yfinance

Free Python wrapper around Yahoo Finance public endpoints. De-facto standard for HK and US equities when you don’t want to pay for a data API.

Why It Matters

• No API key needed
• Solid coverage for HK + US equities, indices, and ETFs
• Used by vibe-trading as the HK/US default and benchmark resolver (SPY, CSI 300, etc. for benchmark comparison panels)

Caveats

• Yahoo’s endpoints are unofficial — break occasionally and silently.
• Historical depth varies by symbol; intraday is limited.
• Not appropriate for production trading systems where uptime matters.

Related

• AKShare — A-share-first counterpart, also covers HK/US
• CCXT — crypto equivalent
• vibe-trading — usage in a multi-agent finance stack