diff --git a/tradingagents/dataflows/alpha_vantage_common.py b/tradingagents/dataflows/alpha_vantage_common.py
index f8cc9749..409ff29e 100644
--- a/tradingagents/dataflows/alpha_vantage_common.py
+++ b/tradingagents/dataflows/alpha_vantage_common.py
@@ -1,6 +1,7 @@
 import os
 import requests
 import pandas as pd
+import json
 from datetime import datetime
 from io import StringIO
 
@@ -34,9 +35,15 @@ def format_datetime_for_api(date_input) -> str:
     else:
         raise ValueError(f"Date must be string or datetime object, got {type(date_input)}")
 
+class AlphaVantageRateLimitError(Exception):
+    """Exception raised when Alpha Vantage API rate limit is exceeded."""
+    pass
+
 def _make_api_request(function_name: str, params: dict) -> dict | str:
     """Helper function to make API requests and handle responses.
     
+    Raises:
+        AlphaVantageRateLimitError: When API rate limit is exceeded
     """
     # Create a copy of params to avoid modifying the original
     api_params = params.copy()
@@ -60,6 +67,18 @@ def _make_api_request(function_name: str, params: dict) -> dict | str:
     response.raise_for_status()
 
     response_text = response.text
+    
+    # Check if response is JSON (error responses are typically JSON)
+    try:
+        response_json = json.loads(response_text)
+        # Check for rate limit error
+        if "Information" in response_json:
+            info_message = response_json["Information"]
+            if "rate limit" in info_message.lower() or "api key" in info_message.lower():
+                raise AlphaVantageRateLimitError(f"Alpha Vantage rate limit exceeded: {info_message}")
+    except json.JSONDecodeError:
+        # Response is not JSON (likely CSV data), which is normal
+        pass
 
     return response_text
 
diff --git a/tradingagents/dataflows/interface.py b/tradingagents/dataflows/interface.py
index bc65df9c..4cd5ddef 100644
--- a/tradingagents/dataflows/interface.py
+++ b/tradingagents/dataflows/interface.py
@@ -2,7 +2,7 @@ from typing import Annotated
 
 # Import from vendor-specific modules
 from .local import get_YFin_data, get_finnhub_news, get_finnhub_company_insider_sentiment, get_finnhub_company_insider_transactions, get_simfin_balance_sheet, get_simfin_cashflow, get_simfin_income_statements, get_reddit_global_news, get_reddit_company_news
-from .y_finance import get_YFin_data_online, get_stock_stats_indicators_window
+from .y_finance import get_YFin_data_online, get_stock_stats_indicators_window, get_balance_sheet as get_yfinance_balance_sheet, get_cashflow as get_yfinance_cashflow, get_income_statement as get_yfinance_income_statement, get_insider_transactions as get_yfinance_insider_transactions
 from .google import get_google_news
 from .openai import get_stock_news_openai, get_global_news_openai, get_fundamentals_openai
 from .alpha_vantage import (
@@ -15,6 +15,7 @@ from .alpha_vantage import (
     get_insider_transactions as get_alpha_vantage_insider_transactions,
     get_news as get_alpha_vantage_news
 )
+from .alpha_vantage_common import AlphaVantageRateLimitError
 
 # Configuration and routing logic
 from .config import get_config
@@ -81,14 +82,17 @@ VENDOR_METHODS = {
     },
     "get_balance_sheet": {
         "alpha_vantage": get_alpha_vantage_balance_sheet,
+        "yfinance": get_yfinance_balance_sheet,
         "local": get_simfin_balance_sheet,
     },
     "get_cashflow": {
         "alpha_vantage": get_alpha_vantage_cashflow,
+        "yfinance": get_yfinance_cashflow,
         "local": get_simfin_cashflow,
     },
     "get_income_statement": {
         "alpha_vantage": get_alpha_vantage_income_statement,
+        "yfinance": get_yfinance_income_statement,
         "local": get_simfin_income_statements,
     },
     # news_data
@@ -107,6 +111,7 @@ VENDOR_METHODS = {
     },
     "get_insider_transactions": {
         "alpha_vantage": get_alpha_vantage_insider_transactions,
+        "yfinance": get_yfinance_insider_transactions,
         "local": get_finnhub_company_insider_transactions,
     },
 }
@@ -134,42 +139,102 @@ def get_vendor(category: str, method: str = None) -> str:
     return config.get("data_vendors", {}).get(category, "default")
 
 def route_to_vendor(method: str, *args, **kwargs):
-    """Route method calls to appropriate vendor implementation."""
+    """Route method calls to appropriate vendor implementation with fallback support."""
     category = get_category_for_method(method)
     vendor_config = get_vendor(category, method)
 
