MoneyCSV
Personal finance program based on CSV text files (no closed database)
...The intro level API key is free, and you get 500 downloads per month of all your stocks, which is plenty of downloads as one typically just updates once a day. The main advantage of this Money CSV is that all account transactions are stored in CSV text files rather than a hidden database format. This means that your financial data is always stored locally (or on your own cloud) and your financial data is always accessible as the data is stored in human readable text files.