Hey awardtrail readers, quick heads-up! If you've got either the Amex Platinum or the Amex Gold card, you're basically sitting on free money each month in the form of Uber Cash. Seriously, are you using it?

The Amex Platinum gives you even more Uber Cash than the Gold, especially in December – think holiday travel! Plus, Platinum cardholders can snag a complimentary Uber One membership, which unlocks even more savings on rides and eats.

Now, the Uber Cash benefit does expire monthly, so this isn't something you can hoard. But it’s incredibly easy to use for rides, Uber Eats deliveries, or even just grabbing a coffee. Basically, make sure you're linking your Amex card to your Uber account and actually using that monthly credit. It’s free value you don't want to leave on the table!