diff --git a/src/interface/node.h b/src/interface/node.h
--- a/src/interface/node.h
+++ b/src/interface/node.h
@@ -5,12 +5,15 @@
 #ifndef BITCOIN_INTERFACE_NODE_H
 #define BITCOIN_INTERFACE_NODE_H
 
+#include <netaddress.h> // For Network
+
 #include <functional>
 #include <memory>
 #include <string>
 
 class Config;
 class HTTPRPCRequestProcessor;
+class proxyType;
 class RPCServer;
 
 namespace interface {
@@ -25,6 +28,13 @@
     //! Set command line arguments.
     virtual void parseParameters(int argc, const char *const argv[]) = 0;
 
+    //! Set a command line argument if it doesn't already have a value
+    virtual bool softSetArg(const std::string &arg,
+                            const std::string &value) = 0;
+
+    //! Set a command line boolean argument if it doesn't already have a value
+    virtual bool softSetBoolArg(const std::string &arg, bool value) = 0;
+
     //! Load settings from configuration file.
     virtual void readConfigFile(const std::string &conf_path) = 0;
 
@@ -54,6 +64,12 @@
     //! Start shutdown.
     virtual void startShutdown() = 0;
 
+    //! Map port.
+    virtual void mapPort(bool use_upnp) = 0;
+
+    //! Get proxy.
+    virtual bool getProxy(Network net, proxyType &proxy_info) = 0;
+
     //! Register handler for init messages.
     using InitMessageFn = std::function<void(const std::string &message)>;
     virtual std::unique_ptr<Handler> handleInitMessage(InitMessageFn fn) = 0;
diff --git a/src/interface/node.cpp b/src/interface/node.cpp
--- a/src/interface/node.cpp
+++ b/src/interface/node.cpp
@@ -8,6 +8,9 @@
 #include <config.h>
 #include <init.h>
 #include <interface/handler.h>
+#include <net.h>
+#include <netaddress.h>
+#include <netbase.h>
 #include <scheduler.h>
 #include <ui_interface.h>
 #include <util.h>
@@ -27,6 +30,13 @@
         void readConfigFile(const std::string &conf_path) override {
             gArgs.ReadConfigFile(conf_path);
         }
+        bool softSetArg(const std::string &arg,
+                        const std::string &value) override {
+            return gArgs.SoftSetArg(arg, value);
+        }
+        bool softSetBoolArg(const std::string &arg, bool value) override {
+            return gArgs.SoftSetBoolArg(arg, value);
+        }
         void selectParams(const std::string &network) override {
             SelectParams(network);
         }
@@ -50,6 +60,17 @@
             Shutdown();
         }
         void startShutdown() override { StartShutdown(); }
+        void mapPort(bool use_upnp) override {
+            if (use_upnp) {
+                StartMapPort();
+            } else {
+                InterruptMapPort();
+                StopMapPort();
+            }
+        }
+        bool getProxy(Network net, proxyType &proxy_info) override {
+            return GetProxy(net, proxy_info);
+        }
         std::unique_ptr<Handler> handleInitMessage(InitMessageFn fn) override {
             return MakeHandler(::uiInterface.InitMessage.connect(fn));
         }
diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -345,7 +345,7 @@
 #endif
 
 void BitcoinApplication::createOptionsModel(bool resetSettings) {
-    optionsModel = new OptionsModel(nullptr, resetSettings);
+    optionsModel = new OptionsModel(m_node, nullptr, resetSettings);
 }
 
 void BitcoinApplication::createWindow(const Config *config,
diff --git a/src/qt/optionsmodel.h b/src/qt/optionsmodel.h
--- a/src/qt/optionsmodel.h
+++ b/src/qt/optionsmodel.h
@@ -9,6 +9,10 @@
 
