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docs/data-sources.md

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+# Core Data
+
+### EOD (Good Price Good Api)
+- Pricing: https://eodhd.com/pricing
+- API Docs: https://eodhd.com/financial-apis/
+
+### Twelve Data (Promicing $80-230/month)
+- Pricing: https://twelvedata.com/pricing
+- API Docs: https://twelvedata.com/docs
+
+### Tiingo ($30/month looks good)
+- Pricing: https://www.tiingo.com/about/pricing
+- API Docs: https://api.tiingo.com/
+
+### Alpha Vantage (Kinda ok)
+- Pricing: https://www.alphavantage.co/premium/
+- API Docs: https://www.alphavantage.co/documentation/
+
+### Yahoo Finance API
+- Unofficial Python library: https://github.com/ranaroussi/yfinance
+- Alternative: https://github.com/lukaszbanasiak/yahoo-finance
+
+### Finnhub (Expensive $40-200/month)
+- Pricing: https://finnhub.io/pricing
+- API Docs: https://finnhub.io/docs/api
+
+### Polygon.io (Good pricing for 5 years - 20+ is 200 but unlimited calls and good data)
+- Pricing: https://polygon.io/pricing
+- API Docs: https://polygon.io/docs/stocks/getting-started
+
+### FMP ($50/month Lots of data and good api calls)
+- Pricing: https://site.financialmodelingprep.com/developer/docs/pricing
+- API Docs: https://financialmodelingprep.com/developer/docs
+
+
+## Additional Resources
+- **Marketstack**: https://marketstack.com/
+- **Alpaca**: https://alpaca.markets/ - Future hopefully or US connection