diff --git a/services/blockchain_simple.py b/services/blockchain_simple.py
index 6dc6c219..112b073b 100755
--- a/services/blockchain_simple.py
+++ b/services/blockchain_simple.py
@@ -41,7 +41,7 @@ def main():
             # Run the blockchain FastAPI app
             import uvicorn
             logger.info("Starting blockchain FastAPI app on port 8545")
-            uvicorn.run(app, host="0.0.0.0", port=8545)
+            uvicorn.run(app, host="0.0.0.0", port=int(os.environ.get("BLOCKCHAIN_PORT", 8545)))
             
         except ImportError as e:
             logger.error(f"Failed to import blockchain app: {e}")
@@ -126,7 +126,7 @@ def basic_blockchain_node():
         activity_thread.start()
         
         logger.info("Starting basic blockchain API on port 8545")
-        uvicorn.run(app, host="0.0.0.0", port=8545)
+        uvicorn.run(app, host="0.0.0.0", port=int(os.environ.get("BLOCKCHAIN_PORT", 8545)))
         
     except ImportError:
         # Fallback to simple heartbeat