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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Not the best but still something: https://github.com/BenTimor/Trading212API
https://github.com/ahmedsakr/wstrade-api, https://github.com/seansullivan44/Wealthsimple-Trade-Python, https://github.com/yusuf8ahmed/Wsimple. Disclaimer: I've not used any of these APIs, but quick skimming around I found that all of them are kind of valid. Use at your own risk!
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.