What the APIs are for
History. Daily and intraday candles so the desk can score a name before it ever clicks buy.
Quotes & tape. Rest snapshots plus a live stream so last, bid, and ask are not a screenshot from yesterday.
Orders. When you enable live trading, buys, sells, protective stops, and profit targets are sent to Tradier on your account. Unchecked, fills stay on the local paper book.
Fortress Prime uses production keys, not sandbox. Paste the token once on the Connection tab.