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E.g., if I wanted to create a cron script that would grab the latest spot price every hour and store it in a local file or database, what would be the place to "scrape" that information from?
(Actually writing the script is not the problem, in my case.)
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There are probably dozens of sites that now provide this data, but the CoinDesk API is one option.
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You could use the JSON encoded ticker data available from MtGox at: https://mtgox.com/api/0/data/ticker.php
Just use whatever your language's equivalent to cURL or wGet is and parse as appropriate.
Unsurprisingly (to anyone familiar with the now-infamous Mt Gox saga), this method will no longer work. – Chris W. – 2017-12-23T01:15:01.470
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You could try using www.btcrate.com as well, which supports additional currencies (should you need them).
FYI, I ended up using the API of BitcoinCharts.com to do this. The Mt Gox API may have worked just as well in my case, but for whatever reason, I was having an issue with my (Python) script that attempted to poll mtgox.com -- it would hang upon making the HTTPS request.
– Chris W. – 2011-10-31T14:18:55.220