data-source-switch

name	data-source-switch
description	Guide for switching between yfinance, yahooquery, and FMP data sources
license	MIT

Data Source Switch

Available sources

Source	Flag	Best for	Limitations
yfinance	--data-source yfinance (default)	Universal, ETFs, backtest	Slower for large universes, rate limits
yahooquery	--data-source yahooquery	Large stock universes, speed	No backtest, no ETFs
FMP	--data-source fmp	When yfinance fails / rate-limited	Requires FMP_API_KEY, 250 req/day, no ETFs

Key differences

yahooquery

• Batch fetches in chunks of 10, 5 parallel workers
• Automatic per-ticker fallback to yfinance on failure
• Does not support backtest or ETFs

FMP

• 4 API calls per ticker (profile, ratios-ttm, historical-price-eod, earnings-surprises)
• Free tier: 250 requests/day ≈ 60 tickers
• Pre-flight rate-limit check, auto-fallback on HTTP 429
• Does not support backtest or ETFs

Switching

CLI

investdaytip -n 5 -r us --data-source yahooquery
investdaytip -n 5 -r us --data-source fmp
investdaytip advisor --data-source yahooquery
investdaytip backtest -n 5 -r us   # always yfinance

Programmatic API

get_recommendations(top_n=5, region="us", data_source="yahooquery")

Common issues

Issue	Source	Fix
Rate limited	yfinance	Wait 1-2 min, or switch to yahooquery/FMP
Missing FMP_API_KEY	FMP	export FMP_API_KEY=your_key
Batch fails entirely	yahooquery	Falls back to yfinance automatically
ETFs not supported	yahooquery/FMP	Use --data-source yfinance for ETFs