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    "# 02 — Streaming de Datos en Tiempo Real (Binance WebSocket)\n",
    "\n",
    "Binance ofrece WebSocket streams push-based para datos de mercado en tiempo real.\n",
    "\n",
    "**Base URLs:**\n",
    "- Produccion: `wss://stream.binance.com:9443/ws/<stream>`\n",
    "- Testnet: `wss://testnet.binance.vision/ws/<stream>`\n",
    "- Multi-stream: `wss://stream.binance.com:9443/stream?streams=<s1>/<s2>`\n",
    "\n",
    "**Streams principales:**\n",
    "| Stream | Nombre | Frecuencia |\n",
    "|---|---|---|\n",
    "| Trades individuales | `<symbol>@trade` | Cada trade |\n",
    "| Klines en vivo | `<symbol>@kline_<interval>` | Cada cambio en vela |\n",
    "| Mini ticker 24h | `<symbol>@miniTicker` | ~1s |\n",
    "| Book ticker (best bid/ask) | `<symbol>@bookTicker` | Cada cambio |\n",
    "| Todos los tickers | `!miniTicker@arr` | ~1s |\n",
    "\n",
    "**Reglas de conexion:**\n",
    "- Ping cada 3 min desde Binance, pong requerido\n",
    "- Desconexion automatica a las 24h — reconectar periodicamente\n",
    "- Se puede suscribir/desuscribir dinamicamente via JSON"
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    "import asyncio\n",
    "import json\n",
    "import websockets\n",
    "import pandas as pd\n",
    "from datetime import datetime, timezone\n",
    "from collections import deque\n",
    "\n",
    "WS_BASE = \"wss://stream.binance.com:9443/ws\""
   ]
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   "source": [
    "## Stream de Trades individuales\n",
    "\n",
    "`<symbol>@trade` — recibe cada trade ejecutado en tiempo real.\n",
    "\n",
    "Campos clave:\n",
    "- `p` = precio, `q` = cantidad\n",
    "- `m` = true si el buyer es maker (es decir, fue un sell market order que impacto un bid)\n",
    "- `t` = trade ID, `T` = timestamp"
   ]
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   "id": "aaed9f77",
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    "async def stream_trades(symbol: str, max_trades: int = 100) -> list[dict]:\n",
    "    \"\"\"Captura N trades en tiempo real y retorna como lista.\"\"\"\n",
    "    url = f\"{WS_BASE}/{symbol.lower()}@trade\"\n",
    "    trades = []\n",
    "\n",
    "    async with websockets.connect(url) as ws:\n",
    "        while len(trades) < max_trades:\n",
    "            msg = json.loads(await ws.recv())\n",
    "            trades.append({\n",
    "                \"trade_id\": msg[\"t\"],\n",
    "                \"time\": datetime.fromtimestamp(msg[\"T\"] / 1000, tz=timezone.utc),\n",
    "                \"price\": float(msg[\"p\"]),\n",
    "                \"qty\": float(msg[\"q\"]),\n",
    "                \"is_buyer_maker\": msg[\"m\"],\n",
    "                \"side\": \"SELL\" if msg[\"m\"] else \"BUY\",\n",
    "            })\n",
    "\n",
    "    return trades"
   ]
  }
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