See the value of a Bitcoin according to different sources with a simple JSON API.
All major currencies are supported (USD, EUR, GBP, CAD, JPY, CNY etc.)
GET /price/:currencyto get the plain text conversion for a currency
GET /all/:currencyto get all the conversion rates in all sources for a currency
GET /:ticker/:currencyto get the conversion rates in a source (see next section for available providers) for a currency
GET /average/:currencyto get an average price based on all the providers for a currency
GET /charts/:typeto get the data that fills the charts here (types are
GET /ltc/:currencyto convert an amount of LTC to a currency
GET /convert/:amount/:currencyto convert an amount of BTC to a currency (conversion done with the average price)
Also don't forget to check out the code on GitHub.