News for hackers. Stuff that matters.
Re:Styvio API: unlimited intraday stock market data in JSON by clipradiowallet on Thursday July 08, 2021 @03:33PM (#27776648)
Since their website doesn't say which exchange they offer data from... let me chime in after signing up and looking. You get:

NYSE and NASDAQ exchanges, with some mixed crypto-related instruments as well.

tldr; no CME/CBOT/CBOE/etc