What sources of financial and economic data are available online? Which ones are free or cheap? What has your experience been like with these data sources?

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    $\begingroup$ Anybody have a link to (downloadable) (historic) CDS data? $\endgroup$
    – Samo
    Commented Aug 21, 2011 at 10:25
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    $\begingroup$ Where could I download data for Advance-Decline-Unchanged issues for NYSE, AMEX and NASDAQ as far back in history as possible (NYSE data starts in March 1965, AMEX data starts in February 2002, NASDAQ data starts in January 1978.) The best resource for download I was able to find until now is unicorn.us.com/advdec which is really great. Unfortunately with data only from 2002. I am looking for NYSE Up/Dn Issues and volume since 1965. Thanks for any hints where to get this. $\endgroup$
    – user1392
    Commented Sep 16, 2011 at 9:53
  • $\begingroup$ Does anyone have any experience with OptionData service? $\endgroup$
    – Timka
    Commented Oct 31, 2013 at 1:20
  • $\begingroup$ user1392. Our NYSE Advance/Decline data goes back to 1931. It is available in the US stocks historical data package. premiumdata.net/products/premiumdata/uslayout.php Disclosure: I am a co-owner of Premium Data. $\endgroup$ Commented Apr 25, 2015 at 2:53
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    $\begingroup$ opendata.stackexchange.com is a good place to ask for open data sets. $\endgroup$ Commented Aug 24, 2015 at 1:44

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