json - How to get current Mastercard rates (buy/sell currency)? - Stack Overflow
Visa vs Mastercard for 0% foreign transaction fee conversion rates?
When you use the card abroad, which exchange rate is used? Your bank or Visa/MC/Amex, etc?
AmEX Vs MasterCard foreign transaction rate
Just wanted to add to this because it looks like the accepted answer is now out of date..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!
2022 Update
Mastercard's public APIs do not include one for currency exchange rates, but they do have a Currency Conversion Tool:
Source: MasterCard API showcase forum answer by Brett Thomson.
Now that Fidelity Visa Sig has no foreign transaction fee, I am wondering how Visa vs Mastercard stackup for the conversion rate that they give you when the card is 0% FTF.
On Quicksilver (MC) the currency conversion rate I get is extremely close to the real time quote I see on xe.com. It's 1.5% cashback vs Fidelity Visa Sig's 2% cashback. I buy a good amount online from Japan and hence I was wondering if Visa has a similarly favorable real time foreign transaction conversion amount to USD or if it's worse than MC.