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 SDKs from our SDK directory that matched your search term. Though your definition of an SDK may differ, in our world, we define SDKs as platform- specific tools for consuming existing APIs of the sort we list in our API directory. For example, the Ruby SDK for consuming the Twitter Ads API. If you think an SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.