What's the foremost authority for realtime ForEx rates?
it's like asking what's the world price for a tuna sandwich, there's a few million places you could buy one, and they all have a different price
I transfer my entire salary from USD to EUR every year so I definitely want to get the best rate.
I am a very happy Transferwise user. I used to always check the exchange rate on xe.com, then switch to Transferwise to compare before transferring. Now I don't bother, because Transferwise has always been very close to the spot rate.