Alpaca vs Fed Treasury

Alpaca's Market Data API v2 delivers realtime and historical quotes, trades, and bars for US equities and ETFs over REST and WebSocket, requiring an Alpaca brokerage/API-key account. The free plan gives 200 API calls/minute with 15-minute-delayed IEX-exchange data and 30-symbol WebSocket streams; the $99/month Algo Trader Plus tier removes the call cap, adds true realtime data from all US exchanges (plus real-time OPRA options quotes), and unlimited streamed symbols. Both tiers include 7+ years of historical data.

Fiscal Data is the U.S. Department of the Treasury's open REST API for federal financial datasets — debt, revenue, spending, interest rates, and savings bonds — maintained by the Bureau of the Fiscal Service. Every endpoint supports field selection, filtering, sorting, and pagination, and returns JSON by default with CSV or XML available via the format parameter. No registration or API key is required, and a live Origin-header probe confirmed CORS is enabled (Access-Control-Allow-Origin: *).