASS, true);
+    Bitmonero::Wallet * wallet_src = wmgr->openWallet(CURRENT_SRC_WALLET, TESTNET_WALLET_PASS, true);
     // make sure testnet daemon is running
     ASSERT_TRUE(wallet_src->init(TESTNET_DAEMON_ADDRESS, 0));
     ASSERT_TRUE(wallet_src->refresh());
     MyWalletListener * wallet_src_listener = new MyWalletListener(wallet_src);
+    uint64_t balance = wallet_src->balance();
     std::cout << "** Balance: " << wallet_src->displayAmount(wallet_src->balance()) <<  std::endl;
+    Bitmonero::Wallet * wallet_dst = wmgr->openWallet(CURRENT_DST_WALLET, TESTNET_WALLET_PASS, true);
+
+    uint64_t amount = AMOUNT_1XMR * 5;
+    std::cout << "** Sending " << Bitmonero::Wallet::displayAmount(amount) << " to " << wallet_dst->address();
 
 
-    uint64_t amount = AMOUNT_10XMR * 5;
-    std::cout << "** Sending " << Bitmonero::Wallet::displayAmount(amount) << " to " << TESTNET_WALLET4_ADDRESS;
-    Bitmonero::PendingTransaction * tx = wallet_src->createTransaction(TESTNET_WALLET4_ADDRESS, AMOUNT_1XMR * 5);
+    Bitmonero::PendingTransaction * tx = wallet_src->createTransaction(wallet_dst->address(),
+                                                                       PAYMENT_ID_EMPTY,
+                                                                       amount, 1);
+    std::cout << "** Committing transaction: " << Bitmonero::Wallet::displayAmount(tx->amount())
+              << " with fee: " << Bitmonero::Wallet::displayAmount(tx->fee());
+
     ASSERT_TRUE(tx->status() == Bitmonero::PendingTransaction::Status_Ok);
     ASSERT_TRUE(tx->commit());
 
     std::chrono::seconds wait_for = std::chrono::seconds(60*3);
-
-    wallet_src_listener->guard.lock();
-    wallet_src_listener->guard.try_lock_for(wait_for);
-
-    ASSERT_TRUE(wallet_src_listener->total_tx != 0);
+    std::unique_lock<std::mutex> lock (wallet_src_listener->mutex);
+    std::cerr << "TEST: waiting on send lock...\n";
+    wallet_src_listener->cv_send.wait_for(lock, wait_for);
+    std::cerr << "TEST: send lock acquired...\n";
+    ASSERT_TRUE(wallet_src_listener->send_triggered);
+    ASSERT_TRUE(wallet_src_listener->update_triggered);
+    std::cout << "** Balance: " << wallet_src->displayAmount(wallet_src->balance()) <<  std::endl;
+    ASSERT_TRUE(wallet_src->balance() < balance);
+    wmgr->closeWallet(wallet_src);
+    wmgr->closeWallet(wallet_dst);
 }
-*/
 
-/*
+
 TEST_F(WalletTest2, WalletCallbackReceived)
 {
 
-    Bitmonero::Wallet * wallet_src = wmgr->openWallet(TESTNET_WALLET3_NAME, TESTNET_WALLET_PASS, true);
+    Bitmonero::Wallet * wallet_src = wmgr->openWallet(TESTNET_WALLET5_NAME, TESTNET_WALLET_PASS, true);
     // make sure testnet daemon is running
     ASSERT_TRUE(wallet_src->init(TESTNET_DAEMON_ADDRESS, 0));
     ASSERT_TRUE(wallet_src->refresh());
     std::cout << "** Balance: " << wallet_src->displayAmount(wallet_src->balance()) <<  std::endl;
 
-    Bitmonero::Wallet * wallet_dst = wmgr->openWallet(TESTNET_WALLET4_NAME, TESTNET_WALLET_PASS, true);
+    Bitmonero::Wallet * wallet_dst = wmgr->openWallet(CURRENT_DST_WALLET, TESTNET_WALLET_PASS, true);
     ASSERT_TRUE(wallet_dst->init(TESTNET_DAEMON_ADDRESS, 0));
     ASSERT_TRUE(wallet_dst->refresh());
+    uint64_t balance = wallet_dst->balance();
     MyWalletListener * wallet_dst_listener = new MyWalletListener(wallet_dst);
 
-
     uint64_t amount = AMOUNT_1XMR * 5;
-    std::cout << "** Sending " << Bitmonero::Wallet::displayAmount(amount) << " to " << TESTNET_WALLET4_ADDRESS;
-    Bitmonero::PendingTransaction * tx = wallet_src->createTransaction(TESTNET_WALLET4_ADDRESS, AMOUNT_1XMR * 5);
+    std::cout << "** Sending " << Bitmonero::Wallet::displayAmount(amount) << " to " << wallet_dst->address();
+    Bitmonero::PendingTransaction * tx = wallet_src->createTransaction(wallet_dst->address(),
+                                                                       PAYMENT_ID_EMPTY,
+                                                                       amount, 1);
+
+    std::cout << "** Committing transaction: " << Bitmonero::Wallet::displayAmount(tx->amount())
+              << " with fee: " << Bitmonero::Wallet::displayAmount(tx->fee());
+
     ASSERT_TRUE(tx->status() == Bitmonero::PendingTransaction::Status_Ok);
     ASSERT_TRUE(tx->commit());
 
     std::chrono::seconds wait_for = std::chrono::seconds(60*4);
+    std::unique_lock<std::mutex> lock (wallet_dst_listener->mutex);
+    std::cerr << "TEST: waiting on receive lock...\n";
+    wallet_dst_listener->cv_receive.wait_for(lock, wait_for);
+    std::cerr << "TEST: receive lock acquired...\n";
+    ASSERT_TRUE(wallet_dst_listener->receive_triggered);
+    ASSERT_TRUE(wallet_dst_listener->update_triggered);
+    std::cout << "** Balance: " << wallet_dst->displayAmount(wallet_src->balance()) <<  std::endl;
+    ASSERT_TRUE(wallet_dst->balance() > balance);
 
-    wallet_dst_listener->guard.lock();
-    wallet_dst_listener->guard.try_lock_for(wait_for);
-
-    ASSERT_TRUE(wallet_dst_listener->total_tx != 0);
-
+    wmgr->closeWallet(wallet_src);
+    wmgr->closeWallet(wallet_dst);
 }
-*/
+
 
 int main(int argc, char** argv)
 {
 
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
 }
diff --git a/tests/libwallet_api_tests/scripts/send_funds.sh b/tests/libwallet_api_tests/scripts/send_funds.sh
index 306b06a40..437e4f240 100755
--- a/tests/libwallet_api_tests/scripts/send_funds.sh
+++ b/tests/libwallet_api_tests/scripts/send_funds.sh
@@ -12,11 +12,23 @@ function send_funds {
 }
 
 
-send_funds 100 wallet_01.bin
-send_funds 100 wallet_02.bin
-send_funds 100 wallet_03.bin
-send_funds 100 wallet_04.bin
-send_funds 100 wallet_05.bin
-send_funds 100 wallet_06.bin
+function seed_wallets {
+    local amount=$1
+    send_funds $amount wallet_01.bin
+    send_funds $amount wallet_02.bin
+    send_funds $amount wallet_03.bin
+    send_funds $amount wallet_04.bin
+    send_funds $amount wallet_05.bin
+    send_funds $amount wallet_06.bin
+}
+
+seed_wallets 1
+seed_wallets 2
+seed_wallets 5
+seed_wallets 10
+seed_wallets 20
+seed_wallets 50
+seed_wallets 100
+