Free and public channels for market data

Core market information isn't locked behind expensive terminals. Accept the delayed/daily constraint, and an individual can work with a surprising amount of data for free.

Korea

• Korea's public data portal (FSC) stock quotes — open/close/volume (D+1).
• KRX Information Data System — indices, tickers, stats.
• DART (FSS) — filings and financial statements.
• Bank of Korea ECOS — policy rate and FX.

Global

• yfinance (Yahoo-based) — global indices/tickers (unofficial, mind the terms).
• Stooq — daily CSV of global indices and FX.
• FRED · SEC EDGAR — US macro and filings (free, official).

Unofficial/free sources may restrict commercial redistribution. Use your own processed summaries rather than raw redistribution, and always cite the source.