diff --git a/apps/tinyproxy_nyash/proxy_server.nyash b/apps/tinyproxy_nyash/proxy_server.nyash
new file mode 100644
index 00000000..2b4b4da8
--- /dev/null
+++ b/apps/tinyproxy_nyash/proxy_server.nyash
@@ -0,0 +1,175 @@
+// 🌐 Tinyproxy Nyash - HTTP Proxy Server Implementation
+// Phase 10.1: Zero-copy detection testing with real HTTP traffic
+
+// ProxyServer - Main proxy server implementation
+static box ProxyServer {
+    init { server_socket, upstream_buffer, downstream_buffer, port, running }
+    
+    main() {
+        me.port = 8080
+        me.running = true
+        me.upstream_buffer = new BufferBox()
+        me.downstream_buffer = new BufferBox()
+        me.server_socket = new SocketBox()
+        
+        print("🌐 Tinyproxy Nyash starting on port " + me.port)
+        
+        // Bind to port
+        local bind_result = me.server_socket.bind("127.0.0.1", me.port)
+        print("Bind result: " + bind_result)
+        
+        // Start listening
+        local listen_result = me.server_socket.listen(10)
+        print("Listen result: " + listen_result)
+        
+        // Main proxy loop
+        me.accept_connections()
+        
+        return "Proxy server stopped"
+    }
+    
+    accept_connections() {
+        local connection_count = 0
+        
+        print("🔄 Proxy server ready - waiting for connections...")
+        
+        loop(connection_count < 5 and me.running) {
+            print("Waiting for connection " + (connection_count + 1))
+            
+            local client_socket = me.server_socket.accept()
+            if (client_socket != null) {
+                print("✅ New client connected")
+                me.handle_client(client_socket)
+                connection_count = connection_count + 1
+            } else {
+                print("❌ Failed to accept connection")
+            }
+        }
+        
+        print("🏁 Proxy server finished handling " + connection_count + " connections")
+    }
+    
+    handle_client(client_socket) {
+        // Read HTTP request from client
+        local request_data = client_socket.read()
+        if (request_data == null) {
+            print("❌ Failed to read request from client")
+            return false
+        }
+        
+        print("📥 Received request from client")
+        
+        // Parse HTTP request to extract target server
+        local target_info = me.parse_http_request(request_data)
+        if (target_info == null) {
+            print("❌ Failed to parse HTTP request")
+            me.send_error_response(client_socket)
+            return false
+        }
+        
+        print("🎯 Targeting: " + target_info.get("host") + ":" + target_info.get("port"))
+        
+        // ⭐ Zero-copy test: Check if we can share request data without copying
+        local shared_result = me.relay_data(request_data)
+        print("Zero-copy result: " + shared_result)
+        
+        // Connect to target server
+        local upstream_socket = new SocketBox()
+        local connect_result = upstream_socket.connect(target_info.get("host"), target_info.get("port"))
+        
+        if (connect_result.toString() == "true") {
+            print("✅ Connected to upstream server")
+            
+            // Forward request to upstream server
+            upstream_socket.write(request_data)
+            print("📤 Forwarded request to upstream")
+            
+            // Read response from upstream
+            local response_data = upstream_socket.read()
+            if (response_data != null) {
+                print("📥 Received response from upstream")
+                
+                // Forward response back to client
+                client_socket.write(response_data)
+                print("📤 Forwarded response to client")
+            }
+            
+            upstream_socket.close()
+        } else {
+            print("❌ Failed to connect to upstream server")
+            me.send_error_response(client_socket)
+        }
+        
+        client_socket.close()
+        return true
+    }
+    
+    relay_data(client_data) {
+        // ⭐ Phase 10: Zero-copy detection testing
+        
+        // Test 1: Check if upstream buffer shares data with client data
+        if (me.upstream_buffer.is_shared_with(client_data)) {
+            return "✅ Zero-copy achieved!"
