IG vs OpenFIGI

IG's trading API layers REST order execution and Lightstreamer-based streaming onto the same CFD, spread-betting, and forex engine behind IG's own platform, authenticated with an API key generated from a live account (a linked demo account then lets you sandbox trades risk-free). There's no separate API fee — access is included with any account and gated only by IG's standard per-key usage quotas, not a metered price. A live probe of the real API host (api.ig.com) returned `Access-Control-Allow-Origin: *` even on an error response, confirming CORS is open — correcting the previously-recorded `unknown`.

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`.