Comment by raj_96

At a quick glance, I found these:

Forex: - fxempire.com - alphavantage.co

Crypto: - polygon.io - Script for Binance and Coinbase for putting orders I presume

Fixed income: - ecb.europa.eu

Alternative: - hacker-news.firebaseio.com

Macro: - api.nasdaq.com - econdb.com - fred.stlouisfed.org