Can a rate tool predict where the yen is going?

No, a rate tool cannot predict where the yen is going, and nobody can reliably forecast exchange rates. A converter shows current reference rates and a recent trend, which gives context but not direction. Some bank and card apps can send alerts when a level is reached, but an alert only reports that a level was reached; this site does not send alerts. Be cautious of any site or post that claims to know the best time to exchange money or promises secret rates.¹