diff --git a/src/main/java/com/tribufu/TribufuApi.java b/src/main/java/com/tribufu/TribufuApi.java
new file mode 100644
index 0000000..ff84940
--- /dev/null
+++ b/src/main/java/com/tribufu/TribufuApi.java
@@ -0,0 +1,158 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+// SPDX-License-Identifier: MIT
+
+package com.tribufu;
+
+import com.tribufu.generated.api.TribufuGeneratedApi;
+import com.tribufu.generated.ApiClient;
+
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
+import java.util.Optional;
+
+/**
+ * Tribufu API
+ *
+ * Use this class to interact with the Tribufu API.
+ */
+public class TribufuApi extends TribufuGeneratedApi {
+    /**
+     * The default base URL for the Tribufu API.
+     */
+    public static final String DEFAULT_BASE_URL = "https://api.tribufu.com";
+
+    /**
+     * Create a TribufuApi with no API key (public access).
+     */
+    public TribufuApi() {
+        this("");
+    }
+
+    /**
+     * Create a TribufuApi with the given API key.
+     *
+     * @param apiKey The API key for authentication.
+     */
+    public TribufuApi(String apiKey) {
+        super(createClient(apiKey));
+    }
+
+    /**
+     * Create a default TribufuApi instance.
+     *
+     * @return TribufuApi instance with default config.
+     */
+    public static TribufuApi defaultInstance() {
+        return new TribufuApi();
+    }
+
+    /**
+     * Create a TribufuApi with the given API key.
+     *
+     * @param apiKey The API key.
+     * @return TribufuApi instance.
+     */
+    public static TribufuApi withApiKey(String apiKey) {
+        return new TribufuApi(apiKey);
+    }
+
+    /**
+     * Create a TribufuApi from environment variables (e.g., TRIBUFU_API_KEY).
+     *
+     * @param prefix Optional prefix for env vars (default: TRIBUFU).
+     * @return TribufuApi instance or null.
+     */
+    public static TribufuApi fromEnv(String prefix) {
+        if (prefix == null || prefix.isEmpty()) {
+            prefix = "TRIBUFU";
+        }
+
+        String apiKey = System.getenv(prefix + "_API_KEY");
+        if (apiKey != null && !apiKey.isEmpty()) {
+            return withApiKey(apiKey);
+        }
+
+        return null;
+    }
+
+    /**
+     * Create a TribufuApi from env vars or fallback to default instance.
+     *
+     * @param prefix Optional env var prefix (default: TRIBUFU).
+     * @return TribufuApi instance.
+     */
+    public static TribufuApi fromEnvOrDefault(String prefix) {
+        TribufuApi fromEnv = fromEnv(prefix);
+        return (fromEnv != null) ? fromEnv : defaultInstance();
+    }
+
+    /**
+     * Create a TribufuApi from env vars or fallback to default instance.
+     *
+     * @return TribufuApi instance.
+     */
+    public static TribufuApi fromEnvOrDefault() {
+        return fromEnvOrDefault("TRIBUFU");
+    }
+
+    /**
+     * Creates and configures the ApiClient.
+     */
+    private static ApiClient createClient(String apiKey) {
+        ApiClient client = new ApiClient();
+
+        client.setBasePath(getBaseUrl());
+
+        try {
+            client.setUserAgent(urlEncode(getUserAgent()));
+        } catch (UnsupportedEncodingException e) {
+        }
+
+        if (apiKey != null && !apiKey.isEmpty()) {
+            client.addDefaultHeader("Authorization", "ApiKey " + apiKey);
+        }
+
+        return client;
+    }
+
+    /**
+     * Get the base URL, uses TRIBUFU_API_URL if debug mode is on.
+     */
+    private static String getBaseUrl() {
+        String debug = System.getenv("DEBUG");
+        String envUrl = System.getenv("TRIBUFU_API_URL");
+
+        if ("1".equals(debug) || "true".equalsIgnoreCase(debug)) {
+            if (envUrl != null && !envUrl.isEmpty()) {
+                return envUrl;
+            }
+        }
+
+        return DEFAULT_BASE_URL;
+    }
+
+    /**
+     * Get the version of the Tribufu client.
+     */
+    public static String getVersion() {
+        Package pkg = TribufuApi.class.getPackage();
+        String version = Optional.ofNullable(pkg.getImplementationVersion()).orElse("dev");
+        return version;
+    }
+
+    /**
+     * Get the User-Agent string for the API.
+     */
+    private static String getUserAgent() {
+        String version = getVersion();
+        String os = System.getProperty("os.name");
+        String arch = System.getProperty("os.arch");
+        String javaVersion = System.getProperty("java.version");
+        return String.format("Tribufu/%s (Java %s; %s; %s)", version, javaVersion, os, arch);
+    }
+
+    private static String urlEncode(String value) throws UnsupportedEncodingException {
+        return URLEncoder.encode(value, StandardCharsets.UTF_8.toString());
+    }
+}
diff --git a/src/main/java/com/tribufu/TribufuApiSingleton.java b/src/main/java/com/tribufu/TribufuApiSingleton.java
new file mode 100644
index 0000000..3491c60
--- /dev/null
+++ b/src/main/java/com/tribufu/TribufuApiSingleton.java
@@ -0,0 +1,36 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+// SPDX-License-Identifier: MIT
+
+package com.tribufu;
+
+/**
+ * Tribufu API
+ *
+ * Helper class to get a singleton instance of the Tribufu API.
+ */
+public final class TribufuApiSingleton {
+    private static TribufuApi instance = null;
+
+    private TribufuApiSingleton() {
+    }
+
+    /**
+     * Get the singleton instance of {@link TribufuApi}.
+     *
+     * @return Singleton instance
+     */
+    public static synchronized TribufuApi getInstance() {
+        if (instance == null) {
+            instance = TribufuApi.fromEnvOrDefault();
+        }
+
+        return instance;
+    }
+
+    /**
+     * Reset the singleton instance of {@link TribufuApi}.
+     */
+    public static synchronized void resetInstance() {
+        instance = null;
+    }
+}