From their site: Currency Rates for 115 major currencies. You can perform interactive foreign exchange rate calculations, using current currency rates updated every 10 minutes (20 minute delay). Simply enter the currency you wish to convert and invoke the Web service. The rate returned will be based on a fraction of the US dollar (USD).
The following is a list of libraries from ProgrammableWeb's Library Directory that matched your search term. Although there many different interpretations of the word "library" among software developers, ProgrammableWeb adheres to a specific definition so as to clearly distinguish libraries from SDKs and frameworks in a way that will facilitate clean search results. In ProgrammableWeb's parlance, the term "library" is strictly used to describe a platform-specific software tool that, when installed, results in the provisioning a specific API. Conversely, SDKs are exclusively for consuming APIs and Frameworks are agnostic to specific APIs. If you think a library, SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.