IMF Data
International Monetary Fund · Open & public data
The IMF's statistical portal for World Economic Outlook, fiscal, balance-of-payments, reserves and price datasets with SDMX 2.1 and 3.0 APIs
ProprietaryFreeNov 2, 2026
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Massive (formerly Polygon.io)
Massive (Polygon.io, Inc.) · Market & fundamentals data
Market data platform (renamed from Polygon.io in October 2025) with REST and WebSocket APIs, flat files and SQL access for US stocks, options, indices, forex, crypto and futures
ProprietaryPaidEnterpriseNov 2, 2026
Nasdaq Data Link
Nasdaq, Inc. · Market & fundamentals data
Nasdaq's marketplace for financial, economic and alternative datasets (formerly Quandl) with a REST API, time-series and table endpoints and Python, R and Excel clients
ProprietaryFreemiumPaidNov 2, 2026
OpenFIGI
Bloomberg L.P. (FIGI Registration Authority) · Market & fundamentals data
Free API and web tool from Bloomberg for mapping tickers, ISINs, CUSIPs and other identifiers to public-domain FIGI instrument identifiers, with search and filter endpoints
ProprietaryFreeNov 2, 2026
World Bank Open Data
World Bank Group · Open & public data
Free access to World Bank development indicators by country and year through a web portal, bulk downloads and a public REST API
ProprietaryFreeBroken
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