     # Handle comma-separated vendors
-    vendors = [v.strip() for v in vendor_config.split(',')]
+    primary_vendors = [v.strip() for v in vendor_config.split(',')]
 
     if method not in VENDOR_METHODS:
         raise ValueError(f"Method '{method}' not supported")
 
-    # Collect all methods to run
-    methods_to_run = []
+    # Get all available vendors for this method for fallback
+    all_available_vendors = list(VENDOR_METHODS[method].keys())
+    
+    # Create fallback vendor list: primary vendors first, then remaining vendors as fallbacks
+    fallback_vendors = primary_vendors.copy()
+    for vendor in all_available_vendors:
+        if vendor not in fallback_vendors:
+            fallback_vendors.append(vendor)
 
-    for vendor in vendors:
+    # Debug: Print fallback ordering
+    primary_str = " → ".join(primary_vendors)
+    fallback_str = " → ".join(fallback_vendors)
+    print(f"DEBUG: {method} - Primary: [{primary_str}] | Full fallback order: [{fallback_str}]")
+
+    # Track results and execution state
+    results = []
+    vendor_attempt_count = 0
+    any_primary_vendor_attempted = False
+    successful_vendor = None
+
+    for vendor in fallback_vendors:
         if vendor not in VENDOR_METHODS[method]:
-            print(f"Info: Vendor '{vendor}' not supported for method '{method}', ignoring")
+            if vendor in primary_vendors:
+                print(f"INFO: Vendor '{vendor}' not supported for method '{method}', falling back to next vendor")
             continue
 
         vendor_impl = VENDOR_METHODS[method][vendor]
+        is_primary_vendor = vendor in primary_vendors
+        vendor_attempt_count += 1
+
+        # Track if we attempted any primary vendor
+        if is_primary_vendor:
+            any_primary_vendor_attempted = True
+
+        # Debug: Print current attempt
+        vendor_type = "PRIMARY" if is_primary_vendor else "FALLBACK"
+        print(f"DEBUG: Attempting {vendor_type} vendor '{vendor}' for {method} (attempt #{vendor_attempt_count})")
 
         # Handle list of methods for a vendor
         if isinstance(vendor_impl, list):
-            methods_to_run.extend(vendor_impl)
+            vendor_methods = [(impl, vendor) for impl in vendor_impl]
+            print(f"DEBUG: Vendor '{vendor}' has multiple implementations: {len(vendor_methods)} functions")
         else:
-            # Single method implementation
-            methods_to_run.append(vendor_impl)
+            vendor_methods = [(vendor_impl, vendor)]
 
-    # Run all methods and collect results
-    results = []
-    for impl_func in methods_to_run:
-        try:
-            result = impl_func(*args, **kwargs)
-            results.append(result)
-        except Exception as e:
-            # Log error but continue with other implementations
-            print(f"Warning: {impl_func.__name__} failed: {e}")
+        # Run methods for this vendor
+        vendor_results = []
+        for impl_func, vendor_name in vendor_methods:
+            try:
+                print(f"DEBUG: Calling {impl_func.__name__} from vendor '{vendor_name}'...")
+                result = impl_func(*args, **kwargs)
+                vendor_results.append(result)
+                print(f"SUCCESS: {impl_func.__name__} from vendor '{vendor_name}' completed successfully")
+                    
+            except AlphaVantageRateLimitError as e:
+                if vendor == "alpha_vantage":
+                    print(f"RATE_LIMIT: Alpha Vantage rate limit exceeded, falling back to next available vendor")
+                    print(f"DEBUG: Rate limit details: {e}")
+                # Continue to next vendor for fallback
+                continue
+            except Exception as e:
+                # Log error but continue with other implementations
+                print(f"FAILED: {impl_func.__name__} from vendor '{vendor_name}' failed: {e}")
+                continue
+
+        # Add this vendor's results
+        if vendor_results:
+            results.extend(vendor_results)
+            successful_vendor = vendor
+            result_summary = f"Got {len(vendor_results)} result(s)"
+            print(f"SUCCESS: Vendor '{vendor}' succeeded - {result_summary}")
+            
+            # Stopping logic: Stop after first successful vendor for single-vendor configs
+            # Multiple vendor configs (comma-separated) may want to collect from multiple sources
+            if len(primary_vendors) == 1:
+                print(f"DEBUG: Stopping after successful vendor '{vendor}' (single-vendor config)")
+                break
+        else:
+            print(f"FAILED: Vendor '{vendor}' produced no results")
+
+    # Final result summary
+    if not results:
+        print(f"FAILURE: All {vendor_attempt_count} vendor attempts failed for method '{method}'")
+        raise RuntimeError(f"All vendor implementations failed for method '{method}'")
+    else:
+        print(f"FINAL: Method '{method}' completed with {len(results)} result(s) from {vendor_attempt_count} vendor attempt(s)")
 
