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】
> search(help me translate How to Convert 900 INR to USD: Current Exchange Rates and Step-by-Step Calculation to Chinese)如何将 900 印度卢比兑换成美元:当前汇率和逐步计算方法【900 inr to usd】