fix: improve XAU price fallback with multiple symbol attempts

agents/xau_brief.py

@@ -43,11 +43,14 @@ class XAUBriefAgent:
         return self._get_gold_fallback()
 
     def _get_gold_fallback(self):
-        """Fallback: dados da Binance (XAU/USDT)."""
+        """Fallback: dados da Binance via par alternativo (GOLD/USDT)."""
         result = {}
+        # Tenta XAU/BRL ou XAU/USDT na Binance
+        symbols = ["XAUUSDT", "GLDUSDT", "PAXGUSDT"]
+        for sym in symbols:
             try:
                 r = requests.get(
-                "https://api.binance.com/api/v3/ticker/24hr?symbol=XAUUSDT",
+                    f"https://api.binance.com/api/v3/ticker/24hr?symbol={sym}",
                     timeout=8
                 )
                 if r.status_code == 200:
@@ -57,11 +60,13 @@ class XAUBriefAgent:
                     result["high"] = float(data.get("highPrice", 0))
                     result["low"] = float(data.get("lowPrice", 0))
                     result["volume"] = float(data.get("quoteVolume", 0))
+                    if result["xau_usd"] > 100:  # preço válido de ouro
+                        break
             except:
-            pass
+                continue
 
         # Segundo fallback: exchangerate
-        if not result.get("xau_usd"):
+        if not result.get("xau_usd") or result["xau_usd"] < 100:
             try:
                 r = requests.get(
                     "https://api.exchangerate-api.com/v4/latest/XAU",
@@ -74,6 +79,21 @@ class XAUBriefAgent:
             except:
                 pass
 
+        # Terceiro fallback: Metal-price.org API pública
+        if not result.get("xau_usd") or result["xau_usd"] < 100:
+            try:
+                r = requests.get(
+                    "https://api.metals.live/v1/spot/gold",
+                    timeout=8
+                )
+                if r.status_code == 200:
+                    data = r.json()
+                    if isinstance(data, list) and len(data) > 0:
+                        result["xau_usd"] = data[0].get("gold", 0)
+                        result["chp"] = 0
+            except:
+                pass
+
         return result
 
     # ── Treasury Yields (US 10Y) ───────────────────────────────────────────────