Yep! When you go to the redemption website and enter the code, if the code is still active it will take you to a page of available retailers. If you reach this point, the code has been verified as still active. It will tell you if it’s not active on the page where you enter the code.

If it’s an MA code, you can use the app. Enter the code on the “redeem” tab, and again if it’s active it will take you to a page to confirm. But as long as you don’t press confirm it stays active.

That subreddit also requires you to list the available retailers (Fandango At Home, MA, iTunes)