Anyone know of a real-time currency rate webservice with frequent update (multiple pr. min.). Needed for a small android app I'm building, so needs to be free.
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You can discover how to implement your own currency rate service with black jack and other stuff ;) (http://developersblog.tk/currency-rate-manager-csh-wcf-wpf-mvvm/) – Nov 13 '13 at 11:23
6 Answers
I would recommend European Central Bank. They provide a daily xml feed, nice and simple.

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You can try Yahoo. It is free and easy to use.
For example, to convert from GBP to EUR: http://download.finance.yahoo.com/d/quotes.csv?s=GBPEUR=X&f=sl1d1t1ba&e=.csv
gives you data in csv format which can easily be parsed.

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1This is not really free. [Read Robyns post](http://developer.yahoo.com/forum/General-Discussion-at-YDN/Using-Yahoo-Finance-API-Not-RSS-/1250246255000-0b82f8f0-7f48-3af2-8fe2-e73a138cbfaa) – cocoafan Mar 28 '12 at 22:21
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@cocoafan : The link you have provide is not working i want to know why it is not free and how ? – Purushottam Sain Apr 26 '17 at 08:29
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Have you tried with http://openexchangerates.org ?
You can use it's The Forever Free Plan with following features provided.
Hourly rate updates
Daily historical data
1,000 API requests per month
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13Yes its free. They offer three options plus: We also have a Forever Free plan (hourly updates, 1000 requests/month - no HTTPS, email support or advanced features) – Dan Cook Jul 21 '14 at 15:54
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it has free plan which is very limited. For example, you can't change base currency and it always stays USD. Also you can't use other APIs like timeseries etc. But for simple purposes it works. – walv Nov 25 '17 at 05:49
I would suggest Mondor's web service, especially the WebAPI one. Not free, but could be about 5$ per year, depending from your architecture. Anyway, here's the link: http://mondor.org
Edit: apparently, they have free keys now, or I missed them previously.

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Real time financial services are usually not available for free. You will find a lot of delayed services ( tipically 15 min ) for free, but you have to make sure licensing allow you to use it in your own application as well.

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I'll check up on licensing. However this is just an app for learning purposes. – jaspernygaard Feb 02 '11 at 11:58
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you have some webs where you can take this information. The problem... usually you need pay for this service. Same examples :

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