Free to view is not free to display: 6 of 9 markets are red, 2 need a licence, only Taiwan offers an open-data path

Asked (summary):

For the US, China, Hong Kong, Japan, Korea, Taiwan, Canada, Singapore and Europe: which free share-price sources exist, what are their terms for commercial display, rate limits and update frequency, and which are research-only and must never be shown to paying users — with one example source per market.

This compliance screen covers all 9 of 9 requested markets, with one reviewed example free source per market drawn from 13 extracted evidence rows across 11 independent hosts (four Alpha Vantage rows merged into US, one stray TMX quote row merged into Canada). For a paid product the conservative default is: do not display unless the provider expressly grants commercial external-display rights.

Risk matrix: commercial display of free price data, by market

Red — research/internal/personal only; never show to paying users Amber — only after an exchange/vendor licence or written permission Green — allowed under an open-data licence if its conditions, especially attribution, are met

Findings

Alpha Vantage's free US tier is capped at 25 requests/day, and real-time or 15-minute-delayed US exchange data is premium-only — treat the free tier as research/prototyping until display entitlements are confirmed in writing. alphavantage.co

Taiwan is the one possible green path: TWSE open datasets released under the Open Government Data License 1.0 can be reused commercially with attribution — but the separate 5-second/real-time TWSE quote feed stays licensed market data. click.oanor.dev

Korea's KRX Open API is the only reviewed source with a published numeric quota — 10,000 calls/day per key — yet its free terms are personal, non-commercial, with raw redistribution prohibited. api.apify.com

China and Hong Kong free-looking quotes sit behind formal gates: SSE quote products need written approval and licence identification on screen, and HKEX delayed/BMP display runs only through licensed information vendors. sec.gov · hkex.com.hk

Evidence table

Market	Example free source	Commercial display under free terms	Rate limit	Price freshness	Classification	Source

Product-compliance screen, not legal advice. 13 extracted rows normalized to 9 markets (one example source per market); rows span 11 independent hosts and no URL backs more than one row. Reviewed 2024–2025 provider terms, licences and documentation; "No public numeric API limit stated" means the provider publishes no quota, not "unlimited". The Korea 10,000 calls/day quota and some Taiwan implementation details come from secondary implementation documentation and the China row from SSE licensing material archived with the SEC — re-check all three against current official terms before launch.

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