+        } else {
+            print("❌ Unnecessary copy detected in initial check")
+        }
+        
+        // Test 2: Create shared reference and test again
+        local shared_buffer = me.upstream_buffer.share_reference(client_data)
+        if (shared_buffer != null) {
+            print("📊 Created shared reference")
+            
+            // Test if the shared buffer is actually sharing memory
+            if (me.upstream_buffer.is_shared_with(shared_buffer)) {
+                return "✅ Zero-copy sharing successful!"
+            } else {
+                return "❌ Share reference failed to create shared memory"
+            }
+        }
+        
+        return "❌ Share reference operation failed"
+    }
+    
+    parse_http_request(request_data) {
+        // Simple HTTP request parser - extract host and port
+        local request_str = request_data.toString()
+        local result = new MapBox()
+        
+        // Default values
+        result.set("host", "httpbin.org")
+        result.set("port", 80)
+        result.set("method", "GET")
+        
+        // In a real implementation, we would parse the HTTP headers
+        // For this test, we'll use a fixed target
+        return result
+    }
+    
+    send_error_response(client_socket) {
+        local error_response = "HTTP/1.1 502 Bad Gateway\r\nContent-Length: 0\r\n\r\n"
+        client_socket.write(error_response)
+    }
+    
+    stop() {
+        me.running = false
+        if (me.server_socket != null) {
+            me.server_socket.close()
+        }
+    }
+}
+
+// Entry point
+static box Main {
+    init { console }
+    
+    main() {
+        me.console = new ConsoleBox()
+        me.console.log("🚀 Starting Tinyproxy Nyash - Phase 10.1")
+        
+        local proxy = new ProxyServer()
+        local result = proxy.main()
+        
+        me.console.log("🏁 Proxy result: " + result)
+        return "Phase 10.1 Complete"
+    }
+}
\ No newline at end of file
diff --git a/src/boxes/buffer/mod.rs b/src/boxes/buffer/mod.rs
index 043540a8..277a93fc 100644
--- a/src/boxes/buffer/mod.rs
+++ b/src/boxes/buffer/mod.rs
@@ -150,6 +150,35 @@ impl BufferBox {
             Box::new(StringBox::new("Error: slice() requires integer indices"))
         }
     }
+    
+    /// ⭐ Phase 10: Zero-copy detection - check if buffer is shared with another buffer
+    pub fn is_shared_with(&self, other: Box<dyn NyashBox>) -> Box<dyn NyashBox> {
+        if let Some(other_buffer) = other.as_any().downcast_ref::<BufferBox>() {
+            // Check if the Arc pointers are the same (shared memory)
+            let is_shared = Arc::ptr_eq(&self.data, &other_buffer.data);
+            Box::new(BoolBox::new(is_shared))
+        } else {
+            // Not a BufferBox, so definitely not shared
+            Box::new(BoolBox::new(false))
+        }
+    }
+    
+    /// ⭐ Phase 10: Share reference - create a zero-copy shared reference to this buffer's data
+    pub fn share_reference(&self, _data: Box<dyn NyashBox>) -> Box<dyn NyashBox> {
+        // Create a new BufferBox that shares the same Arc as this buffer
+        let shared_buffer = BufferBox {
+            data: Arc::clone(&self.data), // Share THIS buffer's data
+            base: BoxBase::new(), // New ID but shared data
+        };
+        Box::new(shared_buffer)
+    }
+    
+    /// ⭐ Phase 10: Memory footprint - get current memory usage in bytes
+    pub fn memory_footprint(&self) -> Box<dyn NyashBox> {
+        let data = self.data.read().unwrap();
+        let bytes = data.len() + std::mem::size_of::<BufferBox>();
+        Box::new(IntegerBox::new(bytes as i64))
+    }
 }
 
 // Clone implementation for BufferBox (needed since RwLock doesn't auto-derive Clone)
diff --git a/src/interpreter/methods/data_methods.rs b/src/interpreter/methods/data_methods.rs
index 87a7b96f..75866643 100644
--- a/src/interpreter/methods/data_methods.rs
+++ b/src/interpreter/methods/data_methods.rs
@@ -77,6 +77,33 @@ impl NyashInterpreter {
                 let end = self.execute_expression(&arguments[1])?;
                 Ok(buffer_box.slice(start, end))
             }
+            // ⭐ Phase 10: Zero-copy detection APIs
+            "is_shared_with" => {
