▶️ Kripto Detayini Acttim BTC

1. URL: /kripto/BTC (Coin URL: KOD, NOT BTCUSDT)
2. GET /api/stocks/kripto/BTC
3. Binance WS direct connect: wss://stream.binance.com:9443
4. Subscribe: btcusdt@trade
5. Real-time tick: her saniye fiyat update
6. USD/TRY toggle: frontend cevirir (45.7132 carpani)

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