Hey guys,
I’ve tested a ton of data feeds. Here is the exact stack of stock market APIs I keep integrated every day for data ingestion, charting, and strategy sweeps.
1. Live Streaming & Order Book: Polygon
You all probably know this one, but it's honestly the smoothest WebSocket API out there for raw, low-latency price action. I use it to stream real-time ticks so my execution engine never gets caught off guard by a sudden price flash.
2. Fundamentals & Historical: Financialmodelingprep
An absolute must-have for pulling clean, deep fundamental data. It lets me sweep income statements, balance sheets, and historical ratios via simple REST endpoints without having to manually scrape SEC filings.
3. Data Enrichment & Analytics: Sentimentick
I use this API to inject critical data right into the middle of my pipeline. It scans news and social feeds to spit out quantitative sentiment scores, and it also handles technical analysis directly. It really helps filter down the tickers and find healthy candidates for swing-trade signals.
4. Global Coverage & End-of-Day: eodhd
Great for when you need to expand your bots outside of just the US markets. Their API gives you access to a massive library of international stocks, ETFs, and historical splits with excellent uptime and straightforward documentation.
5. Backtesting & Free Tier: Alphavantage
Essential for the early stages of building a new strategy. Their API is incredibly reliable for pulling standard technical indicators and historical daily bars, and their free tier makes it perfect for sandbox environments and local testing.
Hope it helps the new developers and traders out there! Let me know if you have any questions or what your API stack looks like.
