diff --git a/store/ai_model.go b/store/ai_model.go
index 37be8a54..b59498ed 100644
--- a/store/ai_model.go
+++ b/store/ai_model.go
@@ -204,16 +204,25 @@ func (s *AIModelStore) firstEnabled(userID string) (*AIModel, error) {
 }
 
 // Update updates AI model, creates if not exists
+// IMPORTANT: If apiKey is empty string, the existing API key will be preserved (not overwritten)
 func (s *AIModelStore) Update(userID, id string, enabled bool, apiKey, customAPIURL, customModelName string) error {
 	// Try exact ID match first
 	var existingID string
 	err := s.db.QueryRow(`SELECT id FROM ai_models WHERE user_id = ? AND id = ? LIMIT 1`, userID, id).Scan(&existingID)
 	if err == nil {
-		encryptedAPIKey := s.encrypt(apiKey)
-		_, err = s.db.Exec(`
-			UPDATE ai_models SET enabled = ?, api_key = ?, custom_api_url = ?, custom_model_name = ?, updated_at = datetime('now')
-			WHERE id = ? AND user_id = ?
-		`, enabled, encryptedAPIKey, customAPIURL, customModelName, existingID, userID)
+		// If apiKey is empty, preserve the existing API key
+		if apiKey == "" {
+			_, err = s.db.Exec(`
+				UPDATE ai_models SET enabled = ?, custom_api_url = ?, custom_model_name = ?, updated_at = datetime('now')
+				WHERE id = ? AND user_id = ?
+			`, enabled, customAPIURL, customModelName, existingID, userID)
+		} else {
+			encryptedAPIKey := s.encrypt(apiKey)
+			_, err = s.db.Exec(`
+				UPDATE ai_models SET enabled = ?, api_key = ?, custom_api_url = ?, custom_model_name = ?, updated_at = datetime('now')
+				WHERE id = ? AND user_id = ?
+			`, enabled, encryptedAPIKey, customAPIURL, customModelName, existingID, userID)
+		}
 		return err
 	}
 
@@ -222,11 +231,19 @@ func (s *AIModelStore) Update(userID, id string, enabled bool, apiKey, customAPI
 	err = s.db.QueryRow(`SELECT id FROM ai_models WHERE user_id = ? AND provider = ? LIMIT 1`, userID, provider).Scan(&existingID)
 	if err == nil {
 		logger.Warnf("⚠️ Using legacy provider matching to update model: %s -> %s", provider, existingID)
-		encryptedAPIKey := s.encrypt(apiKey)
-		_, err = s.db.Exec(`
-			UPDATE ai_models SET enabled = ?, api_key = ?, custom_api_url = ?, custom_model_name = ?, updated_at = datetime('now')
-			WHERE id = ? AND user_id = ?
-		`, enabled, encryptedAPIKey, customAPIURL, customModelName, existingID, userID)
+		// If apiKey is empty, preserve the existing API key
+		if apiKey == "" {
+			_, err = s.db.Exec(`
+				UPDATE ai_models SET enabled = ?, custom_api_url = ?, custom_model_name = ?, updated_at = datetime('now')
+				WHERE id = ? AND user_id = ?
+			`, enabled, customAPIURL, customModelName, existingID, userID)
+		} else {
+			encryptedAPIKey := s.encrypt(apiKey)
+			_, err = s.db.Exec(`
+				UPDATE ai_models SET enabled = ?, api_key = ?, custom_api_url = ?, custom_model_name = ?, updated_at = datetime('now')
+				WHERE id = ? AND user_id = ?
+			`, enabled, encryptedAPIKey, customAPIURL, customModelName, existingID, userID)
+		}
 		return err
 	}
 
diff --git a/store/strategy.go b/store/strategy.go
index 23432a40..6a58d599 100644
--- a/store/strategy.go
+++ b/store/strategy.go
@@ -191,7 +191,8 @@ func GetDefaultStrategyConfig(lang string) StrategyConfig {
 			CoinPoolLimit:  30,
 			CoinPoolAPIURL: "http://nofxaios.com:30006/api/ai500/list?auth=cm_568c67eae410d912c54c",
 			UseOITop:       false,
-			OITopLimit:     0,
+			OITopLimit:     20,
+			OITopAPIURL:    "http://nofxaios.com:30006/api/oi/top-ranking?limit=20&duration=1h&auth=cm_568c67eae410d912c54c",
 		},
 		Indicators: IndicatorConfig{
 			Klines: KlineConfig{
diff --git a/web/src/components/strategy/CoinSourceEditor.tsx b/web/src/components/strategy/CoinSourceEditor.tsx
index 16117883..b6d046d5 100644
--- a/web/src/components/strategy/CoinSourceEditor.tsx
+++ b/web/src/components/strategy/CoinSourceEditor.tsx
@@ -2,6 +2,10 @@ import { useState } from 'react'
 import { Plus, X, Database, TrendingUp, List, Link, AlertCircle } from 'lucide-react'
 import type { CoinSourceConfig } from '../../types'
 