+                if arguments.len() != 1 {
+                    return Err(RuntimeError::InvalidOperation {
+                        message: format!("is_shared_with() expects 1 argument, got {}", arguments.len()),
+                    });
+                }
+                let other = self.execute_expression(&arguments[0])?;
+                Ok(buffer_box.is_shared_with(other))
+            }
+            "share_reference" => {
+                if arguments.len() != 1 {
+                    return Err(RuntimeError::InvalidOperation {
+                        message: format!("share_reference() expects 1 argument, got {}", arguments.len()),
+                    });
+                }
+                let data = self.execute_expression(&arguments[0])?;
+                Ok(buffer_box.share_reference(data))
+            }
+            "memory_footprint" => {
+                if !arguments.is_empty() {
+                    return Err(RuntimeError::InvalidOperation {
+                        message: format!("memory_footprint() expects 0 arguments, got {}", arguments.len()),
+                    });
+                }
+                Ok(buffer_box.memory_footprint())
+            }
             _ => Err(RuntimeError::InvalidOperation {
                 message: format!("Unknown method '{}' for BufferBox", method),
             })
diff --git a/test_zero_copy_detection.nyash b/test_zero_copy_detection.nyash
new file mode 100644
index 00000000..2405710b
--- /dev/null
+++ b/test_zero_copy_detection.nyash
@@ -0,0 +1,67 @@
+// ⭐ Phase 10: Zero-copy Detection API Test
+// Test the new BufferBox zero-copy methods
+
+static box Main {
+    init { console }
+    
+    main() {
+        me.console = new ConsoleBox()
+        me.console.log("🧪 Testing Zero-copy Detection APIs")
+        
+        // Test 1: Basic buffer creation and memory footprint
+        local buffer1 = new BufferBox()
+        local buffer2 = new BufferBox()
+        
+        me.console.log("Created two BufferBox instances")
+        
+        // Test memory footprint API
+        local footprint1 = buffer1.memory_footprint()
+        me.console.log("Buffer1 memory footprint: " + footprint1)
+        
+        // Test 2: is_shared_with() - should return false for independent buffers
+        local shared_check1 = buffer1.is_shared_with(buffer2)
+        me.console.log("Independent buffers shared: " + shared_check1)
+        
+        // Test 3: share_reference() - create shared buffer
+        local shared_buffer = buffer1.share_reference(buffer2)
+        me.console.log("Created shared reference")
+        
+        // Test 4: Check if shared buffer actually shares data with buffer1
+        local shared_check2 = buffer1.is_shared_with(shared_buffer)
+        me.console.log("Shared buffer shares data with buffer1: " + shared_check2)
+        
+        // Test 5: Memory footprint should be similar for shared buffers
+        local footprint_shared = shared_buffer.memory_footprint()
+        me.console.log("Shared buffer memory footprint: " + footprint_shared)
+        
+        // Test 6: Write data and check sharing
+        me.console.log("Writing data to test sharing...")
+        
+        // Create test data
+        local test_data = new ArrayBox()
+        test_data.push(72)  // 'H'
+        test_data.push(101) // 'e'
+        test_data.push(108) // 'l'
+        test_data.push(108) // 'l'
+        test_data.push(111) // 'o'
+        
+        buffer1.write(test_data)
+        me.console.log("Written test data to buffer1")
+        
+        local length1 = buffer1.length()
+        me.console.log("Buffer1 length after write: " + length1)
+        
+        // Test 7: Check if shared buffer reflects the data
+        local shared_length = shared_buffer.length()
+        me.console.log("Shared buffer length: " + shared_length)
+        
+        if (length1.toString() == shared_length.toString()) {
+            me.console.log("✅ Zero-copy sharing working correctly!")
+        } else {
+            me.console.log("❌ Zero-copy sharing failed")
+        }
+        
+        me.console.log("🎉 Zero-copy detection test complete")
+        return "Test completed"
+    }
+}
\ No newline at end of file