diff --git a/src/api/ApiClient.cpp b/src/api/ApiClient.cpp
new file mode 100644
index 0000000..25d992a
--- /dev/null
+++ b/src/api/ApiClient.cpp
@@ -0,0 +1,87 @@
+#include "ApiClient.h"
+
+#include <QCryptographicHash>
+#include <QNetworkReply>
+#include <QRandomGenerator>
+#include <QRegularExpression>
+#include <QUrl>
+#include <QUrlQuery>
+
+ApiClient::ApiClient(QObject* parent) : QObject(parent) {}
+
+static QString md5Hex(const QByteArray& data) {
+  return QString(
+      QCryptographicHash::hash(data, QCryptographicHash::Md5).toHex());
+}
+
+// Subsonic/OpenSubsonic Token-Auth: t = md5(password + salt), s = salt
+// :contentReference[oaicite:5]{index=5}
+QString ApiClient::buildAuthQuery(const QString& user,
+                                  const QString& password) const {
+  const QString salt =
+      QString::number(QRandomGenerator::global()->generate(), 16);
+  const QString token = md5Hex((password + salt).toUtf8());
+
+  QUrlQuery q;
+  q.addQueryItem("u", user);
+  q.addQueryItem("t", token);
+  q.addQueryItem("s", salt);
+  q.addQueryItem("v", "1.16.1");  // Navidrome ist kompatibel zu 1.16.1
+                                  // :contentReference[oaicite:6]{index=6}
+  q.addQueryItem("c", "myQtClient");
+  q.addQueryItem("f", "json");
+  return q.toString(QUrl::FullyEncoded);
+}
+
+void ApiClient::setLastStatus(const QString& s) {
+  if (m_lastStatus == s) return;
+  m_lastStatus = s;
+  emit lastStatusChanged();
+}
+
+void ApiClient::ping(const QString& host, const QString& user,
+                     const QString& password) {
+  if (host.trimmed().isEmpty()) {
+    emit pingFinished(false, "Host ist leer.");
+    return;
+  }
+
+  QUrl base(host);
+  if (!base.isValid()) {
+    emit pingFinished(false, "Host-URL ist ungültig.");
+    return;
+  }
+
+  // Sauber zusammensetzen, egal ob host mit/ohne trailing slash kommt
+  QUrl url(base.toString().remove(QRegularExpression("/+$")) +
+           "/rest/ping.view");
+  QUrlQuery q(buildAuthQuery(user, password));
+  url.setQuery(q);
+
+  setLastStatus("Sende Ping…");
+
+  QNetworkRequest req(url);
+  req.setHeader(QNetworkRequest::UserAgentHeader, "navidrome_client/0.1");
+
+  QNetworkReply* reply = m_manager.get(req);
+
+  connect(reply, &QNetworkReply::finished, this, [this, reply]() {
+    const auto err = reply->error();
+    const QByteArray body = reply->readAll();
+    reply->deleteLater();
+
+    if (err != QNetworkReply::NoError) {
+      const QString msg = "Netzwerkfehler: " + reply->errorString();
+      setLastStatus(msg);
+      emit pingFinished(false, msg);
+      return;
+    }
+
+    // Fürs Erste: “kommt was zurück?” reicht. Später kannst du JSON parsen und
+    // "status":"ok" prüfen.
+    const QString msg =
+        "Ping OK, Antwort: " + QString::fromUtf8(body.left(300));
+    setLastStatus("Ping OK");
+    emit pingFinished(true, msg);
+  });
+}
diff --git a/src/api/ApiClient.h b/src/api/ApiClient.h
index e69de29..53403a8 100644
--- a/src/api/ApiClient.h
+++ b/src/api/ApiClient.h
@@ -0,0 +1,31 @@
+#ifndef APICLIENT_H
+#define APICLIENT_H
+
+#include <QNetworkAccessManager>
+#include <QObject>
+
+class ApiClient : public QObject {
+  Q_OBJECT
+  Q_PROPERTY(QString lastStatus READ lastStatus NOTIFY lastStatusChanged)
+
+ public:
+  explicit ApiClient(QObject* parent = nullptr);
+
+  Q_INVOKABLE void ping(const QString& host, const QString& user,
+                        const QString& password);
+
+  QString lastStatus() const { return m_lastStatus; }
+
+ signals:
+  void pingFinished(bool ok, QString message);
+  void lastStatusChanged();
+
+ private:
+  QString buildAuthQuery(const QString& user, const QString& password) const;
+  void setLastStatus(const QString& s);
+
+  QNetworkAccessManager m_manager;
+  QString m_lastStatus;
+};
+
+#endif