+// Default API URLs for data sources
+const DEFAULT_COIN_POOL_API_URL = 'http://nofxaios.com:30006/api/ai500/list?auth=cm_568c67eae410d912c54c'
+const DEFAULT_OI_TOP_API_URL = 'http://nofxaios.com:30006/api/oi/top-ranking?limit=20&duration=1h&auth=cm_568c67eae410d912c54c'
+
 interface CoinSourceEditorProps {
   config: CoinSourceConfig
   onChange: (config: CoinSourceConfig) => void
@@ -49,6 +53,7 @@ export function CoinSourceEditor({
       },
       apiUrlRequired: { zh: '需要填写 API URL 才能获取数据', en: 'API URL required to fetch data' },
       dataSourceConfig: { zh: '数据源配置', en: 'Data Source Configuration' },
+      fillDefault: { zh: '填入默认', en: 'Fill Default' },
     }
     return translations[key]?.[language] || key
   }
@@ -228,9 +233,21 @@ export function CoinSourceEditor({
 
           {config.use_coin_pool && (
             <div>
-              <label className="block text-sm mb-2" style={{ color: '#848E9C' }}>
-                {t('coinPoolApiUrl')}
-              </label>
+              <div className="flex items-center justify-between mb-2">
+                <label className="text-sm" style={{ color: '#848E9C' }}>
+                  {t('coinPoolApiUrl')}
+                </label>
+                {!disabled && !config.coin_pool_api_url && (
+                  <button
+                    type="button"
+                    onClick={() => onChange({ ...config, coin_pool_api_url: DEFAULT_COIN_POOL_API_URL })}
+                    className="text-xs px-2 py-1 rounded"
+                    style={{ background: '#F0B90B20', color: '#F0B90B' }}
+                  >
+                    {t('fillDefault')}
+                  </button>
+                )}
+              </div>
               <input
                 type="url"
                 value={config.coin_pool_api_url || ''}
@@ -312,9 +329,21 @@ export function CoinSourceEditor({
 
           {config.use_oi_top && (
             <div>
-              <label className="block text-sm mb-2" style={{ color: '#848E9C' }}>
-                {t('oiTopApiUrl')}
-              </label>
+              <div className="flex items-center justify-between mb-2">
+                <label className="text-sm" style={{ color: '#848E9C' }}>
+                  {t('oiTopApiUrl')}
+                </label>
+                {!disabled && !config.oi_top_api_url && (
+                  <button
+                    type="button"
+                    onClick={() => onChange({ ...config, oi_top_api_url: DEFAULT_OI_TOP_API_URL })}
+                    className="text-xs px-2 py-1 rounded"
+                    style={{ background: '#0ECB8120', color: '#0ECB81' }}
+                  >
+                    {t('fillDefault')}
+                  </button>
+                )}
+              </div>
               <input
                 type="url"
                 value={config.oi_top_api_url || ''}
diff --git a/web/src/components/strategy/IndicatorEditor.tsx b/web/src/components/strategy/IndicatorEditor.tsx
index f7952fae..78080516 100644
--- a/web/src/components/strategy/IndicatorEditor.tsx
+++ b/web/src/components/strategy/IndicatorEditor.tsx
@@ -1,6 +1,9 @@
 import { Clock, Activity, Database } from 'lucide-react'
 import type { IndicatorConfig } from '../../types'
 
+// Default API URL for quant data (must contain {symbol} placeholder)
+const DEFAULT_QUANT_DATA_API_URL = 'http://nofxaios.com:30006/api/coin/{symbol}?include=netflow,oi,price&auth=cm_568c67eae410d912c54c'
+
 interface IndicatorEditorProps {
   config: IndicatorConfig
   onChange: (config: IndicatorConfig) => void
@@ -54,6 +57,7 @@ export function IndicatorEditor({
       quantData: { zh: '量化数据', en: 'Quant Data' },
       quantDataDesc: { zh: '资金流向、持仓变化、价格变化（按币种查询）', en: 'Netflow, OI delta, price change (per coin)' },
       quantDataUrl: { zh: '量化数据 API', en: 'Quant Data API' },
+      fillDefault: { zh: '填入默认', en: 'Fill Default' },
     }
     return translations[key]?.[language] || key
   }
@@ -293,9 +297,21 @@ export function IndicatorEditor({
           {/* API URL */}
           {config.enable_quant_data && (
             <div>
-              <label className="text-[10px] mb-1 block" style={{ color: '#848E9C' }}>
-                {t('quantDataUrl')} <span style={{ color: '#5E6673' }}>({'{symbol}'} = 币种)</span>
-              </label>
+              <div className="flex items-center justify-between mb-1">
+                <label className="text-[10px]" style={{ color: '#848E9C' }}>
+                  {t('quantDataUrl')} <span style={{ color: '#5E6673' }}>({'{symbol}'} = 币种)</span>
+                </label>
+                {!disabled && !config.quant_data_api_url && (
+                  <button
+                    type="button"
+                    onClick={() => onChange({ ...config, quant_data_api_url: DEFAULT_QUANT_DATA_API_URL })}
+                    className="text-[10px] px-2 py-0.5 rounded"
+                    style={{ background: '#22c55e20', color: '#22c55e' }}
+                  >
+                    {t('fillDefault')}
+                  </button>
+                )}
+              </div>
               <input
                 type="text"
                 value={config.quant_data_api_url || ''}