Tic Talk streams real-time SPY (or any US stock) trades from Alpaca's full SIP consolidated WebSocket (Algo Trader Plus). Sign up at alpaca.markets, subscribe to Algo Trader Plus for SIP + options data, grab your API Key ID and Secret from the dashboard, and paste them in CONNECTION above.

Pre-market: enter your levels in the LEVELS & NOTES pad with their abbreviations (PMH, YDO, YDC, PML, VWAP, gamma — whatever you watch). The auctioneer calls every trade as it prints and announces above/below/at any open-cross, level-cross, or whole-dollar strike.

REPLAY lets you practice when the market is closed. Tap it to replay the most recent trading day's real tick data — the same prices, the same auctioneer callouts — running at normal 1× speed. While a replay is playing, the START button becomes PAUSE so you can stop and resume. Replay only works when the market is closed; during regular hours (9:30 AM–4:00 PM ET, Mon–Fri) the button stays visible but is dimmed and disabled, since live data is streaming instead.