Most backtesting tools limit you to 1m candles. Market5s bridges the gap with professional 5s OHLCV datasets. What stands out: 5s Granularity: 12x more precise than standard data. KlineBuilder Engine: Ensures 100% gap-free, continuous CSV files. Zero Friction: No scraping or API cleaning. Ready for Python/C#. Accessible: Institutional frequency for independent devs. The missing link for quants who need precision without the infrastructure headache.