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The undocumented Google finance API was also turned off this month after many years.

There's a severe dearth of good, free, market data API's.

If both shut down within a short period of time it's probably due to the vendor. I'd guess one of the major exchanges in the US has changed the terms of the license or started enforcing it. They make money with this data so it's understandable that they don't like free APIs.

Likely the NYSE, they've decided to make some money off of algorithmic trading by charging a non-display fee, where it costs thousands of dollars per month to use stock quotes for anything other than displaying to a human, and have been on a warpath enforcing it, causing a large fight between the NYSE and Bloomberg, Citadel, etc. with lots of lawyers and government regulators involved.

I can't imagine they're happy about people possibly using Google or Yahoo Finance APIs for similar purposes either (since most of the uses of market data APIs are probably for non-display use).

http://www.businessinsider.com/bloomberg-letter-targets-nyse...

https://www.nyse.com/publicdocs/nyse/data/Policy-NonDisplay_...

https://www.quandl.com/search

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