Styvio API: unlimited intraday stock market data in JSON Posted by ThePlugJumbo on Thursday July 08, 2021 @03:15PM from the styvio.com dept. https://www.styvio.com ( 1 comment | 2 points | on HN )
NYSE and NASDAQ exchanges, with some mixed crypto-related instruments as well.
tldr; no CME/CBOT/CBOE/etc