diff --git a/examples/basic_mcp_usage.py b/examples/basic_mcp_usage.py
index 0534fba9..a9d66609 100644
--- a/examples/basic_mcp_usage.py
+++ b/examples/basic_mcp_usage.py
@@ -9,16 +9,21 @@
 
 Usage:
     python examples/basic_mcp_usage.py
+
+Set SELLER_BASE_URL to use a server other than http://localhost:8000.
 """
 
 import asyncio
+import os
 
 from ad_buyer.clients import Protocol, UnifiedClient
 
+SELLER_BASE_URL = os.getenv("SELLER_BASE_URL", "http://localhost:8000")
+
 
 async def main():
     # MCP mode - direct tool calls (faster, deterministic)
-    async with UnifiedClient(protocol=Protocol.MCP) as client:
+    async with UnifiedClient(base_url=SELLER_BASE_URL, protocol=Protocol.MCP) as client:
         # List available products
         result = await client.list_products()
         print(f"Products: {result.data}")
diff --git a/examples/dsp_deal_discovery.py b/examples/dsp_deal_discovery.py
index 42761d84..018dc416 100644
--- a/examples/dsp_deal_discovery.py
+++ b/examples/dsp_deal_discovery.py
@@ -17,11 +17,16 @@
     cd ad_buyer_system
     pip install -e .
     python examples/dsp_deal_discovery.py
+
+Set SELLER_BASE_URL to use a server other than http://localhost:8000.
 """
 
 import asyncio
+import os
 import sys
 
+SELLER_BASE_URL = os.getenv("SELLER_BASE_URL", "http://localhost:8000")
+
 try:
     from ad_buyer.clients.unified_client import UnifiedClient
     from ad_buyer.models.buyer_identity import (
@@ -110,7 +115,7 @@ async def demo_dsp_workflow():
     print(f"  Premium Access: {buyer_context.can_access_premium_inventory()}")
 
     # Connect to IAB Tech Lab server
-    async with UnifiedClient(buyer_identity=identity) as client:
+    async with UnifiedClient(base_url=SELLER_BASE_URL, buyer_identity=identity) as client:
         print("\n" + "-" * 40)
         print("Step 1: Discover Inventory")
         print("-" * 40)
@@ -192,7 +197,7 @@ async def demo_unified_client_dsp_methods():
     )
 
     # Create client with identity
-    async with UnifiedClient(buyer_identity=identity) as client:
+    async with UnifiedClient(base_url=SELLER_BASE_URL, buyer_identity=identity) as client:
         print(f"\nAccess Tier: {client.get_access_tier()}")
 
         # Discover inventory
diff --git a/examples/individual_clients.py b/examples/individual_clients.py
index 1872f67b..52f08c9b 100644
--- a/examples/individual_clients.py
+++ b/examples/individual_clients.py
@@ -9,12 +9,17 @@
 
 Usage:
     python examples/individual_clients.py
+
+Set SELLER_BASE_URL to use a server other than http://localhost:8000.
 """
 
 import asyncio
+import os
 
 from ad_buyer.clients import A2AClient, IABMCPClient
 
+SELLER_BASE_URL = os.getenv("SELLER_BASE_URL", "http://localhost:8000")
+
 
 async def mcp_example():
     """Direct MCP client usage."""
@@ -22,7 +27,7 @@ async def mcp_example():
     print("MCP Client - Direct Tool Access")
     print("=" * 50)
 
-    async with IABMCPClient() as client:
+    async with IABMCPClient(base_url=SELLER_BASE_URL) as client:
         # See all available tools
         print(f"Available tools: {len(client.tools)}")
         for tool in client.tools[:5]:  # Show first 5
@@ -42,7 +47,7 @@ async def a2a_example():
     print("A2A Client - Natural Language")
     print("=" * 50)
 
-    async with A2AClient() as client:
+    async with A2AClient(base_url=SELLER_BASE_URL) as client:
         # Send natural language messages
         response = await client.send_message("List available products")
         print(f"Response text: {response.text}")
diff --git a/examples/natural_language_a2a.py b/examples/natural_language_a2a.py
index f01b35ac..69349a2f 100644
--- a/examples/natural_language_a2a.py
+++ b/examples/natural_language_a2a.py
@@ -9,15 +9,20 @@
 
 Usage:
     python examples/natural_language_a2a.py
+
+Set SELLER_BASE_URL to use a server other than http://localhost:8000.
 """
 
 import asyncio
+import os
 
 from ad_buyer.clients import Protocol, UnifiedClient
 
+SELLER_BASE_URL = os.getenv("SELLER_BASE_URL", "http://localhost:8000")
+
 
 async def main():
-    async with UnifiedClient(protocol=Protocol.A2A) as client:
+    async with UnifiedClient(base_url=SELLER_BASE_URL, protocol=Protocol.A2A) as client:
         # Natural language queries
         result = await client.send_natural_language(
             "Find CTV inventory with household targeting under $30 CPM"
diff --git a/examples/protocol_switching.py b/examples/protocol_switching.py
index 55c74961..ccc19bb0 100644
--- a/examples/protocol_switching.py
+++ b/examples/protocol_switching.py
@@ -9,15 +9,20 @@
 
 Usage:
     python examples/protocol_switching.py
+
+Set SELLER_BASE_URL to use a server other than http://localhost:8000.
 """
 
 import asyncio
+import os
 
 from ad_buyer.clients import Protocol, UnifiedClient
 
+SELLER_BASE_URL = os.getenv("SELLER_BASE_URL", "http://localhost:8000")
+
 
 async def main():
-    async with UnifiedClient(protocol=Protocol.MCP) as client:
+    async with UnifiedClient(base_url=SELLER_BASE_URL, protocol=Protocol.MCP) as client:
         # Connect to both protocols
         await client.connect_both()
         print("Connected to both MCP and A2A protocols")