How to get current Mastercard rates (buy/sell currency)?

Question

I need to check current Mastercard rates for multiple currencies in my app but I can't found any correct API to do this.

In the same time, large count of sites has regular updates for this rates. Can someone tell me where can I get these rates (buy and sell currency) information?

Answer 1

Just wanted to add to this because it looks like the accepted answer is now out of date.. They appear to have a Currency Conversion Calculator SDK for various languages. Have tried it out, and it appears to do the job!