     # Return single result if only one, otherwise concatenate as string
     if len(results) == 1:
diff --git a/tradingagents/dataflows/y_finance.py b/tradingagents/dataflows/y_finance.py
index 049403cb..76b6cf4d 100644
--- a/tradingagents/dataflows/y_finance.py
+++ b/tradingagents/dataflows/y_finance.py
@@ -181,4 +181,118 @@ def get_stockstats_indicator(
         )
         return ""
 
-    return str(indicator_value)
\ No newline at end of file
+    return str(indicator_value)
+
+
+def get_balance_sheet(
+    ticker: Annotated[str, "ticker symbol of the company"],
+    freq: Annotated[str, "frequency of data: 'annual' or 'quarterly'"] = "quarterly",
+    curr_date: Annotated[str, "current date (not used for yfinance)"] = None
+):
+    """Get balance sheet data from yfinance."""
+    try:
+        ticker_obj = yf.Ticker(ticker.upper())
+        
+        if freq.lower() == "quarterly":
+            data = ticker_obj.quarterly_balance_sheet
+        else:
+            data = ticker_obj.balance_sheet
+            
+        if data.empty:
+            return f"No balance sheet data found for symbol '{ticker}'"
+            
+        # Convert to CSV string for consistency with other functions
+        csv_string = data.to_csv()
+        
+        # Add header information
+        header = f"# Balance Sheet data for {ticker.upper()} ({freq})\n"
+        header += f"# Data retrieved on: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}\n\n"
+        
+        return header + csv_string
+        
+    except Exception as e:
+        return f"Error retrieving balance sheet for {ticker}: {str(e)}"
+
+
+def get_cashflow(
+    ticker: Annotated[str, "ticker symbol of the company"],
+    freq: Annotated[str, "frequency of data: 'annual' or 'quarterly'"] = "quarterly",
+    curr_date: Annotated[str, "current date (not used for yfinance)"] = None
+):
+    """Get cash flow data from yfinance."""
+    try:
+        ticker_obj = yf.Ticker(ticker.upper())
+        
+        if freq.lower() == "quarterly":
+            data = ticker_obj.quarterly_cashflow
+        else:
+            data = ticker_obj.cashflow
+            
+        if data.empty:
+            return f"No cash flow data found for symbol '{ticker}'"
+            
+        # Convert to CSV string for consistency with other functions
+        csv_string = data.to_csv()
+        
+        # Add header information
+        header = f"# Cash Flow data for {ticker.upper()} ({freq})\n"
+        header += f"# Data retrieved on: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}\n\n"
+        
+        return header + csv_string
+        
+    except Exception as e:
+        return f"Error retrieving cash flow for {ticker}: {str(e)}"
+
+
+def get_income_statement(
+    ticker: Annotated[str, "ticker symbol of the company"],
+    freq: Annotated[str, "frequency of data: 'annual' or 'quarterly'"] = "quarterly",
+    curr_date: Annotated[str, "current date (not used for yfinance)"] = None
+):
+    """Get income statement data from yfinance."""
+    try:
+        ticker_obj = yf.Ticker(ticker.upper())
+        
+        if freq.lower() == "quarterly":
+            data = ticker_obj.quarterly_income_stmt
+        else:
+            data = ticker_obj.income_stmt
+            
+        if data.empty:
+            return f"No income statement data found for symbol '{ticker}'"
+            
+        # Convert to CSV string for consistency with other functions
+        csv_string = data.to_csv()
+        
+        # Add header information
+        header = f"# Income Statement data for {ticker.upper()} ({freq})\n"
+        header += f"# Data retrieved on: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}\n\n"
+        
+        return header + csv_string
+        
+    except Exception as e:
+        return f"Error retrieving income statement for {ticker}: {str(e)}"
+
+
+def get_insider_transactions(
+    ticker: Annotated[str, "ticker symbol of the company"]
+):
+    """Get insider transactions data from yfinance."""
+    try:
+        ticker_obj = yf.Ticker(ticker.upper())
+        data = ticker_obj.insider_transactions
+        
+        if data is None or data.empty:
+            return f"No insider transactions data found for symbol '{ticker}'"
+            
+        # Convert to CSV string for consistency with other functions
+        csv_string = data.to_csv()
+        
+        # Add header information
+        header = f"# Insider Transactions data for {ticker.upper()}\n"
+        header += f"# Data retrieved on: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}\n\n"
+        
+        return header + csv_string
+        
+    except Exception as e:
+        return f"Error retrieving insider transactions for {ticker}: {str(e)}"
\ No newline at end of file