I use Tiingo's API to download EOD prices of a few stocks and ETFs. The free version is limited to 500 unique tickers per month. The adjusted prices are accurate, and the tickers I need have always been available.

csv_format_is_https://api.tiingo.com/tiingo/daily/<ticker>...

"Tiingo's End-of-Day prices use a proprietary error checking framework to help clean data feeds and also help catch missing corportate actions (splits, dividends, and exchange listing changes)... Both raw prices and adjusted prices are available. The adjustment methodology follows the standard method set forth by..."
https://www.tiingo.com/documentation/end-of-day

alphavantage.co and stooq.com also have EOD price data. Intraday price and fundamental data have different sources.

Wisesheets looks interesting. Sounds similar to some other start-ups that are getting the data directly from the annual reports, but coverage might be spotty (some tickers not covered). All the data vendors seem to have some mistakes in their data, and so it's a question of how many mistakes.

Mechanical Investing FAQ

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