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However, the Van Dorn Street Station accepts only SmarTrip® cards as payment for all-day parking. There are metered spaces that accept coins and dollar bills, but the all day parking may only be paid for with a SmarTrip® card.
If you travel to Alexandria and use this station, it is worth it to purchase a card since it saves money on every trip on the Metro. Here is the site: http://www.wmata.com/fares/smartrip/ or you can purchase a card at any Metro station.
I'm sure that isn't what you want to hear, but the all-day parking site accepts SmarTrip® as the only form of payment.
All the best,