diff --git a/tradingagents/default_config.py b/tradingagents/default_config.py
index ecf0dc29..c70ba098 100644
--- a/tradingagents/default_config.py
+++ b/tradingagents/default_config.py
@@ -13,22 +13,31 @@ DEFAULT_CONFIG = {
     "quick_think_llm": "gpt-5-mini",
     "backend_url": "https://api.openai.com/v1",
     # Provider-specific thinking configuration
-    "google_thinking_level": None,      # "high", "minimal", etc.
-    "openai_reasoning_effort": None,    # "medium", "high", "low"
+    "google_thinking_level": None, # "high", "minimal", etc.
+    "openai_reasoning_effort": None, # "medium", "high", "low"
     # Debate and discussion settings
     "max_debate_rounds": 1,
     "max_risk_discuss_rounds": 1,
     "max_recur_limit": 100,
-    # Data vendor configuration
-    # Category-level configuration (default for all tools in category)
+    # Data vendor configuration (Stock/TradFi)
     "data_vendors": {
-        "core_stock_apis": "yfinance",       # Options: alpha_vantage, yfinance
-        "technical_indicators": "yfinance",  # Options: alpha_vantage, yfinance
-        "fundamental_data": "yfinance",      # Options: alpha_vantage, yfinance
-        "news_data": "yfinance",             # Options: alpha_vantage, yfinance
+        "core_stock_apis": "yfinance", # Options: alpha_vantage, yfinance
+        "technical_indicators": "yfinance", # Options: alpha_vantage, yfinance
+        "fundamental_data": "yfinance", # Options: alpha_vantage, yfinance
+        "news_data": "yfinance", # Options: alpha_vantage, yfinance
+        # DEX/Crypto data vendors (Phase 1-3)
+        "core_token_apis": "coingecko",
+        "token_info": "coingecko",
+        "technical_indicators_dex": "coingecko",
+        "defi_fundamentals": "defillama",  # Phase 2
+        "whale_tracking": "birdeye",  # Phase 3
     },
     # Tool-level configuration (takes precedence over category-level)
     "tool_vendors": {
-        # Example: "get_stock_data": "alpha_vantage",  # Override category default
+        # Example: "get_stock_data": "alpha_vantage", # Override category default
     },
-}
+    # Trading mode: "stock" (TradFi) or "dex" (DeFi/Crypto)
+    "trading_mode": "stock",
+    # Default blockchain for DEX operations
+    "default_chain": "solana",  # Options: solana, ethereum, bsc, arbitrum, etc.
+}
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