 #include <QAbstractListModel>
 
+namespace interface {
+class Node;
+}
+
 QT_BEGIN_NAMESPACE
 class QNetworkProxy;
 QT_END_NAMESPACE
@@ -26,7 +30,8 @@
     Q_OBJECT
 
 public:
-    explicit OptionsModel(QObject *parent = 0, bool resetSettings = false);
+    explicit OptionsModel(interface::Node &node, QObject *parent = 0,
+                          bool resetSettings = false);
 
     enum OptionID {
         StartAtStartup,      // bool
@@ -80,6 +85,7 @@
     bool isRestartRequired() const;
 
 private:
+    interface::Node &m_node;
     /* Qt-only settings */
     bool fHideTrayIcon;
     bool fMinimizeToTray;
diff --git a/src/qt/optionsmodel.cpp b/src/qt/optionsmodel.cpp
--- a/src/qt/optionsmodel.cpp
+++ b/src/qt/optionsmodel.cpp
@@ -12,26 +12,22 @@
 #include "guiutil.h"
 
 #include "amount.h"
-#include "init.h"
+#include "interface/node.h"
 #include "intro.h"
 #include "net.h"
 #include "netbase.h"
 #include "txdb.h"       // for -dbcache defaults
 #include "validation.h" // For DEFAULT_SCRIPTCHECK_THREADS
 
-#ifdef ENABLE_WALLET
-#include "wallet/wallet.h"
-#include "wallet/walletdb.h"
-#endif
-
 #include <QNetworkProxy>
 #include <QSettings>
 #include <QStringList>
 
 const char *DEFAULT_GUI_PROXY_HOST = "127.0.0.1";
 
-OptionsModel::OptionsModel(QObject *parent, bool resetSettings)
-    : QAbstractListModel(parent) {
+OptionsModel::OptionsModel(interface::Node &node, QObject *parent,
+                           bool resetSettings)
+    : QAbstractListModel(parent), m_node(node) {
     Init(resetSettings);
 }
 
@@ -104,7 +100,7 @@
     if (!settings.contains("nDatabaseCache")) {
         settings.setValue("nDatabaseCache", (qint64)nDefaultDbCache);
     }
-    if (!gArgs.SoftSetArg(
+    if (!m_node.softSetArg(
             "-dbcache",
             settings.value("nDatabaseCache").toString().toStdString())) {
         addOverriddenOption("-dbcache");
@@ -113,7 +109,7 @@
     if (!settings.contains("nThreadsScriptVerif")) {
         settings.setValue("nThreadsScriptVerif", DEFAULT_SCRIPTCHECK_THREADS);
     }
-    if (!gArgs.SoftSetArg(
+    if (!m_node.softSetArg(
             "-par",
             settings.value("nThreadsScriptVerif").toString().toStdString())) {
         addOverriddenOption("-par");
@@ -128,7 +124,7 @@
     if (!settings.contains("bSpendZeroConfChange")) {
         settings.setValue("bSpendZeroConfChange", true);
     }
-    if (!gArgs.SoftSetBoolArg(
+    if (!m_node.softSetBoolArg(
             "-spendzeroconfchange",
             settings.value("bSpendZeroConfChange").toBool())) {
         addOverriddenOption("-spendzeroconfchange");
@@ -139,14 +135,14 @@
     if (!settings.contains("fUseUPnP")) {
         settings.setValue("fUseUPnP", DEFAULT_UPNP);
     }
-    if (!gArgs.SoftSetBoolArg("-upnp", settings.value("fUseUPnP").toBool())) {
+    if (!m_node.softSetBoolArg("-upnp", settings.value("fUseUPnP").toBool())) {
         addOverriddenOption("-upnp");
     }
 
     if (!settings.contains("fListen")) {
         settings.setValue("fListen", DEFAULT_LISTEN);
     }
-    if (!gArgs.SoftSetBoolArg("-listen", settings.value("fListen").toBool())) {
+    if (!m_node.softSetBoolArg("-listen", settings.value("fListen").toBool())) {
         addOverriddenOption("-listen");
     }
 
