diff --git a/network_stats.py b/network_stats.py
new file mode 100644
index 0000000..a05a77d
--- /dev/null
+++ b/network_stats.py
@@ -0,0 +1,157 @@
+# -*- coding: utf-8 -*-
+"""Thread-safe network statistics tracking."""
+
+import threading
+import time
+
+class NetworkStats(object):
+    """Track network bytes sent/received with thread-safe counters."""
+
+    def __init__(self):
+        self._lock = threading.Lock()
+        self._bytes_rx = 0
+        self._bytes_tx = 0
+        self._requests = 0
+        self._start_time = time.time()
+        # Per-category stats
+        self._scraper_rx = 0
+        self._scraper_tx = 0
+        self._proxy_rx = 0
+        self._proxy_tx = 0
+        # Per-tor-node stats: {host:port -> {'rx': n, 'tx': n, 'requests': n}}
+        self._tor_stats = {}
+
+    def add_rx(self, nbytes, category='other', tor_node=None):
+        """Add received bytes."""
+        with self._lock:
+            self._bytes_rx += nbytes
+            if category == 'scraper':
+                self._scraper_rx += nbytes
+            elif category == 'proxy':
+                self._proxy_rx += nbytes
+            if tor_node:
+                if tor_node not in self._tor_stats:
+                    self._tor_stats[tor_node] = {'rx': 0, 'tx': 0, 'requests': 0}
+                self._tor_stats[tor_node]['rx'] += nbytes
+
+    def add_tx(self, nbytes, category='other', tor_node=None):
+        """Add transmitted bytes."""
+        with self._lock:
+            self._bytes_tx += nbytes
+            if category == 'scraper':
+                self._scraper_tx += nbytes
+            elif category == 'proxy':
+                self._proxy_tx += nbytes
+            if tor_node:
+                if tor_node not in self._tor_stats:
+                    self._tor_stats[tor_node] = {'rx': 0, 'tx': 0, 'requests': 0}
+                self._tor_stats[tor_node]['tx'] += nbytes
+
+    def add_request(self, tor_node=None):
+        """Increment request counter."""
+        with self._lock:
+            self._requests += 1
+            if tor_node:
+                if tor_node not in self._tor_stats:
+                    self._tor_stats[tor_node] = {'rx': 0, 'tx': 0, 'requests': 0}
+                self._tor_stats[tor_node]['requests'] += 1
+
+    def get_stats(self):
+        """Return current stats as dict."""
+        with self._lock:
+            elapsed = time.time() - self._start_time
+            rx_rate = self._bytes_rx / elapsed if elapsed > 0 else 0
+            tx_rate = self._bytes_tx / elapsed if elapsed > 0 else 0
+            return {
+                'bytes_rx': self._bytes_rx,
+                'bytes_tx': self._bytes_tx,
+                'bytes_total': self._bytes_rx + self._bytes_tx,
+                'requests': self._requests,
+                'elapsed': elapsed,
+                'rx_rate': rx_rate,
+                'tx_rate': tx_rate,
+                'scraper': {
+                    'bytes_rx': self._scraper_rx,
+                    'bytes_tx': self._scraper_tx,
+                    'bytes_total': self._scraper_rx + self._scraper_tx,
+                },
+                'proxy': {
+                    'bytes_rx': self._proxy_rx,
+                    'bytes_tx': self._proxy_tx,
+                    'bytes_total': self._proxy_rx + self._proxy_tx,
+                },
+                'tor_nodes': dict(self._tor_stats),
+            }
+
+    def reset(self):
+        """Reset all counters."""
+        with self._lock:
+            self._bytes_rx = 0
+            self._bytes_tx = 0
+            self._requests = 0
+            self._scraper_rx = 0
+            self._scraper_tx = 0
+            self._proxy_rx = 0
+            self._proxy_tx = 0
+            self._tor_stats = {}
+            self._start_time = time.time()
+
+
+# Global singleton
+_stats = NetworkStats()
+
+# Thread-local context for category and tor_node tracking
+_context = threading.local()
+
+
+def set_category(category):
+    """Set the current category for this thread (scraper, proxy, or other)."""
+    _context.category = category
+
+
+def get_category():
+    """Get the current category for this thread."""
+    return getattr(_context, 'category', 'other')
+
+
+def set_tor_node(tor_node):
+    """Set the current Tor node for this thread (host:port)."""
+    _context.tor_node = tor_node
+
+
+def get_tor_node():
+    """Get the current Tor node for this thread."""
+    return getattr(_context, 'tor_node', None)
+
+
+def add_rx(nbytes, category=None, tor_node=None):
+    """Add received bytes. Uses thread-local context if not specified."""
+    if category is None:
+        category = get_category()
+    if tor_node is None:
+        tor_node = get_tor_node()
+    _stats.add_rx(nbytes, category, tor_node)
+
+
+def add_tx(nbytes, category=None, tor_node=None):
+    """Add transmitted bytes. Uses thread-local context if not specified."""
+    if category is None:
+        category = get_category()
+    if tor_node is None:
+        tor_node = get_tor_node()
+    _stats.add_tx(nbytes, category, tor_node)
+
+
+def add_request(tor_node=None):
+    """Increment request counter."""
+    if tor_node is None:
+        tor_node = get_tor_node()
+    _stats.add_request(tor_node)
+
+
+def get_stats():
+    return _stats.get_stats()
+
+
+def reset():
+    _stats.reset()