Finnhub
Finnhub is a financial market data API providing real-time and historical stock quotes, company fundamentals, earnings data, and alternative datasets (insider transactions, social sentiment, ESG scores) across global exchanges. It notably includes coverage of the Nigerian Exchange (NGX) alongside major US, European, and Asian markets, making it one of the few widely-used international market data providers with any direct Nigerian equities coverage.
The core REST API exposes endpoints for real-time quotes, historical OHLCV candles, company profiles, financial statements (income statement, balance sheet, cash flow), analyst estimates, and earnings calendars. A WebSocket feed streams live trade-level price updates for supported exchanges, useful for building live tickers or algorithmic trading signals. Authentication uses a simple API key passed as a query parameter or header.
The free tier allows 60 API calls per minute with access to a meaningful subset of endpoints (real-time US quotes, basic fundamentals), which is enough for prototyping a portfolio tracker or market dashboard. Paid plans unlock full historical depth, additional exchanges including NGX, and higher rate limits. For Nigerian fintech and investment platforms building portfolio trackers, robo-advisors, or market research tools, Finnhub is a practical way to get both global and NGX-adjacent market data from a single integration rather than stitching together multiple region-specific providers.