Sure!

So you can check the price feed on peakmonsters at the top of the market page:

The $0.000762 means that the game is valuing 1 DEC as 0.000762 US dollars. Said the other way, 1 USD is worth 1312 DEC.

With that, we can do a little math and come out here:

So let's say you have a Battle Orca

The asking price is 0.049, but it looks like it's actually selling at 0.020. This reward card follows the Untamed burn rates, so it's burn value 0.0305. If you want to wait however long and sell at 0.049 (61 DEC after fees), maybe that will work out. But if you want to sell quickly, it's better to send to @dec101 and get 41.6 DEC. And that's way better than selling for 0.020 (25 DEC after fees).