You can translate it as: **今日汇率:900日元兑美元**
If you want to be extra precise and keep the today emphasis, you could also write:
**当前汇率(今日):900日元兑美元**【900 japanese yen to usd】
How to Convert Japanese Yen (JPY) to US Dollars (USD): Answering 30 Key Questions, Including Conversion Rates and 900 JPY to USD Today【900 japanese yen to usd】