Fed Treasury vs OpenFIGI

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: *).

OpenFIGI is Bloomberg's free public API for the Financial Instrument Global Identifier (FIGI) standard, mapping third-party symbology (tickers, ISINs, CUSIPs, SEDOLs) to FIGIs across equities, options, futures, and indices, plus full-text search and a bulk spreadsheet-upload tool. A live test of the mapping endpoint returned real data with zero API key supplied, capped at 25 requests per 60 seconds — the entry's stored `API Key` auth is corrected to `None`, since registering for a free key only raises that throughput ceiling rather than gating access. A live Origin-header probe (an OPTIONS preflight and a real POST) found no Access-Control-Allow-Origin header on either response, correcting the stored `cors: yes` to `no`.