Binance permanently decommissioned wss://fstream.binance.com/stream on
2026-04-23. Connections to the legacy URL still complete the handshake
but receive no kline data — the server silently withholds frames and
read.next() blocks forever, so realtime updates stop while historical
REST sync still works. This caused frontend charts to freeze and
watchlist prices to remain at 0.00.
Per Binance's WebSocket Change Notice, kline streams now belong to the
/market routing class. Updating the combined-stream URL to
wss://fstream.binance.com/market/stream?streams=... restores realtime
delivery without any other code change (combined-stream syntax is
unchanged).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
0xcathiefish