Tag: yfinance
-
yfinance to Polygon.io: 4 Breaking Changes in Migration
yfinance to Polygon.io migration breaks in 4 hidden ways: timezone handling, adjusted close formulas, rate limits, and missing bars. Real fixes.
-
yfinance Alternatives 2026: 7 Free APIs Compared
Tested 7 free stock APIs at 5-second intervals during market open. yfinance handled 360 requests; Alpha Vantage died at 5. Real latency and quota numbers.
-
Free vs Paid Stock APIs: Real Cost at 10K-1M Requests
Compare free vs paid stock APIs and discover hidden costs at scale. Find the best provider for 10K-1M requests with real pricing breakdown.
-
Alpha Vantage to yfinance Migration: 3 Breaking Changes
Alpha Vantage to yfinance migration breaks position sizing in 3 subtle ways. Timezone drift, NaN handling, and adjusted close differences explained.
-
yfinance vs Alpha Vantage vs Polygon: Real Cost Per 1M Calls
yfinance is free but breaks twice a year. Alpha Vantage costs $1,389 per million calls. Polygon offers $0-$299 tiers that actually scale. Real numbers.
-
Stock Data API Debugging: 5 Silent Failures You’ll Hit
Stock APIs return 200 OK with corrupt data. Detect split adjustments, survivorship bias, and timezone drift before they ruin your backtest.
-
yfinance vs pandas-datareader: Python Stock Data in 2026
yfinance failed to get ticker? pandas-datareader returning errors? We benchmark speed, reliability, and data quality โ one library was 3x faster for stock price analysis in Python.
-
Data Collection and Preprocessing for Quant Trading in Python
Stock split adjustments, survivorship bias, and timestamp alignment pitfalls that corrupt your trading data โ with yfinance and Parquet fixes.