Many Amex Serve accounts received targeted emails offering a $50 statement credit for 2 direct deposits of $250 or more completed by 6/30/14.
Of the 3 accounts in our family, only one received the targeted email, however I tried all 3 using withdrawals from Amazon Payments which are counted as direct deposits.
I am happy to report all 3 received the $50 credit within a day of completion of the direct deposits.
These were all accounts opened within the past few months that had not previously received such an offer or statement credit. It is conceivable that older accounts may have had a similar promotion and not be eligible for a repeat.
There is no need to opt in for offer, only to have the direct deposits, so it is worth trying for any Serve account.