@@ -160,7 +156,7 @@
     }
     // Only try to set -proxy, if user has enabled fUseProxy
     if (settings.value("fUseProxy").toBool() &&
-        !gArgs.SoftSetArg(
+        !m_node.softSetArg(
             "-proxy", settings.value("addrProxy").toString().toStdString())) {
         addOverriddenOption("-proxy");
     } else if (!settings.value("fUseProxy").toBool() &&
@@ -178,7 +174,7 @@
     }
     // Only try to set -onion, if user has enabled fUseSeparateProxyTor
     if (settings.value("fUseSeparateProxyTor").toBool() &&
-        !gArgs.SoftSetArg(
+        !m_node.softSetArg(
             "-onion",
             settings.value("addrSeparateProxyTor").toString().toStdString())) {
         addOverriddenOption("-onion");
@@ -191,7 +187,7 @@
     if (!settings.contains("language")) {
         settings.setValue("language", "");
     }
-    if (!gArgs.SoftSetArg(
+    if (!m_node.softSetArg(
             "-lang", settings.value("language").toString().toStdString())) {
         addOverriddenOption("-lang");
     }
@@ -336,12 +332,7 @@
                 break;
             case MapPortUPnP: // core option - can be changed on-the-fly
                 settings.setValue("fUseUPnP", value.toBool());
-                if (value.toBool()) {
-                    StartMapPort();
-                } else {
-                    InterruptMapPort();
-                    StopMapPort();
-                }
+                m_node.mapPort(value.toBool());
                 break;
             case MinimizeOnClose:
                 fMinimizeOnClose = value.toBool();
@@ -471,7 +462,7 @@
     // Directly query current base proxy, because
     // GUI settings can be overridden with -proxy.
     proxyType curProxy;
-    if (GetProxy(NET_IPV4, curProxy)) {
+    if (m_node.getProxy(NET_IPV4, curProxy)) {
         proxy.setType(QNetworkProxy::Socks5Proxy);
         proxy.setHostName(QString::fromStdString(curProxy.proxy.ToStringIP()));
         proxy.setPort(curProxy.proxy.GetPort());
diff --git a/src/qt/test/paymentservertests.cpp b/src/qt/test/paymentservertests.cpp
--- a/src/qt/test/paymentservertests.cpp
+++ b/src/qt/test/paymentservertests.cpp
@@ -8,6 +8,7 @@
 #include "paymentrequestdata.h"
 
 #include "amount.h"
+#include "interface/node.h"
 #include "random.h"
 #include "script/script.h"
 #include "script/standard.h"
@@ -64,7 +65,8 @@
 
 void PaymentServerTests::paymentServerTests() {
     SelectParams(CBaseChainParams::MAIN);
-    OptionsModel optionsModel;
+    auto node = interface::MakeNode();
+    OptionsModel optionsModel(*node);
     PaymentServer *server = new PaymentServer(nullptr, false);
     X509_STORE *caStore = X509_STORE_new();
     X509_STORE_add_cert(caStore, parse_b64der_cert(caCert1_BASE64));
diff --git a/src/qt/test/wallettests.cpp b/src/qt/test/wallettests.cpp
--- a/src/qt/test/wallettests.cpp
+++ b/src/qt/test/wallettests.cpp
@@ -3,6 +3,7 @@
 #include "chainparams.h"
 #include "config.h"
 #include "dstencode.h"
+#include "interface/node.h"
 #include "qt/bitcoinamountfield.h"
 #include "qt/optionsmodel.h"
 #include "qt/overviewpage.h"
@@ -139,7 +140,8 @@
     std::unique_ptr<const PlatformStyle> platformStyle(
         PlatformStyle::instantiate("other"));
     SendCoinsDialog sendCoinsDialog(platformStyle.get());
-    OptionsModel optionsModel;
+    auto node = interface::MakeNode();
+    OptionsModel optionsModel(*node);
     WalletModel walletModel(platformStyle.get(), &wallet, &optionsModel);
     sendCoinsDialog.setModel(&walletModel);